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 Wysłany: Czw 18:40, 31 Mar 2011 Temat postu: cheap kids jordans silent+springnio |
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substances are so potent that a minute quantity can bring about vast changes in the body. In animal experiments, 3 parts per million has been found to inhibit an essential enzyme in heart muscle; only 5 parts per million has brought about necrosis or disintegration of liver cells; only 2.5 parts per million of the closely related chemicals dieldrin and chlordane did the same.
This is really not surprising. In the normal chemistry of the human body there is just such a disparity between cause and effect. For example [link widoczny dla zalogowanych], a quantity of iodine as small as two ten-thousandths of a gram spells the difference between health and disease. Because these small amounts of pesticides are cumulatively stored and only slowly excreted [link widoczny dla zalogowanych], the threat of chronic poisoning and degenerative changes of the liver and other organs is very real.
Scientists do not agree upon how much DDT can be stored in the human body. Dr. Arnold Lehman, who is the chief pharmacologist of the Food and Drug Administration [link widoczny dla zalogowanych], says there is neither a floor below which DDT is not absorbed nor a ceiling beyond which absorption and storage ceases. On the other hand, Dr. Wayland Hayes of the United States Public
Health Service contends that in every individual a point of equilibrium is reached, and that DDT in exces
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