Abstract
This paper examines the dangers of the notorious chemical DDT and shows why it should be banned by the year 2007, as environmentalist groups have aimed to do. The paper covers issues relating to the chemical including a growing resistance to its use, effective alternatives and the extent of its environmental destruction.

From the Paper
"The environmental damage that DDT causes is enough in itself to justify a total ban. DDT is a very persistent chemical and because if its molecular structure breaks down very slowly within nature. There are rough estimates that the half-life of DDT is around 12-15 years depending on the climate it is exposed to. This is partly why it is so dangerous in the environment. Another factor is that DDT is able to travel great distances, and is found every where throughout the globe. This is a strange and disturbing discovery because some places have never been sprayed before, such as Antarctica and the ocean bottoms. The spraying of DDT has unintentionally killed some main predators of the mosquito. Dragonfly larva hunt mosquito larva in puddles and stagnant ponds and also the adult dragonfly will hunt adult mosquitoes further reducing their numbers. DDT has worked in the past but as it destroyed fragile ecosystems it has now increased mosquito numbers. DDT is also the linked chemical responsible for the decline in the population of the Bald eagle and the Peregrine falcon. These two species are at the top of the food chain, thus their prey usually have been exposed to DDT."

Tags:bioaccumilation, malaria, Bacillus, Thuringiensis

Abstract
This paper explains that, while many poisonous vapors may be present during a fire, carbon monoxide has characteristics that make it particularly dangerous because it causes oxygen deprivation. This author suggests that the solution for firefighters is a piece of equipment called a SCBA (self-contained breathing apparatus), which includes a face mask, bottled air supply, a regulator to control pressure, and a harness to carry the apparatus on the firefighter's back. The paper stresses that fire departments must replace all their breathing apparatus at once so they are standardized, and every firefighter has the same level of protection.

From the Paper
"When SCBA devices were first developed, they were sold as units. Today, however, most departments buy each piece of apparatus separately. This means that each firefighter has his or her own face mask, which reduces the chance of contagious illnesses being spread because multiple users used the same mask while one of them was coming down with something. In addition, departments need to buy extra masks in case masks get damaged. They also need extra bottles, because one bottle per firefighter may not be enough air, making a bottle exchange necessary. This makes it even more important that components be compatible with one another."

Tags:oxygen, deprivation, apparatus, standardized, protection

Abstract
The paper begins by purifying beef heart and ends with a highly-quantitative analysis of the results of attempting to isolate the enzyme lactate dehydrogenase. It contains every aspect of a detailed biochemistry lab report. The paper contains complex quantitative analysis with supporting statistics. It also has scanned photographs of the gel electrophoresis.

From the Paper
"Lactate dehydrogenase (LDH) is a crucial enzyme that regulates lactate levels throughout the mammalian body. Proper LDH function is essential for a number of important biochemical pathways, including the Cori Cycle and glycolysis among others. Without it, the glycolytic cycle would come to a halt due to diminished nicotinamide adenine dinucleotide (NAD+) reserves, and the buildup of lactate would ultimately result in lactic acidosis-a potentially fatal affliction."

Tags:bovine, centrifugation, chromatography, electrophoresis

Abstract
The writer explains that in this experiment, lysozyme was purified from egg white solution into 24 fractions using gel column chromatography. The writer points out that the odd-numbered fractions were then assayed in order to determine the enzymatic activity of lysozyme, while the even-numbered fractions were assayed for total protein content, using the Bradford protein assay procedure. The writer notes that lysozyme is one of the most well-known enzymes, being abundant in mucus, tears, and albumen (commonly known as egg white).
The writer concludes that the purification of lysozyme from egg white was only somewhat successful since the estimated value of the molecular weight, 14.25 kDa, is practically the same as the known weight of 14.3 kDa. However, the specific activity, calculated at 400 units/mg, was significantly less than the expected specific activity of 25 000 units/mg of protein.

Outline:
Abstract
Introduction
Materials and Methods
Results
Calculations
Discussion
Conclusion

From the Paper
"Lysozyme is itself composed of 129 amino acids, including four disulfide bridges and three sets of alpha helices. The enzyme's active site consists of a long groove that can hold as many as six polysaccharides. According to past experiments, specific activity of lysozyme from egg white is approximately 25 000 units/mg. This is the expected result for this experiment. However, one factor that influences the specific activity is the actual column and type of chromatography being used, since accuracy differs among the different types of chromatographies. Therefore, some are able to purify enzymes better than others, giving a more accurate specific activity. In addition to obtaining the specific activity, molecular weight of the enzyme can be determined by comparing the fraction in which most of the enzyme eluted with the fractionation range."

Tags:protein, egg, white, calculations, fractions

Abstract
Written in the style of a scientific review article for a journal, this paper compares the sanitation of wood versus plastic cutting boards. One of the main points emphasized is the ability of each material to prevent disease and bacteria.

From the Paper
"Every home, restaurant, and commercial food processing area needs a cutting and chopping surface. The materials these surfaces are made of have been under scrutiny as possible sources of foodborne illness. Most cutting board safety issues relate to cross-contamination, which results from processing ready-to-eat, non-cooked items (such as a salad) on a board previously used to cut animal products (1,6). The residue from the animal product inoculates the non-cooked food with pathogenic microflora. This residue, called biofilm, can be made of any number of food products, but the most common sources of pathogenic bacteria result from a biofilm deposit of chicken or beef extract ("juice")."

