Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/107692
Title: Growth of Chlorella outdoors in a changing light environment
Authors: Ma, X.
Chen, K.-W.
Lee, Y.-K. 
Keywords: Carbon and nitrogen output
Changing irradiance
Chlorella
Enclosed tubular photobioreactor
Outdoor culture
Issue Date: 1997
Citation: Ma, X., Chen, K.-W., Lee, Y.-K. (1997). Growth of Chlorella outdoors in a changing light environment. Journal of Applied Phycology 9 (5) : 425-430. ScholarBank@NUS Repository.
Abstract: Chlorella zofingiensis was grown in semi-continuous culture in an outdoor enclosed tubular photobioreactor. At the quasi-steady state, the response of the culture to changes in photosynthetically active radiance (PAR) was studied by following closely the dissolved O2 concentration, biomass concentration and the carbohydrate and protein content of the biomass. Generally, O2 production and the output of carbon and nitrogen of the biomass showed a linear correlation with incident PAR, suggesting that the cultures were light-limited. Photoinhibition was not observed in high light adapted cultures (on a sunny day), but was observed in shade adapted cultures (cloudy days) when there was a sudden four-fold increase in PAR. The output rate of biomass nitrogen observed on sunny days was, however, lower than that measured on cloudy days. On sunny days, a rapid increase in the C/N ratio of the biomass was seen. We attribute the increase in C/N ratio on sunny days to a slower response of protein synthesis to big increases in PAR, compared to carbohydrate synthesis. The possible influence of this C and N response pattern on the productivity of outdoor algal cultures is discussed.
Source Title: Journal of Applied Phycology
URI: http://scholarbank.nus.edu.sg/handle/10635/107692
ISSN: 09218971
Appears in Collections:Staff Publications

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