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Biofuels in Perspective

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viii Contents<br />

11 Biological Hydrogen Production by Anaerobic Microorganisms 197<br />

Servé W.M. Kengen, Heleen P. Goorissen, Marcel Verhaart,<br />

Alfons J.M. Stams, Ed W.J. van Niel and Pieternel A.M. Claassen<br />

Abbreviations 197<br />

11.1 Introduction 198<br />

11.2 Hydrogen Formation <strong>in</strong> Natural Ecosystems 198<br />

11.3 Thermodynamics of Hydrogen Formation 199<br />

11.4 Enzymology 204<br />

11.5 Enterobacteria 206<br />

11.6 The Genus Clostridium 207<br />

11.7 The Genus Caldicellulosiruptor 208<br />

11.8 The Genus Thermoanaerobacter 210<br />

11.9 The Genus Thermotoga 211<br />

11.10 The Genus Pyrococcus/Thermococcus 212<br />

11.11 Approaches for Improv<strong>in</strong>g Hydrogen Production 213<br />

11.12 Conclud<strong>in</strong>g Remarks 214<br />

References 215<br />

12 Improv<strong>in</strong>g Susta<strong>in</strong>ability of the Corn–Ethanol Industry 223<br />

Paul W. Gallagher and Hose<strong>in</strong> Shapouri<br />

12.1 Introduction 223<br />

12.2 Energy Balance 224<br />

12.3 Crop Production and Greenhouse Gas Emissions 226<br />

12.4 CO2 Adjustment <strong>in</strong> a Chang<strong>in</strong>g Ethanol Industry 228<br />

12.5 Conclusions 232<br />

References 233<br />

Index 235

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