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GROWTH AND EXCRETION IN PLANKTONIC ALGAE AND BACTERIA 1
Author(s) -
Nalewajko C.,
Lean D. R. S.
Publication year - 1972
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1972.tb04049.x
Subject(s) - chlorella pyrenoidosa , biology , algae , navicula , bacteria , anabaena , botany , plankton , fractionation , extracellular , photosynthesis , sephadex , chlorella , photobioreactor , cyanobacteria , food science , biochemistry , ecology , chromatography , chemistry , enzyme , genetics , biofuel
SUMMARY In short‐term experiments using cultures of Chlorella pyrenoidosa, Anabaena flos‐aquae, Asterionella formosa , and Navicula pelliculosa , both the proportion of photosynthetic products released from cells and the composition of these products altered, with age. In the first 3 species, percentage extracellular release values increased with increasing growth rates but the reverse trend was shown by Navicula . Fractionation of filtrates using Sephadex indicated that, in general, larger molecular weight compounds became predominant as cultures aged. Also a time‐dependent shift in a similar direction occurred in cultures of all ages. In several lakes a predominance of large molecular weight compounds was apparent in filtrates even from short‐term experiments. Filtrates of mixed cultures of planktonic bacteria growing on 14 C glycolate were found to contain, large molecular weight organic compounds. It was demonstrated that in nonaxenic cultures of algae and in lake water, bacteria utilize low molecular weight extracellular metabolites of algal origin and larger molecular weight compounds are formed.