.... especially in the United States Forest Service, but the ecological effects of prescribing a fixed burning regime on large tracts of land are increasingly being questioned (Lyons, 1985, 3). To an ecologist, fire can be treated as just one of the many factors in an environment. It compares with droughts, floods, hurricanes and other physical disturbances because of the direct impact it makes on organisms. Unlike these physical factors, however, fire as a disturbing force is itself influenced by the biota, particularly the plant community. Alteration of the vegetation by any number of factors can influence the nature of a subsequent fire. Fire has similarities to grazing a ....

.... about the same size as earth possibly a little larger. It is also possible that Uranus and Neptune’s core is a liquid instead of a solid. also have about the same rotational characteristics and all have rings around them. Jupiter, the first of , reigns supreme throughout the solar system. Named after the Roman god Jove, the ruler of Olympus; Jupiter is the fifth planet from the sun and is also the largest planet in the Earth’s solar system. It is 318 times more massive than Earth and is two thirds of the planetary mass in the solar system. Jupiter’s surface, unlike earth, is gaseous and not a solid. It is about 90% hydrogen and 10% helium with traces of methane, amm ....

.... known as a dry spell, or partial drought. A partial drought is usually defined as more than 14 days without a notable amount of precipitation, onthe other hand a drought may last for years. tend to be more severe in some areas than in others. Catastrophic generally occur at latitudes of about 15°-20° and in areas bordering the permanently arid regions of the world. Lands that are permanent arid is a characteristic of those areas where warm, tropical air masses, in descending to earth, become hotter and drier. When a poleward shift in the west ocurrs, the high-pressure, anticyclonic conditions of the permanently arid regions hit each other on areas that are normally used ....

.... specific diseases. It can also be used to create organisms that function as biological factories manufacturing hormones and other biological compounds used to treat human diseases. For example, bacteria can produce the hormone insulin, which is used to treat diabetes. Such uses of transgenic organisms are widely referred to as genetic engineering. Transgenic organisms have proved very useful in analyzing the function of gene products because a specific gene can be expressed in all the cells of a transgenic organism and the effect on the organism's development and function can then be monitored. It is also possible to use transgenic procedures to produce animals in which a s ....

.... of the AIDS virus is uncertain, but it may have originated in Central Africa. The first AIDS patients in the Americas and Europe were almost exclusively male homosexuals. Later patients included those who used unsterilized intravenous needles to inject drugs; hemophiliacs (persons with a blood-clotting disorder) and others who had received blood transfusions; females whose male sexual partners had AIDS; and the children of parents with AIDS. However since 1989, heterosexual sex was found to be the fastest growing means of transmission of the virus, with 90 percent of the new cases coming from heterosexual sex. How AIDS Is Spread AIDS is transmitte ....

.... and impulsivity. Unlike similar behaviors caused by emotional problems or anxiety, ADHD does not fluctuate with emotional states.” About 1-3% of the school aged population has the full ADHD syndrome, without symptoms of other disorders. Another 5-10% have partial ADHD syndrome with one or more other problems, such as anxiety or depression.(CHADD) Gender and age affect the way the patients display their symptoms. Boys are more likely to have the disorder than girls. The symptoms of ADHD usually decrease with age, but those symptoms related with other similar disorders are said to increase with age. 30-50% of children with ADHD may display symptoms ....

.... and invade the blood stream, leading to death within 48 hours. Bacillus Anthracis is classified as a harmful, pathogenic bacterium. There is a vaccine for Anthrax in humans, but it produces no significant immunity. The vaccine is given primarily to people who work with livestock or in other businesses where workers must handle animal carcasses. The livestock version of the vaccine is very effective, however. The vaccine for both animals and humans is composed of sublethal amounts of toxin that induce formation of protective antibody. Frequent boosters are necessary to maintain resistance to Anthrax. Bacillus Anthracis spores also may live in soil for years. The only way to ....

.... mass can be disregarded in the equation because it has none; this is because an ideal gas is said to be a particle and particles do not have any mass. Ideal gases obtain no volume unlike real gases which obtain small volumes. Also, since ideal gas particles excerpt no attractive forces, their collisions are elastic. Real gases excerpt small attractive forces. The pressure of an ideal gas is much greater than that of a real gas since its particles lack the attractive forces which hold the particles back when they collide. Therefore, they collide with less force. The differences between ideal gases and real gases can be viewed most clearly when the pressure is high, ....