... . Once the lifesaving drug was tested on rabbits and mice, humans were able to use it and live with the disease. The number of animals used in the US per year is outrageous (see table 3). Although the overall numbers have reduced in the in the past 22 years. This could be due to the new laws and regulations that are constantly being ... passed, or to the onset of alternatives. Source: Scientific American. The Numbers of Research Animals. http.//www.sciam.com/0297issue/0297trendsbox.html (16, Feb. 2000). As stated many times, animal experimentation has led to great advances in medicine, b...

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... estimated using the Maximum Composite Likelihood (MCL) approach, and then selecting the topology with superior log likelihood value. The tree is drawn to scale, with branch lengths measured in the number of substitutions per site. The analysis involved 19 nucleotide sequences. Codon positions included were 1st+2nd+3rd+Noncoding. All positions containing gaps and missing data were eliminated. There were a total ... the relatedness of the two species was really high. However as we moved down the phylogeny the numbers did not stay consistent. We had one number go as low as 33 and others th...

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• Grade Level: High School

... this difference will also be translated in an overall trend that males will have greater foot lengths and hand spans. In order to take into account of this variable, equal numbers of males and females were sampled. The results of this investigation have been analysed with males and females together and each gender independently so that any differences across the sexes ... a better representation of the population and reduce the extent of any anomalies when averages are taken. Each individual was selected by random sampling. This involved numbering people and using a random number genera...

• Word Count: 3540
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• Grade Level: High School

... and more famous. Darwin's and Wallace's concept was based on five premises: 1) there is stability in the process of reproduction 2) in most species, the number of organisms that grow, survive, and reproduce is small compared to the number initially produced 3) in any population, there are variations that are not produced by the environment and some are inheritable 4) which individual will grow and ... , having a better condition for survival. This hypothesis was not enough, and more experiments had to be made. A British ecologist, called Kettlewell, prepared another test for this hypothe...

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... residue is left behind on hands, clothes, and other surroundings. These residues can be compared to other residues. Many times when a firearm is used a criminal will destroy the firearm serial numbers. To restore serial numbers, scientists use acid to dissolve the distorted metal crystals. The distorted metal crystals liquefy at a quicker pace than non distorted metal crystals leaving the serial ... number visible. There are other tests that can be done. Dental impressions can be used to identify an unidentified victim. Bite marks on a victim can be DARDAR 3 compared to a suspect. DNA "...

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... ordinary cell division (mitosis), by which the body grows (Yang 182). In this method, one cell becomes two cells, which have the exact same number and type of chromosomes as the parent cell. The second method of cell division occurs in the ovaries and testicles (meiosis) and consists of one ... cell splitting into two, with the resulting cells having half the number of chromosomes of the parent cell (haploid). So, normal eggs and sperm cells only have 23 chromosomes instead of 46. During cell division, many ... the genetic material so that some of the 14th chromosome is replaced by ext...

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• Has Bibliography
• Grade Level: Undergraduate

... is working with CSIRO on a large research project to improve the understanding of possible impacts both beneficial and non-beneficial genetic engineered crops have on the environment. There are a number of environmental benefits that support the use of genetically engineered crops as part of future agricultural practices. For instance, by growing pest resistant crops a reduced use of insecticides may entail ... used in irrigation, reducing the chances of soil salinity problems, especially in countries like Australia. Genetically engineered crops could bring a whole host of environmental...

• Word Count: 1050
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• Grade Level: Graduate

... manner, then the death penalty would also serve as a deterrent. Thus, it would decrease the number of first-time capital offenders, decrease the number of repeat capital crime offenders, and increase the number of lives that are saved due to the major threats of our society being removed and used as ... illustrate no tolerance to murderers. In January of 1976 there were 55 murders committed in Utah. In the preceding year after a murderer had been executed that number dropped to 44 murders the following year, a 20 percent decrease. A decade later we see that the count from January through...

