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» Browse Science and Environment Term Papers
Genetic Engineering Of Foods
Number of Words: 777 / Number of Pages: 3
... to frost. This shortens their growing season. Fish, on the other hand, survive in very cold water. Scientists identified a particular gene which enables a flounder to resist cold and used the technology of genetic engineering to insert this 'anti-freeze' gene into a tomato. This makes it possible to extend the growing season of the tomato.
The marketing of genetic engineering inspires visions of perfect health, long life, and miracle foods.
The reality is that these claims are often completely unsubstantiated and sometimes simply wrong.
Claim: Genetic engineering is necessary to feed the world.
Fact: ...
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Hurricane Floyd
Number of Words: 1228 / Number of Pages: 5
... Easterly waves, what hurricanes develop from, are long, narrow regions of low pressure which occur in ocean winds called trade winds. At first, these easterly waves can grow into something called, a tropical depression. A tropical depression occurs when winds are up to 31 mph. Then tropical depressions can be upgraded into a tropical storm if the winds reach speeds of 74 mph or less. Then finally a the storm can be bumped up into a hurricane if the winds reach 75 mph.
The National Weather Service is constantly trying to provide us with data and other information about when and where hurricanes are fo ...
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Nuclear Waste Management
Number of Words: 1179 / Number of Pages: 5
... storage,
and disposal of the depleted uranium. When nuclear fuel is first loaded into a
reactor, 238U and 235U are present. When in the reactor, the 235U is gradually
depleted and gives rise to fission products, generally, cesium (137Cs) and
strontium (90Sr). These waste materials are very unstable and have to undergo
radioactive disintegration before they can be transformed into stable isotopes.
Each radioactive isotope in this waste material decays at its characteristic
rate. A half-life can be less than a second or can be thousands of years long.
The isotopes also emit characteristic radi ...
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Holograms
Number of Words: 1072 / Number of Pages: 4
... can just move your head to one side. The apple seems to "move" out of
the way so you can see the orange or even the back of the apple. If that
seems a bit obvious, just try looking behind something in a regular
photograph! You can't, because the photograph can't reproduce the
infinitely complicated waves of light reflected by objects; the lens of a
camera can only focus those waves into a flat, 2-D image. But a hologram
can capture a 3-D image so lifelike that you can look around the image of
the apple to an orange in the background -and it's all thanks to the
special kind of light waves produce ...
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Current Status Of Malaria Vaccinology
Number of Words: 2080 / Number of Pages: 8
... along with saliva. The sporozoites head directly for the
hepatic cells of the liver where they multiply by asexual fission to
produce merozoites. These merozoites can now travel one of two paths. They
can go to infect more hepatic liver cells or they can attach to and
penetrate erytherocytes. When inside the erythrocytes the plasmodium
enlarges into uninucleated cells called trophozites The nucleus of this
newly formed cell then divides asexually to produce a schizont, which has
6-24 nuclei. Now the multinucleated schizont then divides to produce
mononucleated merozoites . Eventually t ...
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Global Warming A Serious Threat
Number of Words: 880 / Number of Pages: 4
... temperature, which could be the most direct effect of climate change, causes the heat problem. Because their cardiovascular system has to work harder to keep the body cool during hot weather. The temperature causes harmful effects to human health and another is cause of lung problem. "Higher air temperatures also increases the concentration of ozone at ground level". When this happens, the harmful ultraviolet radiation in the upper atmosphere reaches the earth's surface. The ESP states that "Ozone damages lung tissue, and causes particular problems for people with asthma and other lung diseases. ...
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The Effects Of Processing Vegetables
Number of Words: 1004 / Number of Pages: 4
... is derived from. Carrots were the vegetables chosen to be tested in this experiment. This experiment was designed to test if the processing of a carrot produces gas. In turn discovering the health related differences of canned, frozen and fresh carrots. Canning is a process of hermetically sealing cooked food for future use (Encyclopedia.com, 1999). This process is also called sterilization because it involves exposing the food to high temperatures for only minutes or seconds to protect against all the harmful microorganisms and other spoilage agents. Freezing is a process that prevents harmful microor ...
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The Polar Bear
Number of Words: 1548 / Number of Pages: 6
... have this feature. These pads help the bear retain heat and to grip the ice and provide better traction. Polar bears are fast movers. When on uneven ice the bear will “trot”, moving its legs on opposite sides in unison. It can trot at 12 to 18 miles per hour. When it is running, it can reach speeds of up to 35 miles per hour. The bear can travel around 50 miles on an average day.
The polar bear is also an expert swimmer. The bear has a long neck with a small head which help it to be more streamlined when it is in the water. It also has partially webbed feet which help it to paddle through ...
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Diverrsity Of Plants
Number of Words: 2857 / Number of Pages: 11
... derived from an aquatic ancestor, but the evolution of their
conducting tissues, cuticle, stomata, and seeds has made them progressively less
dependent on water. The oldest plant fossils date from the Silurian Period,
some 430 million years ago.
The common ancestor of plants was a green alga. The similarity of the
members of these two groups can be demonstrated by their photosynthetic pigments
(chlorophyll a and b,) carotenoids); chief storage product (starch); cellulose-
rich cell walls (in some green algae only); and cell division by means of a cell
plate (in certain green algae only). ...
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Chlorine
Number of Words: 496 / Number of Pages: 2
... chlorides. Chlorine also strongly reacts with nonmetals
such as sulfur, phosphorus, and other halogens. If you were to mix hydrogen and
chlorine gases and keep them in a cool dark place, the mixture would be stable,
but if it were exposed to sunlight, it would cause a strong explosion. If a
burning candle were placed in a sealed container of chlorine, it would keep
burning, and it would produce thick, black, smoke, leaving behind soot. There
are five oxides that chlorine can form: chlorine monoxide; dichloride monoxide;
chlorine dioxide; chlorine heptoxide; and chlorine hexoxide. Chlorine is used in
bl ...
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