This journal provides immediate access to some articles. Volume 42(6); June 1956 Biochemistry THE ENZYMATIC ACTIVATION OF AMINO ACIDS VIA THEIR ACYL-ADENYLATE DERIVATIVES PMCID: PMC528283 ENZYMATIC SYNTHESIS OF URIDINE DIPHOSPHATE XYLOSE AND URIDINE DIPHOSPHATE ARABINOSE PMCID: PMC528284 Chemistry RADIOACTIVE STRONTIUM FALLOUT PMCID: PMC528294 Genetics RULES FOR TESTING STABILITY OF A SELECTIVE POLYMORPHISM PMCID: PMC528285 SUPPRESSION OF BUNT-RESISTANT GENE ACTION BY ENVIRONMENTAL CONDITIONS PMCID: PMC528286 Mathematics OPEN MAPPINGS OF COMPACT CONTINUA PMCID: PMC528287 CONCERNING THE ACTION OF A FINITE GROUP PMCID: PMC528288 A DIFFUSION EQUIVALENT TO A COUNTABLE MARKOV CHAIN PMCID: PMC528289 ON DIFFERENTIAL GEOMETRY AND HOMOGENEOUS SPACES. II PMCID: PMC528290 THE DEGREE OF AN IRREDUCIBLE REPRESENTATION OF Sn PMCID: PMC528291 ON A GENERALIZATION OF THE NOTION OF MANIFOLD PMCID: PMC528292 N. A. S. Lecture SCIENCE AND BROAD POINTS OF VIEW PMCID: PMC528282 Physics THE KINETIC ENERGY OF RELATIVE MOTION PMCID: PMC528293 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||