Kristjansson J K, Schönheit P
Institute of Biology, University of Iceland, Grensasvegur 12, 108, Reykjavik, Iceland.
Fachbereich Biologie/Mikrobiologie, Philipps-Universität Marburg, Lahnberge, D-3550, Marburg/Lahn, FRG.
Oecologia. 1983 Nov;60(2):264-266. doi: 10.1007/BF00379530.
The apparent K values for H of several phylogenetically distant strains of both methanogenic bacteria and sulfate-reducing bacteria were measured. The sulfate reducers had K values of about 2 μM whereas the K values of the methanogens were 6-20 μM. This indicates that probably all sulfate-reducing bacteria have a higher substrate affinity for H than the methanogenic bacteria. Difference in substrate affinity can thus account for the inhibition of methanogenesis from H and CO in sulfate-rich ecosystems (mainly saltwater marshes), where the H concentration is well below 5 μM. Possible explanations for this general phenomenon are discussed.
测定了几种系统发育关系较远的产甲烷菌和硫酸盐还原菌菌株对H的表观K值。硫酸盐还原菌的K值约为2μM，而产甲烷菌的K值为6 - 20μM。这表明，可能所有的硫酸盐还原菌对H的底物亲和力都高于产甲烷菌。因此，底物亲和力的差异可以解释在富含硫酸盐的生态系统（主要是咸水沼泽）中，H和CO产甲烷过程受到抑制的现象，在这些生态系统中，H浓度远低于5μM。文中讨论了这一普遍现象的可能解释。
