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Volume 26(6);  June 15, 1940
Astronomy
On Possible Changes in the Solar “Constant”
Theodore Eugene Sterne, Karl Frederick Guthe, and Walter Orr Roberts
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 399–406.
PMCID: PMC1078195
On Solar Faculae and Solar Constant Variations
Henryk Arctowski
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 406–411.
PMCID: PMC1078196
Botany
Mutations and Reversions in Reproductivity of Aspergilli with Nitrite, Colchicine and d-Lysine
Robert A. Steinberg and Charles Thom
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 363–366.
PMCID: PMC1078190
Chemistry
The Course of Thiamin Metabolism in Man as Indicated by the Use of Radioactive Sulfur
Henry Borsook, Edwin R. Buchman, John B. Hatcher, Don M. Yost, and Edwin McMillan
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 412–418.
PMCID: PMC1078197
Radioactive Carbon in the Study of Respiration in Heterotrophic Systems
S. Ruben and M. D. Kamen
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 418–422.
PMCID: PMC1078198
CO2 Assimilation by Proprionic Acid Bacteria Studied by the Use of Radioactive Carbon
S. F. Carson and S. Ruben
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 422–426.
PMCID: PMC1078199
The Reduction of Radioactive Carbon Dioxide by Methane-Producing Bacteria
H. A. Barker, S. Ruben, and M. D. Kamen
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 426–430.
PMCID: PMC1078200
Genetics
A Comparison of Chromosomal Aberrations Induced by X-Ray and Ultra-Violet Radiation
Carl P. Swanson
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 366–373.
PMCID: PMC1078191
Cytology and Development of the Embryos of X-Rayed Adult Drosophila Melanogaster
B. P. Sonnenblick
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 373–381.
PMCID: PMC1078192
Mathematics
A Pathological Case in the Numerical Solution of Integral Equations
C. L. Pekeris
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 433–437.
PMCID: PMC1078202
The Conformal Theory of Curves
Aaron Fialkow
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 437–439.
PMCID: PMC1078203
Physics
The Coronaviser, an Instrument for Observing the Solar Corona in Full Sunlight
A. M. Skellett
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 430–433.
PMCID: PMC1078201
Physiology and Biochemistry
On the Law for Minimal Discrimination of Intensities: IV. ΔI as a Function of Intensity
W. J. Crozier
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 382–389.
PMCID: PMC1078193
Differences between Men and Women in Their Response to Heat and Cold
James D. Hardy and Eugene F. Du Bois
Proc Natl Acad Sci U S A. 1940 June 15; 26(6): 389–398.
PMCID: PMC1078194
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