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Essays on Science

Genetic Engineering
Download This PaperWords: 390 - Pages: 2

... time a large amount of DNA of interest is produced. This can be purified from contaminating bacterial DNA easily and the resulting product is said to have been "cloned". So far, scientists have used genetic engineering to produce, for example: - improve vaccines against animal diseases such as footrot and pig scours; - pure human products such as insulin, and human growth hormone in commercial quantities; - existing antibiotics by more economical methods; - new kinds of antibiotics not otherwise available; - plants with resistance to some pesticides, insects and diseases; - plants with improved nutritional qualities to enhance livestock productivity. Methods: - ...



Tin
Download This PaperWords: 528 - Pages: 2

... ore cassiterite or tin stone, a dioxide of tin. The ore cassiterite before smelting and roasting must be crushed into a powder to remove the arsenic and sulfur from the ore cassiterite. When you smelter the tin you must heat it with carbon to remove the zinc, copper, bismuth, and iron from the tin. Tin had been used for many things but tins use is dropping rapidly although tin is still used a lot for plating. Plating such things as electical contacts. Tin is also used as a protective coating. This protective coating can be as small as 15/1,000,000 of an inch. This protective coating protects against rust on steel and other metals. A coating of tin also gi ...



Genetics Engineering
Download This PaperWords: 655 - Pages: 3

... computers to crack the code. This 15 year project is predicted to end by the year 2005(Dewitt, 1994). That is only 10 years from now. What does that mean to the average Joe? Well, today we already live with genetically engineered items. The FDA has approved bioengineered tomatoes that ripen without rotting(Dewitt, 1994). Entire herds of cattle are now being injected with a growth hormone(BST) so that they will produce more milk than ordinary cattle(Dewitt, 1994). Also drought resistance grass that needs no moving. Scientists will soon be able to collect DNA from endangered species. This DNA could be used to clone more condors, bald eagle, mountain gorillas, ...



Soil Salinity
Download This PaperWords: 286 - Pages: 2

... topsoil to the groundwater, due to rainfall or irrigation, can result in a dramatic rise in groundwater pressure and watertable levels. The trees of the open forests are now replaced by shallow-rooted crops and pastures which absorb far less water than the native trees. Those trees had been massive water pumps, sucking up moisture from deep underground and putting it back into the atmosphere through the evaporation from their leaves. With those pumps gone, excess rainfall accumulates underground and watertables rise to the surface, bringing ancient sediments of salt with them, often in heavy concentrations. Once exposed to the air and sun, the salts become even mo ...



Lasers And Their Applications
Download This PaperWords: 1998 - Pages: 8

... of light which is equal to 3.00 x 108 m/s and is the wave length of light. Also waves have crests, the high points of waves, and troughs, the low points. Constructive interference occurs when two waves of the same frequency meet at a crest or trough therefore combining to form a wave that has an amplitude equal to the sum of the individual amplitudes of the original waves. Stimulated emission is the process that the laser works on, which was first proposed by Albert Einstein in 1917. When a sufficient number of atoms, either gas solid or liquid, absorb energy so that they are in an excited state of higher energy stimulated emission can occur. Light of a spec ...



Ebola Virus 4
Download This PaperWords: 2184 - Pages: 8

... However, the average length of an infectious virion appears to be 920 nm. The virions are 80 nm in diameter with a helical nucleocapsid, a membrane made of 10 nm projections, and host cell membrane. They contain a unique single-stranded molecule of noninfectious (negative sense ) RNA. The virus is composed of 7 polypeptides, a nucleoprotein, a glycoprotein, a polymerase and 4 other undesignated proteins. Proteins are produced from polyadenylated monocistronic mRNA species transcribed from virus RNA. The replication in and destruction of the host cell is rapid and produces a large number of viruses budding from the cell membrane. Epidemics have resu ...



Creation VS. Evolution
Download This PaperWords: 1409 - Pages: 6

... of the fossil record. But their interpretations are exaggerated and foolish. Creationists will pick one scientific theory and do everything they can to point out it's flaws, disregarding what they can't prove wrong. They will often use emotions to control the public to their side. They spend their time trying to discover false evolution rather than teaching their beliefs to the general public. The theory of evolution removes humans from the center of the universe, and religious followers can't believe that their God, who created us in his image (Bible, 2), would allow that. The creationist arguments can be summed up in one example from the Morris -Parker book. T ...



Nuclear Power
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... health. In this critique I plan on reviewing some of the major issues brought up by each side and try to show how each author has distorted or skewed data. Then I plan on giving my interpretation and opinion on the future of nuclear power. Dr. Gofman seems to have many confusing ideas about the concept of nuclear power. First of all he shoots down the government for giving money to nuclear industries and claims that doing this is "totally inappropriate for government." I don't know if Dr. Gofman understands that we are kind of running out of energy sources, and until we better develop things like solar power to make them more useful and economical, we may need ...



Preservation Of The Environment
Download This PaperWords: 849 - Pages: 4

... pollution are in violation of the law. Or consider water. In early September over 1,000 people drank contaminated water at a county fair in upstate New York. Two died and 65 others were hospitalized. If you think this couldn't happen to you, think again. A recent federal audit found that nearly 90 percent of all violations of the Safe Drinking Water Act go unreported. Some of those violations are harmless data-entry errors, but they also include potentially lethal problems such as contamination with pesticides and fecal coliform bacteria. Things must be done in order to preserve NJ environment. The enforcement of laws against pollution is one of the th ...



Pollution From Livestock And Manure
Download This PaperWords: 514 - Pages: 2

... then plow it under or in the spring after the snow has melted. You also should watch the weather. You should not spreed when it is going to rain so the manure won't runoff the field. There are two ways of handling manure. The first is to spread it every or every other day. That is the worst because when you put it on snow and the snow melts it runs into a river or goes down to the ground water and pollutes it. The best way of handling of manure is to build a six month pit or harvester. That means that you can hold your livestock manure and all the runoff that is run into it for six months or more. To build a pit you must have a overview map that shows; ...




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