Harrison Joe J, Ceri Howard, Stremick Carol, Turner Raymond J
Department of Biological Sciences, University of Calgary, 2500 University Drive N.W., Calgary, Alta., Canada T2N 1N4.
FEMS Microbiol Lett. 2004 Jun 15;235(2):357-62. doi: 10.1016/j.femsle.2004.05.005.
This study compares Staphylococcus aureus ATCC 29213 and Pseudomonas aeruginosa ATCC 27853 biofilm and planktonic cell susceptibility to the selenium and tellurium oxyanions selenite (SeO3(2-)), tellurate (TeO4(2-)), and tellurite (TeO3(2-)). P. aeruginosa planktonic and biofilm cultures reduced the selenium and tellurium oxyanions to orange and black end-products (respectively) and were equally tolerant to killing by these metalloid compounds. S. aureus planktonic cell cultures processed these metalloid oxyanions in a similar way, but the corresponding biofilm cultures did not. S. aureus biofilms were approximately two and five times more susceptible to killing by tellurate and tellurite (respectively) than the corresponding planktonic cultures. Our data indicate that the means of reducing metalloid oxyanions may differ between the physiology displayed in biofilm and planktonic cultures of the same bacterial strain.
本研究比较了金黄色葡萄球菌ATCC 29213和铜绿假单胞菌ATCC 27853生物膜及浮游细胞对硒和碲的含氧阴离子亚硒酸盐(SeO3(2-))、碲酸盐(TeO4(2-))和亚碲酸盐(TeO3(2-))的敏感性。铜绿假单胞菌的浮游和生物膜培养物分别将硒和碲的含氧阴离子还原为橙色和黑色终产物,并且对这些类金属化合物的杀伤具有同等耐受性。金黄色葡萄球菌的浮游细胞培养物以类似方式处理这些类金属含氧阴离子,但相应的生物膜培养物则不然。金黄色葡萄球菌生物膜对碲酸盐和亚碲酸盐的杀伤敏感性分别比相应的浮游培养物高约两倍和五倍。我们的数据表明,同一菌株的生物膜和浮游培养物所展现的生理特性在还原类金属含氧阴离子的方式上可能存在差异。