Saturday, January 31, 2015

What sort of future is Benjamin Barber predicting in his short piece "Jihad vs. McWorld"?

As evidenced by the title of his March 1992 Atlantic article, “Jihad vs. McWorld,” Benjamin R. Barber begins by charting two contradictory and simultaneous tendencies of neoliberal capitalism.  On the one hand, economic and technological advancements are ushering in a new era of globalization.  The obvious reference to the fast food chain McDonald’s in his neologism “McWorld” demonstrates the corporate, economic dimension of this globalizing impulse which “universaliz[es] markets” and “make[s] national borders porous from without.”  On the other hand, a countermovement comes in the form of an increased emphasis on the local and the ethnic, here embodied in the Islamic theologem of “Jihad” or holy war.  This localism resists the homogenizing forces of globalization through “re-creating ancient subnational and ethnic borders.”  According to Barber, these two simultaneous movements spell doom for Western political ideals:



They have one thing in common: neither offers much hope to citizens looking for practical ways to govern themselves democratically. If the global future is to pit Jihad's centrifugal whirlwind against McWorld's centripetal black hole, the outcome is unlikely to be democratic....



The push and pull of the "centrifugal" Jihad and "centripetal" McWorld each work against the Enlightenment project of democracy.  The former because of its indifference to such a politics and the latter through an outright hostility towards it, according to Barber's argument.


While both trends fail to deliver on Enlightenment political promises, they do offer virtues of their own.  As Barber puts it:



These rather melodramatic tableaux vivants do not tell the whole story, however. For all their defects, Jihad and McWorld have their attractions. Yet, to repeat and insist, the attractions are unrelated to democracy. Neither McWorld nor Jihad is remotely democratic in impulse. Neither needs democracy; neither promotes democracy.



While, as "repeat[ed] and insist[ed]," neither is democratic, McWorld's globalization "delivers peace, prosperity, and relative unity," while Jihad (though denigrated almost universally in the West) promises "a vibrant local identity, a sense of community, solidarity among kinsmen, neighbors, and countrymen, narrowly conceived."  Barber's phrase "narrowly conceived" both highlights the cosmopolitan impulse of McWorld and his pejorative attitude toward Jihad.


Ultimately, both unrestrained global capitalism and local fanaticism fail to offer virtues that support and foster democratic governance. Barber's solution and vision for the future depends on transcending the ideal of the nation state against which both of these forces react.  At the essay's conclusion, he envisions confederations that will serve to fuse the local and the global:



It certainly seems possible that the most attractive democratic ideal in the face of the brutal realities of Jihad and the dull realities of McWorld will be a confederal union of semi-autonomous communities smaller than nation-states, tied together into regional economic associations and markets larger than nation-states—participatory and self-determining in local matters at the bottom, representative and accountable at the top.



These "confederal union[s]" would be able to manage both the "local matters" of Jihad and the "economic associations" of McWorld in a peaceful and democratic manner, as his reference to "self-determin[ation]" makes abundantly clear.  However, he is quick to note, "[t]his vision reflects only an ideal," ensuring the reader that democracy is a continuous project that must consistently fight against the McWorld-Jihad antagonism.

Friday, January 30, 2015

How does Sylvia Townsend Warner make the ending so effective for you in "The Phoenix"?

Sylvia Townsend Warner makes her ending of “The Phoenix” effective through the use of situational irony.  Situational irony, of course, is when something happens that is not expected.  Much of this irony has to do with Mr. Poldero in “The Phoenix.”  Mr. Tancred Poldero has only one desire:  to make lots of money.  He doesn’t care for the phoenix’s well being at all and simply desires to exploit the innocent for cash.  The irony is that it is Mr. Tancred Poldero’s greed that destroys him at the end of “The Phoenix.”  Throughout the entire story, Mr. Tancred Poldero abuses the phoenix.  Luckily, the phoenix survives due to its rebirth in the flames.  Sylvia Townsend Warner also presents a secondary irony that has to do with the audience.  The audience wants only to be entertained and enthralled.  This also leads to its fiery “death,” which is quite unexpected.  The phoenix, of course, is reborn through those same flames.

How do I find the force that the projectile is implied with?

By definition, projectile motion is the motion under the influence of only one force--gravity. In other words, only one force acts on a body that is undergoing projectile motion and it is the gravity. Thus, if we were to draw a free-body diagram of a body undergoing projectile motion, only one force will be drawn on it and it will have a downward direction (since gravity acts downwards and is the pull of the planet Earth on the body). Note that the body may be traveling in the upwards direction or downwards direction, the only force will still be gravity.


Projectile motion is a motion in 2-dimensions, x and y. Thus, a baseball thrown by a pitcher or hit by the hitter undergoes projectile motion. Similarly, projectile motion can be observed in basketball. A bullet fired from a gun, also undergoes projectile motion.

Thursday, January 29, 2015

Who is the protagonist in In the Castle of My Skin by George Lamming?

Because George Lamming's novel In the Castle of My Skin is autobiographical in nature, the protagonist is G., a boy very similar to the author himself as a child. We should be careful to consider G. as at least a partially fictional creation, though, and not necessarily a faithful representation of George Lamming himself, since the novel is not considered a true autobiography.


As you read Chapter 1, you don't yet know the protagonist's name, but you know that he's narrating the story and that he's just turned nine years old. By Chapter 2, as G. is talking with his mother and his neighbors, you realize they call him "G." This name will stick with him all throughout the novel. (You might be tempted to call him George, but again, we need to acknowledge that the author and the protagonist have separate identities.)


Although the narration makes dramatic shifts to focus on other characters and images, veering away from the first-person point of view provided by G., he remains the novel's most important character and the vehicle through which the larger story of the changing community of the Caribbean village is told.


Some readers might even argue that the entire village itself is the real protagonist. You can certainly make a case for that by citing how often the narration focuses on other members of the community.

If you were at the party hosted by the banker, what arguments would you have put forward? Why?

What is important for you to do with this question is to state your opinion and support it.  Whether you agree with the lawyer or the banker is not so important.  The banker argues that the death penalty is a more humane punishment, while the lawyer argues that life in prison is more humane.  



"Which executioner is the more humane, he who kills you in a few minutes or he who drags the life out of you in the course of many years?"



It is an interesting question, because neither man is arguing that the prisoner should ever get out of jail.  Both the banker and lawyer agree that the prisoner will die in prison.  The banker simply believes that getting the death over with sooner is more merciful than letting the prisoner slowly waste away.  On the other hand, the lawyer argues that living any life is better than no life at all. 


I guess my own personal argument would change based on which situation I might be in.  If I were the prisoner, I would want life in prison . . . I think.  Life in prison would allow me time to read and learn, which is what the lawyer did.  Also, I just can't see myself wishing for an immediate death.  


If I were the state/government/system/etc., I might argue for a speedy execution.  This is going to sound cold, but if the prisoner is guaranteed to die no matter what, a quick execution frees up more jail space and no money is spent feeding and caring for that prisoner for 50 years.  

Wednesday, January 28, 2015

The mass of a toy spoon is 7.5 grams and it's volume is 3.2 ml. What is the density of the toy spoon?

The density of a substance is the ratio of its mass to its volume. In other words,


density = mass of a substance / volume of the substance = M / V


where M is the mass of the substance and V is its volume.


In this case, the mass of the toy spoon is 7.5 g and hence M = 7.5 g.


The volume of the toy spoon is 3.2 ml and hence V = 3.2 ml.


Thus, the density of the spoon can be calculated as:


density = M / V = 7.5 g / 3.2 ml = 2.344 g/ml or 2.3 g/ml (rounded off)


Thus, the density of the toy spoon is about 2.3 g/ml. We can also write the density as 2.3 kg/l or 2344 kg/m^3. 


Note that the toy spoon is 2.344 times heavier than the water (which has a density of about 1000 kg/m^3).


Hope this helps. 

What is a vasectomy?


Indications and Procedures





The term
vasectomy
, literally meaning "cutting the tubes," describes a minor surgical procedure performed on a man who desires a permanent form of birth control. Vasectomy results in sterilization because it obstructs the passageway through which sperm travel to reach the female ovum. A man’s testicles produce both male hormones (that stimulate male characteristics and sex drive) and sperm. A collection of small tubes called the epididymis along each testicle mature and deliver sperm to a single tube called the vas (or vas deferens), which is about the width of a spaghetti noodle. Each vas runs through the scrotum, up the groin on each side, and through the wall of the abdomen, ending in a storage area called the seminal vesicle, which is next to the prostate gland near the base of the penis. From there, the sperm mix with semen from the prostate gland and are expelled from the penis during ejaculation.



Vasectomy occludes (closes off) the vas to block the passage of sperm without affecting the important hormonal functions of the testicle. The surgery is done in the first, straight part of the vas, above the testicle and through the skin of the scrotum, making the procedure relatively easy and safe to perform.


Physicians performing vasectomy come from the specialties of urology, family medicine, general practice, or general surgery. Since the procedure is relatively simple, in comparison with other surgeries, physicians’ expertise usually depends more on specific training and interest in performing vasectomies and following up on the procedure than on their particular specialty training.


