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Algae > Volume 11(2); 1996 > Article
Algae 1996;11(2): 243-246.
Increase of in vivo Nitrate Reductase Activity in Ulva pertusa Kjellman during Early Exposure
Bang-Ook June, Ik-Kyo Chung
Department of Biology, Kangnung National University, Department of Marine Science, Pusan National University
In vivo nitrate reductase activity increased up to 3-fold when the thalli of Ulva pertusa were exposed at low tide. But in vitro activity, nitrate uptake rate and the nitrogen content did not significantly change. The results suggest that increase of in vivo nitrate reductase activity does not come from thallus dehydration. Rather it seems that increase of in vivo nitrate reductase activity is the process that occurs before thallus dehydration during exposure and may allow quick metabolism of restored nitrate in the resubmerged thallus of Ulva pertusa.
Key words: desiccation, exposure, nitrate reductase activity, nitrate uptake, nitrogen content, Ulva pertusa

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