This journal provides immediate access to some articles. Volume 42(7); July 1956 Article NATIONAL ACADEMY OF SCIENCES: July 1, 1956 PMCID: PMC534248 Bacteriology NEUTRALIZATION OF BACTERIOPHAGE BY THE PROPERDIN SYSTEM PMCID: PMC534234 Genetics THE MECHANISM OF DNA REPLICATION AND GENETIC RECOMBINATION IN PHAGE PMCID: PMC534235 THE PHYTOENE CONTENT OF TOMATOES PMCID: PMC534236 Mathematics ON THE COBAR CONSTRUCTION PMCID: PMC534237 A CLASS OF STATIONARY PROCESSES AND A CENTRAL LIMIT THEOREM PMCID: PMC534238 MARKOFF PROCESSES AND POTENTIALS PMCID: PMC534239 ABSTRACT HOMOTOPY. III PMCID: PMC534240 L-SERIES OF A COVERING PMCID: PMC534241 A TOPOLOGICAL PROOF OF A THEOREM OF COMPLEX ANALYSIS PMCID: PMC534242 DISTRIBUTION FUNCTIONS OF ADDITIVE ARITHMETIC FUNCTIONS PMCID: PMC534243 THE REES-SUSCHKEWITSCH STRUCTURE THEOREM FOR COMPACT SIMPLE SEMIGROUPS PMCID: PMC534244 THE CHARACTERISTIC CLASSES OF AN ALGEBRAIC FIBER BUNDLE. I PMCID: PMC534245 Physics ON THE UNWINDING OF DNA PMCID: PMC534246 SOLUTION OF AN INTEGRAL EQUATION OCCURRING IN IMPULSIVE WAVE PROPAGATION PROBLEMS PMCID: PMC534247 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||