In the work by Stone and Wilson (1952) on the oxidative activity of Azotobacter extracts, the reactions of the citric acid cycle (Krebs, 1940) apparently offer the best mechanism for the results, but the slow oxidation of succinic acid remains unexplained. A clue to the solution is suggested by the work of Das (1937) and later, Pardee and Potter (1948), who found that oxalacetate in minute conc...
