• American History • Arts & Movies • Biographies • Book Reports • Creative Writing • English • Geography • Health & Medicine • Legal • Miscellaneous • Money & Finance • Music • Poetry • Political • Religion • Sciences • Society • Technology • World History
Cancel Subscription
... the invention of the maser many scientists became interested in the idea of building an optical maser, which soon received the name laser (light amplification by stimulated emission of radiation). Townes paired with Arthur Schawlow, two Soviets, Nikolai Basov and Aleksander Prokhorov, as well as Gordon Gould were all interested in developing a light-amplifying device. All of them knew that there were three essential ingredients in making a laser; a florescent material that would emit light when stimulated by radiation from an external energy source, two facing mirrors on the sides of the florescent material, and external energy source. Theodore Maiman was the first to successfully asse ...
... water loss by reducing the amount of light absorbed by the leaves; the leaves orient themselves parallel to the sun’s rays. Plants that exhibit paraheliotropic behavior usually do so at midday, when the sun’s rays are perpendicular to the ground. This reorientation takes place only in leaves of plants that are capable of nastic light-driven movements, such as the trifoliate leaf of Erythrina spp. (Herbert 1984). However, this phenomenon has been observed in other legume species that exhibit diaheliotropic leaf movement as well. Their movement is temporarily transformed from diaheliotropic to paraheliotropic. In doing so, the interception of solar radiation is maximized during the mo ...
... to decrease the chances of a miscarriage by using samples of maternal blood instead of amniotic fluid. The problem with amniocentesis is it uses a hollow needle to take fluid from the mother's uterus. The needle could damage the developing fetus if not inserted properly. Another advantage of FISH is that the parents get a much quicker test result than amniocentesis. After the sample is taken, amniocentesis can take up to three weeks before a test can be administered. With FISH, a same day result is given, which is much more convenient to the parents. Additionally, FISH is a simpler process. It uses specially prepared molecules which bind to specific regions of DNA. To find a particular ...
... codon consists of a sequence of three bases--for example, GAG or TCA. The four bases can be assembled into 64 possible codons. Because proteins are built from only 20 amino acids, most amino acids are specified by more than one codon. occur when one base is substituted for another or when one or more bases are inserted or deleted from a gene. Substitution affect only one codon, and in most cases the effect is minimal. One reason is the redundancy of the genetic code mentioned above. Because many codons mean the same thing, the altered codon might still specify the same amino acid. Furthermore, even if a mutation causes a wrong amino acid to be inserted into a protein, the change might b ...
... can get a job, but I myself would advise getting the highest amount of bioscience education possible. Jobs can be acquired by asking your professors, but, they may not be aware of any need for geneticists. Many times, reading advertisements may of some good. You may even make an appointment with biology and genetic firms yourself. Sometimes clinics or hospitals may even need a genetic specialist. I, myself, could also see a geneticist opening up his own clinic, such as radiologists do. In this way they could be able to make more money considering the amount of highly specialized geneticists with a Doctor of Medicine. The current payment outlook is not good for geneticists. A starting ...
... into acid rain can take from several hours to several days. Sunlight increases the rate of these reactions. Rainwater, snow, fog, and other forms of precipitation containing these mild solutions of sulfuric and nitric acids fall to the ground as acid rain. Years ago, when smokestacks were only a few stories tall, pollution from the smokestacks usually stayed near the ground and settled on the land nearby. This only caused unhealthy conditions for plants and animals near the smokestacks. To reduce this pollution, the government passed laws permitting the construction of very tall smokestacks. At the time, people thought that if the pollution was sent high into the air it would no lo ...
... speed of light. The distance from the black hole at which the escape velocity is just equal to the speed of light is called the event horizon. Anything, including light, that passes across the event horizon toward the black hole is forever trapped. Using a small black marble as an example to represent the size that the Earth would become if it collapsed and became a black hole, Todd R. Lauer, of the National Optical Astronomy Observatories said, " Black holes are very messy eaters. If you took that marble to an 'all-you-can-eat buffet' allowing it to consume all the matter around it, the feeding frenzy would produce as much radiation as the Sun." Research indicates that black holes may ...
... ounce of gold can be hammered into a 100 square foot sheet. Gold is the most reflective and least absorptive material of infrared (or heat) energy. High purity gold reflects up to 99% of infrared rays. Gold is also an excellent conductor of thermal energy or heat. Since many electronic processes create heat, gold is necessary to transfer heat away from delicate instruments. Gold alloy is the most tenacious and long-performing material available for protection of these temperatures. Geologists use the latest technology such as satellite surveys and geochemistry to locate an ore deposit. Computers are used to design the mine, which requires precise and accurate measurement of the ore dep ...
... of hummocky terrain in southern Alberta, and other areas, by various workers. Shaw suggested as many as 10 meltwater discharges, similar to those which caused the Livingstone Lake drumlins, would be needed to account for drumlin fields in other areas [Shoemaker, 1995, p. 3]. The subglacial meltwater hypothesis of Shaw et al has several parallels to an interpretation of drumlins as streamlined landforms caused by the currents of flood waters generated by uplift, presented in the 1979 article Drumlins and Diluvial Currents by Cox. Although developed independently, Shaw's approach resembles that outlined by Cox in several ways. Cox published a photo with the above mentioned article showin ...
... usually not needed to make a diagnosis but after the symptoms appear it is still best to make sure it is the chicken pox and not something much worse. The physician can easily make a diagnosis by checking the basic symptoms. Chicken pox is controlled by keeping the infected person and anything the infected person has come in contact with away from any people who have never become infected. There is not really a treatment, just medicine so that the rash does not itch. The disease blows over by itself.The disease cannot really be prevented because almost everybody gets it. The only precautions a person can take is to stay out of contact with people that are currently infected a ...
Browse: 1 2 3 4 5 6 7 8 9 10 11 next »