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... Mautner, a chemistry professor at the University of Canterbury. "In sexual reproduction, some of the genetic material from each parent undergoes mutations that can lead to entirely new biological properties. Vast numbers of individual combinations become possible, and the requirements of survival "and choices of partners by the opposite sex "then gradually select which features will be passed on to ... seeks to develop animals as bioreactors 8. "Now animals successfully created' with altered DNA will be copied many times, as if they were mere documents and not living beings."" (Breslin,...

• Word Count: 2464
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• Grade Level: Undergraduate

... . An eukaryotic cell nucleus contains a lot of DNA and protein that get together to form a chromosome. Therefore, the chromosome is the major carrier of genetic information. All species have different numbers of chromosomes and different types of genetic codes inside these chromosomes. Human beings usually have 46 different chromosomes; other species can have as little as 2 chromosomes or as many as ... amount of DNA needed by a cell. The cell does a second division soon after the first, which divides the number of chromosomes in the cell in half. When a cell has half the number of chrom...

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... are all monosaccharides termed "simple sugars". Each has the chemical formula C6H12O6, but the arrangement of atoms and chemical groups in them is different. Monosaccharides are classified according to the number of carbon atoms they possess. Monosaccharides that have 3 carbons are termed trioses. E.g. glyceraldehyde and dihydroxyacetone, (used in respiration). Monosaccharides with 5 carbon atoms are called pentoses. E.g. ribose ... called a pyranose ring. When 2 monosaccharides are joined by means of a condensation reaction they form a disaccharide. (See diagram below) Polysaccharides ...

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... correct conditions and proper care, these cuttings will grow roots and develop into a new plant that is identical to its parent. There are a number of techniques for moving genes artificially. The oldest of these techniques is called Recombinant DNA. There are other, more modern methods of moving genes ... identical to each other. The scientist who engineered the calves have developed a reliable way to introduce new characteristics into livestock cells and produce an unlimited number of clones. The calves have a "marker" gene to show that they are products of genetic engineering. It may...

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... In the initial stage of HIV infection, the virus colonizes helper T cells, specifically CD4+ cells, and macrophages, while replicating itself relatively unnoticed. As the amount of the virus soars, the number of helper cells falls; macrophages die as well. The infected T cells perish as thousands of new viral particles erupt from the cell membrane. Soon, though, cytotoxic T and B lymphocytes kill ... viruses known. HIV's high replication rate further increases the odds that a mutation useful to the virus will arise. To fully appreciate the extent of HIV multiplication, look at the numbe...

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• Grade Level: High School

... that they are able to repair or correct these flaws allowing them to clone at a mass rate. "These cells can be used to make unlimited number of exact duplicates of the animal that they are derived from." (Daniel Pendick, August 16, 1997) The ABS team also claims a high success ... that produce pharmaceuticals in their milk." (Daniel Pendick, August 16, 1997) While using cloning, scientists are able to genetically alter the animal's genes in large numbers so this will speed up the process. (Daniel Pendick, August 16, 1997) A study presented at a meeting of the International Embryo Transfe...

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... as different from each other as one might assume. There are about seven different types as shown below: But in every type of print there are lots of differences; the number of lines, their shape or their size makes every figure different. Any type of organism can be identified by examination of DNA sequences unique to that species. Identifying individuals within ... your suspect really is the right person. With DNA, the same kind of thinking is used; you can look for matches (based on sequence or on numbers of small repeating units of DNA sequence) at a number of different locations on ...

• Word Count: 1890
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• Grade Level: Undergraduate

... another nucleotide. The two-polynucleotide chains of each DNA molecule are joined by pairs of bases held together by hydrogen bonds. These bonds are individually quite weak but in large numbers very strong. This helps to make DNA a very stable molecule which is an essential feature for a molecule, which carries and transfers vital information. The fact that the polypeptides are joined ... time if it started at one end and proceeded nucleotide by nucleotide along the entire length of the molecule, so instead the double helix opens up and replicates simultaneously at a number of different...

