悬浮细菌群体对七种酰胺的微生物降解作用。
Microbial degradation of seven amides by suspended bacterial populations.
作者信息
Steen W C, Collette T W
机构信息
Environmental Research Laboratory, U.S. Environmental Protection Agency, Athens, Georgia 30613-7799.
出版信息
Appl Environ Microbiol. 1989 Oct;55(10):2545-9. doi: 10.1128/aem.55.10.2545-2549.1989.
Microbial transformation rate constants were determined for seven amides in natural pond water. A second-order mathematical rate expression served as the model for describing the microbial transformation. Also investigated was the relationship between the infrared spectra and the second-order rate constants for these amides. Second-order rate constants (k2) ranged from a low of 2.0 X 10(-14) to a high of 1.1 X 10(-9) liters organism-1 h-1 for niclosamide (2',5-dichloro-4'-nitrosalicylanilide) and propachlor (2-chloro-N-isopropylacetanilide), respectively. The mechanism of degradation (i.e., microbially mediated hydrolysis) of the amides was consistent with that of other organic chemicals previously studied in a variety of natural waters. Preliminary investigations indicate that temporal variations in measured second-order rate constants are small. A simple linear regression of the infrared carbonyl-stretching frequency with log K2 gave a correlation coefficient (r2) of 0.962.
测定了天然池塘水中七种酰胺的微生物转化速率常数。采用二级数学速率表达式作为描述微生物转化的模型。还研究了这些酰胺的红外光谱与二级速率常数之间的关系。对于氯硝柳胺（2',5-二氯-4'-硝基水杨酰苯胺）和毒草胺（2-氯-N-异丙基乙酰苯胺），二级速率常数（k2）分别低至2.0×10⁻¹⁴和高至1.1×10⁻⁹升·生物体⁻¹·小时⁻¹。酰胺的降解机制（即微生物介导的水解）与先前在各种天然水体中研究的其他有机化学品的降解机制一致。初步研究表明，测得的二级速率常数的时间变化很小。红外羰基伸缩频率与log K2的简单线性回归得到的相关系数（r²）为0.962。
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