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Search results 4191 - 4200 of 14240 matching essays
- 4191: Diffraction And The Debye-Scherrer Camera
- ... the path difference between the two waves is dsinq = ml where m is an integer and q is the angle that the bright spot makes with respect to the horizontal axis of the screen and d is the spacing between the slits. Destructive interference occurs when the path difference is a multiple of half the wavelength i.e. dsinq = (m+1/2)l where m is an integer. Another curiosity of ... angle of q on one of the planes. This x-ray beam is reflected by the plane on top and the plane just beneath it. The beam reflected by the bottom plane travels 2dsinq where d is the spacing between the atomic planes. So constructive interference occurs when 2dsinq = ml where m is an integer. This is known as Bragg's Law. As will be shown later, this equation is used ... previously there were uniform lines. Another important use of the powder method is stress determination in metals. The unit cell in a strained metal is slightly altered. This causes a difference in the atomic spacing d which affects the powder pattern. So accurate measurements of stress can be obtained by measuring the difference in the angles q before and after straining. So we see that humankind has made great use ...
- 4192: Green Fluorescent Protein Purification
- ... also to also show which region of the TRb1 protein was essential in this interaction between hormone and protein. An analysis of TRb1’s amino acid sequence indicated a possible nuclear localization signal in domain D (Lys184-Arg185-Leu186-Ala187-Lys188-Arg189-Lys190). So two mutants of TRb1 in which domain D was altered were subjected to the same studies as the GFP- TRb1 protein. These studies involved growing CV1 cells transfected with the GFP- TRb1 expression vector in a T3-containing or T3-depleted medium. The ... The cells transfected with a higher concentration of GFP-TRb1 plasmid showed no difference in nuclear/cytoplasmic ratio. Also, the results from the tests involving the mutants of GFP- TRb1 support the hypothesis that domain D is indeed a nuclear localization signal in TRb1. Approximately 70-80% of the cells containing the GFP-mutant TRb1 showed that the protein remained in the cytoplasm even in the presence of T3. (the ...
- 4193: A Study of B.F. Skinner and Behaviorism
- ... Hamilton College in 1926. After becoming interested in the works and studies of John B. Watson and Ivan P. Pavlov, he studied with animal learning and functions of the nervous system. He received his Ph.D. in behavioral psychology at Harvard in 1931. In 1936, he then worked as part of the faculty at the University of Minnesota. A few years later in 1939 to 1945, during World War II, he ... should use any other alternative to reinforce. References Burger, Jerry M. (1997). Personality Fourth Edition. Pacific Grove, CA: Brooks/Cole Publishing. Cattell, Raymond B. and Ralph Mason Dreger. (1977). Handbook of Modern Personality Theory. Washington D.C.: Hemisphere Publishing. Hergenhahn, B.R. (1980). An Introduction to Theories of Personality. Prentice-Hall Incorporated: Englewood Cliffs, NJ Nye, Robert D. (1992). The Legacy of B.F. Skinner: concepts and perspectives, controversies and misunderstandings. Pacific Grove, CA: Brooks/Cole Publishing. Skinner, B.F. (1948). Walden Two. New York, NY: MacMillan Company. Skinner, B.F. (1953). ...
- 4194: Simple Machines
- ... surfaces that are touching each other. What do we use machines for? Machines are used for many things. Machines are used in everyday life just to make things easier. You use many machines in a day that you might take for granted. For example a simple ordinary broom is a machine. It is a form of a lever. Our country or world would never be this evolved if it wasn't for machine. Almost every thing we do has a machine involved. We use machines to manufacture goods, for transportation, ect. In the W=F*d equation the trade of between force and distance is as you use a machine the force goes down and distance goes up. If there was no friction they would be equal and trade. There are ...
- 4195: Earthquakes
- ... 90 percent of the city's buildings. One of the clues that led to this prediction was a chain of low- magnitude tremors, called foreshocks, that had begun about five years earlier in the area.” (Day 1988) Other potential clues being investigated are tilting or bulging of the land surface and changes in the earth's magnetic field, in the water levels of wells, and even in animal behavior. A new ... basis of such measurements the U.S. Geological Survey, in April 1985, predicted that an earthquake of magnitude 5.5 to 6 would occur on the San Andreas fault, near Parkfield, California, sometime before 1993.”(Day 1988) Many unofficial predictions of earthquakes have also been made. In 1990 a zoologist, Dr. Iben Browning, warned that a major quake would occur along the New Madrid fault before the end of the year ... Predicting the Effects of Large Earthquakes"; SIRS 1994 Applied Science, Article 17, Sept./Oct. 1993, pg. 7-17. Butler, Steven 1995, "Killer Quake"; SIRS 1995 Earth Science, Article 47, Jan. 30, 1995, pg. 38-44. Day, Lucille, 1988, "Predicting The Big One"; SIRS 1989 Earth Science, Article 5, Summer 1988, pg. 34-41. Monastersky, R. 1995, "Electric Signals May Herald Earthquakes"; Science News, v. 148, Oct. 21 ,1995, pg. 260- ...
