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Volume 34(1);  January 1948
The cover of the journal
Biochemistry
Hydroxyanthranilic Acid as a Precursor of Nicotinic Acid in Neurospora
Herschel K. Mitchell and Joseph F. Nyc
Proc Natl Acad Sci U S A. 1948 January; 34(1): 1–5.
PMCID: PMC1062899
The Identification of a Natural Precursor of Nicotinic Acid
David Bonner
Proc Natl Acad Sci U S A. 1948 January; 34(1): 5–9.
PMCID: PMC1062900
Mathematics
On Line Congruences
W. van der Kulk
Proc Natl Acad Sci U S A. 1948 January; 34(1): 9–12.
PMCID: PMC1062901
A Simple Second Order Differential Equation with Singular Motions
N. Levinson
Proc Natl Acad Sci U S A. 1948 January; 34(1): 13–15.
PMCID: PMC1062902
The Number of Zeros of a Polynomial in a Circle
Morris Marden
Proc Natl Acad Sci U S A. 1948 January; 34(1): 15–17.
PMCID: PMC1062903
Infinite Dimensional Differential Metrics with Constant Curvature
Aristotle D. Michal
Proc Natl Acad Sci U S A. 1948 January; 34(1): 17–21.
PMCID: PMC1062904
Journal Matter
Original table of contents page
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