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Table of Contents

February 15, 1957; vol. 43 no. 2

Biochemistry

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THE METABOLISM OF L-THREONINE AND GLYCINE BY Escherichia coli
Dorothy A. Miller and Sofia Simmonds

PNAS February 15, 1957 43 (2) 195-199; https://doi.org/10.1073/pnas.43.2.195

Botany

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STERILE INDUCTION OF CROWN-GALL TUMORS ON CARROT TISSUES IN VITRO
Richard M. Klein and John L. Knupp Jr.

PNAS February 15, 1957 43 (2) 199-203; https://doi.org/10.1073/pnas.43.2.199

Chemistry

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THE STRUCTURE OF ALPHA KERATIN
Maurice L. Huggins

PNAS February 15, 1957 43 (2) 204-209; https://doi.org/10.1073/pnas.43.2.204
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THE STRUCTURE OF COLLAGEN
Maurice L. Huggins

PNAS February 15, 1957 43 (2) 209-213; https://doi.org/10.1073/pnas.43.2.209
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THE CONTRIBUTION OF THE α-HELICAL CONFIGURATION TO THE OPTICAL ROTATION OF POLYPEPTIDES AND PROTEINS
Paul Doty and R. D. Lundberg

PNAS February 15, 1957 43 (2) 213-222; https://doi.org/10.1073/pnas.43.2.213

Genetics

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CONTRIBUTIONS TO THE THEORY OF THE CONTINUOUS BACTERIAL GROWTH APPARATUS
H. Moser

PNAS February 15, 1957 43 (2) 222-226; https://doi.org/10.1073/pnas.43.2.222
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HETEROSIS AND ELIMINATION OF WEAK HOMOZYGOTES IN NATURAL POPULATIONS OF THREE RELATED SPECIES OF Drosophila
Crodowaldo Pavan, Theodosius Dobzhansky, and Antonio Brito da Cunha

PNAS February 15, 1957 43 (2) 226-234; https://doi.org/10.1073/pnas.43.2.226

Mathematics

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REGULARITY THEOREMS FOR SOLUTIONS OF PARTIAL DIFFERENTIAL EQUATIONS WITH VARIABLE COEFFICIENTS
Felix E. Browder

PNAS February 15, 1957 43 (2) 234-236; https://doi.org/10.1073/pnas.43.2.234
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TWO RECURSIVELY ENUMERABLE SETS OF INCOMPARABLE DEGREES OF UNSOLVABILITY (SOLUTION OF POST'S PROBLEM, 1944)
Richard M. Friedberg

PNAS February 15, 1957 43 (2) 236-238; https://doi.org/10.1073/pnas.43.2.236
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A THEOREM ON STABILITY OF COMPLEX STRUCTURES
Alfred Frölicher and Albert Nijenhuis

PNAS February 15, 1957 43 (2) 239-241; https://doi.org/10.1073/pnas.43.2.239
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ON THE SPECTRAL SEQUENCE OF A FIBER SPACE. II
Witold Hurewicz and Edward Fadell

PNAS February 15, 1957 43 (2) 241-245; https://doi.org/10.1073/pnas.43.2.241
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INTEGRATION OF A DIFFERENTIAL FORM ON AN ANALYTIC COMPLEX SUBVARIETY
Pierre LeLong

PNAS February 15, 1957 43 (2) 246-248; https://doi.org/10.1073/pnas.43.2.246
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APPLICATION OF HILBERT SPACE METHODS TO LIE GROUPS ACTING ON A DIFFERENTIABLE MANIFOLD
Jacqueline LeLong-Ferrand

PNAS February 15, 1957 43 (2) 249-252; https://doi.org/10.1073/pnas.43.2.249

Correction

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DIAPHANTINE EQUATIONS IN CERTAIN RINGS
PNAS February 15, 1957 43 (2) 252-253; https://doi.org/10.1073/pnas.43.2.252

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