- 4196: Cryogenics and the Future
- ... K. However, almost all elements and compounds have Tc's between 1 K and 15 K (or -457.68 (F and -432.67 (F) so they would not be very useful to us on a day to day basis[McClintock 208- 226]. Then in 1986, J Gregore Bednorz and K. Alex Muller discovered that an oxide of lanthanum, barium, and copper becomes superconductive at 30 K. This discovery shocked the world and stimulated ... development of the cryogenic scalpel which can deaden or destroy tissue with a high degree of accuracy, making it possible to clot cuts as soon as you cut them. So in theory you could one day have surgery without having to deal with any blood. Another field is Cryopumping. Cryopumping is the process "of condensing gas or vapor on a low-temperature surface."(Vance 339) This is done by extracting ...
- 4197: Minerals
- ... calcium is stored in your bone's. It also helps with mussel contraction. Milk products such as milk, cheese and other stuff it the primary source for calcium. You should have about 1000mg's a day. Magnesium is also another important mineral. This mineral is in most foods. It is very important in containing healthy mussel cells. It also helps in forming bones. Sodium is another kind of mineral. Sodium is ... is needed to form pigments in red blood cells. These cells transport the oxygen we need. men have more iron in there blood stream then women. You should have about 18 mg of iron each day. Zinc is required to keep your blood sugar level controlled. You also need to so you can taste and hear properly. It also helps to heal cuts. You should have about 15 mg per day of zinc. Boron is a mineral that helps keep strong bones. It affects calcium and magnesium. This also helps out so you have proper membrane functions.
- 4198: Water Pollution: Is it as big of a problem as we think?
- ... originate from? Mainly form domestic, industrial, groundwater, and meteorological sources. And these are most commonly known as Domestic Sewage, Industrial Waste, Infiltration, and Storm-Water Drainage. Domestic Sewage: This type of wastewater results from peoples day to day activities, such as bathing, body elimination, food preparation, and recreation, averaging about 227 liters ( about 60 gallons ) per person per day! Industrial Wastewater: The quantity and character of industrial wastewater is highly varied, depending on the type of industry, the management of it's water usage, and the amount of treatment the water receives before ...
- 4199: Time To Change
- ... quite a time now. It is overwhelmingly populated with both ignorant and lazy people. In effect, not much is being done to prevent this deterioration. For instance, we are killing off vital animal populations every day. We have caused the extinction or endangerment of numerous species for absolutely no reason other than selfishness. An example is the poaching of elephants. We are killing these animals only for our own wealth. We ... on the ozone to defend us from harmful UV rays. Finally, we have a major impact on the degeneration of natural resources. Millions of gallons of oil, coal, and other valuable resources are wasted each day. These are just a few of the human disruptions to nature available to our knowledge. We are conscious of many more, and there are probably others that we are not aware of. If we do ... Earth-Firsters' have some good propositions, but most of them are not practicable. We need to set standards and ideals that can realistically be accomplished. It is not possible to change the world in one day. Instead of killing ninety percent of the population, we might control the number of offspring allowed to each individual. This approach would more likely be sustained. In order to conserve the earth, we should ...
- 4200: Privately Owned Gasoline Powered Vehicles Should Be Limited
- ... and, therefore, people start honking their horns and yelling at others. This produces a polyphonic sound that is not very pleasing to anyone, especially those in the traffic jam who have already had a stressful day at work. Obviously, this is not the fault of the automobile itself, but the fault of the owners. If there were a limit on the number of cars allowed on such public roads as Fifth ... emissions are the single largest source of lead in our environment, and that high levels of lead in young children can cause brain damage, mental retardation, kidney disorders, and interfere with the processing of Vitamin D(Applebee 2; Gurman 2). Because of the preponderance of unleaded fuel on the market, the amount of lead in the air has decreased. But does this mean that the chance of lead poisoning from car ...
Search results 4191 - 4200 of 14240 matching essays
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