The Role of Vitamins and Micronutrient Elements in the Nutrition of the Apical Meristem of Pea Roots.

determination of the intracellular location of enzymes. Bot. Gaz. 114: 130-134. 1953. 14. HANSON, E. A. A note on the metabolism of chloroplast protein. Australian Jour. Exptl. Biol. Med. Sci. 19: 157-159. 1941. 15. HOLDEN, MARGAREr. The fractionation and enzymatic breakdown of some phosphorus compounds in leaf tissue. Biochem. Jour. 51: 433-442. 1952. 16. KROSSING, G. Versuche zur Lokalisation einiger Fermente in den Verschiedenen Zellbestandteilen der Spinatbliitter. Biochem. Z. 305: 359-373. 1940. 17. LATIES, G. G. The dual role of adenylate in the mitochondrial oxidations of a higher plant. Physiol. Plantarum 6: 199-214. 1953. 18. MANDELS, MARY HICKOX. A study of the chloroplasts of normal and chlorotic leaves of bean and tobacco plants. Thesis, Cornell University, Ithaca, New York. 1947. 19. MCCLENDON, J. H. The intracellular localization of enzymes in tobacco leaves. I. Identification of components of the homogenate. Amer. Jour. Bot. 39: 275-282. 1952. 20. MCCLENDON, J. H. The intracellular localization of enzymes in tobacco leaves. II. Cytochrome oxidase, catalase, and polyphenol oxidase. Amer. Jour. Bot. 40: 260-266. 1953. 21. METZNER, H. Cytochemische Untersuchungen fiber das Vorkommen von Nukleinsaiiren in Chloroplasten. Biol. Zentr. 71: 257-272. 1952. 22. MILLERD, ADELE, BONNER, J., AXELROD, B., and BANDURSKI, R. Oxidative and phosphorylative activity of plant mitochondria. Proc. Nat. Acad. Sci. Wash. 37: 855-862. 1951. 23. NAKAMURA, H. Uber die quantitativen beziehungen zwischen der katalase in chloroplasten und dem chlorophyll, nebst einigen bemarkungen fiber die rolle der katalase in assimilationsvorgang. Japan. Jour. Bot. 11: 221-230. 1941. 24. NEISH, A. C. Studies on chloroplasts. II. Their chemical composition and the distribution of certain metabolites between the chloroplasts and the remainder of the leaf. Biochem. Jour. 33: 300-308. 1939. 25. OGUR, M. and ROSEN, GLORIA. The nucleic acids of plant tissues. I. The extraction and estimation of desoxypentose nucleic acid and pentose nucleic acid. Arch. Biochem. 25: 262-276. 1950. 26. PARKER, G. A study of the breakdown of ribonucleic acid in tobacco leaf extracts. Biochem. Jour. 51: 389-399. 1952. 27. RABINOWITCH, E. I. Photosynthesis and Related Processes. Vol. I. Interscience Publishers, Inc., New York. 1945. 28. ROSENBERG, A. J. and DUcET, G. Activite cytochrome-oxidasique chez l'epinard. Compt. rend. acad. sci. Paris 229: 391-392. 1949. 29. SAYVELL, L. G. and CUNNINGHAM, B. B. Determination of iron, colorimetric o-phenanthroline method. Ind. Eng. Chem. Anal. Ed. 9: 67-69. 1937. 30. SCHNEIDER, W. C. and HoGEBOOM, G. H. Cytochemical studies of mammalian tissues: the isolation of cell components by differential centrifugation: a review. Cancer Res. 11: 1-22. 1951. 31. SISAKYAN, N. M. and FILIPOVITCH, I. J. Cytochrome oxidase of isolated plastids. (In Russian). Doklady Akad. Nauk. S.S.S.R. 67: 517-520. 1949. 32. SPIKES, J. D., LUMRY, R., EYRING, H., and WAYRYNEN, R. E. Potential changes in suspensions of chloroplasts on illumination. Arch. Biochem. 28: 48-67. 1950. 33. STERN, H. and MIRSKY, A. E. Soluble enzymes of nuclei isolated in sucrose and non-aqueous media. A comparative study. Jour. Gen. Physiol. 37: 177-188. 1953. 34. STRUGGER, S. tYber der Bau der Proplastiden und Chloroplasten. Naturwiss. 37: 166-167. 1950. 35. WEBSTER, G. C. The occurrence of a cytochrome oxidase in the tissues of higher plants. Amer. Jour. Bot. 39: 739-745. 1952. 36. WEIEP., T. E. and STOCKING, C. R. The chloroplast: structure, inheritance, and enzymology. II. Bot. Rev. 18: 14-75. 1952. 37. WEIER, T. E. and STOCKING, C. R. A cytological examination of leaf homogenates. I. Nuclear contamination and disorganized chloroplasts. Amer. Jour. Bot. 39: 720-726. 1952.