Several papers have already been published for answering the question whether or not the tricarboxylic acid cycle or the C4-dicarboxylic acid cycle plays a role in microorganisms, and a summarizing description of the subject is seen in Ajl's article(1). Karlson and Barker(2), for example, stated that the tricarboxylic acid cycle does not operate in Azotobacter agilis, Barron, Ardao and Hearon (...
