影响铅对真菌毒性的非生物因素。
Abiotic factors affecting the toxicity of lead to fungi.
作者信息
Babich H, Stotzky G
出版信息
Appl Environ Microbiol. 1979 Sep;38(3):506-13. doi: 10.1128/aem.38.3.506-513.1979.
Abstract
The toxicity of lead (Pb) to fungi in pure culture was influenced by several abiotic factors: pH, inorganic anions, clay minerals, and particulate (humic acid) and soluble organic matter. The toxicity of Pb was potentiated under acidic conditions (pH 5 and 6), and phosphate or carbonate anions reduced the toxicity, apparently as a result of the formation of sparingly soluble Pb salts. Clay minerals (montmorillonite greater than attapulgite greater than kaolinite) and particulate humic acid protected against the toxicity of Pb, presumably as the result of sorption, by cation exchange of the Pb to the exchange complexes, which reduced its availability for uptake by the fungi. Soluble organics, such as tryptone, yeast extract, cysteine, succinic acid, and increasing concentrations of neopeptone, also reduced the toxicity of Pb.
摘要
在纯培养中，铅（Pb）对真菌的毒性受多种非生物因素影响：pH值、无机阴离子、粘土矿物以及颗粒状（腐殖酸）和可溶性有机物。在酸性条件下（pH值为5和6），铅的毒性增强，而磷酸根或碳酸根阴离子可降低其毒性，这显然是由于形成了微溶性铅盐。粘土矿物（蒙脱石大于凹凸棒石大于高岭土）和颗粒状腐殖酸可防止铅的毒性，推测这是由于通过阳离子交换将铅吸附到交换络合物上，从而降低了真菌对其的吸收利用率。可溶性有机物，如胰蛋白胨、酵母提取物、半胱氨酸、琥珀酸以及浓度不断增加的新蛋白胨，也能降低铅的毒性。
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