Vasectomies are usually done on an outpatient basis, either in a physician’s office or in a hospital-based or freestanding ambulatory surgery facility. Local anesthesia of the skin and the vasae is produced by an injection into the scrotum, which can be briefly uncomfortable until the medication has taken its full effect (usually after several seconds). Because of anxiety on the part of many men about having any discomfort in this area, many patients and physicians also choose to use sedation in the form of either tranquilizer pills or an injection for both mental and physical relaxation during vasectomy.


A number of techniques can be used safely and effectively by a physician performing a vasectomy, but the procedure can be thought of in terms of accomplishing three basic goals: The first is anesthesia, or the placement of numbing or freezing medication into the scrotum; the second is to gain access to the vas; and the third is its occlusion to prevent the passage of sperm.


Vasectomy can be made almost completely painless when
local anesthesia in the form of medication such as lidocaine is used; this drug is similar to the anesthesia commonly used for dental procedures. By blocking the local nerves that send pain messages to the brain, normally painful procedures can be performed with little or no discomfort. A man having a vasectomy will feel the needle used to inject the medication into the skin and then a brief stinging sensation until it takes effect. The rest of the injection into the tubes themselves may or may not cause further discomfort, what some men describe as a pulling sensation.


The standard access procedure that the physician uses can vary with training and experience. It involves making either one incision into the scrotum in the middle of the front side or two incisions, one on either side. The incisions are made after the physician positions the vas directly under the skin, and then the other layers of tissue are separated to expose the vas itself. After each vas is occluded, the incision, which is between 1 and 1.5 centimeters long, must be closed with stitches, usually the type that dissolve and do not have to be removed.


A refinement of the access procedure, called the “no-scalpel” vasectomy, was introduced into the United States in the late 1980s. It originated in China in 1974, and a study comparing it with a standard technique found a more than 80 percent reduction in postoperative complications. It is being adopted only gradually by United States physicians, however, because performing it requires two simple but specially designed surgical instruments and because some physician retraining is required. Many physicians with experience in the new procedure believe that it should become the new standard for the vasectomy access procedure.


The occlusion of the vas is important because it determines the success of the vasectomy in preventing pregnancy. The physician can choose to occlude the vas ends by simple tying, folding back and tying, applying small metal clips, or cauterizing (burning with heat or special electrical current). In addition, one of the vas ends can be covered with a layer of the tissue that surrounds it to form a further barrier to sperm. Although all occlusion methods have been effective, cautery of the opening of the vasae may be the most reliable because it depends less on the technical precision of the physician doing the vasectomy than do the other methods, which can fail if applied too loosely or too tightly.


Finally, some physicians perform an open-ended technique, in which the end of the vas coming from the testicle is left open while only the outgoing end is occluded. This is thought to reduce the amount of backed-up sperm that can cause later complications and to make it easier to perform a vasectomy reversal. Some physicians believe, however, that the rate of vasectomy failure is higher with this technique.


Men from all over the world choose to have vasectomy performed, including about one-half million Americans every year. Vasectomy has been commonly available in the United States since the 1960s and is the fourth most commonly used birth control method overall, with one in eight women stating that they rely on this contraceptive method.


Some men who have undergone vasectomies choose, for various reasons, to reverse them. In such a reversal procedure, the patient, under general anesthesia, has a one- to two-inch incision made in the scrotum over the site of the previous vasectomy. The ends of the vas deferens are located and cut free of the surrounding scar tissue. A drop of fluid from the testicular end of the vas is placed on a glass slide and examined under an electronic microscope to determine precisely what kind of microsurgery is most appropriate.




Uses and Complications

Most physicians make recommendations to the patient about what should be done, or not done, following a vasectomy, including activity restriction, pain control strategies, and follow-up. A period of rest for about forty-eight hours after a vasectomy helps to prevent pain and complications such as postoperative bleeding into the scrotum, which causes swelling. All sexual activity should be avoided for up to a week. Many men find more relief from an ice pack applied to the scrotum for the first few days following the surgery than from any medication, although acetaminophen (such as Tylenol) or mild prescription narcotics are often helpful as well. Aspirin and ibuprofen, although effective for pain, are generally best avoided in the first few days following a vasectomy because they have a blood-thinning effect that may increase the tendency to bleed. Because aspirin has a longer-lasting blood-thinning effect on platelets (the small blood cells that initiate normal blood clotting and stop minor bleeding), it should also not be taken for about ten days prior to the vasectomy.


Follow-up with a physician should be available in case complications occur in the period immediately following the vasectomy. The physician must also check the semen to ensure that no sperm are present. If sperm remain, it may indicate that one or both vasae remain open or have grown back together, meaning that the procedure has failed and the man remains fertile. If there are no sperm in the semen three to six months after the vasectomy, then it is extremely unlikely that a failure can still occur. Most doctors do not recommend any further follow-up unless a problem arises.


Informed consent means that the patient who will undergo a treatment has been given the opportunity to understand the risks and benefits of that treatment. In the case of vasectomy, the risks are pain, complications, the chance that it will fail, and the possibility that there will be a change of heart and that the man will want to father more children. The benefit is having very reliable, safe, and permanent birth control without ongoing costs or effort required.


The complications of vasectomy are best thought of in terms of those occurring early and late. Early complications include infection and hematoma. Infection is fairly uncommon but can include symptoms of pain, swelling, fever, redness, and abnormal drainage from the vasectomy wound. Treatment consists primarily of antibiotic medication. A
hematoma is a collection of blood in a localized area such as the scrotum. Blood vessels in the scrotum that are cut or torn during vasectomy and not tied, clipped, or cauterized can ooze a small or large amount of blood. In the worst case, surgery to remove the blood may be considered to relieve pain and pressure. Fortunately, small hematomas resolve without surgery in a few weeks’ time, and the more serious ones are rare, probably occurring in far less than 1 percent of vasectomies.


Later complications include problems with the area between the vasectomy incision and the testicles. Because the sperm are blocked from leaving the vas, and therefore the testicle, they can accumulate and cause three possible problems. First, sperm may back up at the site of the vasectomy and form a knot of sperm and inflamed scar tissue known as a sperm granuloma. It can be a painless lump, tender to pressure, or in rare cases it may be painful enough to require surgery to remove it. If swelling occurs because of accumulated sperm along the collecting area between the straight vas and the testicle (called the epididymis), the area can become tender or painful; this is known as congestive epididymitis. If this process extends backward to the testicle, it is known as orchitis. Fortunately, it is also rare for surgical removal of the entire epididymis to be required for relief of pain; sperm production slows in response to the pressure, and the body reabsorbs old sperm, eventually eliminating the pressure. Therefore, it is usually recommended that congestive
epididymitis be treated with anti-inflammatory pain relievers such as ibuprofen, as well as with soaking in a warm bath.


Since there are many misconceptions about the risks and complications of vasectomy, it is useful to point out some problems that are not associated with the procedure. The complications of vasectomy are relatively minor and very rarely require hospitalization. Deaths and major surgical complications are largely unheard of. Impotence, loss of sexual drive, and changes in male characteristics such as beard growth, body hair, and voice do not occur. An apparent link between vasectomy and the hardening of the arteries that causes heart attacks has been disproven since the only such study was publicized in the late 1970s. Although a slight statistical association between vasectomy and cancer of the prostate gland was noted in two studies published in 1993, experts do not believe that vasectomy causes or contributes to prostate cancer because there is no reasonable mechanism for it to do so. Many men with milder forms of
prostate cancer never die from it, and the statistics can be misleading because men who have seen a doctor for a vasectomy are also more likely to see a doctor for a prostate examination. Therefore, vasectomy may lead not to a greater risk of prostate cancer but to better detection of this disease.




Perspective and Prospects

Vasectomy has been performed to cause sterility since 1925, but its common use for that purpose started in the 1960s. The concepts of birth control and the desirability of limiting family size became increasingly valued in industrialized countries. Some states in the United States removed legal barriers to sterilization around this time, and the oral contraceptive or birth control pill became available to large numbers of women. These developments and the increased openness to discussion of sexual topics helped to form the basis for what was labeled the sexual revolution. In this environment, vasectomy became quite popular. It exceeded female sterilization by the early 1970s, driven in part by reports of the side effects of birth control pills. Sterilization for women (also called
tubal ligation, literally “tying the tubes”) is more invasive than vasectomy because the surgeon must enter the woman’s abdomen to occlude the tubes that enable eggs to pass into her uterus. Therefore, vasectomy is somewhat safer when seen in the perspective of family planning. The women’s movement of the 1960s placed a new emphasis on the control that women have over their bodies, especially in relation to health and medical decisions. Because the man can assume some of the reproductive responsibility and undergo a safer procedure, vasectomy also has a philosophical advantage for many couples.



