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|Title:||Nitrogen uptake kinetics of freshly isolated zooxanthellae|
|Authors:||Wafar, M V M|
Kumar, R Raj
|Abstract:||Zooxanthellae freshly isolated from the coral host Pocillopora damicornis exhibited substrate-saturable uptake kinetics for ammonium, nitrate and urea. Maximum uptake velocity for ammonium [10. 1 nmol. (mug chl-a).-1h-1] was greater than that for nitrate [2.8 nmol.(mug chl-a).-1h-1] and urea [0.37 nmol. (mug chl-a).-1h-1]. Half-saturation constants for uptake of the three nitrogen compounds were in the range of 10-15 mumol.l-1. Generally, uptake of any one nitrogen substrate appears to be inhibited by the other 2 substrates when the latter are present in higher concentrations. The observed interactions can be explained by the uncompetitive model. These results are interpreted as indicative of a simultaneous uptake of all 3 nitrogen compounds by the zooxanthellae.|
|ISSN:||0975-1033 (Online); 0379-5136 (Print)|
|Appears in Collections:||IJMS Vol.22(2) [June 1993]|
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