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Photofermentation is the fermentative conversion of organic substrate to biohydrogen manifested by a diverse group of photosynthetic bacteria by a series of biochemical reactions involving three steps similar to anaerobic conversion. Photofermentation differs from dark fermentation because it only proceeds in the presence of light.

For example photo-fermentation with Rhodobacter sphaeroides SH2C (or many other purple non-sulfur bacteria[1]) can be employed to convert small molecular fatty acids into hydrogen[2] and other products.

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  1. ^ Redwood MD, Paterson-Beedle M & Macaskie LE (2008). Integrating dark and light biohydrogen production strategies: towards the hydrogen economy. Rev Environ Sci Bio/Technol in press. doi:10.1007/s11157-008-9144-9
  2. ^ High hydrogen yield from a two-step process of dark-and photo-fermentation of sucrose

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