This journal provides immediate access to some articles. Volume 30(2); March 1955 Articles The Rise of Sap in Tall Grapevines. PMCID: PMC540610 The Relation of External Rubidium Concentration to Amounts and Rates of Uptake by Excised Potato Tuber Tissue. PMCID: PMC540611 Nitrogen Metabolism in Scenedesmus as Affected by Environmental Changes. PMCID: PMC540612 Effects of Micronutrient Deficiencies on Mineral Composition, Nitrogen Fractions, Ascorbic Acid and Burn of Tobacco Grown to Flowering in Water Culture. PMCID: PMC540613 Silicon Metabolism in Diatoms. II. Sources of Silicon for Growth of Navicula Pelliculosa. PMCID: PMC540614 Role of Molybdenum as a Constituent of Nitrate Reductase from Soybean Leaves. PMCID: PMC540615 Purification of Chloroplasts by a Density Technique. PMCID: PMC540616 Enzymatic Auxin Inactivation by Extracts of the Fern, Osmunda cinnamomea L. PMCID: PMC540617 A Comparison of Auxin Destruction by Tissue Extracts and Intact Tissues of the Fern, Osmunda cinnamomea L. PMCID: PMC540618 Effects of Oxygen and Carbon Dioxide Levels upon Absorption of Potassium by Plants. PMCID: PMC540619 Inhibition of Excised Tomato Roots by Sulfanilamide and Its Reversal by P-Aminobenzoic Acid and N-Pteroylglutamic Acid. PMCID: PMC540620 The Distribution of Rutin and Other Flavonoid Substances in Buckwheat Seedlings. PMCID: PMC540621 Ascorbic Acid Oxidase in Barley Roots PMCID: PMC540622 News and Notes PMCID: PMC540626 Brief Papers: Determination of Fe55 in Plant Material by the Thiocyanate Method. PMCID: PMC540623 Translocation from Soybean Leaves, II. PMCID: PMC540624 Oxidation and Decarboxylation of Amino Acids by Squash Preparations. PMCID: PMC540625 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||