Technological innovation by the mid-1970s had produced the first laparoscopic instruments, which enabled a gynecologic surgeon to enter a women’s abdomen through two pencil-sized openings and identify and occlude her Fallopian tubes. This procedure, safer than the old one, with visibly smaller scars, and performed by obstetrician-gynecologists (the physicians whom women see most often), quickly became more popular than vasectomy and has remained so ever since. In spite of its high degree of safety, laparoscopic tubal ligation still occasionally results in deaths from general anesthesia and abdominal complications necessitating major surgery. Yet, even though tubal ligation costs three to five times more than vasectomy, it is still done more than twice as often. There are probably several reasons for this discrepancy, one of the most important being that when a woman has to make the sterilization decision alone, only tubal ligation can be chosen. When a woman is single or in a relationship with a lower level of commitment, or when there is a lack of consensus or support for the decision between the two partners, it is often easier for the woman to choose a tubal ligation. When a decision is made by a couple together, however, the risks and benefits give a comparative advantage to the male sterilization procedure.


When a couple makes a well-informed and mutual decision to choose vasectomy, the feelings in the months following the procedure most commonly include an increased sense of relaxation about sex because of lack of fear of unwanted pregnancy and an absence of anxiety and/or side effects related to contraceptive methods. On the other hand, if one of the partners was not ready and feels pressured into acceptance, the vasectomy decision can create irreconcilable conflict in the relationship.


Most doctors and clinics that counsel men about vasectomy emphasize the fact that vasectomy should be regarded as permanent. Every year, thousands of men seek the reversal of their vasectomies. Although the vasae can be surgically “spliced” back together in a safe and minor operation called vasovasostomy, sometimes years after a vasectomy, there are many reasons not to expect a simple reversal of the procedure. Reversal is expensive and often not covered by medical insurance, and the chances of restored fertility (as measured by later pregnancy) are only about 50 percent. The odds of reversal can be improved if the surgeon (usually a urologist) has substantial experience in the procedure, a microsurgical technique is used, and the vasectomy was relatively recent, and perhaps if the open-ended technique was used as well.


Some highly experienced urologists claim a 95 percent success rate in reversals, so patients should be cautioned to seek out a urologist who has extensive experience in performing the procedure. Reversal certainly offers hope to someone who has undergone a divorce or personal tragedy and wants to start a new family, but an ambivalent couple should not be reassured that after vasectomy they can change their minds and easily reverse the procedure.


The decision process by a man or a couple to pursue a vasectomy for family planning reasons often begins years before the procedure is actually done. First, they must feel that they have completed their family and be aware of vasectomy as a birth control option. Dissatisfaction with other birth control methods because of inconvenience and real or feared side effects often presses the decision. Discussion about vasectomy with one or more patients who have had one is a very common prerequisite to the decision for many men. Finally, a scare that an unwanted pregnancy can occur—such as a late period or a broken condom discovered too late—or even an actual unplanned pregnancy itself may be the last straw for many couples. The high rates of satisfaction with vasectomy may be attributable to the strong sense of comfort that follows this long and thorough decision process.




Bibliography


Connell, Elizabeth B. The Contraception Sourcebook. Chicago: Contemporary Books, 2002.



Denniston, George C. Vasectomy. Victoria, B.C.: Trafford, 2002.



Haldar, N., et al. “How Reliable Is a Vasectomy? Long-Term Follow-up of Vasectomised Men.” The Lancet 356, no. 9223 (July 1, 2000): 43–44.



Health Library. "Vasectomy." Health Library, October 26, 2013.



MedlinePlus. "Vasectomy." MedlinePlus, May 20, 2013.



Miller, Karl E. “No-Scalpel Technique vs. Standard Incision.” American Family Physician 61, no. 5 (March 1, 2000): 1464.



Parker, James N., and Philip M. Parker, eds. The Official Patient’s Sourcebook on Vasectomy. [N. p.]: ICON Group, 2007.



Paulson, David. “Diary of a Vasectomy.” American Health 12 (July, 1993): 70–75.

Tuesday, January 27, 2015

What brush should I use for abstract art?

First, the fact that you are considering using a brush at all puts you far back in art history. Ever since the 1950s, with the art of Jackson Pollock and other abstract impressionists, applying paint to a canvas could include dripping (direct application using gravity and the natural qualities of liquids). An important small film called “ Day of the Painter” (1960) showed the world how that technique worked.


As for your paintbrush choices, there is no "should" in artistic expression. Much of your decision depends on what you want to do with color and light, what you want to “say” with your abstract piece. A painter in the twentieth century would intentionally exaggerate his/her brushstroke, because that kind of artist was interested in displaying the act of painting.  But earlier in art history, that was not the case.


Before the invention of photography, the most important purpose of painting was to depict and preserve a real-life image (a portrait, a landscape, an historical moment, etc.), but in Modernism, the goal was to create a visual image that had not existed before that painting existed. Consequently, the use of a broad series of bristle brush sizes and textures was necessary to recreate reality, but in Modernism such tools as wide, flat brushes (and trowel knives) served well.


Mark Rothko, in his abstract expressionist, beautiful, almost spiritual canvases of rectangular monochromatic contemplative pieces (1940-1970), smoothed out his colors in such a way that brush strokes were virtually invisible.

Monday, January 26, 2015

What does Steinbeck tell you about migrant farm workers?

Steinbeck wanted to tell the American people that migrant farm workers were not just anonymous hoboes trudging from ranch to ranch with their belongings on their shoulders tied up in bed-rolls. They were real human beings, all with separate personal identities, and all with their feelings, hopes and dreams, some with exceptional characters and talents, such as Slim. No one before Steinbeck had paid any attention to the lives of itinerant farm workers in California. Steinbeck wanted the American public to take an interest in their plight. He was successful, and this led to improvements in living and working conditions via legislation. Farm workers had had no protection. Their working conditions were brutal.


Steinbeck dramatizes how the men in his book had to work from sunup to sundown loading 100-pound bags of barley onto wagons. They worked six days a week. When they got too old to do that kind of heavy work, they were thrown out. There was a haunting sense of fear on these ranches. Candy and Crooks expect to get fired any day because they are losing their usefulness. Middle-aged men like Carlson can see their destinies in Candy and Crooks. For men like George it is nothing but an endless grind which will gradually wear them down until they are no longer worth even the low wages and poor food they receive. 


Steinbeck does not say what should be done about this problem in Of Mice and Men, although he does offer specific recommendations in his longer novel The Grapes of Wrath. Steinbeck obviously thought that the federal government should offer what people many called socialistic or communistic remedies for the deplorable conditions he described. The Great Depression destroyed a lot of Americans faith in the so-called American Dream and created an interest in the lives of ordinary people as opposed to those of the upper class. 

Sunday, January 25, 2015

How can I analyze Funeral Blues by W.H. Auden with reference to stanza, repetition and rhyme?

“Funeral Blues” is commonly viewed as a dirge; a melancholy poem in which the speaker laments the passing of his loved one, ordering the world to recognize his death.


The poem is composed of four stanzas of four lines each, separated into rhyming couplets. This means that the last two words of every two lines rhyme with each other, like the first couplet, where Auden rhymes “telephone” and “bone”. There are no other repeated internal rhymes.


The structural repetition in the poem is noteworthy, though. While Auden doesn’t repeat words (except in the third stanza), stanzas one, two and four follow a similar structural pattern. Each line is a different command to the world to take up some form of mourning (e.g. “Silence the pianos and with muffled drum / Bring out the coffin, let the mourners come.”). This repetition emphasizes the depth of the speaker's mourning.


The third stanza breaks this pattern, causing a crescendo in the piece. (“Funeral Blues” was originally written to music and the third stanza still acts similarly to the musical “bridge” in songwriting.) Instead of following the pattern of the previous two stanzas, the third stanza speaks directly about the person who has died as the speaker says what he meant to him. Within the stanza there’s repetition in the phrasing: “He was my North, my South, my East, my West” and “My noon, my midnight, my talk, my song.”

What are cognitive maps?


Introduction


Edward C. Tolman
first identified what he later named cognitive maps as a result of a series of experiments conducted in the 1920s and 1930s. In these experiments, Tolman sought to discover whether learning occurred that might not be immediately reflected in performance—what he came to term “latent learning.”









In a typical experiment, Tolman constructed an intricate maze. Three groups of hungry rats ran the maze once a day for twelve days. The first group, the rewarded control group, received food for successfully completing the maze. The second group, the nonrewarded control group, received no food; its members investigated the maze. The third group, the experimental group, also received no food for the first ten days of the experiment, and its members simply surveyed the maze. On the eleventh day, the experimental group was provided with food; on the twelfth day, this group performed as well as the rewarded control group.


Tolman concluded that latent learning had taken place and that under the appropriate conditions, the experimental group reflected this learning through its performance—the successful completion of the maze. He asserted that the rats had formed “cognitive maps” that enabled them to solve the maze. Therefore, learning—defined here as the construction of cognitive maps—is not the same as performance. Although learning is reflected in performance, Tolman’s work strongly suggests that the appropriate context is necessary to elicit that performance. In the case of the experimental group, the context was the food the experimenters provided on the eleventh day of a twelve-day experiment. The rats, Tolman inferred, anticipated that successful completion of the maze on the next attempt would result in their receiving the desired food.


