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» Browse Science and Environment Term Papers
Endocrine Disruption
Number of Words: 2635 / Number of Pages: 10
... the study of the endocrine system is that of a message in a bottle. We can think of the body as a river, and a specific hormone may be a bottle containing a message. The organs or glands mentioned above would manufacture the “bottles” (hormones) that would be released into the river (blood stream). If there were no receptor sites for the hormones in the body, then they would continue to flow along the river and probably not make their destination. However, there are systems of receptor sites that enable specific hormones to bind in specific places. Structure also plays a major role in ...
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Newton's Laws Of Motion
Number of Words: 484 / Number of Pages: 2
... between any two surfaces that touch, slide, or roll on one another.
Any change in an object’s speed is called acceleration. An increase in speed is called positive acceleration, while a decrease in speed is called negative acceleration, or deceleration. Acceleration can also mean a change in direction as well as in speed. A force is needed to change the direction of an object, so a change in force can also mean a change in direction as well as a change in speed. According to Newton’s Second Law of Motion, the change in direction of a moving object depends on the applied force.
The amount of ...
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Effects Of Drugs On Pregnet Women
Number of Words: 998 / Number of Pages: 4
... of congenital malformations such as cleft palates, microcephalus, and clubfoot. Mothers who smoke one pack a day during pregnancy have an 85% increased risk of having a child with mental retardation. Mothers that smoke during their pregnancy have double the chance of having a child with behavural problems.
Another one of the biggest factors that disrupts fetal growth and development is alcohol. This is a very common substance abuse of pregnant women. Everytime the pregnant mother is drinking, her fetus is also drinking. The alcohol crosses the placental barrier, and goes directly into the fetus& ...
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Handling Stress
Number of Words: 2045 / Number of Pages: 8
... or can cause stress². CAUSES OF STRESS There are many different things that cause stress. One may be if you have a big term paper due and you want to do your best to impress your seminar leader. Another may be peer or family related. All in all it is things, events, situations, and people that cause stress. It is how we perceive them that will determine whether or not stress will be a result from the encounter. Not only negative situations are the cause of stress. Joy and happiness can also cause stress even though they are positive. In a sense, it is we then who choose our own stressors. Selye noted ...
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Evolution From A Molecular Perspective
Number of Words: 3032 / Number of Pages: 12
... to be dealt with in the near future, but for now we need
only concern ourselves with the objective observation of these proteins in our
attempt to explain our ever mysterious origin. As humans, we are the first
creatures to question exactly where we came from and how we got here. Some
cling to religious creationism as a means, while others embrace the evolutionary
theory. As of now, and possibly forever, neither can be proven to be absolute
truth with hard facts, and both have their opposing arguments. The point of
this paper being composed is not to attempt to abolish the creationist view, a
fea ...
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Dinosaurs
Number of Words: 714 / Number of Pages: 3
... 160,000 lb., in the case of the brachiosaurus. Most dinosaurs were large,
weighing more than 1,100 lb., and few weighed less than 100 lb. Most were
herbivores, but some saurischians were carnivorous. The majority were four-
footed but some ornithischians and all carnivores walked on their hind legs.
Always classified as reptiles, dinosaurs have traditionally been assumed
to have been reptilian in their physiology, cold-blooded, and ectothermic. In
recent years several different lines of evidence have been interpreted as
indicating that dinosaurs may have had warm blood and high rates of metabolis ...
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Genetic Engineering
Number of Words: 1733 / Number of Pages: 7
... working on it. Much of it had to do with genetic engineering. In one of the projects
they took smallpox, which has otherwise disappeared from the world, and found a way to genetically
introduce into it, without reducing its efficacy as smallpox, either Ebola virus or equine encephalitis
viruses. Nobody seems to know what happened to those experimental viruses.
A third example: we now have plants genetically engineered to produce plastic. The idea is that we
will no longer need to depend so much on petroleum, or on the Middle East for petroleum. The
problem here, of course, is that t ...
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Genetic Engineering: Correcting The Code
Number of Words: 1116 / Number of Pages: 5
... May of 1994, the Food and Drug Administration approved a
genetically engineered tomato called “Flavr Savr”. Many people cringe at
the thought of eating them. These tomatoes, though, are proven better and
healthier even though they are slow ripening. The idea of altering a
plant's traits seems radical and new, but scientists have been doing it for
years by breeding desired qualities into crops (Henkel 10). “Subsequently,
seven vegetables were brought to market under the Pre-Market Notification,
PostMarket Authority approach that will govern the introduction of the new
food type” (Henkel 9). ...
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Comets
Number of Words: 2266 / Number of Pages: 9
... weak spots of the crust break open from the pressure, and the gas shoots outward; this is referred to by astronomers as a jet. Dust that had been mixed in with the gas is also pushed out, and as more jets appear, a small gas and dust shell forms around the nucleus, and this is called the coma.
The coma, also called the head, is a dense cloud of water, carbon dioxide and other gases and comes off of the nucleus. They can be several thousand kilometers in diameter, depending on the comet’s distance from the sun and the size of the nucleus. The size of the nucleus is important because since large nuclei ...
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Chemistry Investigation
Number of Words: 2447 / Number of Pages: 9
... The variable that I have decided to change is the temperature. I have decided to alter the temperature of the yeast and time the amount of carbon dioxide that will be given off at different temperatures. I have decided to time how much carbon dioxide is given off in five minutes.
Throughout the investigation, I will keep the temperature the same as I have specified for each reading. For example, if I am taking a reading in which the temperature must be 5 degrees, I will make sure that the yeast is kept at this temperature. When I am altering the temperature of the yeast, I will place it i ...
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