Science Essays
Breast cancer 2
Breast cancer 2 Scientists have finally found out why MPA medroxyprogesterone, otherwise known as Provera performs just as well in low doses in small children who are dealing with early sex traits, as it does for women in high doses with breast cancer. You may have heard of Provera before as the drug that delivers hormone replacement therapy for women who are going through menopause. Two scientists, named Lee and Auchus were trying to figure out why Provera is able to treat both early pu...
Black powder
Black powder Black powder by far has been one of the most remarkable discoveries of this time. It has helped light up our fireworks on the Fourth of July, allowed us to use guns, and to make smoke. The history of black powder is considered to be founded in Italy around the time of the thirteen hundreds. It was supposedly found by the Chinese during this time.Shortly after with the founding of guns, did black powder find fame. This black powder was used to make an explosion causing the bu...
Blood doping
Blood doping Running the Race to Obtain the Prize? Each year athlete�s ability to perform seems to increase by leaps and bounds. Some reasons for this can be attributed to better training methods, better conditioning techniques, and better over all health of the athlete. While most situations involve one or more of the previously scenarios, some athletes always seem to take it to a step further. They engage in a process called blood doping. This procedure does increase physical p...
Blood pressure
Blood pressure Blood pressure "Blood pressure" is the force with which your heart pumps blood through the body. Occasional increases in blood pressure levels are not unusual. Hypertension Hypertension is high blood pressure. When heart beats (contracts and relaxes) it pumps out a certain volume of blood. The maximum arterial pressure, measured in mm Hg, determines the systolic reading and the lowest reading of this pressure is called the diastolic pressure. It is widely accep...
Boiling water
Boiling water I went online and found out a lot of information about boiling water. If you cover the tin and allow the water and air to cool down, the air will cool and contract, lowering the pressure in the tin. If it lowers enough, the partial vacuum will collapse the walls of the can! The boiling point definitely reduces with air pressure. There is a famous demonstration where boiling water or coffee is drunk, the trick is it was in a vacuum chamber where it boiled at room temperature....
Born too early
Born too early According to the American Association of Premature Infants (AAPI), over 400,000 babies are born prematurely or at a low birth weight. As a result of being born early they are more likely to require high-technology intensive and specialized care in the hospital and follow-up care as infants and children. As a result, many have chronic medical problems and developmental problems. Some of the problems consist of respiratory distress, feeding issues, language delays and several ot...
Bipolar disorders
Bipolar disorders The phenomenon of bipolar affective disorder has been a mystery since the 16th century.History has shown that this affliction can appear in almost anyone. Even the great painterVincent Van Gogh is believed to have had bipolar disorder. It is clear that in our society many people live with bipolar disorder; however, despite the abundance of people suffering from the it, we are still waiting for definite explanations for the causes and cure.The one fact of which we are pa...
Birth Control
Birth Control Methods of Birth Control Birth control pills are an oral contraceptive for women. They are monophasic, biphasic, or triphasic. Each type contains estrogen and progestin in differing amounts. Monophasic birth control pills maintain the same levels of estrogen and progestin throughout the course, while biphasic pills keep the estrogen level the same while increasing the progestin levels for the last 11 days of the pack, and triphasic pills are designed to mimic the natu...
Black holes 2
Black holes 2 Black Holes What are black holes? Black holes are the remains of a massive star that has collapsed and shrunk to a tiny point in space. They have all of the gravity of the star concentrated into a miniscule point many times smaller than the original. Black holes are difficult to see because they are spinning faster than the speed of light. This causes all light to be pulled to them leaving no refractions to be seen by the naked eye. The only way to actually �see� a bla...
Black holes 3
Black holes 3 The theory that black holes have existed is not new at all. The thought of them first started in 1783 when Rev. John Michell applied Newton�s theory of gravity to predict the possibility of so-called �dark stars.� Albert Einstein�s theory of relativity predicted in 1915 �Schwartzschild singularities.� In 1967, these were renamed �black holes.� A black hole is collapsed object (usually a star) that has become invisible and has such a powerful gravitationa...
Biotechnology in food
Biotechnology in food REG MITCHELL's defence of ``Frankenfoods'' -- genetically engineered (GE)farm products -- in his Oct. 9 article ``So-called Frankenfoods have no more pathogens than are found in nature'' is a repetition of the mantra we hear daily from the global corporations that dominate agricultural biotechnology. His principal point seems to be that since life abounds with risks of various kinds (cancer-inducing elements in the environment, the risk of being hit by a truck) we ...
Bipolar disorder 2
Bipolar disorder 2 The problem of bipolar affective disorder has been a mystery since the 16th century. It has shown that this affliction can appear in almost anyone. Even the great painter Vincent Van Gogh is believed to have had bipolar disorder. It is clear that in our society many people live with bipolar disorder; despite the number of people suffering from it, we are still waiting for definite explanations for the causes and cure. The one fact of which we know is that bipolar disord...
Bipolar disorder 3
Bipolar disorder 3 Manic-depressive illness, or bipolar disorder, is a psychiatric disorder and brain disease is characterized by severe mood swings, from mania to depression. Bipolar Disorder is a biological disease of the brain. It is caused by a chemical imbalance. It affects more than 2 million Americans and may have a strong genetic link Men and women are equally likely to develop this disabling illness. Bipolar disorder changes lives, affects relationships, and can be deadly. There ...