Research has supported Tolman’s pioneering work. In 1978, Emil W. Menzel used chimpanzees to illustrate the spatial dimensions of cognitive maps. He hid food in a field and then carried a chimpanzee around the field with him. He did not allow the ape either to eat or approach the food, preventing both instrumental conditioning and primary reinforcement from taking place. Later, the chimpanzee that had been shown the food’s hiding places and five experimental chimpanzees that had not seen them were released in the field. Invariably, the first chimpanzee went directly to the food. The experimental animals found their food through scrutinizing the area near the chimpanzee that had been shown the hidden supply of food or begging food from this chimpanzee.


In 1976, David S. Olton and Robert J. Samuelson demonstrated spatial memory (cognitive maps) in rats through employment of a radial maze. Each arm of the maze had food at the end of it. Through a series of manipulations, the experimenters demonstrated that the rats remembered which arms they had explored and at which arms they had been fed. They eliminated the possibility that the animals used smell to locate the food through altering the animals’ sense of smell. Furthermore, other researchers moved the maze to note whether other factors, such as tactile clues, influenced the rats. In each variation of the experiment, the rats behaved as if they were responding to spatial location and not tactile clues. In 1985, William Roberts and Nelly Van Veldhuizen demonstrated that pigeons, as well as rats, can work the radial maze.




Learning Theories

Cognitive theories in learning have gained in popularity. Tolman’s groundbreaking work established the concepts of cognitive maps, internal spatial memories of the animal’s relevant environment, and expectancy, an animal’s anticipation of a sequence of events in time. Tolman’s work, supported and developed through additional research, further established the distinction between learning and performance. Linguists such as Noam Chomsky express this distinction as one between competence and performance.


Cognitive anthropologists, influenced by Tolman’s work, have applied the concept of the cognitive map to the learning of individuals within sociocultural systems. Cognitive maps, in the anthropologists' view, provide guides to cultural behavior by organizing psychological, social, and cultural landscapes in terms of their relevant characteristics for members of any given society. Two famous covers of the New Yorker magazine illustrate this point. One cover is a New Yorker’s view of the West. In that view, the entire center of the United States comprises an area smaller than Midtown Manhattan. The view to the east is little better: the Atlantic Ocean becomes a puddle, and the geography of Europe is greatly distorted. The point is not that New Yorkers are more ethnocentric than other people; it is that all people exaggerate those aspects of their landscapes or environments that are most important to them, and they neglect those features that they consider unimportant.


A number of factors enter into perceptions of what is most relevant and what is not. Some of these are personal, such as age, gender, likes, and dislikes; others are social, such as class, ethnic group, and occupation. All factors, however, fit into a cultural context and take on meanings within that context. Anyone attempting to understand the manner in which people learn and demonstrate that learning through adequate and appropriate performance must take into account these factors and how they help shape an individual’s cognitive map.


In education, the prior-learning approach has sought to come to grips with these issues and to apply them to instructional ends. Essentially, this perspective maintains that it cannot be assumed that learning has not taken place merely because a student does not demonstrate the desired performance. William Labov demonstrated, for example, that the presumed inarticulateness of African American street youths was a function of the setting in which people had tested them. In more natural settings, Labov determined that they were, in fact, highly articulate.


Tolman’s insight that rats in a maze will demonstrate latent learning through performance when an appropriate stimulus is present has influenced cognitive therapy. This therapy is based on the hypothesis that people base their behavior on cognitive maps and expectancies. These internal representations of spatial relationships and anticipated sequences of events, based on past experiences—psychological, social, and cultural—form individuals’ perceptions of reality, even when these stimuli are not materially present.


Cognitive motivation theory is a “pull” theory of motivation, based on the hypothesis that people’s expectancies provide incentives for behavior. There are positive-incentive and negative-incentive motivations. Working for a promotion along paths anticipated to achieve that desired goal is an example of positive-incentive motivation. In contrast, a youngster who is developing his or her martial arts skills to deal with bullies who frequently beat him or her provides an example of negative-incentive motivation.


Values enter intimately into cognitive motivation theory. To motivate people, incentives must be valued. If people do not value an incentive, such as a promotion, they are less likely to perform the actions they associate with receiving that incentive. If they receive the goal without performing the behavior—for example, if someone receives a promotion undeservedly—they are less likely to value the goal. In sum, there is an intrinsic relationship between expectancies and value.


Moreover, relief and frustration enter the picture. Relief refers to not receiving an expected negative result (a person does not fail a test for which he or she did not study). Frustration involves failure to attain a goal for which a person has prepared. Failure to receive a promotion to which a person is entitled is an example of frustration. Relief is an example of positive-incentive motivation, and frustration is an example of negative-incentive motivation.


Albert Bandura and others have advocated cognitive behavior therapy based on the application of positive and negative incentives. Such therapy seeks to alter the expectancies and relational maps of clients. Thus, clients can relearn their environment through redrawing cognitive maps and altering their expectancies. There are many techniques employed to bring about these changes in spatial and event expectations. Therapists who employ Albert Ellis’s
rational emotive therapy
believe that the therapist should take a strong interventionist role in the therapy, aggressively confronting the client whenever he or she exhibits examples of irrational thought. These confrontations seek to force clients to learn new, more rational ways of thinking and, therefore, behaving.


Cognitive behavioral therapists seek to change a person’s inappropriate thoughts to more effective ones. They first learn what their clients are thinking and then relate these thoughts to inappropriate behavior. They seek to help their clients learn new thoughts that will result in more appropriate behavior. Patients are taught to “talk to themselves,” substituting good thoughts for bad. Rather than dwelling on failure, patients concentrate on success or positive aspects of their lives. A student taking an examination, for example, would stop thoughts of failure and remind him- or herself about how well test preparation had gone. Self-encouragement would replace self-disparagement.


Each of these applications is based on the theory that people’s behavior is based on internal representations of the world. Each person’s representations differ in some way from those of others. These representations influence both the way in which one learns about the world and the manner in which one represents that world. The application of Tolman’s work on cognitive maps and their related internal representations, or expectancies, has led to a deeper understanding of learning.




Relevance of Cognitive Maps to Psychology

One of the important issues for the field of cognitive psychology is that of representation. In general terms, how do humans store information in the brain? In 1969, Allen Paivio presented the dual code theory, which suggests that both analogical and verbal codes are used for representing information. Some information maybe stored in an imagelike form (analogue), while other information is stored in a verbal format. In 1973, Zenon Phylyshyn advocated the propositional hypothesis, which suggests that concepts are stored in an abstract form that captures the underlying relationship between ideas. People may experience images, but this experience is simply a by-product, an epiphenomenon, of the retrieval of information. Research into cognitive maps may provide some insight into the issue of representation.




Sources of Information for a Cognitive Map

The development of a cognitive map may include in the representation information from a variety of sources, including landmarks, route information, and survey information. This information may be incorporated into a cognitive map over time and is not necessarily mutually exclusive. Salient features such as landmarks, distinctive objects that stand out from the rest of the environment, provide a point of reference for orientation and navigation within an environment. Route knowledge is specific information regarding how to navigate from one location to another. The directions one gives to allow another to navigate from one location to another would be similar to route information. Survey knowledge provides an overview of the relationships between locations; this perspective has a better grasp of the global relationship between various locations. This type of knowledge is acquired from maps by traversing the environment from a number of different perspectives.


In addition to the type of information available, a number of other factors can influence the development of a cognitive map, such as angle, shape, and orientation. These factors may lead to distortions in generating a map. For example, streets that cross each other at an odd angle tend to be drawn closer to a ninety-degree angle than they really are. Still other factors that are not spatial in nature may affect the retrieval of information. In 1991, Keith Clayton and Ali Habibi discussed the confounding of time and space. Locations experienced close together in space are often experienced close together in time. Retrieval of information, in some cases, may be due to temporal proximity versus spatial proximity. Other such factors in this category may include semantic clustering (grouping together of similar items) and route knowledge (grouping of items spatially and temporally).




Methods for Assessing Cognitive Maps

A variety of methods have been used to test spatial knowledge, including location judgment (whether a location is closer to one reference point or another), recognition (whether the item is part of the map or not), distance estimations (how far it is between two locations), map drawing, providing directions, and pointing (what direction would one travel from a given location to another specific location). In a 1986 study, Timothy McNamara discussed the merits of using tasks such as location judgment and recognition that allow one to look at priming, which taps into automatic processes. These tasks may be informative in terms of how spatial information is organized in long-term memory. Other tasks, such as pointing, may be more informative in terms of strategies that are used to answer spatial questions.


In 1978, Albert Stevens and Patty Coupe asked subjects which is farther west, Reno, Nevada, or San Diego, California. Many incorrectly inferred that San Diego is farther west than Reno, since California is farther west than Nevada. In actuality, the state of California curves under the state of Nevada, making Reno farther west. This implies the use of information such as relative position within categories (states) rather than actual spatial information between the two locations.




