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首页> 外文期刊>Journal of bacteriology >Ethanol production by thermophilic bacteria: metabolic control of end product formation in Thermoanaerobium brockii.
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Ethanol production by thermophilic bacteria: metabolic control of end product formation in Thermoanaerobium brockii.

机译：嗜热细菌产生的乙醇：代谢控制在嗜热厌氧菌中终产物的形成。

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Specific changes in the chemical and microbial composition of Thermoanaerobium brockii fermentations were compared and related to alterations of process rates, end product yields, and growth parameters. Fermentation of starch as compared with glucose was associated with significant decreases in growth rate and intracellular fructose-1,6-bisphosphate concentration and with a dramatic increase in the ethanol/lactate product ratio. Glucose or pyruvate fermentation in the presence of acetone was correlated with increased substrate consumption, growth (both rate and yield), acetate yield, and quantitative reduction of acetone to isopropanol in lieu of normal reduced fermentation products (i.e., H2, ethanol, lactate). Acetone altered pyruvate phosphoroclastic activity of cell extracts in that H2, lactate, and ethanol levels decreased, whereas the acetate concentration increased. Glucose fermentation in the presence of exogenous hydrogen was associated with inhibition of endogenous H2 production and either increased ethanol/acetate product ratios and decreased growth at less than 0.5 atm (51 kPa) of H2 or total growth inhibition at 1.0 atm (102 kPA). The effects of exogenous hydrogen on glucose fermentation were totally reversed by the addition of acetone. Glucose fermentation in coculture with Methanobacterium thermoautotrophicum correlated with increased growth (both rate and yield), acetate yield, and the formation of methane in lieu of monoculture reduced products. In coculture, but not monoculture, T. brockii grew on ethanol as the energy source, and acetate and methane were the end products as a direct consequence of hydrogen consumption by the methanogen.
机译：比较了布氏嗜热厌氧菌发酵的化学和微生物组成的特定变化，并将其与加工速率，终产物产率和生长参数的改变相关。与葡萄糖相比，淀粉的发酵与生长速率和细胞内1,6-二磷酸果糖浓度的显着降低以及乙醇/乳酸产物比率的急剧增加有关。丙酮存在下的葡萄糖或丙酮酸发酵与底物消耗，生长（速率和产率），乙酸盐产率增加以及丙酮取代异丙醇定量还原以代替正常还原的发酵产物（例如，H2，乙醇，乳酸）相关。 。丙酮改变了细胞提取物的丙酮酸磷碎裂活性，原因是H2，乳酸和乙醇含量降低，而乙酸盐浓度升高。在存在外源氢的情况下进行葡萄糖发酵与抑制内源性H2产生有关，或者增加了乙醇/乙酸盐产物的比率，并降低了H2浓度低于0.5 atm（51 kPa）时的生长，或者抑制了1.0 atm（102 kPA）时的总生长。添加丙酮可以完全消除外源氢对葡萄糖发酵的影响。与嗜热自养甲烷甲烷杆菌共培养的葡萄糖发酵与增长（速率和产量），乙酸盐产率以及甲烷的形成相关，以代替单一培养的还原产物。在共培养而非单培养中，布罗氏衣原体以乙醇为能源生长，而乙酸盐和甲烷是最终产物，是产甲烷菌消耗氢的直接结果。

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