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Volume 32(5);  May 1946
The cover of the journal
Bacteriology
Strain Specificity and Production of Antibiotic Substances: VII. Production of Actinomycin by Different Actinomycetes
Selman A. Waksman, Walton B. Geiger, and Donald M. Reynolds
Proc Natl Acad Sci U S A. 1946 May; 32(5): 117–120.
PMCID: PMC1078897
Growth Requirements of Virus-Resistant Mutants of Escherichia Coli Strain “B”
E. H. Anderson
Proc Natl Acad Sci U S A. 1946 May; 32(5): 120–128.
PMCID: PMC1078898
Genetics
Experiments on Sexual Isolation in Drosophila: VII. The Nature of the Isolating Mechanisms Between Drosophila Pseudoobscura and Drosophila Persimilis
Ernst Mayr
Proc Natl Acad Sci U S A. 1946 May; 32(5): 128–137.
PMCID: PMC1078899
Two Types of Heterochromatin in Drosophila Nebulosa
C. Pavan
Proc Natl Acad Sci U S A. 1946 May; 32(5): 137–145.
PMCID: PMC1078900
Genes Which Divide Species or Produce Hybrid Vigor
W. E. Castle
Proc Natl Acad Sci U S A. 1946 May; 32(5): 145–149.
PMCID: PMC1078901
Mathematics
Prime Number of Operators in Sets of Conjugates
G. A. Miller
Proc Natl Acad Sci U S A. 1946 May; 32(5): 149–152.
PMCID: PMC1078902
Comparison of Union-Preserving and Contact Transformations
Edward Kasner and John De Cicco
Proc Natl Acad Sci U S A. 1946 May; 32(5): 152–156.
PMCID: PMC1078903
An Ergodic Theorem
Paul R. Halmos
Proc Natl Acad Sci U S A. 1946 May; 32(5): 156–161.
PMCID: PMC1078904
Journal Matter
Original table of contents page
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