Jung, G A Influence of Purines and Pyrimidines on Cold Hardiness of Plants. III. Associated Changes in Soluble Protein and Nucleic Acid Content and Tissue pH. [electronic resource] - Plant physiology Dec 1967 - 1653-7 p. digital Publication Type: Journal Article ISSN: 0032-0889 Standard No.: 10.1104/pp.42.12.1653 doi