Studies on the Photosynthetic Reaction. II. Sodium Formate and Urea Feeding Experiments with Nostoc muscorum.

Abstract
Cl4-labeled sodium formate and urea were fed to N. muscorum. The formate and urea were converted to carbonate by oxidation and hydrolysis, respectively. The resulting carbonate was assimilated in normal photosynthesis. Neither substance appears to have a significant role in the photo-synthetic process.