Bipolar disorder 4
Bipolar disorder 4 Bipolar Disorder: Its Causes and Effects At least 2 million Americans suffer from bipolar disorder, more commonly known as manic-depression. This illness usually begins in adolescence or early adulthood and continues throughout life. Although it may come into affect at any time, most individuals with the disorder experience their first mood episode in their 20�s. However, manic-depression quite often strike teenagers and has been diagnosed in children under 12. ...
Bipolar disorder
Bipolar disorder The phenomenon of bipolar affective disorder has been a mystery since the 16th century. History has shown that this affliction can appear in almost anyone. Even the great painter Vincent Van Gogh is believed to have had bipolar disorder. It is clear that in our society many people live with bipolar disorder; however, despite the abundance of people suffering from the it, we are still waiting for definite explanations for the causes and cure. The one fact of which w...
Biology work requirement 3 biology work requirement 3
Biology work requirement 3 biology work requirement 3 A Ecological issue: Deforestation, logging Issues: � Effects wildlife habitats \ biodiversity � Increases soil degradation erosion. � Carbon storage - leads to more Carbon dioxide in atmosphere - leads to global warming Social- technological: � Can lead to global warming � Less use of timber to stop Essay. The ecological issue that I have been researching is the Deforestation. This is a major issue...
Biology, the five major compounds
Biology, the five major compounds Compounds That Compose the Human Body There are five major groups of compounds that compose the human body. They are carbohydrates, lipids, proteins, nucleotides, and water. These are all very important to humans and without them we would not be able to survive. They have many functions that encourage a human cell and a human body to function. Carbohydrates include sugars and starches, contain carbon, hydrogen, and oxygen which appears in a ratio...
Biomechanics
Biomechanics The term biomechanics means the study of the structure and function of biological systems using the methods of mechanics. Biomechanics studies the process of kinematics and develops artificial limbs and footwear specifically to aid the body in performance. The study of biomechanics also includes the stress testing on crash dummies in car accidents and any sport where stress is placed on the body in order to produce performance. The type of stress specifically is the joint stimul...
Bioremediation of explosives in contaminated soil
Bioremediation of explosives in contaminated soil Bioremediation of Explosives in Contaminated Soil Abstract TNT is not the kind of substance that most people think of composting, but it can be done! At several U.S. Army depots, the water used in processing explosives was disposed of through evaporation from unlined lagoons. This has resulted in sediments and soils that are contaminated with TNT (2,4,6- trinitrotoluene) and its derivatives RDX (hexahydro-1,3,5-trinitro-1,3,5-triazi...
Biological effects of radiation
Biological effects of radiation The Biological Effects of Radiation Whether the source of radiation is natural or man made, whether it is a small dose of radiation or a large dose, there will be some biological effects. Radiation causes ionizations of atoms, which will affect molecules, which may affect cells, which may affect tissues, and so on. Although most people tend to think of biological effects in terms of the effect of radiation on living cells, in actuality, ionizing radia...
Biological warfare
Biological warfare There is no longer a question of whether or not a bioterrorist will attack, but rather the question remains, when will they attack? �It is highly likely that a terrorist group could threaten or attack Americans with germs within the next few years,� according to President Clinton. (Solomon) Biological warfare intentionally uses viruses, bacteria, fungi, or toxins from living organisms and death or disease in humans, animals, or plants. Fermentation can be used to...
Biology 2
Biology 2 The title of the Journal that I used is The Dynamics of Flight-Initiating Jumps in the Common Vampire Bat Desmodus rotundus and was written by William A. Schutt, Jr, J. Scott Altenbach, Young Hui Chang, Dennis M. Cullinane, Juhn W. Hermanson, Farouk Muradali, and John E. A. Bertram. The journal was accepted on September 15, 1997, and the article that I used was on page 3003 through 3012. The most prominent question or concern that was probed in the article dealt with the "dynam...
Biology heat loss practical write up
Biology heat loss practical write up Biology Coursework Practical � Heat Loss The aim of this practical is to find to what extent does the surface area to volume ratio of an object affect the rate of heat loss from the object Hypothesis: As the ratio of surface area to volume of an object decreases the rate of heat loss from the object will also decrease. Objects with the same surface area to volume ratios loose heat at the same rate so long as there are not other variables invol...
Biology term paper tigers
Biology term paper - tigers The tiger is part of the kingdom Animalia, phylum Chordata, class Carnivora, family Felidae, subfamily Panthernae, genus/species Panthera tigris. Tigers have round pupils and yellow irises (except for the blue eyes of white tigers). Due to a retinal adaptation that reflects light back to the retina, the night vision of tigers is six times better than that of humans. Like domestic cats, tiger claws are retractable. Tiger scratches on ...
Bioethics
Bioethics BIOETHICS Progress in the pharmacological, medical and biological sciences involves experimentation on all living species, including animals and humans. The effectiveness of medications investigative procedures and treatments must at some point be tested on animals and human beings. Although tests are conducted much more frequently on lab animals, especially those most related to humans, they do not provide sufficient information. The history of medicine shows that ...