... with an average age of onset of sixteen years for females and twenty-two years for males. Type II affects people over sixty years of age. There are several immunological abnormalities associated with psoriasis. Early psoriatic changes occur in advancing lesions before the accumulation of inflammatory cells. These changes are mediated by activated CD4+ T lymphocytes and can be detected before visible pathology to the skin occurs. Activated T lymphocytes exhibiting an increase in HLA-DR and IL-2R can be seen in close proximity to Langerhans cells in the dermis before lesion formation. Since Langerhans cells are antigen presenting cells, activation ...
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... the Earth's surface to warm up to a dangerous degree. Since 1850 there has been a mean rise in global temperature of approximately 1° C (approximately 1.8° F). Even a limited rise in average surface temperature might lead to at least partial melting of the polar icecaps and hence a major rise in sea level, along with other severe environmental disturbances. An example of a runaway greenhouse effect is Earth's near-twin planetary neighbor Venus. Because of Venus's thick CO2 atmosphere, the planet's cloud-covered surface is hot enough to melt lead. Water vapor is an important "greenhouse" gas. It is a major reason why humid regions experience less cooling a ...
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... clouds. A cirrus cloud appears in delicate, feather-like bands that are not attached to each other, and is usually white with no shading. Cirrocumulus clouds appear like very small round balls or flakes. The cirrocumulus clouds sometimes form a pattern of a buttermilk sky. The cirrostratus clouds sometimes form tangled webs or thin whitish sheets. A large ring or halo is sometimes seen around the sun or moon when the cirrostratus covers the sky. The middle layer of clouds range in altitude from 6,500 to 23,000 feet. The altocumulus, altostratus, and nimbostratus clouds are found in the middle division. The altocumulus clouds are more rounded and p ...
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... first prayer called Fagr (streak of light) must take place between when the first light of the day is seen until 10:00 am. The second prayer called al-duhr (noon prayer) should be done between noon and the next prayer which is the asr (afternoon) prayer. The fourth prayer of the day is the Maghrib (sundown) prayer. The last prayer is called the Isha (night) prayer. If any prayer is missed at any time of the day for any reason, it can be made up at a later time. The next pillar of Islam is al-sowm (the fast). Muslims must fast during the Islamic month of Ramadan. Muslims engage in this practice in order to gain endurance and compassion for the poor. The four ...
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... are generally lower in the western United States than in the eastern United States. This chart shows that not all fish, shellfish, or their food insects can tolerate the same amount of acid: Generally, the young of most species are more sensitive than adults. Frogs may tolerate relatively high levels of acidity, but if they eat insects like the mayfly, they may be affected because part of their food supply may disappear. As lakes and streams become more acidic, the numbers and types of fish and other aquatic plants and animals that live in these waters decrease. Some types of plants and animals are able to tolerate acidic waters. Others, however, are acid-sensitiv ...
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... most notably the World Wide Web (WWW). With increased penetration of computers, particularly multi-media computers equipped with CD-ROM drives and modems, subscription-based services such as America Online (AOL), Prodigy, and Compuserve, where consumers are able to check airline flight schedules and make reservations, purchase a wide variety of products, and discuss product performance with other consumers, are becoming very popular. Households in Chicago and San Francisco can purchase groceries from home using computer software marketed by Peapod, Inc. This latter service allows consumers to search within a product category using attributes such as price ...
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... dies. The other kind is called bipolar or manic depressive illness, it is recognized by alternating depressed and manic episodes. This is an actual brain disfunction. In the major depression or the depressed phase of bipolar illness, a depressed mood predominates, even though the patient may not be aware of feeling sad. Typically, he or she loses all interest in activities. Symptoms include sleep disturbances, not able to concentrate or to make decisions, loss of appetite or greatly increased appetite, slowed thinking and decreased energy feelings of worthlessness, guilt, hopelessness, diminished sexual interest, and recurrent thoughts of suicide and death, somet ...
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... cancer and eventually death to those exposed to high levels of radiation. Even the government declared that nuclear powers were safe and efficient. The truth is that accidents do happen at nuclear power plants and at other facilities all the time. An accident at a nuclear power plant has the potential to be much more harmful than an accident at a coal or gas plant because of the radiation that could be released. An example of this is Three Mile Island in Pennsylvania where there was a partial core meltdown in march of 1979 caused large amounts of radiation to be released into the atmosphere. Accidents involving US nuclear power plants are very rare. This ...
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... Corners area. In a dry area, the disease’s incubation is somewhat longer, making the chances of contracting it somewhat higher. In places such as woodpiles and sheds where there is little air circulation to move off the virus, it can linger for a sizeable duration of time. The best method of fighting the hanta virus is prevention. By controlling the rodent population and preventing them from entering houses and sheds, the risk of infection can be lowered. Furthermore, educating those in high-risk areas of the signs of the disease and what to do about them significantly lowers the likelihood of death. The virus cannot spread from human to human even during ...
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... just a ball of molten material. Since then, parts of the Earth have cooled forming the solid crust-mantle. This process has been occurring for roughly about 3.8 billion years. The mantle is about 2900 km. thick, which lies above a layer of molten magma that still exists today. The immense heat from the magma (approximately 2700(C) causes convection in the mantle (Figure 1). Convection is caused by non-uniform temperature in a fluid and density differences. This continuous convection is the cause of plate movement. Each complete cycle, called a convection cell, drives the plate in the direction of the cell. How does a 'solid' mantle move? The mantle may be ...
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