Effect of sediments on the survival of Escherichia coli in marine waters
Effect of sediments on the survival of Escherichia coli in marine waters
复制标题
沉积物对海水中大肠杆菌存活的影响
DOI：
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发表时间：
1976
影响因子：
4.4
通讯作者：
John S. McLEOD
中科院分区：
文献类型：
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作者：
C. Gerba;John S. McLEOD
大肠杆菌是一种粪便大肠菌群，当存在沉积物物质时，大肠杆菌在未消毒的天然海水中存活的时间比在单独的海水中存活的时间更长，并且至少有一次观察到它的生长。这种肠道细菌在经过高压灭菌的天然海水和从接收生活废物的地区提取的高压灭菌沉积物中数量迅速增加，即使海水的盐度高达34克/公斤。然而，在高压灭菌的海水中，生长总是更加缓慢，并且从未达到与存在沉积物时观察到的数量一样高。结果表明，经过高压灭菌或加入人工海水后，沉积物中的营养物质容易被洗脱，而与未经消毒的天然海水混合时，沉积物中的营养物质几乎没有被洗脱。大肠杆菌在沉积物中存活的时间较长，归因于沉积物中存在的有机物含量高于毛衣。这些实验室结果在一定程度上可以解释为什么在河口沉积物中发现的大肠菌群和粪便大肠菌群的数量多于在野外地点的覆盖水中发现的大肠菌群。
Escherichia coli, a fecal coliform, was found to survive for longer periods of time in unsterile natural seawater when sediment material was present than in seawater alone, and at least on one occasion growth was observed to occur. This enteric bacterium was found to increase rapidly in number in autoclaved natural seawater and autoclaved sediment taken from areas receiving domestic wastes, even when the seawater had salinities as high as 34 g/kg. However, in autoclaved seawater, growth was always more gradual and never reached numbers as high as those observed when sediment was present. It was found that nutrients were easily eluted from the sediment after autoclaving or upon addition to artificial seawater, but little elution occured during mixing of the sediments with unsterile natural seawater. The longer survival of E. coli in the sediment is attributed to the greater content of organic matter present in the sediment than the sweater. These laboratory results, in part, could explain why on a volume basis larger numbers of coliforms and fecal coliforms and fecal coliforms were found in estuarine sediments than the overlaying water at field sites.