铬对五氯酚降解菌生长和活性的影响

A. Wall, G. Stratton
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引用次数: 9

摘要

在液体细菌生长培养基中研究了铬(或铬酸盐,由CrO3提供)对五氯酚降解黄杆菌sp. (ATCC 53874)的影响。Cr6+浓度小于5.0 μ mL−1导致细菌生长完全抑制。96 h后计算的EC25、EC50和EC75分别为0.44、1.44和3.82 μ mL−1。在21天的孵育期间,Cr6+导致总细胞产量的不可逆降低。Cr6+还引起了该细菌在可测量的五氯酚(PCP)降解之前记录的滞后时间的增加。PCP完全降解至不可检测水平所需的总时间也有所增加。从10到100 μg mL−1检测的所有PCP浓度都有类似的反应。然而,在较低的五氯苯酚浓度下,反应更为明显。概述了这些数据与原位使用pcp降解细菌进行现场生物修复相关的意义。©1994 by John Wiley & Sons, Inc.。
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The effects of chromium on the growth and activity of a pentachlorophenol‐degrading bacterium
The effects of chromium (or chromate, as supplied by CrO3) on a pentachlorophenol-degrading Flavobacterium sp. (ATCC 53874) were examined in a liquid bacterial growth medium. Cr6+ concentrations ⩾ 5.0 μg mL−1 caused the complete inhibition of bacterial growth. The EC25, EC50, and EC75 calculated after 96 h of incubation were 0.44, 1.44, and 3.82 μg mL−1, respectively. Cr6+ caused an irreversible reduction in total cell yield during the 21-day incubation. Cr6+ also elicited an increase in the lag time recorded before there was measurable pentachlorophenol (PCP) degradation by this bacterium. There was also an increase in the overall time required for complete degradation of PCP to nondetectable levels. A similar response was noted with all PCP concentrations examined from 10 to 100 μg mL−1. However, a more pronounced response occurred at the lower PCP concentrations. The significance of these data relative to the in situ use of PCP-degrading bacteria for site bioremediation is outlined. © 1994 by John Wiley & Sons, Inc..
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