硫酸盐
硫黄
化学
同位素分馏
硫酸盐还原菌
亚硫酸盐
分馏
氧气
细菌
硫化物
环境化学
无机化学
硫同位素
生物化学
色谱法
生物
有机化学
蛋氨酸
氨基酸
遗传学
作者
André Pellerin,Gilad Antler,Angeliki Marietou,Alexandra V. Turchyn,Bo Barker Jørgensen
出处
期刊:Fems Microbiology Letters
[Oxford University Press]
日期:2020-04-08
卷期号:367 (9)
被引量:11
标识
DOI:10.1093/femsle/fnaa061
摘要
ABSTRACT Temperature influences microbiological growth and catabolic rates. Between 15 and 35 °C the growth rate and cell specific sulfate reduction rate of the sulfate reducing bacterium Desulfococcus multivorans increased with temperature. Sulfur isotope fractionation during sulfate reduction decreased with increasing temperature from 27.2 ‰ at 15 °C to 18.8 ‰ at 35 °C which is consistent with a decreasing reversibility of the metabolic pathway as the catabolic rate increases. Oxygen isotope fractionation, in contrast, decreased between 15 and 25 °C and then increased again between 25 and 35 °C, suggesting increasing reversibility in the first steps of the sulfate reducing pathway at higher temperatures. This points to a decoupling in the reversibility of sulfate reduction between the steps from the uptake of sulfate into the cell to the formation of sulfite, relative to the whole pathway from sulfate to sulfide. This observation is consistent with observations of increasing sulfur isotope fractionation when sulfate reducing bacteria are living near their upper temperature limit. The oxygen isotope decoupling may be a first signal of changing physiology as the bacteria cope with higher temperatures.
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