Re: [環生] 生物累積與生物擴大

看板geography101作者sarcasm時間13年前 (2011/01/12 23:07)推噓3(3推 0噓 4→)

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花幾分鐘隨便亂翻的有錯別怪我XD ※ 引述《k8k12 (小昱)》之銘言： : 如標題可以參考下列原文 : A third factor for some substances is bioaccumlation, in which some : molecules are absorbed and stored in specific organs or tissues at higher than : normal levels. As a consequence, a chemical found at a fairly low : concentration : in the environment can build up to a harmful level in certain organs and : tissues. 第三個因素是生物累積，指的是比平均更多的分子被吸收並儲存在特定器官或組織中，使原本環境中含量極低的化學物質在器官和組織中累積達到有害的程度。 : A related factor is biomagnification, in which levels of some potential : toxins in the environment become magnified as they pass through food chains : and webs. Organisms at low trophic levels might ingest only small amounts of : a toxin, but each animal on the next trophic level up that eats many of those : organisms will take in increasingly larger amounts of that toxin. Examples of : chemicals that can be biomagnified include long-lived, fat-soluble organic : compounds such as DDT, PCBs (oily chemicals used in electrical transformers), : and some radioactive isotopes (such as strontium-90) 另一相關要素是生物放大，指的是環境中潛在的毒物經過食物鏈和食物網後被放大，層級較低的生物可能只會吸收少量毒素，但被下一層生物大量食入後便會在其體內累積更大量的毒素。具有放大效應的化學物質包含持久脂溶性有機化合物，如DDT、PCBs(用於變壓器的油性化學物質)、和部分輻射性同位素(如鍶九十)。 : 大家考試加油! -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.112.4.195

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sevenchao

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