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Effect of inorganic sulfide on the growth and metabolism of Methanosarcina barkeri strain DM.

机译:无机硫化物对巴氏甲烷八叠球菌DM生长和代谢的影响。

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Minimal growth of Methanosarcina barkeri strain DM occurred when sulfide was omitted fromthe growth medium, and addition of either sodium sulfate or coenzyme M to sulfide-depleted media failed to restore growth. Optimal growth occurred in the presence of 1.25 mM added sulfide, giving a molar growth yield (YCH4) of 4.4 mg (dry weight) of cells per mmol of CH4 produced. Increasing sulfide to 12.5 mM led to decrease in YCH4 (1.9 mg [dry weight]/mmol of CH4), in the specific growth rate and in be intracellular levels of adenosine triphosphate. However, the specific rate of methane production increased. The data suggested that at elevated sulfide levels (12.5 mM) the decrease in YCH4 might be a result of an increase in the relative energy needed for maintnenace and of uncoupling of growth from energy production.
机译:当从生长培养基中去除硫化物时,巴氏甲烷八叠球菌菌株DM出现最小的生长,向贫硫化物的培养基中添加硫酸钠或辅酶M均无法恢复生长。在添加了1.25 mM硫化物的情况下发生了最佳的生长,每摩尔产生的CH4的摩尔生长产量(YCH4)为4.4 mg(干重)细胞。硫化物增加至12.5 mM导致YCH4(1.9 mg [干重] / mmol CH4),比生长速率和细胞内三磷酸腺苷水平的降低。然而,甲烷生产的特定速率增加了。数据表明,在硫化物水平升高(12.5 mM)时,YCH4的减少可能是维护所需相对能量增加以及增长与能量生产脱钩的结果。

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