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Volume 36(12);  December 1950
The cover of the journal
Astronomy
The Theory of Micro-Meteorites: Part I. In an Isothermal Atmosphere
Fred L. Whipple
Proc Natl Acad Sci U S A. 1950 December; 36(12): 687–695.
PMCID: PMC1063272
Biochemistry
Mercaptan-Induced Coagulation of Proteins
Charles Huggins, Donald Fraser Tapley, and Elwood V. Jensen
Proc Natl Acad Sci U S A. 1950 December; 36(12): 695–699.
PMCID: PMC1063273
The Action Spectrum of the Inhibition of Galactozymasb Production by Ultraviolet Light
Paul A. Swenson
Proc Natl Acad Sci U S A. 1950 December; 36(12): 699–703.
PMCID: PMC1063274
Genetics
The Structure of the Heterochromatic Part of the Y-Chromosome in Drosophila Buscki
J. D. Krivshenko
Proc Natl Acad Sci U S A. 1950 December; 36(12): 703–707.
PMCID: PMC1063275
Experiments with the Chemostat on Spontaneous Mutations of Bacteria
Aaron Novick and Leo Szilard
Proc Natl Acad Sci U S A. 1950 December; 36(12): 708–719.
PMCID: PMC1063276
The Analysis of a Case of Cross-Sterility in Maize
Drew Schwartz
Proc Natl Acad Sci U S A. 1950 December; 36(12): 719–724.
PMCID: PMC1063277
The Use of Sodium Nucleate in the Study of the Mutagenic Activity of Acriflavine in Escherichia Coli
Evelyn M. Witkin
Proc Natl Acad Sci U S A. 1950 December; 36(12): 724–731.
PMCID: PMC1063278
Geophysics
The Nature of Bone and Phosphate Rock
S. B. Hendricks and W. L. Hill
Proc Natl Acad Sci U S A. 1950 December; 36(12): 731–737.
PMCID: PMC1063279
Mathematics
Some Linear Operators in the Theory of Partial Differential Equations
S. Bergman and M. Schiffer
Proc Natl Acad Sci U S A. 1950 December; 36(12): 742–746.
PMCID: PMC1063281
Generalized Group Algebras
R. Creighton Buck
Proc Natl Acad Sci U S A. 1950 December; 36(12): 747–749.
PMCID: PMC1063282
Limit Cycles of Systems of the Second Order
G. F. D. Duff
Proc Natl Acad Sci U S A. 1950 December; 36(12): 749–752.
PMCID: PMC1063283
On the Addition and Multiplication Theorems for Special Functions
C. Truesdell
Proc Natl Acad Sci U S A. 1950 December; 36(12): 752–755.
PMCID: PMC1063284
Physics
Limitation of Electron Density by the Patterson Function
M. J. Buerger
Proc Natl Acad Sci U S A. 1950 December; 36(12): 738–742.
PMCID: PMC1063280
Journal Matter
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