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Pheromones

... are a class of compounds that insects and animals produce to attract members of their own species. These compounds are secreted by the body in very small amounts but are never-the-less effective in producing instinctive behavior when detected by the nose. In insects and animals, most sexual and social behavior is controlled by pheromones. Humans have used perfumes for thousands of years, but there is a basic difference between perfume and pheromones. Pheromones are produced by the body and usually do not smell at all pleasant, whereas perfum ...

Number of words: 481 | Number of pages: 2

Gas Laws (cemistry)

... solids and the liquids Pressure and the Law of Boyle Quantitative measurements on gases were first made in a rational manner by the English chemist Robert Boyle (1627 - 1691). The instruments used by Boyle to measure pressure were two: the manometer, which measures differences in pressure, and the barometer, which measures the total pressure of the atmosphere. A manometer is simply a bent piece of tubing, preferably glass with one end closed. When the liquid level in both arms is the same, the pressure of the sample of gas inside the c ...

Number of words: 2458 | Number of pages: 9

History Of The Aircraft Propeller

... the helicopter rotor. The first idea of a propulsive airscrew, however, belongs to J.P. Paucton, a French mathematician. Paucton envisioned a flying machine that had two airscrews, one for propulsion and the other for sustaining flight. The idea of using an airscrew for propulsion was utilized during the late 1700's to early 1800's. Only after experimentation did the inventors conclude that more propulsive power could be obtained by merely straightening out the surface of the airscrew blades. Attempts to utilize the "straight blade" propell ...

Number of words: 1521 | Number of pages: 6

The Study Of Akali Metal Contamination In Road Side Soil

... application of magnesium, calcium, and sodium chloride salts to the surface of the road. When the ice melts it dissolves these salts and causes them to migrate into soil that is adjacent to the pavement. Over time, the accumulation akali metal salts can change the chemical profile of the soil which can lead to detrimental biological effects. Flame atomic spectroscopy provides a technique that can quantify metal concentrations in the extracts of the soil samples and consequently examine the relationship between distance from the point of roa ...

Number of words: 1187 | Number of pages: 5

Air Pollution

... is not stopped, it will cause life on earth as we know it to cease. Air pollution causes a number of health and ecological problems. It causes health problems like cancer, emphysema, and asthma. It also causes the depletion of the ozone layer which results in global warming and melting of the ice caps. Up until the industrial era, the air was fairly clean. The use of smokestacks and the burning of fuels put many pollutants in the air during this period of time. The increased use of fossil fuels today also builds on this. There have ...

Number of words: 512 | Number of pages: 2

Lichens

... arrangement are almost never found growing separately, but the algae are found growing free. There are about 15,000 different kinds of distributed worldwide. They are especially suited for growth in harsh regions, where few plants can survive. They grow farther north and south than most plants, as well as higher on mountains. One unusual type grows completely submerged in the cold coastal waters of Antarctica. Some inhabit the Earth's driest deserts, where they grow almost entirely underground and obtain light and moisture through small o ...

Number of words: 571 | Number of pages: 3

Lymphoma

... is called and Hodgkin’s type is called Hodgkin’s disease. Hodgkin’s disease is different from non-Hodgkin’s disease in that Hodgkin’s disease has a Reed-Sternberg cell present in the areas infected with the cancer. Hodgkin’s disease occurs mainly in people between 15 and 40 or over 55. Non-Hodgkin’s type cancer is much more common than Hodgkin’s disease. Non-Hodgkin’s is a group of over 29 types of . These are classified by the US National Cancer society as aggressive or fast m ...

Number of words: 1532 | Number of pages: 6

Human Health

... provides the products has been doing business for over 16 years, and they had $1.2 Billion in sales last year. They are the foremost manufacturer of nutritional and weight-loss products. The company is based in Southern California, and is doing business internationally in 32 countries. An article in the November 1995 issue of CONSUMER REPORTS published a list of herbs that might help and herbs that cause harm. Almost all of the herbs that are helpful and none of the herbs that cause harm are in our products. The products co ...

Number of words: 1011 | Number of pages: 4

Acupuncture 2

... used so much in this country, but there are many places acupuncture is used in the United States. Acupuncture is used in the treatment of a wide variety of medical problems. It is used for ear, nose, and throat disorders, respiratory disorders, Gastrointestinal disorders, Eye disorders, and Neurological and Muscular disorders. The needles used in acupuncture are usually only inserted from 1/4 to 1 inch deep into the skin. There is usually no pain in acupuncture. Usually if any pain it is only mild. Most of the needles now used ...

Number of words: 475 | Number of pages: 2

Canabis

... plant's fibers to make rope and canvas. It was also used in making clothing because of it's durability. These uses fit in with the social climate of the time, because the main focus was on survival rather than for psychoactive purposes. During the prohibition, marijuana was widely used because of the scarcity of alcohol. Prohibition was repealed after just thirteen years while the prohibition against marijuana lasted for more than seventy five years. This double standard may have resulted from the wishes of those in power. Alcohol pro ...

Number of words: 617 | Number of pages: 3

Comets

... away small bits of the little solid material the comet has. Another feature of a comet is a long tail. This is caused by materials breaking off and expanding. They expand into an enormous escaping atmosphere called the coma. This becomes at least the size of our planet. With the comet going so fast, these materials are forced behind the comet, forming a long tail of dust and gas. Comets are cold bodies. We see them only because the gases they are composed of glow in the sunlight. All comets are regular family members of the solar syst ...

Number of words: 1865 | Number of pages: 7

About All Sharks

... in length. PRISTIOPHORIFORMES: These shark are known as the saw shark. This order has only has one family PHISTOPHORIFORMES which contains five species. These sharks are easy to recongnize due to the fact that they posses an ellongated blade like snout that is lined with sharp teeth along the edges, thus, the name saw sharks. SQUALIFORMES: The order possesses three family which consist of about 82 species. These sharks are characterized by their slender, cylinder-shaped bodies, long snouts with shortened mouths. HEXANCHIFORMES: The He ...

Number of words: 761 | Number of pages: 3

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