• Word Count: 1977
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• Grade Level: Undergraduate

... of the chemicals in the body provides information about the mode of exposure(ingestion, injection, inhalation, and s on) and the time of exposure relative to death. The forensic toxicologist has a number of isolation techniques (steam distillation, selective solvent extraction, microdiffusion), depending on the tissue and the analyte, which allow for the recove ury of drugs and chemicals from biological samples. Once ... of forensic medicine at the University of Lyons, France, was the first to try to individualize bullets to a gun barrel. His comparisons at the time were based simply on...

• Word Count: 4661
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• Grade Level: Undergraduate

... of the variants that can only be separated by genotyping after the mutant genes had taken into affect. Some disorders display errors in DNA replication, where there is an increased number of trinucleotide repeats or by a cellular loss of function. The abnormalities are caused by malformation in transport, degradation and aggregation of proteins that lead to cell specific changes and neuron ... repeat of 40. The gene encodes the protein Huntingtin, which is found in many cells in neural and non neural tissues. The brains of humans with Huntington's disease with increased numbers of CAG r...

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... do this because it is convenient. Why spend hours walking around the supermarket putting items into a trolley when you can order it all from your phone, all while performing any number of other unrelated, mundane tasks. This idea of constant multitasking has become synonymous with being human. With advancements in technology making certain aspects of our lives much easier, Information technology ... I am unable to do without the use of technology, but also carries out functions that I am fully capable of doing myself, however now there is no need to. Storing phone numbers, among other m...

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... rotate slightly to pull the filaments across each other. "Muscle fibers, though, are just the building blocks for whole muscles- (6). "In chemical composition the fibers may be said, in round numbers, to consist of seventy five percent of water, about twenty percent of proteids, two percent of fat, one percent of nitrogenous extractives and carbohydrates, and two percent of salts, which ... nucleus and to power the DNA strands. Muscle and Aging Everyone knows that when we age, our muscles weaken and our movements become slower. This is because with aging comes a number of changes to the...

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... be many possible benefits if therapeutic cloning using human embryos is successful. Then perfectly matched replacement organs could become freely available to sick and dying people. That would save countless numbers of lives, and increase the quality of life of countless others. Three possible examples of therapeutic cloning might include the use of insulin-secreting cells for diabetes; nerve cells in ... stroke or Parkinson's disease; or liver cells to repair a damaged organ. This procedure would have a number of advantages, when compared to regular organ transplant donated by a second...

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... be developed. Computers have made the techniques used to match fingerprints very easy. Until recently, the old way was the Henry Classification System. This was a big sequence of letters and numbers broken down into several levels of classification. It could take weeks or months to compare a suspect fingerprint to a department's print files. Prints can be scanned directly into a computer, doing away ... the droplet. Cast off stains are a result of hitting. Pulling back from a blow produces a blood spatter that indicates direction, by creating an arc of blood droplets. You can determine ...

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... . Many are concerned that "once researchers develop the perfect carp' or perfect chicken' these will be the ones that are produced in mass numbers. All other less desirable' species would fall by the wayside and decrease in number. Some feel that the perfect animals may even be cloned--reproduced as exact copies "reducing even further the pool of available genes on ... ...

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... to me because it just doesn't make sense. I tried for hours to find the last knot, but I was unsuccessful. After getting use to doing the math work on paper, I made a "number" tree of a knot with seven crossings. Sure enough, I found 128 knots, which is 64 doubled. Again, I went back and tried to find the 64th knot, but still could not. I think ... last picks and I didn't know what "family tree of knots" really meant. Once I got into it though, I actually liked it because it was a challenge. I got to do actual math with numbers on paper, which is why I like math in the first place. I fe...

• Word Count: 864
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... more about the crime scene than other surrounding investigators. Upon arriving to the crime lab I submit a letter of transmittal which includes the following information: my agency, location and telephone number, case identification numbers and associated evidence submissions including all communications relating to them, a description of the nature of offense and basic facts relating to it, names and descriptive data about the individuals ... ...

• Word Count: 1650
• Approx Pages: 7
• Grade Level: Undergraduate