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M J Larkin  Biological Sciences. The  Queen’s University of Belfast.

Role in geochemical nutrient cycles.

 Microorganisms play a role as:

PRIMARY PRODUCERS

BIODEGRADERS AND CONSUMERS

 Critical role in cycles of many elements;

Carbon and Oxygen cycle – oxygenases and oxygen fixation

Nitrogen cycle – nitrogenase - denitrification

Sulfur cycle – sulphate reduction

Phosphorus cycle

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