无机硫化物对巴氏甲烷八叠球菌DM菌株生长和代谢的影响。
Effect of inorganic sulfide on the growth and metabolism of Methanosarcina barkeri strain DM.
作者信息
Mountfort D O, Asher R A
出版信息
Appl Environ Microbiol. 1979 Apr;37(4):670-5. doi: 10.1128/aem.37.4.670-675.1979.
Abstract
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.
摘要
当生长培养基中不含硫化物时，巴氏甲烷八叠球菌菌株DM的生长极少，并且向不含硫化物的培养基中添加硫酸钠或辅酶M均无法恢复其生长。在添加1.25 mM硫化物的情况下生长最佳，每产生1 mmol甲烷，细胞的摩尔生长产率（YCH4）为4.4 mg（干重）。将硫化物浓度增加到12.5 mM会导致YCH4降低（1.9 mg [干重]/mmol甲烷）、比生长速率降低以及细胞内三磷酸腺苷水平降低。然而，甲烷产生的比速率增加。数据表明，在高硫化物水平（12.5 mM）下，YCH4降低可能是维持所需相对能量增加以及生长与能量产生解偶联的结果。
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