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Contents: The arginase inhibitor from sunflower seeds: purification and inhibitory properties; The variations in the content of triterpenoids in the developing flowers of Calendula officinalis L; Hydrolysis of 5-cyano, and decarboxylation of 5-carboxyuracils; Relationship between sensitivity to amytal inhibition and the content of nicotinamide nucleotides in rat liver mitochondria following some uncoupling treatments; Some properties of purified porcine pancreatopeptidase E; Effect of maleate on glutamate oxidation by rat liver mitochondria; The simulation by maleate of alpha-oxoglutarate exit from rat liver mitochondria; Evidence for tightly-bound zinc in leucine aminopeptidase from pig kidney; Intermediates in the synthesis of purines and pteridines: N-methylated 6-chlorouracils; Carboxylation of propionyl-CoA in erythromycin biosynthesis; Conformation of acid forms of poly C: temperature and ionic strength dependence of protonation of cytidine and cytidine-5'-phosphate; Electroreduction of halogenopyrimidines. Electrochemical reduction of 5-halogenoderivatives of uracil, its nucleosides and oligonucleotides; Photochemistry of 5-ethyluracil and its glycosides; and Regulation of lactose utilization in Aspergillus nidulans.