NDLI: Inhibitory Effects of Phenolic Ecotoxicants on Photobacteria at Various pH Values

Content Provider	Springer Nature Link
Author	Kouts, V. V. Il'ina, Yu. M. Ismailov, A. D. Netrusov, A. I.
Copyright Year	2005
Abstract	Kinetic characteristics of light emission by intact cells of photobacteria Photobacterium phosphoreum and Vibrio harveyi were studied (at pH 5.5, 7.0, and 8.0), as well as inhibitory effects of 2,4-di- and 2,4,5-triphenoxyacetic acids (2,4-D and 2,4,5-T), pentachlorophenol (PCP), and 2,6-dimethylphenol (2,6-DMP) (at the same pH values). The emission kinetics lacked a steady state, irrespective of pH. At pH 5.5, luminescence decayed exponentially in the 60-s range; at pH 7.0 and 8.0, a 5-min luminescence activation was observed. The respiratory activity of the cells decreased by more than an order of magnitude at pH 5.5 (compared to the levels observed at pH 7.0 and 8.0). The inhibitory effects of 2,4-D, 2,4,5-T, and PCP differed by one to two orders of magnitude, depending on pH. Maximum cell sensitivity to these compounds appeared at pH 5.5; minimum sensitivity, at pH 8.0. The effect of 2,6-DMP was pH-independent. The inhibitory effect was determined by the hydrophobicity of the molecule and pK values of the toxicants. At all pH values, substrate-depleted cells of photobacteria were more sensitive to chlorophenolic compounds than cells supplied with energy.
Starting Page	563
Ending Page	569
Page Count	7
File Format	PDF
ISSN	00036838
Journal	Applied Biochemistry and Microbiology
Volume Number	41
Issue Number	6
e-ISSN	16083024
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2005-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Medical Microbiology Biochemistry Microbiology
Content Type	Text
Resource Type	Article
Subject	Biochemistry Applied Microbiology and Biotechnology

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