Other Areas of Research in Cognitive Maps

Research suggests that the ability to form and use a cognitive map begins to develop around the age of three. Judy DeLoache, in her 1987 experiments, used a scaled model of a larger room to test children’s spatial knowledge. Children of various ages were asked to find a small hidden toy in the model. After finding the small toy, children were then asked to find the larger toy, which was hidden in the same location in the larger room. This task required the child to use the information from the scaled model to find the object in the larger environment. DeLoache suggested that the younger children had a difficult time using the scaled model of a room as a basis for a representation of the larger room. Research in this area continues to look at the application and development of these skills over time.


Studies on gender differences in spatial knowledge have focused on strategies such as wayfinding and direction pointing. The use of such spatial strategies tends to be gender specific. It appears that women prefer to use a strategy of wayfinding based on the use of landmarks, while men tend to prefer using more of a global or survey strategy. Studies suggest, however, that these differences may be due to preferred strategies versus actual differences in acquisition of spatial knowledge.




Reality Representation and Behavior

Tolman’s concept of the cognitive map grew out of a recognition that internal representations of reality influence behavior. Moreover, learning is not indistinguishable from performance—the two processes are analytically distinct. An organism may have learned behavior without demonstrating that behavior through performance. This latent learning can be elicited through the presentation of adequate incentives.


Tolman’s work in the 1920s and 1930s did much to advance the field of cognitive psychology at a time when behavioral psychology dominated the schools. It provided an additional dimension to learning, advancing the position of internal representations of reality. The empirical evidence offered to support cognitive theory has been impressive, and its status in psychology has advanced accordingly; it is often combined with behavioral concepts, as in the work of Bandura.


That combination has enabled educators and therapists to bring about behavioral changes based on changes in the manner in which students and patients perceive their worlds. New internal representations of the external environment can be brought about through changes in cognitive maps and expectancies. In turn, these changes alter the bases of decisions that influence an individual’s future behavior.


Tolman’s work has influenced linguistics, anthropology, sociology, and other social and behavioral sciences. Scholars in these areas have applied the concept of the cognitive map cross-culturally and within cultures to members of subgroups. Future work will apply it to the manner in which each individual negotiates his or her way within cultural and social systems. Continuing work in anthropology and sociology in the negotiated nature of sociocultural systems draws heavily on cognitive maps. Prior-learning theory is based on the idea of latent learning, and future work will continue to extract applications of significant value to education.


Future advances will likely occur in studies that investigate field dependence and independence in cognition as related to other aspects of culture, such as child-rearing patterns and subsistence practices. The continuing interest in the relationship between language and the cultural organization of reality holds promise for further advances in understanding and applying cognitive maps. The role of choice in the individual’s construction of these maps is also an area of intensive investigation.




Bibliography


Bandura, Albert. Social Foundations of Thought and Action: A Social Cognitive Theory. Englewood Cliffs: Prentice, 1986. Print.



Bukatko, Danuta, and Marvin W. Daehler. Child Development: A Thematic Approach. 5th ed. Boston: Houghton, 2004. Print.



Carbon, Claus-Christian, and Vera M. Hesslinger. "Attitudes and Cognitive Distances: On the Non-Unitary and Flexible Nature of Cognitive Maps." Advances in Cognitive Psychology 9.3 (2013): 121–29. Print.



Chomsky, Noam. Language and Mind. 3rd ed. New York: Cambridge UP, 2006. Print.



Fromkin, Victoria, Robert Rodman, and Nina Hyams. An Introduction to Language. 10th ed. Boston: Wadsworth, 2014. Print.



Gallistel, C. R. The Organization of Learning. Cambridge: MIT P, 1990. Print.



Labov, William. The Social Stratification of English in New York City. 2nd ed. New York: Cambridge UP, 2006. Print.



Matlin, Margaret W. Cognition. 8th ed. Hoboken: Wiley, 2013. Print.



Menzel, Emil W. “Cognitive Mapping in Chimpanzees.” Cognitive Processes in Animal Behavior. Ed. Stewart H. Hulse, Harry Fowler, and Werner K. Honig. Hillsdale: Erlbaum, 1978. 375–422. Print.



Olton, David S., and Robert J. Samuelson. “Remembrance of Places Passed: Spatial Memory in Rats.” Journal of Experimental Psychology: Animal Behavior Processes 2.2 (1976): 97–116. Print.



Pazzaglia, Francesca, and Angelica Moe. "Cognitive Styles and Mental Rotation Ability in Map Learning." Cognitive Processing 14.4 (2013): 391–99. Print.



Roberts, William A., and Nelly Van Veldhuizen. “Spatial Memory in Rats on the Radial Maze.” Journal of Experimental Psychology: Animal Behavior Processes 11.2 (1985): 241–60. Print.



Suzuki, Ikuo. "Effects of Sense of Direction on Internet Skill and Cognitive Maps of the Web." Computers in Human Behavior 28.1 (2012): 120–28. Print.



Tolman, Edward C. “Cognitive Maps in Rats and Men.” Psychological Review 55.4 (1948): 189–208. Print.



Tolman, Edward C. Purposive Behavior in Animals and Men. New York: Century, 1932. Print.



Zhu, Qing, Rubin Wang, and Ziyin Wang. "A Cognitive Map Model Based on Spatial and Goal-Oriented Mental Exploration in Rodents." Behavioural Brain Research 256 (2013): 128–39. Print.

Saturday, January 24, 2015

What is the significance of the word choice in "The Ransom of Red Chief"?

The entire story is told by Sam, so the account is in the first-person and from Sam's point of view. O. Henry needed to establish that such a character was capable of writing what is actually a rather complicated tale. The author makes Sam seem like a con-man who is not educated and only superficially glib. The reader can sense that Sam has picked up a lot of big words in order to be able to impress the yokels to whom he and Bill sell bogus town lots and other spurious items such as worthless stock certificates and shares in abandoned gold mines. Sam is glib like a barker at a carnival. He may remind some readers of the two imposters in Mark Twain's The Adventures of Huckleberry Finn who pose as The King and The Duke and sometimes pretend to be Shakespearean actors. Like Sam and Bill, The King and The Duke learn that, as Abraham Lincoln may have said:



You can fool all the people some of the time and some of the people all the time, but you cannot fool all the people all the time.



The story is liberally sprinkled with Sam's pretentious vocabulary. For example:



It contained inhabitants of as undeleterious and self-satisfied a class of peasantry as ever clustered around a Maypole.


Philoprogenitiveness, says we, is strong in semi-rural communities;


There was a sylvan attitude of somnolent sleepiness pervading that section of the external outward surface of Alabama that lay exposed to my view.



Sam does not use big words solely to impress people. He is the type of person who loves to play with words. Under different circumstances he might have been a teacher, a journalist, or a lawyer. But he is obviously self-educated. He makes many grammatical mistakes. Although Sam and Bill are only a couple of cheap crooks who are guilty of kidnapping a child in an effort to raise money for a swindling scheme, we feel a little bit sorry for them at the end. Bill is not articulate, but he is good-hearted. Sam has never realized his potential because education was not as readily available in O. Henry's time as it is today. Both men have wasted lives. They are getting along in years but have only managed to accumulate $600 between them after years of running around the country trying to bilk the public. And they end up having to hand over $250 of their meager capital just to get rid of their "victim."


"Deleterious" means harmful. So "undeleterious," if there were such a word, would mean harmless. "Philoprogenitiveness" must mean loving one's children. "Somnolent sleepiness" and "external outward" are, of course, tautologies. O. Henry himself was guilty of using grandiose language for humorous purposes. Here is a sample from "The Cop and the Anthem":



The hibernatorial ambitions of Soapy were not of the highest. In them there were no considerations of Mediterranean cruises, of soporific Southern skies drifting in the Vesuvian Bay. Three months on the Island was what his soul craved. Three months of assured board and bed and congenial company, safe from Boreas and bluecoats, seemed to Soapy the essence of things desirable.


How did the Civil War change the South from Old South to New South?

The Civil War changed the South in several ways. The “Old South” was different from the “New South.” One difference was with the southern economy. Before the Civil War began, the South was almost exclusively an agricultural region. After the Civil War ended, as a result of the rebuilding of the South, the economy was more diversified. More industries began to develop in the South. While agriculture was still important, industries provided jobs for more people.


Another difference was in the area of transportation. More railroads were built in the South as the railroads began to expand. The South became less dependent on river transportation. This allowed for products and for people to be transported quicker in the South.


Slavery had ended in the South. The former slaves were able to get an education, formally marry each other, and get paid for the work they did. They also received the rights of citizenship that couldn’t be taken away without the due process of law. African-American males were able to vote and to run for office. Some got elected to political office. Even though restrictions were placed on the voting rights after Reconstruction ended, for a period of time after the Civil War ended, African-American males were voting.

What are contagious diseases?


Definition

Contagious diseases are those diseases caused by pathogenic (disease-causing)
agents, such as bacteria, viruses, and fungi, that
infect the body. Contagious diseases, also called communicable diseases, are
spread from person to person through direct contact or through contact with body fluids.





Distinguishing Features

Microorganisms are invisible and abundant residents of every habitat on Earth. Many have adapted to live inside the human body, and the vast majority reside there harmlessly or even with great benefit to the host. A small fraction of these microbes are pathogenic and can lead to infectious disease in humans. An even smaller number of pathogenic microbes can be transferred directly from one person to another, causing diseases that are termed “contagious.”



