Nitrogen cycle modulation

Present data support the hypothesis that chitinase enzyme is inducible in estuarine sediment by natural causes, i.e., exuvial input. Biodeposit formers, such as the oyster, participate in the apparent concentration of chitinase hydrolytic activities by virtue of their feeding processes. These results suggest organism-modulated chitinase dynamics and may be useful indicators of chitin roles in the overall marine carbon and nitrogen cycles. 

Any change in enviromnental conditions such as light, temperature, water and nutrient availability may modulate the photochemical reactions of photosynthesis to a different extent than the biochemical reactions involved in carbon reduction cycle, photorespiration, and nitrogen and sulphur assimilation. Consequently, these environmental changes will modulate excitation pressure. Excitation pressure reflects an imbalance between energy absorbed through photochemistry and energy utilized... 

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