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Regulation by Ammonium of Variation in Heterotrophic CO 2 Fixation by Euglena gracilis During Growth Cycles *
Author(s) -
PEAK J. G.,
PEAK M. J.
Publication year - 1977
Publication title -
the journal of protozoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 0022-3921
DOI - 10.1111/j.1550-7408.1977.tb04772.x
Subject(s) - euglena gracilis , heterotroph , ammonium , carbon fixation , nitrogen fixation , strain (injury) , biology , mixotroph , botany , biochemistry , bacteria , chemistry , photosynthesis , organic chemistry , gene , genetics , anatomy , chloroplast
SYNOPSIS Heterotrophic (dark) CO 2 fixation by Euglena gracilis strain Z varies with phase of batch culture growth and mode of nutrition. Increases in the fixation during growth cycles correlate closely with the depletion of exogenous NH 4 * from the medium during growth. It is demonstrated that exogenous NH 4 + regulates a component of heterotrophic CO 2 fixation and that another component is independent of NH 4 + . This is true for cells grown heterotrophically (glucose, dark), autotrophically (CO 2 , light) and for a permanently bleached strain ( E. gracilis SB3). Some kinetics of the NH 4 + regulation are presented.