Not all infectious diseases, however, are contagious. An example of an
infectious but not contagious disease is malaria,
which is caused by the protozoan Plasmodium falciparum, which is
transferred from one person to another by the bite of a mosquito. Direct contact
with the infected person or with that person’s body fluids will not spread this
disease. A notorious contagious infectious disease is influenza,
which is caused by an orthomyxovirus that is easily spread
from one person to another.




Biology of Pathogenic Organisms

There is great diversity among the types of microorganisms that are pathogenic.
Contagious diseases are caused by viruses, bacteria, fungi, protozoa, and
helminths. The specific biology of each organism determines what part of the body
it will infect, what symptoms it will cause, how it will be spread from one person
to another, and how it can be treated.



Viruses. Viruses are the smallest and simplest of all the
pathogens that cause contagious diseases. They do not have
cells and are not considered to be living organisms. Viruses are effectively
designed containers, built to transport the genetic material they carry inside.
They contain all the genetic information needed to re-create, so they have no
materials or machinery for reproduction. After entering the body of a
host animal, a virus reproduces by infecting a cell and
taking over its reproductive machinery. New viral particles are assembled inside
the cell and then released to the outside, where they can infect more cells.


Viruses cause a wide range of contagious diseases, many of which are serious or
life-threatening. Treatment for viral infections is extremely limited or entirely
unavailable. Because viruses exist inside human cells, it is difficult to destroy
them without also killing the cells. Drugs that could potentially destroy a virus
would be extremely toxic or fatal to the infected person. Antibiotics
work only on bacteria, making the human immune system the most critical factor
in recovery from viral infections.



Bacteria. Bacteria are living single-celled organisms that are
much more complex than viruses and about one hundred times larger. Bacteria are
extremely significant to medicine, as they are responsible for large numbers of
serious human illnesses. Bacteria are classified as prokaryotes
because their cells have a simpler structure than those of plants and animals,
which are eukaryotes. Despite their relatively simple structure,
bacteria possess all the machinery necessary to grow and reproduce on their own.
They are the smallest creatures on Earth that have this capacity. This feature
sets them apart from viruses, which depend on host cells for reproduction. The
small size and relatively simple structure of bacteria allows them to grow and
reproduce rapidly.


A variety of antibiotics are available for the treatment of many bacterial
diseases. These drugs target features of bacterial cells that are not present in
eukaryotic cells. In this way, the drugs can kill the bacteria without damaging
human cells. However, many bacteria have developed resistance to antibiotics. This
worldwide problem limits the treatment options for a growing number of
bacterial
infections.



Fungi. Fungi are common eukaryotic microorganisms that only rarely cause disease in humans. Fungi have complex cells and a structure resembling those of plants. Unlike plants, fungi lack chlorophyll, so they cannot make their own sugars; they must live on nutrients found in their environment. Most take up residence on decaying plant matter and in soil. Fungi grow in two forms: molds and yeasts. Molds are quite common in nature. They are made of long filaments that branch and intertwine, creating the familiar mats that are often seen growing on bread and cheese. Yeasts are unicellular fungi that commonly live on fruits and flowers, thriving on the sugars provided there. Some are normal inhabitants of the human body.


Serious contagious diseases caused by fungi are quite rare in healthy persons.
People who are seriously ill or have weak immune systems are more susceptible to
fungal
infections. Antifungal drugs are available and are effective
against many fungal diseases.



Parasites. Parasites are eukaryotes that live on other living
organisms for nutrition, without providing benefits to their hosts.
Parasitic
diseases are among the major causes of human suffering and
death in the world. Contagious human parasites include protozoa and helminths.
Protozoa are microscopic, unicellular eukaryotes, and as such are more complex
than bacteria and have more in common with human cells. They are ten times larger
than bacteria, and most can move or “swim.” These organisms feed by taking in
fluid from their surrounding environment, and they reproduce inside the body of
the host. Helminths are multicellular macroscopic worms that find nutrients in
body fluids and intestinal contents. Unlike protozoan parasites, most helminths
must leave the host to lay eggs, which are the infective forms of the
organism.


Drugs are available for the treatment of parasitic infections, but few of them are ideal. Similarities between human and parasite cells make it difficult to design drugs that can kill parasites without also being toxic to humans. Some drugs require long-term administration, which is not practical in many developing nations.




Routes of Transmission

Pathogenic organisms vary in the way they spread from one host to another, a feature known as the route of transmission. For each pathogen, the route of transmission will determine where it enters and infects the body, how it spreads through a population, and how spread of the disease can be controlled. The routes of transmission for the agents of contagious diseases include airborne transmission, fecal-oral transmission, and direct transmission.



Airborne transmission. Airborne transmission occurs through the inhalation of infectious agents in aerosols that are released from an infected person. Aerosolized droplets are expelled by sneezing or coughing. The smallest of these droplets can remain suspended in air for a surprisingly long time (twenty minutes or longer). Inhaling the aerosol will introduce the pathogen into the respiratory tract. Different pathogens will infect different regions of the airways. Larger particles tend to settle from the air onto tissues sooner than do smaller particles, so the larger particles cause primarily upper respiratory infections. Smaller particles can infect the lower respiratory tract. Airborne pathogens can also be spread indirectly by contact with respiratory secretions that are on hands or inanimate objects. These organisms are then transferred to the airway through touching the nose, eyes, or mouth.


Organisms with airborne routes of transmission cause respiratory infections.
The most common contagious infections worldwide are respiratory, because
transmission through aerosols and contaminated objects occurs quite easily in
normal daily activities. This mode of transmission is also known as casual
contact. The majority of respiratory infections are caused by viruses. These
include the common cold (rhinoviruses), influenza
(orthomyxovirus), measles (paramyxovirus), and viral pneumonia
(multiple virus types). Bacterial respiratory infections include tuberculosis
(Mycobacterium tuberculosis), pneumonia (multiple species),
strep throat (Streptococcus pneumoniae), and whooping
cough (Bordetella pertussis). Some fungal
diseases are respiratory. Most are caused by fungi that a healthy person’s body
can fight without consequence. The more common fungal respiratory infections
include valley fever (Coccidioides immitis), histoplasmosis (Histoplasma capsulatum),
and cryptococcosis (Cryptococcus
neoformans
).



Fecal-oral transmission. Fecal-oral
transmission is a common route of spread of many bacterial,
viral, and parasitic diseases. Organisms that are spread in this manner grow in
the digestive tract, are present in feces, and usually cause diarrhea or vomiting.
Infection occurs either by direct contact or through consumption of food or water
that has been contaminated with human feces. Food can become contaminated by a
food handler who is ill, particularly if the handler’s personal hygiene technique
is inadequate. Raw shellfish, fruits, and vegetables that are washed in
contaminated water can also spread disease. Waterborne pathogens are common in
developing countries where sewage and drinking water are not treated. Natural
disasters, such as earthquakes and floods, can breach water-treatment systems and
cause outbreaks of waterborne illness.


Diarrheal diseases, which are the third leading cause of death in the world,
are most often spread by fecal-oral transmission. Two of the most important are
typhoid
fever (Salmonella typhi) and
cholera (Vibrio cholerae). These
life-threatening bacterial illnesses are most often spread through contaminated
water. Water purification methods have nearly eliminated these diseases in many
countries, yet they remain a serious threat in many areas of the world. Outbreaks
of intestinal illnesses, including those on cruise ships, are often caused by
viruses (norovirus and rotavirus) that are spread through food
by infected food handlers. Fecal contamination of food is the most common source
of infection by the hepatitis A virus. Parasites can also
be transmitted through food and water. Cryptosporidium parvum,
Entamoeba histolytica, and Giardia
intestinalis
(also known as G. lamblia) are all
protozoa that cause severe diarrhea. While rare in areas with good sanitation,
these illnesses are still extremely common worldwide. It is estimated that 10
percent of the world’s population and 2 to 3 percent of the U.S. population are
infected with E. histolytica, which causes amebic
dysentery.



Direct contact transmission. Some pathogens are so sensitive to the environment outside the human body
that they cannot survive long enough to be transmitted by casual contact. These
organisms must be transmitted from one person to another directly—through the
exchange of body fluids during sexual contact, blood transfusion, birth, or
breast-feeding. Bacterial infections that are transmitted through sexual contact
only include syphilis (Treponema pallidum),
gonorrhea (Neisseria gonorrhoeae), and
chlamydia (Chlamydia trachomatis). A number
of pathogenic viruses are transmitted through direct contact. These include human
immunodeficiency virus (HIV); hepatitis virus B, C and D; and herpes simplex virus
(HSV). Other pathogens are transmitted directly through contact with the skin,
often entering through a wound or break in the skin. Staphylococcal
infections (Staphyloccocus aureus) are
transmitted in this manner. Antibiotic-resistant forms of staph infections are now
common among athletes and are spread during contact sports and in locker
rooms.




