.... able to fully comprehend and analyze this question we must first ascertain what HIV is, how the body attempts to counter the effects of viruses in general, and how HIV infects the body. Definition HIV is the virus that causes AIDS. HIV is classified as a RNA Retrovirus. A retrovirus uses RNA templates to produce DNA. For example, within the core of HIV is a double molecule of ribonucleic acid, RNA. When the virus invades a cell, this genetic material is replicated in the form of DNA . But, in order to do so, HIV must first be able to produce a particular enzyme that can construct a DNA molecule using an RNA template .....

.... There is local evidence that improved sewage treatment means improvement in water quality. Monitoring on a national level showed that large investments in point-source pollution control have yielded no statistically significant pattern of improvement in dissolved oxygen levels in water in the last 15 years. It may be that we are only keeping up with the amount of pollution we are producing. (Knopman, 1993) The early biosphere was not pleasant for life because the atmosphere had low levels of oxygen. Photosynthetic bacteria consumed carbon dioxide and produced simple sugars and oxygen which created the oxygen abundant atmosphere in w .....

.... this feature should not have been considered a constraint on theories of the origin of the solar system. The many theories concerning the origin of the solar system that have been advanced during the last three centuries can be classified as either dualistic or monistic. A common feature of dualistic theories is that another star once passed close to the Sun, and tidal perturbations between the two stars drew out filaments of gas from which the planets condensed. Theories of this type encounter enormous difficulties in trying to account for modern information about the solar system, and they have generally been discarded. By contrast, .....

.... atmosphere. The exhaust is extremely toxic to human beings. But why do we do continue to drive these walking time bombs. Some people will say it is progress, but the majority drives it for the convenience. Why walk four miles in four hours when you can drive the same miles in four minutes? Another popular source of waste is the post-consumer market. American citizens throw away millions of tons of garbage each year, and this trash has to go somewhere. While there are projects underway to clean and reuse this refuse most of it gets dumped into huge landfills. These landfills are disgusting festering blisters on our country's landscape. But p .....

.... and will continue to do so unless a new solution is devised. The vast popularity of anabolic steroids is due to their powerful strength and muscle building properties. Strength and portrayed strength (a large muscular physique) are two factors that are directly related to the inherent need that man has to exert dominance over other males. This can also be verbally, intellectually, physically, and aesthetically. In our society we have always praised the athletes that achieve the most amazing physical feats or that have achieved cosmetic perfection. Lets face it, having large muscles enhances confidence, strength, and physical attraction fr .....

.... past, mercury was used to make things like paper, put in paint and thermometers, and as an agricultural pesticide. The Minamata Disease is a good example of what could happen if mercury enters into the environment. In the mid 1950's, more than 100 Japanese were poisoned by fish that contained methyl mercury. The mercury came from industrial waste that had been dumped into the bay where the fish were caught. The mercury bioaccumulated up the food chain. The cats the were eating the fish showed the symptoms first. They began to act very strange; running into walls and acting like they were "in a trance." The people in the village develo .....

.... fossils which are to have been the bridge between a two familiar species are not yet found (Hitching p 3). Whatever the reason of belief or disbelief in Darwin's theories, he astounded the scientific world as well as the public and was able to convince many in the presence of a misguided past belief. This fact alone makes him one of the most important people of science ever. Charles Darwin was born in Shrewsbury-Shropshire, England on Feb 12, 1809 (GEA & RBi p 42). He was the fifth child in a wealthy English family with a history of scientific achievement with his paternal grandfather Erasmus Darwin who was a physician and a savant in .....

.... distantly related to the turkey. Instead, turkey vultures- along with their cousins in the United States, the black vulture of the South and East, and the nearly extinct California condor-belong to a group of raptors called New World vultures. Chromosome analysis shows that the New World vultures are actually more closely related to storks than to the vultures of Europe, Asia, and Africa. Turkey vultures are remarkably successful birds. They range everywhere from parts of Canada and much of the United States to South America. At home in deserts, prairies and woodlands, they have even settled close to people in a number of urban and su .....

.... climates three letters that describe that climate. The Koppen Climate Classification system is comparatively simple and is based on a triad of letter symbols. The first (capital) letter is the critical one; the A climates are humid and tropical; the B climates are very dry; the C climates are humid and mild; the D climates reflect increasing cold; and the E climates mark the polar areas. The first letter is followed by two more letters that further define the climate of that region. The second letter represents and explains the dry season: whether there is or isn't a dry season, whether it is a short or long dry season, and what sea .....

.... which is rare.)2 The other chromosome is likely to be normal and she can therefore compensate for this defect. There are two types of haemophilia, haemophilia A and B. Haemophilia A is a hereditary disorder in which bleeding is due to deficiency of the coagulation factor VIII (VIII:C)3. In most of the cases, this coagulant protein is reduced but in a rare amount of cases, this protein is present by immunoassay but defective.4 Haemophilia A is the most common severe bleeding disorder and approximately 1 in 10,000 males is effected. The most common types of bleeding are into the joints and muscles. Haemophilia is severe if the factor VI .....