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Hydrogenesis in hyperthermophilic microorganisms: Implications for biofuels

Paper ID Volume ID Publish Year Pages File Format Full-Text
31894 44849 2008 11 PDF Available
Title
Hydrogenesis in hyperthermophilic microorganisms: Implications for biofuels
Abstract

Hydrothermal microbiotopes are characterized by the consumption and production of molecular hydrogen. Heterotrophic hyperthermophilic microorganisms (growth Topt⩾80 °C) actively participate in the production of H2 in these environments through the fermentation of peptides and carbohydrates. Hyperthermophiles have been shown to approach the theoretical (Thauer) limit of 4 mol of H2 produced per mole of glucose equivalent consumed, albeit at lower volumetric productivities than observed for mesophilic bacteria, especially enterics and clostridia. Potential advantages for biohydrogen production at elevated temperatures include fewer metabolic byproducts formed, absence of catabolic repression for growth on heterogeneous biomass substrates, and reduced loss of H2 through conversion to H2S and CH4 by mesophilic consortia containing sulfate reducers and methanogens. To fully exploit the use of these novel microorganisms and their constituent hydrogenases for biohydrogen production, development of versatile genetic systems and improvements in current understanding of electron flux from fermentable substrates to H2 in hyperthermophiles are needed.

Keywords
GAPDH, glyceraldehyde-3-phosphate dehydrogenase; PFL, pyruvate formate lyase; FHL, formate hydrogen lyase; POR, pyruvate ferredoxin oxidoreductase; Fd red, reduced ferredoxin; MBH, membrane-bound hydrogenase; EtOH, ethanolBiohydrogen; Pyrococcus furiosus;
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Publisher
Database: Elsevier - ScienceDirect
Journal: Metabolic Engineering - Volume 10, Issue 6, November 2008, Pages 394–404
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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