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0IntroductionHydrogenase(H2ase)has beeninvestigatedin a va-riety of bacterial groups since it was firstly reported in1931[1-3].Cyanobacteria contain two different types ofH2ase,uptake H2ase(EC1.12.7.2)and bidirectional orreversible H2ase(EC1.12.1.12).Uptake H2ase is in-duced under N2-fixing situation,mainly confinedin hete-rocysts.Bidirectional H2ase is constitutively synthesized,active in both heterocysts and vegetative cells present inboth N2-fixing and non-N2-fixing conditions.This en… 相似文献
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