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Effect of Tricarboxylic Acid Cycle Intermediates and Related Compounds on the Respiratory Rate of Urostyla cristata and Colpoda cucullus *
Author(s) -
GONIAKOWSKA L.,
PIGON A.
Publication year - 1968
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.1550-7408.1968.tb02200.x
Subject(s) - malonate , glyoxylic acid , respiration , citric acid cycle , chemistry , biochemistry , metabolism , biology , botany
SYNOPSIS. The respiratory rates of vegetative forms of Urostyla cristata and vegetative and encysted Colpoda cucullus were measured in balanced salt solution and after addition of Na salts of various organic acids, including Krebs‐ and glyoxylic‐cycle intermediates. The results point to some peculiarities in Urostyla metabolism; it was poisoned by succinate—an effect partly abolished by malonate; respiration was stimulated by malonate. Respiration of vegetative Colpoda was accelerated by Krebs‐ and glyoxylic‐acid cycle intermediates. Most of these intermediates inhibited respiration of Urostyla. In experiments of short duration respiration of encysted Colpoda was not stimulated by these intermediates.