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Alchemy

... is to say 'the preparation of the black ore', or `powder', which was regarded as the active principle in the transmutation of metals. To this name the Arabs affixed the article `al', thus giving al-khemeia, or alchemy. HISTORY OF ALCHEMY: From an early period the Egyptians possessed the reputation of being skillful workers in metals and, according to Greek writers, they were conversant with their transmutation, employing quicksilver in the process of separating gold and silver from the native matrix. The resulting oxide was supposed to ...

Number of words: 3747 | Number of pages: 14

Cfc

... and bigger until late in 1973. Sherwood Rowland and Mario Molina, two distinguished chemists, came up with a surprising result in his calculations concerning the s and ozone layer. s are basically inactive in the troposphere(around the altitude of 50,000 feet) so it would gradually drift upward until they reached the mid-stratosphere.(about 100,000 feet) At this point s would be broken down by short-wavelength ultraviolet radiation from the sun. This radiation is the one which would not reach the lower atmosphere in large amounts because of th ...

Number of words: 1018 | Number of pages: 4

Dyslexia

... phonological processing, in reading, writing, spelling, handwriting, and sometimes in arithmetic. is not a result of lack of motivation, sensory impairment, inadequate instructional or environmental opportunities, or other limiting conditions, but may occur together with these conditions. Although is life-long, individuals with frequently respond successfully to timely and appropriate intervention." Definition of " develops during the first six months of gestation . Neurons are churned out in the brain's ventricular zone. Attached t ...

Number of words: 1175 | Number of pages: 5

Dinosaur History

... weighed as much as fifty tons, which is seven African Bull Elephants. We first discovered the fossils and bones shortly under the surface of the Earth. After scientists got more into the study they started to dig deeper down. The fossils get so deep because of the years of rocks and dirt that were piled up on it. Some also get buried if a dinosaur were to die next to a river, and over the years the river probably changed courses a little, so therefore the bones would be covered up. They would actually be in the bank of the river. The Ev ...

Number of words: 995 | Number of pages: 4

Epilepsy Oral

... was early 400 B.C. when Hippocrates linked seizures to problems in the brain. This view was not accepted by his contemporaries and was pushed aside. It was not until the late 1800s that people again began to understand that epilepsy was caused by a brain malfunction. Two European physicians, John Hughlings Jackson and W.R. Gowers, studied people with epilepsy at the National Hospital for Paralyzed and Epileptics in London and proved Hippocrates' theory that epilepsy is a brain malfunction. Still, the 19th century health care system ...

Number of words: 1060 | Number of pages: 4

Advanced Green Builder Demonstration House

... using renewable resources with the environmental impact of their entire existence in mind. This meant consideration was given to such things as raw materials, manufacturing processes, the transportation of the products, and how they are recycled once their usefulness has ended. Also, due to the extreme urban sprawl, an individual waste water system is used as an alternative to laying new collection pipes. This waste water system is designed to be totally self sufficient in meeting the needs of the occupants of the house. Large metallic ...

Number of words: 1518 | Number of pages: 6

Computer Virus

... in the first place, it was going to be very difficult to determine how many floppy disks and hard drives had been infected. I wished I had learned about es a long time ago. What is a , anyway? Is it a computer with a cold? A computer "virus" is called a virus because of three distinct similarities to a biological virus. They are: ? They must have the ability to make copies of, or replicate, itself. ? They must have a need for a "host," or functional program to which it can attach. ? The virus must do some kind of harm to the computer sys ...

Number of words: 701 | Number of pages: 3

Cardiovascular Disease

... women and men, the chance of dying from cancer and several other diseases is greater for individuals with sedentary life-styles than those who engage in a daily brisk walk of 30 to 60 minutes (Cufman, 1993). Moderate regular exercise, lasting say 15 to 30 minutes, five times a week also has been found to improve health. In fact, high levels of exercise increase the risk of injuries (Edlin p.130 ). If you exercise regularly, your overall risk of a heart attack is about 50 percent less than if you are inactive and out of shape. With routine exe ...

Number of words: 2198 | Number of pages: 8

Muscular Dystrophy

... study the disease. When functioning properly, the Duchenne gene carries instructions for assembling a muscle protein known as dystrophin. At about 2,500,000 nucleotides, dystrophin is one of the largest genes known. Dystrophin is largely responsible for reinforcing and stabilizing the sarcolemma. Dystrophin associates with the muscle fiber sarcolemma by interacting with the actin microfilaments and with a transmembrane protein complex linked to the extracellular matrix. This latter dystrophin-associated glycoprotein complex (DAGC) inclu ...

Number of words: 1991 | Number of pages: 8

Little Green Men Or Just Little Microscopic Organisms?

... fossils of the microscopic organisms intact. Two highly regarded chemistry professors from Stanford, Claude Maechling and Richard Zare, dissected three meteorites that were about 2 to 8 millimeters long and found trace elements of a big mumbo jumbo word— polycyclic aromatic hydrocarbons. That pretty much means that there once was a warmer climate and maybe even lakes or oceans. Life on Mars is now a real idea. The climate of Mars about 3.8 billion years ago was much similar to the young Earth. Microbes and bacteria probably sprouted ev ...

Number of words: 603 | Number of pages: 3

Wavelength Of 10 Or Higher And 11 Down. Gamma Rays Are Produced In Labs

... brain and Cardiovascular Abnormalities. These are some of the many uses of Gamma Rays in Medicine. Gamma Rays are also Used a great deal in modern day industries. Gamma Rays can be used to examine metallic castings or welds in oil pipelines for weak points. The rays pass through the metal and darken a photographic film at places opposite weak points. In industry, Gamma rays are also used for detecting internal defects in metal castings and in welded structures. Gamma rays are used to kill pesticides and bugs in food. Gamma rays are also ...

Number of words: 646 | Number of pages: 3

The Positive Effects Of DDT

... Some of them are outrageous exaggerations, while others hold no truth at all. The most redeeming feature of DDT is its ability to protect crops from a variety of different pests. This is why DDT is known as the most effective pesticide ever produced (Ray 71). It is proven to have been the most effective chemical ever to prevent the spread of malaria all over the world. It nearly wiped out the disease in some countries altogether. It has been repeatedly proven that DDT does not cause any form of cancer in humans. Contrary to wh ...

Number of words: 1873 | Number of pages: 7

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