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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >QUANTIFICATION OF SMALL ENTHALPIC DIFFERENCES IN ANAEROBIC MICROBIAL METABOLISM - A CALORIMETRY-SUPPORTED APPROACH
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QUANTIFICATION OF SMALL ENTHALPIC DIFFERENCES IN ANAEROBIC MICROBIAL METABOLISM - A CALORIMETRY-SUPPORTED APPROACH

机译:厌氧微生物代谢中小全酶差异的量化-一种量热支持的方法

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摘要

A calorimetry-supported approach to the measurement of small enthalpic differences in microbial metabolism is presented. Anaerobic fermentations with the bacterium Zymomonas mobilis and the yeast Saccharomyces cerevisiae were carried out in a fermenter-calorimeter at a constant dilution rate (D=0.15 h(-1)). The glucose concentration of the reed was increased stepwise from 10 to 80 gl(-1). Salts, vitamins and trace elements were present in excess. Different steady state conditions were analysed. For Z. mobilis, specific production rates for ethanol, carbon dioxide and heat were three times higher than those measured for S. cerevisiae. If the glucose feed concentration exceeded 20 gl(-1) during the S. cerevisiae fermentations, glucose could be measured in the fermenter. Further increasing glucose concentrations of the feed caused higher specific ethanol, carbon dioxide and heat production rates, whereas the biomass yield Y-X/S decreased remarkably. This result can be explained as the Crabtree effect under anaerobic conditions and interpreted as metabolic uncoupling of anabolic biomass formation and catabolic energy substrate consumption. A futile cycle contributing to the heat production is considered to provide S. cerevisiae with a regulatory mechanism in the control of the flux of metabolites through the glycolytic pathway. [References: 30]
机译:提出了一种量热仪支持的方法来测量微生物代谢中小的焓差。在发酵罐量热仪中以恒定的稀释率(D = 0.15 h(-1))与运动发酵单胞菌和啤酒酵母酿酒酵母进行厌氧发酵。芦苇的葡萄糖浓度逐步从10增加到80 gl(-1)。盐,维生素和微量元素的含量过多。分析了不同的稳态条件。对于运动发酵单胞菌,乙醇,二氧化碳和热的比生产率比酿酒酵母所测定的高三倍。如果在酿酒酵母发酵过程中葡萄糖进料浓度超过20 gl(-1),则可以在发酵罐中测量葡萄糖。进料中葡萄糖浓度的进一步增加导致更高的比乙醇,二氧化碳和热量产生速率,而生物质产率Y-X / S显着降低。该结果可以解释为在厌氧条件下的Crabtree效应,并且可以解释为合成代谢生物质形成与分解代谢能量底物消耗的代谢解偶联。导致热量产生的无效循环被认为为酿酒酵母提供了通过糖酵解途径控制代谢物通量的调节机制。 [参考:30]

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