The long‐term survival of mice protected from 8MeV electron irradiation by combined treatment with cysteamine, hypoxia, syngeneic bone marrow and antibiotics

A number of blue-green algae and photosynthetic bacteria synthesize arginine from glutamate via acetylated intermediates.Cell-free extracts of these photosynthetic microorganisms contain an N-acetyl glutamate phosphokinase, which is specifically inhibited by arginine.They also contain a transacetylase which forms ornithine from aN-acetyl ornithine and glutamate.The transacetylase appears to be specific for L-glutamate.Arginine synthesis and its regulation by feedback inhibition in photosynthetic microorganisms differ from that in Escherichia coli and other Enterobacteriaceae.