Prevention

Public sanitation programs have had a profound impact on the incidence of contagious diseases in developed countries. Public health measures to prevent the spread of waterborne and food-borne illnesses are generally quite effective. These measures include water purification and sewage treatment, waste removal, and enforcement of regulations to promote food safety during production and preparation.


A dramatic example of an effective public health program comes from data on typhoid fever in Philadelphia during the early twentieth century. In the ten years following the introduction of filtration and chlorination of the city’s water, the number of cases of typhoid fever dropped steeply from nearly ten thousand cases each year to just more than one hundred cases. This result is a heartening reminder that the spread of contagious diseases can be controlled.


Vaccination is the most effective method of preventing a variety of contagious
diseases. Recent innovations in molecular biology have enabled the development of
new vaccines that provide coverage against more diseases.
Despite the availability of a range of vaccines, many adults in developed
countries are not effectively immunized. In some cases, this is because immunity
from their childhood vaccines has faded or may not have been very effective to
begin with. In other cases, adults may not be aware that new vaccines are
available or that they need to be immunized against different organisms as they
age. Vaccination rates for children and adults in developing countries are low
because of financial barriers and a lack of infrastructure.


Certain measures for disease prevention are up to each person to adopt. Sexually transmitted diseases can be prevented by using condoms during intercourse. Handwashing is an effective way to avoid infection by organisms that are spread through respiratory and oral-fecal routes. One should wash his or her hands before and after handling food, after using the toilet or changing diapers, after sneezing or coughing, and before and after treating a wound. (Soap and warm water should be used to scrub hands for a minimum of twenty seconds. If water is not available, alcohol-based hand sanitizer is another good option.) One should often clean kitchen counter tops with soap and water. A disinfectant that destroys pathogenic organisms, such as 95 percent isopropyl alcohol, should be used occasionally in kitchens and bathrooms. One should avoid antibacterial soaps, however, because they are not more effective at killing bacteria than regular soap and can lead to the development of drug-resistant bacteria.




Impact

Contagious diseases have been intimately associated with human life throughout history. In fact, human history has been shaped by contagious diseases. These diseases continue to cause suffering, disability, and economic hardship for millions of people in both developed and developing nations. Every year, nearly one-quarter of all deaths worldwide (about 12 million) are caused by contagious diseases. Also, all nations face the financial burden of disease prevention and treatment. Widespread contagious illnesses can be so costly that they hamper the economic development and political stability of developing nations.




Bibliography


Flint, S. J., et al. Pathogenesis and Control. Vol. 2 in Principles of Virology. 3d ed. Washington, D.C.: ASM Press, 2009. Discusses the general principles of infection by viruses, the mechanisms of infection and its spread in populations, immune responses, vaccination, and antiviral drugs.



Gilligan, Peter H., M. Lynn Smiley, and Daniel S. Shapiro. Cases in Medical Microbiology and Infectious Diseases. 3d ed. Washington, D.C.: ASM Press, 2003. The most common pathogens are presented by affected organ systems. Includes medical cases with descriptive examples of symptoms associated with infection by particular organisms.



Madigan, Michael T., and John M. Martinko. Brock Biology of Microorganisms. 12th ed. Upper Saddle River, N.J.: Pearson/Prentice Hall, 2010. A standard microbiology textbook for undergraduate college students, with detailed descriptions of cell structures and clear illustrations. Includes evolutionary perspectives and covers pathogenesis.



Percival, Steven L., et al. Microbiology of Waterborne Diseases. San Diego, Calif.: Academic Press/Elsevier, 2004. Major pathogenic waterborne microorganisms are described in terms of physiology, reproduction, clinical features and treatment of infection, and survival in the environment.



Ryan, Kenneth J., and C. George Ray. Sherris Medical Microbiology: An Introduction to Infectious Diseases. 5th ed. New York: McGraw-Hill Medical, 2010. Standard medical microbiology textbook covering pathogen biology, clinical presentation and diagnosis, treatment, and epidemiology.



Shannon, Joyce Brennfleck, ed. Contagious Diseases Sourcebook. Detroit: Omnigraphics, 2010. For general readers, this sourcebook provides information about the transmission and treatment of contagious diseases. Includes facts about prevention, self-care, and drug resistance.



Wilson, Michael. Microbial Inhabitants of Humans: Their Ecology and Role in Health and Disease. New York: Cambridge University Press, 2005. Biology and ecology of microorganisms indigenous to the human body. Describes environmental features of all organ systems in the human body and discusses microorganisms that reside in each.

Friday, January 23, 2015

Why did Brian say that dipping his hands in the water was nearly the last act of his life?

Brian had just killed a fool bird and was going to try to rinse some of the blood off his hands. He felt that he was lucky to have turned at the last moment, as it gave him the chance to understand for a split second that something was coming for him. This realization also gave him a chance to take a deep breath just before the moose slammed into him and drove him into the water. 


This action may have been what saved him, given that the moose then drove him down to the bottom of the lake and seemed to hold him there. Even when the moose seemed to move on, he found out that she still attacked him if he moved too quickly. The two attacks were so fierce and so "insane" that they almost killed Brian. He was very happy that he managed to survive despite being hurt badly.

Do you think that President Roosevelt believed that the four freedoms existed in the United States in 1944?

President Roosevelt gave a speech in 1941 that referenced four freedoms everybody should have. These freedoms are freedom of speech, freedom of worship, freedom from fear, and freedom from want. It would be fair to conclude that President Roosevelt believed these freedoms existed in the United States in 1944.


Once the Constitution was adopted, we have always had freedom of speech and freedom of worship. During World War II, people were encouraged to watch what they said, and there was censorship of some information. However, for the most part, people were free to speak. People also had the freedom to worship as they pleased.


With the arrival of World War II, our economy began to improve. People went back to work, and soldiers fought in the military. As a result, the American people had more resources to buy things they needed. While some supplies were limited because of the war, our people were much less worried about not having enough money to get the items that they wanted to have.


Americans were growing in their confidence about how the war was progressing. We were winning important battles in Europe and in Asia. Africa had been freed from Axis control. While the war wasn’t over, Americans had much less fear in 1944 than they had in 1941. It was becoming more apparent that the Allies were defeating the Axis Powers. This eased the fear many people had at the start of the war, especially after Pearl Harbor was attacked.


By 1944, President Roosevelt was likely to believe that the four freedoms existed in our country.

What does the physical structure of the courthouse show about the people of Maycomb from To Kill a Mockingbird?

Scout describes Maycomb as being very old, and when she first describes the town she describes the courthouse. 



Maycomb was an old town, but it was a tired old town when I first knew it. In rainy weather the streets turned to red slop; grass grew on the sidewalks, the courthouse sagged in the square. Somehow, it was hotter then … (Ch. 1) 



This is a meaningful description.  It implies that the courthouse is tired out. The courthouse is old, and its ways are old.  It is not changing with the times, and it is not prepared for what it has to deal with. 


Scout describes how the courthouse is a product of a bygone era.  It had its heyday when Maycomb was a new town, full of promise. 



Because its primary reason for existence was government, Maycomb was spared the grubbiness that distinguished most Alabama towns its size. In the beginning its buildings were solid, its courthouse proud, its streets graciously wide.  Maycomb’s proportion of professional people ran high … (Ch. 13) 



By continuously bringing up Maycomb’s history and the history of the courthouse, Scout reminds the reader of the importance of heritage to Maycomb.  Tradition reigns.  Even when traditions are becoming quaint and outliving their usefulness, they hang on in Maycomb.  Racism will be a tradition that will be deep-set and hard to break with. 


A good example of this is the fact that the courthouse itself is basically the same one the town had in the beginning, even though it burnt down. 



The Maycomb County courthouse was faintly reminiscent of Arlington in one respect: the concrete pillars supporting its south roof were too heavy for their light burden. The pillars were all that remained standing when the original courthouse burned in 1856. Another courthouse was built around them. It is better to say, built in spite of them. (Ch. 16) 



Tradition is so important that the town just built a new courthouse around what was left of the old one, trying to maintain what it once had.  Nothing changes, even when things are forced to change.  It is important to honor origins.  Perhaps as a result, the courthouse itself seems to represent Maycomb’s identity crisis.  It is described as both Victorian and Greek revival.  The courthouse clashes with itself.


Thus, the physical nature of the courthouse mirrors what happens there.  During the trial, the town of Maycomb struggles with coming into a more enlightened and modern perspective, leaving racism behind.  However, it is a town so steeped in tradition that such a change would be very difficult, and is ultimately too much for Maycomb.  They get as far as getting a jury to deliberate, but they are not able to bring themselves to acquit the black man accused by a white man.

How would you arrange chromosome, gene, genome, and nucleotide in order from smallest to largest?

From smallest to largest: nucleotide, gene, chromosome, genome.


Nucleotides are the smallest building blocks of DNA. There are four nucleotides (A, G, T, C) which arrange in pairs to form the long double strands typical of DNA molecules. 


A gene is a segment of DNA which codes for the amino acid sequence of a particular protein. A gene is therefore composed of many pairs of nucleotides.


