Effects of light intensity on nitrate and nitrite uptake and excretion by Chaetoceros curvisetus |
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Authors: | S. M. Anderson O. A. Roels |
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Affiliation: | (1) University of Texas Marine Science Institute, 78373 Port Aransas, Texas, USA;(2) Environmental Technology, Weyerhauesor Company, 98477 Tacoma, Washington, USA |
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Abstract: | Michaelis-Menten uptake kinetics were observed at all light intensities. With constant illumination, the Vmax and K1 in nitrate uptake over the natural light intensity range of 0 to 2000 E were 0.343 g-at NO3–N(g)-1 at protein-N h-1 and 26 E, respectively. Nitrate uptake was inhibited at higher light intensities. The Ks for nitrate uptake did not vary as a function of light intensity remaining relatively constant at 0.62 g-at NO3–N 1-1. With intermittent illumination, the Vmzx for light intensity in nitrate uptake over a light intensity range of 0 to 5000 E was 0.341 g-at NO3–N(g)-1-at protein-N h-1. No inhibition of nitrate uptake was observed at higher than natural light intensities. Chaetoceros curvisetus will probably never experience light inhibition of nitrate uptake under natural conditions. |
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