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《Marine Sciences》 2000-11
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EFFECTS OF NITROGEN, PHOSPHORUS CONCENTRATION AND RENEWAL RATE ON RECOVERY YIELDS OF Phaeodactylum tricornutum IN SEMICONTINUOUS CULTURES

ZHU Yi feng1 WU Song jie2 GUO Xiao qiang1(1Department of Fisheries, Ningbo University, 315211)(2Ningbo Fisheries Research Institute, 315010)  
This experiment was conducted to determine the dynamic effects of nitrogen, phosphorus concentration and renewal rate on recovery yields of Phaeodactylum tricornutum in semicontinuous cultures at room temperature by uniform design. The results demonstrated that nitrogen concentration ranging from 0.5 mg /L to 35.9 mg/L and phosphorus concentration ranging from 0.3 mg/L to 12.1 mg/L had no influences upon recovery yields during 16 d dilution, but 0.5 mg/L of nitrogen concentration was suggested before 8 d. Cell density decreased and growth rate increased while increasing renewal rate. The optimal renewal rate of 18.2% was postulated according to 16 d equation, and recovery yields of 66.7×104 cells per ml volume of culture per day were obtained with this renewal rate.
【CateGory Index】: S968
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