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Search results 4481 - 4490 of 14167 matching essays
- 4481: H.i.v. About Aids
- ... confronted (this idea being derived from the evolutionary theory). For example, its genetic makeup changes constantly; a high mutation rate increases the probability that some genetic change will give rise to an advantageous trait. This great genetic variability stems from a property of the viral enzyme reverse transcriptase. As stated above, in a cell, HIV uses reverse transcriptase to copy its RNA genome into double-strand DNA. The virus mutates rapidly ... billion new viral particles are produced in an infected patient each day, and in the absence of immune activity, the viral population would on average double every two days. With the knowledge of HIV s great evolutionary potential in mind, Nowak and his colleagues conceived a scenario they thought could explain how the virus resists complete eradication and thus causes AIDS, usually after a long time span. Their proposal assumed that ...
- 4482: Gold And Its Uses.
- Gold's great virtues of malleability, ductility, reflectivity, resistance to corrosion and unparalleled ability as a thermal and electrical conductor mean it is used in a wide variety of industrial applications consuming close to 300 tonnes annually. Gold ... over 30 open-pit operations, of which the largest is Gold strike with an expected average production of over 50 tonnes per year. Historically, Russia was one of the earliest sources of gold. Alexander the Great conquered Armenia in 33 BC in order to obtain its gold, but a discovery in the Urals in 1774 triggered the modern industry. By the 1840s Russia was the leading producer, until eclipsed by the ...
- 4483: Geothermal Energy
- ... possibility for a human resource. I will be discussing some of these issues, questions, and problems. In the beginning when the solar system was young, the earth was still forming, things were very different. A great mass of elements swirled around a dense core in the middle. As time went on the accumulation elements with similar physical properties into hot bodies caused a slow formation of a crystalline barrier around the ... the hot rocks. The heated water is then pumped from the underground reservoir to the surface. This system is not as effective as others because the temperature that the heated water reaches is not very great. Geopressured geothermal systems are similar to hydrothermal systems. The only difference is the pressure of the high temperature reservoir. Geopressured geothermal systems may be associated with geysers. Some geopressured geothermal systems reach pressures of fifty ...
- 4484: Geography Reading Project (timeline)
- ... one of the reason I feel that the language has evolved to what it has today. Today there is a upper class a middle class a low middle class and a lower class. We have great variety between the groups there is not a huge distinction between the classes unlike in the story where the class distinction was very great there was no middle or lower middle classes there was only the rich and the poor nothing else. The building materials back then were mostly stone cut in to cube shapes to aid building, timber ...
- 4485: From Legend To Science The Health Benefits Of Tea
- From Legend to Science: the Health Benefits of Tea Throughout the world, tea and coffee rival each other as mankind's most popular brewed beverages. For thousands of years, however, tea has had one great advantage over coffee: it is believed to have a wide range of medicinal properties. In his book, Tea in China, John C. Evans states that กงif tea had not possessed a medical reputation, the beverage ... fruits and vegetables. They make blood cells called platelets less prone to clotting, and they also act as antioxidants, countering the artery-damaging potential of highly reactive free-radical chemicals.กจ (Mollins 10) One of the great values of the Dutch study is that it is the first one to show that the flavonoids found in tea can protect from stroke as well as heart attack. In a very detailed analysis of ...
- 4486: Effects Of Drugs On Pregnet Women
- ... and endanger the fetus within them. These harmful drugs include cannabis, cocaine, heroine, and speed. Drugs can cause a variety of adverse affects on the fetus. These effects include lower birth weights, inadequate fetal growth, depression of the central nervous system, and possible impairment of fetal brain development. Lots of these drugs increase the pregnant women s heart rate and blood pressure, which decreases the amount of blood the mother gives ... Benzodiazepines rapidly cross the placenta barrier and enter the fetal circulation. Blood levels in the fetus equal that of the mother s within one hour of taking the Benzodiazepine pill. Some Benzodiazepines may cause respiratory depression, hypotonia, lethargy, and poor feeding. Pregnant women should not take aspirin while they are still pregnant. If you take lots of aspirin while your pregnant, it could cause a severe hemorrhage in the baby. Doctors ...
- 4487: Effect On Pot
- ... necessarily indicate an extreme health hazard. For example, roasted coffee contains 800 volatile chemicals, of which only 21 have been tested on rodents, and of those, 16 were carcinogenic. Coffee has never been considered a great cancer-causing substance, though. Cannabis has also been known for its many therapeutic uses, including the treatment of open angle glaucoma, asthma, and the nausea associated with chemotherapy. It has also been described as a ... physical effects, yet are as accurate today as they were 100 years ago. Following is an early account of its intoxicating properties made by Dr. John Bell in 1857: "I had taken the drug with great skepticism as to its reputed action, or at any rate with the opinion that it was grossly exaggerated, and I accordingly made up my mind not to be 'caught napping' in this way again, and ...
- 4488: Eagles 2
- ... wingspan of about 6 1/2 feet. Females are larger, some reaching 14 pounds and having a wingspan of up to 8 feet. This striking raptor has large, pale eyes; a powerful yellow beak; and great, black talons. The distinctive white head and tail feathers appear only after the bird is 4 to 5 years old. Bald eagles are believed to live 30 years or longer in the wild, and even ... areas. Nests are often reused year after year. With additions to the nests made annually, some may reach 10 feet across and weigh as much as 2,000 pounds. Although bald eagles may range over great distances, they usually return to nest within 100 miles of where they were raised. Bald eagles normally lay two to three eggs once a year and the eggs hatch after about 35 days. The young ...
- 4489: Ecstasy The Hug Drug
- ... completely different prescription. Teenagers who attend all night dance parties have a "mind-blowing time," according to U.S. Customs Commissioner Raymond Kelly, "primarily use ecstasy". The drug breaks down communication barriers and allows a great recipe for intimate contact, which a lot of young people today strive for. The positive feelings that people report are very similar to that of Prozac (anti-depressant drug) and fenfluramine. MDMA is usually taken ... healthy recovery. Eating and drinking a substantial amount will only increase homeostasis. Ecstasy, once a diet drug, is now commonly used among young adults as the normal thing to do at parties. This drug maybe great for awhile, but them comes the after effects which can last quite a long time. Quoted by a famous hound McGruff, " Don't to Drugs."
- 4490: Ecology Asssignment
- ... forever. Fossil fuels will run out eventually, natural gas will run out also and so will timber and forest. Because of this, these resources must be used sparingly. Alternate energy sources and recycling are a great way to do this. We must be aware that we are not the only ones on this planet and we must set aside some for the other animals of this world. 12. Brief definitions of ... if thjis is a fact the sea level will rise by 50 centimetres, and obviously more Global Warming will follow with the sea level to rise more. The possible consequences of Global Warming are so great, the world's top scientists have urged immediate action and have called for international cooperation on the problem.
Search results 4481 - 4490 of 14167 matching essays
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