Andersen S R, Sandaa R A
Department of General Microbiology, University of Copenhagen, Denmark.
Appl Environ Microbiol. 1994 Mar;60(3):908-12. doi: 10.1128/aem.60.3.908-912.1994.
Tetracycline-resistant gram-negative bacteria were isolated from four different marine sediments in Scandinavia and analyzed with DNA probes for the determinant classes A to E. Colony hybridizations of 429 isolates revealed that class E is the dominating resistance determinant in these marine sediments. Comparison of fecally polluted and unpolluted sediments showed few determinant classes in unpolluted sediment and a complex composition of several determinant classes in polluted sediment. Total DNA extraction and analysis with DNA probes for determinant classes A to E resulted in no hybridization signal, because of the low number of gram-negative tetracycline-resistant bacteria. Identification of class E isolates revealed that this determinant is present not only in Aeromonas hydrophila, Escherichia coli, and Vibrio salmonicida but also in additional strains.
从斯堪的纳维亚半岛的四种不同海洋沉积物中分离出耐四环素革兰氏阴性菌,并用DNA探针分析了A至E类决定簇。对429株分离菌进行菌落杂交显示,E类是这些海洋沉积物中主要的耐药决定簇。对受粪便污染和未受污染沉积物的比较表明,未受污染沉积物中的决定簇类别较少,而受污染沉积物中则有几种决定簇类别的复杂组合。由于耐四环素革兰氏阴性菌数量较少,用A至E类决定簇的DNA探针进行总DNA提取和分析未产生杂交信号。对E类分离菌的鉴定表明,这种决定簇不仅存在于嗜水气单胞菌、大肠杆菌和杀鲑弧菌中,还存在于其他菌株中。