Growth-inhibitory effects of sulfonamides at different pH: dissimilar susceptibility patterns of a soil bacterium and a test bacterium used for antibiotic assays.
Growth-inhibitory effects of sulfonamides at different pH: dissimilar susceptibility patterns of a soil bacterium and a test bacterium used for antibiotic assays.
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不同 pH 值下磺胺类药物的生长抑制作用:土壤细菌和用于抗生素测定的测试细菌的不同敏感性模式
DOI:
10.1016/j.chemosphere.2008.02.041
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发表时间:
2008
期刊:
影响因子:
8.8
通讯作者:
Groeneweg J
中科院分区:
文献类型:
--
作者:
Tappe W;Zarfl C;Kummer S;Burauel P;Vereecken H;Groeneweg J
The ionic speciation of sulfonamides is pH-driven and this may be crucial for their bioavailability and sorption to soil constituents, as well as for their uptake into bacterial cells. The inhibition behaviour of a bacterial test strain (Pseudomonas aeruginosa; DSM 1117), which was grown in the presence of different concentrations of 8 sulfonamides at pH values from 5 to 8, could be predicted by models that take the speciation of sulfonamides in- and outside of bacterial cells into account. Assuming a pH of 7.5 inside the cells (pH homeostasis), the strongest inhibition was predicted for the lowest external pH and for sulfonamides with the lowest pKavalues. Growth experiments with Ps. aeruginosa basically reflected this predicted behaviour. However, Pantoea agglomerans – a bacterial strain isolated from arable soil – behaved surprisingly different regarding its pH dependency: all sulfonamides showed the strongest effects at pH 7 to 8 instead of being most effective at lowest pH, although the pKadependencies followed the same pattern. Experimental and modeling results could be brought into good agreement for P. agglomerans if the cell-internal pH was admitted to approximate the external pH instead of implying pH homeostasis for modeling calculations. Thus, besides the actual concentration of sulfonamides, the pH dependent mode of reaction of different bacteria to sulfonamides may additionally govern the population dynamics in soils.
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影响因子:
6.1
作者:
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通讯作者:
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影响因子:
2.3
作者:
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通讯作者:
W. Köster
DOI:
--
发表时间:
1987
期刊:
Antibiotics and Chemotherapy
影响因子:
--
作者:
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通讯作者:
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影响因子:
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作者:
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通讯作者:
B. Karger
DOI:
--
发表时间:
2005
期刊:
Medical Microbiology and Immmunology
影响因子:
--
作者:
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通讯作者:
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