Abstract
A variety of microorganisms can evolve H2 according to the following equation: 2H+ + 2e ⇄ H2. These include strict or facultative anaerobic bacteria, aerobic bacteria, blue-green and green algae. In aerobic bacteria and in blue-green algae H2 formations are restricted to N2-fixing species. Strict and facultative anaerobic bacteria as well as green algae (Chlamydomonas, Scenedesmus, Chlorella) form the gas only under O2 exclusion in the cultures. There is no clear-cut demonstration for H2-formation by mosses, ferns and higher plants. Lists of the H2-forming organisms are compiled in Mortenson and Chen1 and Schlegel and Schneider2.
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