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Search results 6491 - 6500 of 14167 matching essays
- 6491: Cryogenics: Is It Worth Waiting For
- ... chief concern in cryobiology is to preserve living matter for future use. This method can also be called cryopreservation. Cryotherapy is the use of extreme cold in treatment. The first trials of cryotherapy proved with great results (“Cryobiology” Comptons 1, McGrady 97). Frozen cells can be kept alive for very long periods of time in a state of “suspended animation.” Almost immediately after rapid thawing, the frozen cells regain normal activity ... frozen and stored for indefinitely for many years as opposed to only three weeks as it was before cryogenic technology was used. Surgeons can use a cryoscapel, freezing tips, to deaden or destroy tissue with great accuracy and little bloodshed (“Cryogenics” Academic 350, “Cryobiology” World Book 929). Scientists use a liquid gas called liquid nitrogen to freeze and store cells. Some could problems also occur in cryogenics. If cells are not ...
- 6492: Hammerhead Sharks
- ... like a shovel the bonnethead rarely grows more than four feet long. This shark is commonly seen inshore. 3. Smooth hammerhead (Sphyrna zygaena)-Bronze with dusky fin tips, it can grow to thirteen feet. 4. Great hammerhead (Sphyrna mokarran)-Attaining a length of a possible 18 feet, this is the largest and most dangerous of all the hammerheads. One of the most interesting things about the hammerheads is the unique shape ... their prey whole, or tear off large chunks of flesh at a time. They also eat dying animals. Hammerheads have definite food preferences. Their elongated head may help them locate the prey they prefer. The Great Hammerhead likes to eat stingrays. This was observed when the stomach contents of a hammerhead were examined and stingray spines were found. Stingrays are usually difficult to detect because they are partially buried in the ...
- 6493: Genetic Engineering
- ... have to be harvested early. Thus, it is unnecessary to spray chemicals on them to prematurely change their color. While the US has not yet approved the new crops, several countries have and are making great profits off them. Finally, through a proccess known as gene splicing, geneticists are able to cross different organisms and therefore breed beneficial life forms. The Supreme Court ruled that scientists can patent newly created life ... for those who have chemical deficiencies. The most well-known example of such a supplement is insulin. In the 1800's, diabetics received insulin from sheep, yet as it can be imagined, it took a great deal of sheep to sustain one person. After the discovery of DNA, geneticists used gene splicing to develop a bacterium to produce insulin. By cloning the human gene for insulin and inserting it into bacteria ...
- 6494: Frogs
- ... days. When the legs are about as long as the body, the third stage, which is called “ metamorphic climax,” and takes place very rapidly, begins. During this last stage, which lasts about a week, many great changes occur. They lungs complete their development, and the gills disappear. The skin gets thicker, nostrils form, and the tail is completely resorbed. Most frogs prefer moist regions, and many kinds live in the water ... South Pacific, Philippine Islands, and parts of Africa savor frogs, and consider them a delicacy. The Chinese and French are lovers of frogs legs. One of the reasons frogs legs are so expensive is the great demand for frogs in scientific and medical laboratories. Because their skeletal, muscular, digestive, nervous, and other systems are similar to those of higher animals, frogs are very important in these in these fields of research ...
- 6495: Evolution of Immunity and the Invertebrates
- ... antibodies while T help produce antibodies and serve to recognize antigens. Acquired Immunity is highly effective but takes days to activate and succeed because of it's complex nature. Despite this, acquired immunity offers one great feature: immunological memory. Immunological Memory allows the lymphocytes to recognize previously encountered antigens making reaction time faster. For this reason, we give immunizations or booster shots to children. So it has been established that current ... mechanisms first in invertebrates only later to be discovered in vertebrates. Invertebrates use key defensive molecules such as antibacterial peptides and proteins, namely lysozyme, to expose bacterial cell walls. Thus targeting the invader. This offers great potential for medicinal purposes, because lysozyme is also found in the innate immunity of humans in it's defense of the oral cavity against bacteria. Peptides of the silk moth are currently being developed as ...
- 6496: Evolution From A Molecular Perspective
- ... allow the immense ly dense atmosphere to condense, thus causing many years of rain. Would not this rain cause almost any climax group's entire population to become extinct? Also, before the rains came, the great majority of the organisms inhabiting the Earth were land creatures. Once the rains came, the Earth was covered in water, killing thousands of populations, and effectively burying them in the water. The water preserved their ... evolution. Speaking solely of hemoglobin, the variances between species can be shown through greater or less affinity for oxygen. "H. F. Bunn has shown that mammalian hemoglobin can be divided broadly into two groups: the great majority have intrinsically high oxygen affinity, which is lowered in the red cell by DPG," (D-2,3-biphosphoglycerate) "while those of ruminants and cats (Cervidae, Bovidae, Felidae) and of one primate, the lemur, have ...
- 6497: Differences and Effects of Natural and Synthetic Fertilizers
- ... nutrients they receive from the soil. The nutrients required for growth are classified into two groupings, macronutirents and micronutrients. Macronutrients are those that are needed in very large amounts, and whose absence can do a great harm to the development of the plant life. These nutrients include calcium, nitrogen, phosphorus, and potassium, and are very sparse in most soils, making them the primary ingredients in most fertilizers. The other, more common ... or applied to soil, thus greatly increasing its potency and maximizing plant growth. As mentioned before, however, there are both natural and inorganic fertilizers, all with varying effects. The compositional differences of these types are great, indeed. Natural fertilizers, as one would expect, are totally organic, and usually come from the manure of animals. These are the fertilizers that produced the forests of the world, among much other plant life in ...
- 6498: Cloning
- ... after scientists in Oregon cloned a monkey (Fackelmann 276). The most major breakthroughs of the century in science has occurred and we are not ready for it. The scientific breakthrough of cloning has caused a great deal of controversy in the media and also in the government. The advantages of cloning are tremendous to the human race and cannot be ignored. I believe that cloning humans is what the human race ... is possibly the most important reason for embryo cloning. Oncologists (People who study Cancer) believe that embryonic study will advance understanding of the rapid cell growth of cancer. Cancer cells develop at approximately the same great speed as embryonic cells do. By studying the embryonic cell growth, scientists may be able to determine how to stop it, and also stop cancer growth in turn (Watson 66). Whenever there is a draft ...
- 6499: History of the Cell Theory
- ... has three parts: 1. All organisms are composed of cells. 2. Cells are the basic units of structure and function in organisms 3. All cells come from preexisting cells. The impact on science was very great due to the discovery of cells and the cell theory. Many or all things were effected by the discovery of cells, everything was looked upon in a different way. Some people still did not believe ... people that believed in cells were insane, some people even wanted to put Antoni van Leeuwenhoek in an insane asylum because he believed in cells. As you can see the impact of cells was very great on people. Other things were discovered due to the discovery of cells, such as the dicovery of atoms, the make-up of all things on the Earth.
- 6500: Biome Broadcast
- ... watched the robin for a while we continued hiking until 12:30 PM. Everyone was hungry so we decided to find a spot to eat our lunches. We found a perfect spot, it had a great view, a patch of beautiful dandelions, and a big beautiful maple tree to sit under. A picture of the great view we had during lunch. A picture of one of the many dandelions that were in the patch that we were sitting next to during lunch. A picture of the maple tree we sat under ...
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