A chromosome is a long strand of DNA which is coiled up with various proteins. A chromosome contains many genes.


The genome is all the DNA of a particular organism. All of an organism's chromosomes compose the organism's genome.


To summarize, we can think of the genome as being composed of a collection of chromosomes, of chromosomes as being a collection of genes, and of genes as being composed of nucleotides.

What are the differences and similarities between Catherine and Myrtle in The Great Gatsby?

Catherine and Myrtle are sisters. Catherine is unmarried and lives in New York City and Myrtle is married but involved in an affair with Tom Buchanan. At the party in Catherine's apartment (Chapter 2), Catherine tells Nick about all the wonderful places she has visited. This scene establishes Catherine as a character who is adventurous and easily bored. Similarly, Myrtle frequently complains to anyone who will listen about her husband Wilson, a near-blind auto-mechanic who lives with Myrtle outside of the city. Therefore, Catherine is similar to Myrtle (who frequently leaves her boorish husband in order to fraternize with the more exciting Tom Buchanan) because they both are unsatisfied with their lives and are searching for something more. However, they are different because Catherine repeatedly proves to be the more conscientious of the two, for she provides the apartment in which Myrtle conducts her affair (thereby saving her sister's reputation) and rushes to Myrtle's aid after Tom breaks her nose during the fight in that same apartment. 

Thursday, January 22, 2015

Write the character sketch of young Jefferson of Three Men In a Boat, who was learning to play the bagpipes.

The narrator introduces us to this character in Chapter XIV of Three Men in a Boat. He says that he once knew a young fellow who was learning to play the bagpipes. But no matter where the man tried to practice, people were offended or even scared by the whiny sounds. From what little we’re told about him, it seems as though he was nevertheless quite determined to learn the nuances of the instrument, even if it meant that he was banished to practice at the other end of the property, away from everyone else. The narrator felt sorry for him:



There is, it must be confessed, something very sad about the early efforts of an amateur in bagpipes. I have felt that myself when listening to my young friend. They appear to be a trying instrument to perform upon.



No matter what the man did, it seemed he didn’t have the lung capacity to play the demanding instrument at length. He learned to play only one song successfully; but still, many people couldn’t identify the tune. Jefferson – whose name we are told only towards the end of the story – didn’t have the strength or the talent to make a go of it. And no one else supported him in his endeavor. He should have been applauded for making the attempt at such a challenge. But obviously, he was going to have to find something else to be good at. The narrator doesn’t tell us if Jefferson gave up the bagpipes and landed upon another occupation. Yet this is probably the logical conclusion to this character’s story. He would have to go through a process of self-realization first, because no one else seemed to want to tell him the truth about his music.

How would you balance the equation KOH + Ca(OH)2 ?

No reaction will take place when potassium hydroxide is mixed with calcium hydroxide.


Thus, KOH + Ca(OH)2 ---> no reaction


This is because both potassium and calcium are metals and will dissociate to form cations. The only anions are hydroxide ions, however. Hence, the possible new compounds are also the hydroxides of potassium and calcium. Thus, no reaction will take place and we don't have an equation to balance. 


If we mix potassium hydroxide and calcium chloride, we will have a reaction, which can be written as


KOH + CaCl2 -> KCl + Ca(OH)2


This equation is not balanced, since the number of atoms of each species should be the same on both sides of the equation. Here, chlorine (Cl), hydrogen (H) and oxygen (O) are not balanced.


The well balanced equation for this reaction is:


`2KOH + CaCl2 -> 2KCl + Ca(OH)2`


We can check that all the species have the same number of atoms on the reactant and product side and hence the equation is balanced.


Hope this helps. 

Wednesday, January 21, 2015

How long do the narrator's parents plan to live in the house on Mango Street?

The very first vignette in the book is also titled "The House on Mango Street." In it, Esperanza explains that her family was living on the third floor of an apartment building on a street called Loomis. They had to leave because the pipes broke and their stingy landlord wouldn't fix them. Her parents had always dreamed of buying a luxurious home, which had everything they ever wanted; so when they moved to the house on Mango Street, she was very disappointed. Her mother tells her that living on this street is only "For the time being;" and Papa says that it is only "Temporary" (5). The fact that her parents tell her that they won't be there forever gives Esperanza hope that she and her family will one day leave the barrio. Unfortunately, her hopes change over the course of the book from leaving with her family to just leaving by herself as she grows up. One year drags on to the next until the narrator says that she will buy her own house one day.

Why is Tybalt to blame for the deaths of Romeo and Juliet?

In Act I, Scene 1, when Romeo comes on the scene after the street fight which opens the play, he makes the comment that, while the feud between the Montagues and Capulets is based in hatred, it has more to do with a love for fighting:



O me! What fray was here?
Yet tell me not, for I have heard it all.
Here’s much to do with hate, but more with love.



This statement is quite true of Tybalt, Juliet's cousin. He is one of the instigators of the street brawl and seems bent on perpetuating the feud in any way possible. His anger and aggression are one of the major causes which lead Romeo and Juliet to commit suicide at the end of the play.



In Act I, Scene 5, he overhears Romeo speaking at Capulet's party and, when dissuaded by Capulet from fighting Romeo on the spot, vows revenge and sends a letter of challenge to Romeo. In the meantime, Romeo falls madly in love with Juliet and they marry before Romeo ever hears of the challenge. 



In Act III, Scene 1, Tybalt acts on his challenge by seeking out Romeo in the streets. He first comes upon Mercutio and the two trade insults before Romeo enters. When addressed as a "villain" by Tybalt, Romeo immediately backs down because he has just married Juliet. He even suggests that he loves Tybalt. Of course, neither Tybalt nor Mercutio know of Romeo and Juliet's romance and they wind up fighting. Unfortunately, Romeo is unable to stop the sword fight and Mercutio is eventually stabbed by Tybalt who then runs away. Had the scene ended here, Romeo and Juliet may have continued their lives and eventually even announced their marriage and brought the families together just as Friar Laurence had hoped when he performed the marriage.



Despite having already killed one man, "the furious Tybalt" returns to the scene. Obviously, his love of fighting has not been satisfied. Feeling he has been cowardly and "effeminate," Romeo fights Tybalt and promptly kills him. It could certainly be argued that Tybalt's return, and his death at the hands of Romeo, lead directly to the mischief which occurs in the second half of the play. Lord Capulet, believing Juliet to be grieving over her cousin's death, arranges a "day of joy" by promising Juliet to Count Paris. This plan puts Juliet in a problematic situation and ends in her faking her death and the other circumstances which lead to the final suicides of Romeo and Juliet. Tybalt, playing out his role as the main catalyst of feud, is easily blamed for the final tragic events.  

Tuesday, January 20, 2015

How old was Mona Lisa when she was drawn by Leonardo da Vinci?

It’s difficult to give an exact age, but we can estimate.


The Mona Lisa, painted by Leonardo da Vinci, depicts Lisa (Gherardini) del Giocondo, the third wife of a wealthy merchant in Florence, Italy.


We know she was born in 1479. We also know the portrait itself had to have been painted sometime between 1503 and 1506. da Vinci, who had been a mapmaker in the Italian military, only returned to Florence in 1503, and by 1506 he had already left for Milan. Although we’re not quite sure how long the painting took, the model would have only needed to be present in the beginning. Assuming that Lisa del Giocondo sat for the portrait in 1503, this would put her age at around 24.

Why does Darnay pay to have an escort to Paris in Charles Dickens' A Tale of Two Cities?

Darnay needs an escort for his safe passage to Paris because he has been born a French aristocrat, and a particular one, at that.


In Book the Third, Chapter I, Dickens depicts every village and every town gate as having its own band of citizen-patriots with their muskets in "a most explosive state of readiness." These "red-caps" or sans-culottes,* as they were called, are the revolutionaries, who like Madame Defarge, have registered their enemies in lists of their own and often exercise a capricious judgment when stopping the "comers and goers."


Perhaps because he is a particular emigrant, Darnay is spared immediate death, and is, instead, awakened in the night and told that he must pay for escorts. The two men who escort him allow Darnay to ride his own horse, but they have a line tied to its bridle which they hold.


When they reach the town of Beauvais, the main reason for Darnay's escorts then becomes apparent. "Down with the emigrant!" is a shout from many; a farrier curses him, "Judged!....Aye, and condemned as a traitor." Hearing him, the crowd shouts its approval, so the escorts and the postmaster hurry Darnay's horse into a yard and shut the gates against the rushing crowd.


Further in the narrative, as Darnay is escorted to Paris, he moves from being a "free traveler and French citizen" to becoming a prisoner handed over to Monsieur Defarge. As he stands before a desk on which registers lie, Darnay hears, "Is this the emigrant Evremonde?" After this, he is questioned and conducted to La Force where he is handed over to the jailer with a note reading "in secret." Darnay is placed in a cell by himself. 
It is, thus, apparent that Darnay has had two particular escorts and has been turned over to M. Defarge because his name has been knitted into her list, and his is a special name.


* sans-culotte (a name given to the revolutionaries) = without shorter pants. It was the aristocracy who wore the shortened pants (culottes) with stockings

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