PAPER Topics

... seawater can fluctuate. Normally, the salinity is thirty-four to thirty-seven parts per thousand (ppt.), but on a particularly rainy morning, the salinity may decrease to something as low as thirty-two ppt. (Stuller 29). The mixing of freshwater and sea water forms a third type of water, known as brackish water. Brackish water can be found in a variety of mixing zones such as river deltas, freshwater title marshes, estuaries, fjords, and in the middle of the ocean (Stuller 30). To begin with, freshwater traveling towards the sea carries suspended particles. As the particles make contact with saltwater, an electrochemical reaction called flocculation takes place. The clay with ...

... or optical devices, which measured ozone concentrations through the depletion of UV light. However, the need to measure ozone concentrations from the surface at regular intervals, led to the development of the Dobson spectrophotometer in the 1960s. The British Antarctic Survey has the responsibility to routinely monitor stratospheric ozone levels over the Antarctic stations at Halley Bay (76°S 27°W) and at Argentine Islands (65°S 64°W). Analysis of ozone measurements in 1984 by a team led by John Farnam, made the startling discovery that spring values of total ozone during the 1980-1984 period had fallen dramatically compared to the earlier period between 1957-73. This decrease h ...

... chemical, optical and thermal properties. is an intriguing substance in the way that the moment you change the percentage of one of its components, the itself is different. (Education Dep. Properties: Chemical). Often, it can even be classified as a different type of . Commercial es are found in six basic categories, soda-lime , lead , borosilicate , aluminum silicate , ninety-six percent and fused silica . Soda-lime is the most common and least expensive . Approximately ninety percent of all is soda-lime . Soda-lime contains between sixty and seventy-five percent silica, twelve to eighteen percent soda and five to twelve percent lime. Its resistence to high temperature an ...

... lives beneath the Earth's icy polar tundra's in the arctic and Antarctic. George W. Wetherill even notes that “Even if a planet or moon could not support life globally, each could contain a tiny niche where life could thrive” (Science News, 328). What are the most favorable conditions for life to develop? It is now known that life simply cannot emerge anywhere that does not contain water. It is mostly preferred that this water exists in liquid form, but there are possibilities that life can form in freezing as well as boiling conditions. Water and energy, which both exist in many places in outer space, are prime biological prospecting sites. this ranges from deep sea thermal vents to the M ...

... the sides to protect its claws, which the animal uses to rip open ant nest before eating. Then it flits its long tongue and literally licks up the ants. The anteater precedes to rip oben a termite or ant hill with its clawed hand and work its tubular snout down into the heart of the colony, trapping the insects on its tongue's sticky coating (Encarta ‘98). The anteater also uses the claws as a defense mechinism. The natural predators of the giant anteater are the jaguar and the puma. Anteaters defend themselves against the large cats by using their front four-inch-long claws. The puma and jaguar are careful in their attacks because an embrace by the giant anteater's powerful forelimb ...

... yeast, and rabies:to name a few. Within a year of Pasteur's remedy for rabies, he treated and cured maore than 2,000 patients. A German pathologist named Robert Kock (1843-1910) studied a disease called diptheria. Koch learned htat diptheria bacteria or bacilli could only be found in samples from a patients throat. Although Koch could not understand how diptheria was somehow affecting the victim's heart. Finally, Koch concluded that the bacilli produced a toxin that circulated the bodyand damaged heart cells. Soon Koch developed an antitoxin that both cured and prevented the disease. Lastly, a scottish docter nmed Joseph Lister(1786-1869) was worried about surgical infection. Lis ...

... 70% of oncogenes are located in the weak points of the chromosomes-hereditary regions where the DNA molecule may break or its portions may be rearranged into new combinations. Actually most of the times, the nucleus and the DNA are constantly exposed to substances that may alter the genes. But these alterations are almost always prepared by intricate mechanism with the function of preventing havoc in the cell. But if these changes persist in a given cell, that altered gene will breed true. Such damage to the chromosome may remove the oncogene from the influence of the genetic control mechanisms that normally govern its actions or an inactive oncogene may remove next to another gene ...

... 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 specific gene has been deactivated in all its body cells. Certain genetic disorders of humans can be studied with this technique in laboratory animals if the disease-associated gene occurs naturally in both humans and an appropriate study species, such as a mouse. In such human disorders, symptoms are caused by natural dysfunction of the gene. In the study animal the same gene can be deactivated or made dysfuncti ...

... tested by the United States near Alamogordo, New Mexico. In the final stages of World War II, the U.S. dropped atomic bombs on Hiroshima and on Nagasaki three days later to force Japan to surrender. The explosion produces great amounts of heat, a shock wave, and intense neutron and gamma radiation. The region of the explosion becomes radioactively contaminated, and wind-borne radioactive products may be deposited elsewhere. The hydrogen bombs an explosive weapon of enormous destructive powercaused by the fusion of the nuclei of various hydrogen isotopes in the form of helium nuclei. A hydrogen bomb is also known as a thermonuclear bomb. The structure of the bomb is an atomic ...

... The muscle gain stays fairly constant while more nutrients taken in by the animal are used in fat production causing the animal to require more energy for the production of muscle. Manufactured PST will provide a boost in the natural levels of PST in a maturing pig. If there is more PST, there will be more efficient utilization of feed and fat production will be kept to a minimum. PST is effective if it is taken in the expected dose of 5mg/pig/day. If the pig is given a substantially larger amount, 15mg/pig/day, there will be side effects. Researchers have shown that a pig on a high amount of PST will have gastric ulcers. Porcine somatotropin must be injected or implanted into the a ...