Tags:food, foodborne, health, illness, microbiology, preparation, public, sanitation, science

Abstract
Discusses benefits of ethanol as a renewable fuel & valuable resource. Fuel Cell technology. Internal combustion engine & exhaust problems of air pollution. Expansion of ethanol use. "Flex-fuel" vehicles. How fuel cells work. Effect on environment. Need to use ethanol as a fuel resource, not as a waste product.

From the Paper
"Ethanol, once considered a hazardous waste product of many industrial processes is no longer viewed in that light. Now, it is a valuable resource, much sought after, particular in fuel cell technology (Ethanol as a renewable fuel, 2000). The internal combustion engine gains its energy from the heat released during the combustion of the non-reacted working fluids, the oxidizer-fuel mixer (Britannica, 2000). The process occurs within the engine, and is a part of the thermodynamic cycle of the device. Useful work generated by the internal combustion engine results from the hot, gaseous products of combustion acting on moving surfaces of the engine, such as the face of a piston, a turbine blade, or a nozzle.


The most common example of the internal combustion engine, the intermittent combustion engine, is characterized by periodic..."

From the Paper
"THC has a range of physiological and psychological effects on the body. Typically, it produces a mild euphoric intoxication, a sense of well-being, alterations in sense of space and time. Quite likely, THC reduces anxiety and relaxes your tension while it intensifies your sense of sound, touch ,or taste, which often stimulates your appetite. It is suspected that THC has something to do with the Lateral Hypothalamus that control the appetite. For this reason, marijuana is employed as an appetite stimulant for patients with serious illnesses such as AIDS or terminal cancer who need to eat in order to survive. In addition, marijuana is also medically beneficial for pain relief, control of nausea and the treatment of asthma and glaucoma."

Tags:drugs, addictive, brain, cannabis, dopamine, fatty, hemp, metabolism, pot, receptor, reward, smoking, system, thc

Abstract
In this paper the author takes an in-depth look at Ethanol. The author makes mention of the different ways that it can be produced, its various characteristics, chemical composition and uses. The paper concludes with various arguments as to why ethanol has so many benefits and is so useful and argues why it may well be the ?fuel of the future?.

From the paper:

?Ethanol (ethyl alcohol, grain alcohol) is a clear, colorless liquid with a characteristic, agreeable odor. In dilute aqueous solution, it has a somewhat sweet flavor, but in more concentrated solutions it has a burning taste. Ethanol, CH3CH2OH, is an alcohol, a group of chemical compounds whose molecules contain a hydroxyl group, ? OH ? bonded to a carbon atom.?

Tags:fermenting, distilling, starch, sugar, manufacture, solvent, ethanol, acetaldehyde, ethanoic, acid, acetic, ch3ch2oh, molecules, chemical, hydroxyl, c2h4, ethene, h2o, steam, c2h5oh, yeast, zymase, enzyme

Abstract
This paper describes how greenhouse gases contribute to global warming. It begins by describing how greenhouse gases occur in the atmosphere. It discusses the importance of greenhouse gases and then describes what causes the harmful greenhouse effect. Finally, the paper describes the negative impact of the greenhouse effect on the Earth's environment.

From the Paper
"Greenhouse gases are components of the atmosphere that contribute to the warming of the Earth. Some greenhouse gases occur naturally in the atmosphere, such as: water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Human activities have increased the concentrations of these gases over time. The burning of fossil fuels such as oil, coal, and natural gas as well as other activities like deforestation, has lead to higher concentrations of Carbon dioxide. Live stock, paddy rice farming and losses of pipelines have lead to higher concentration of methane in the atmosphere. Activities, such as the use of nitrogenous fertilizers for agricultural reasons, and the burning of vegetation, have increased the nitrous oxide concentrations. The only greenhouse gas that is not directly affected by human activity is water vapor (Greenhouse gas, 2007)."

Tags:global, warming, fossil, fuels, methane

Abstract
An argumentative paper about the negative effects of human cloning. The author discusses the moral, ethical and religious issues that he believes outweigh the medical advances of cloning. Included is an overview of what cloning is and how it could effect society in the future.

From the Paper
"Human cloning is a controversial topic, the public regards it as inappropriate, while the leaders of certain scientific communities believe it is a sound practice that could be researched and used to benefit society. Human cloning is a form of genetic engineering, which most people consider morally wrong and, "Playing God". Through cloning an individual, you create an exact physical duplicate of that person, however, memories, personality and opinions are not recreated, and so differences do exist. Many pros and cons can be found when looking at cloning in depth, but it is my opinion that overall, it is not a beneficial procedure. There are just too many ethical issues that outweigh medical advances and prolonging life spans. A race has been started between scientists, everyone wants to be the first to clone an adult human, however with hopes of personal glorification and publicity, they have lost sight of the moral and religious issues at hand. Human cloning means creating a breed of people that have no flaws or imperfections, and since perfection does not exist, the clone could be nothing but a disappointment."

Tags:clones, ethics, genetics, twins