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606 bytes added ,  05:17, 31 August 2013
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Nutrition in bacteria are either '''autotrophs''' or '''heterotrophs'''.<br> Autotrophic bacteria are again divided into two groups;<br>
 
Nutrition in bacteria are either '''autotrophs''' or '''heterotrophs'''.<br> Autotrophic bacteria are again divided into two groups;<br>
 
(i) '''Photoautorophs''' trap solar energy for utilization CO2 and use H2S in place of H2O. Thus, O2 is never released.<br>
 
(i) '''Photoautorophs''' trap solar energy for utilization CO2 and use H2S in place of H2O. Thus, O2 is never released.<br>
(ii) '''Chemoautotrophs''' obtain energy from chemical by oxidation process for food synthesis and carbon from CO2.<br> This type include nitrifying bacteria, sulphur bacteria, iron bacteria etc.<br> Heterotrophs are also of two types- Photoheterotrophs and chemoheterotrophs. <br>Photoheterotrophs use light as energy source and an organic compound as source of carbon, e.g. Green and purple bacteria. <br>Chemoheterotrophs use chemical as energy and carbon may also be obtained from the same organic substances.<br> Most of the bacteria belong to this type.
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(ii) '''Chemoautotrophs''' obtain energy from chemical by oxidation process for food synthesis and carbon from CO2.<br> This type include nitrifying bacteria, sulphur bacteria, iron bacteria etc.<br> Heterotrophs are also of two types- Photoheterotrophs and chemoheterotrophs. <br>Photoheterotrophs use light as energy source and an organic compound as source of carbon, e.g. Green and purple bacteria. <br>Chemoheterotrophs use chemical as energy and carbon may also be obtained from the same organic substances.<br> Most of the bacteria belong to this type.<br>
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'''Nutritional types in bacterial metabolism
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'''
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{|class="wikitable"
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|-
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|'''Nutritional type'''
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|'''Source of energy'''
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|'''Source of carbon'''
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|'''Examples'''
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|-
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|Phototrophs
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|Sunlight
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|Organic compounds (photoheterotrophs) <br>or carbon fixation (photoautotrophs)
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|Cynobacteria, Green sulphur Bacteria
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|-
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|Lithotrophs
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|Inorganic Compounds
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|Organic compounds (lithoheterotrophs) <br>or carbon fixation (lithoautotrophs)
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|Thermodesulphobacteria,Nitrospirae
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|-
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|Organotrophs
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|Organic Compounds
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|Organic compounds (chemoheterotrophs) <br>or carbon fixation (chemoautotrophs)
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|Bacillus,Clostridium
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|-
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|}
    
===Learning objectives===
 
===Learning objectives===
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