More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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The average adult has about 21 square feet of skin.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
Find the derivative by using the chain rule, question 2
(left) Urine sample from an unaffected person does not change color upon exposure to air. (right) Ur