Skip to main content
  • Submit
  • About
    • Editorial Board
    • PNAS Staff
    • FAQ
    • Accessibility Statement
    • Rights and Permissions
    • Site Map
  • Contact
  • Journal Club
  • Subscribe
    • Subscription Rates
    • Subscriptions FAQ
    • Open Access
    • Recommend PNAS to Your Librarian
  • Log in
  • My Cart

Main menu

  • Home
  • Articles
    • Current
    • Special Feature Articles - Most Recent
    • Special Features
    • Colloquia
    • Collected Articles
    • PNAS Classics
    • List of Issues
  • Front Matter
  • News
    • For the Press
    • This Week In PNAS
    • PNAS in the News
  • Podcasts
  • Authors
    • Information for Authors
    • Editorial and Journal Policies
    • Submission Procedures
    • Fees and Licenses
  • Submit
  • About
    • Editorial Board
    • PNAS Staff
    • FAQ
    • Accessibility Statement
    • Rights and Permissions
    • Site Map
  • Contact
  • Journal Club
  • Subscribe
    • Subscription Rates
    • Subscriptions FAQ
    • Open Access
    • Recommend PNAS to Your Librarian

User menu

  • Log in
  • My Cart

Search

  • Advanced search
Home
Home

Advanced Search

  • Home
  • Articles
    • Current
    • Special Feature Articles - Most Recent
    • Special Features
    • Colloquia
    • Collected Articles
    • PNAS Classics
    • List of Issues
  • Front Matter
  • News
    • For the Press
    • This Week In PNAS
    • PNAS in the News
  • Podcasts
  • Authors
    • Information for Authors
    • Editorial and Journal Policies
    • Submission Procedures
    • Fees and Licenses

New Research In

Physical Sciences

Featured Portals

  • Physics
  • Chemistry
  • Sustainability Science

Articles by Topic

  • Applied Mathematics
  • Applied Physical Sciences
  • Astronomy
  • Computer Sciences
  • Earth, Atmospheric, and Planetary Sciences
  • Engineering
  • Environmental Sciences
  • Mathematics
  • Statistics

Social Sciences

Featured Portals

  • Anthropology
  • Sustainability Science

Articles by Topic

  • Economic Sciences
  • Environmental Sciences
  • Political Sciences
  • Psychological and Cognitive Sciences
  • Social Sciences

Biological Sciences

Featured Portals

  • Sustainability Science

Articles by Topic

  • Agricultural Sciences
  • Anthropology
  • Applied Biological Sciences
  • Biochemistry
  • Biophysics and Computational Biology
  • Cell Biology
  • Developmental Biology
  • Ecology
  • Environmental Sciences
  • Evolution
  • Genetics
  • Immunology and Inflammation
  • Medical Sciences
  • Microbiology
  • Neuroscience
  • Pharmacology
  • Physiology
  • Plant Biology
  • Population Biology
  • Psychological and Cognitive Sciences
  • Sustainability Science
  • Systems Biology

Table of Contents

February 01, 1928; vol. 14 no. 2

Chemistry

  • You have access
    The Quantum Theory of Quasi-Unimolecular Gas Reactions
    Oscar Knefler Rice
    PNAS February 1, 1928 14 (2) 113-118; https://doi.org/10.1073/pnas.14.2.113
  • You have access
    The Theory of the Decomposition of Azomethane
    Oscar Knefler Rice
    PNAS February 1, 1928 14 (2) 118-124; https://doi.org/10.1073/pnas.14.2.118
  • You have access
    Fundamental Frequencies, Interatomic Forces and Molecular Properties
    John R. Bates and Donald H. Andrews
    PNAS February 1, 1928 14 (2) 124-130; https://doi.org/10.1073/pnas.14.2.124
  • You have access
    The Effect of Intensive Drying on the Vapor Pressure and Vapor Density of Ammonium Chloride
    Worth H. Rodebush and John C. Michalek
    PNAS February 1, 1928 14 (2) 131-132; https://doi.org/10.1073/pnas.14.2.131

Zoölogy

  • You have access
    Some Effects of Dietary Insufficiency in the Ciliate Didinium Nasutum
    C. Dale Beers
    PNAS February 1, 1928 14 (2) 132-137; https://doi.org/10.1073/pnas.14.2.132

Statistics

  • You have access
    Mendelian Inheritance with Assortive Mating
    Edwin B. Wilson
    PNAS February 1, 1928 14 (2) 137-140; https://doi.org/10.1073/pnas.14.2.137

Genetics

  • You have access
    Genetic Evidence of a Selective Segregation of Chromosomes in a Second Species of Sciara (Diptera)
    Chas. W. Metz
    PNAS February 1, 1928 14 (2) 140-141; https://doi.org/10.1073/pnas.14.2.140
  • You have access
    The “Outside-In” Oenothera Flower, a New Morphological Type Produced by the Interaction of Two Recessive Mendelian Factors
    George H. Shull
    PNAS February 1, 1928 14 (2) 142-146; https://doi.org/10.1073/pnas.14.2.142
  • You have access
    Linkage with Crossing-Over between Rubricalyx Buds and Old-Gold Flower Color in Oenothera
    George H. Shull
    PNAS February 1, 1928 14 (2) 147-149; https://doi.org/10.1073/pnas.14.2.147

Mathematics

  • You have access
    A New Proof of the Lefschetz Formula on Invariant Points
    H. Hopf
    PNAS February 1, 1928 14 (2) 149-153; https://doi.org/10.1073/pnas.14.2.149
  • You have access
    Note on Projective Coördinates
    H. P. Robertson
    PNAS February 1, 1928 14 (2) 153-154; https://doi.org/10.1073/pnas.14.2.153
  • You have access
    Projective Tensors and Connections
    Oswald Veblen
    PNAS February 1, 1928 14 (2) 154-166; https://doi.org/10.1073/pnas.14.2.154

Physics

  • You have access
    The Molecular Structures of Methane
    Jared Kirtland Morse
    PNAS February 1, 1928 14 (2) 166-171; https://doi.org/10.1073/pnas.14.2.166
  • You have access
    Additional Lines in the K Series of Molybdenum and the Natural Breadth of Spectral Lines
    Bergen Davis and Harris Purks
    PNAS February 1, 1928 14 (2) 172-178; https://doi.org/10.1073/pnas.14.2.172
  • You have access
    The Correspondence Principle in the Statistical Interpretation of Quantum Mechanics
    J. H. Van Vleck
    PNAS February 1, 1928 14 (2) 178-188; https://doi.org/10.1073/pnas.14.2.178
  • You have access
    Experiments with Modified Mucronate Electrodes
    Carl Barus
    PNAS February 1, 1928 14 (2) 188-191; https://doi.org/10.1073/pnas.14.2.188
  • You have access
    The Mobilities of Gaseous Ions in H2S-H2 Mixtures
    Leonard B. Loeb and L. DuSault
    PNAS February 1, 1928 14 (2) 192-199; https://doi.org/10.1073/pnas.14.2.192
PreviousNext
Back to top

Browse PNAS issues

In this issue

  • Table of Contents
Sign up for alerts

Jump to

  • Chemistry
  • Zoölogy
  • Statistics
  • Genetics
  • Mathematics
  • Physics

PNAS Highlights. Top research, news, and commentary delivered straight to your inbox.

Site Logo
Powered by HighWire
  • Submit Manuscript
  • Twitter
  • Facebook
  • RSS Feeds
  • Email Alerts

Articles

  • Current Issue
  • Special Feature Articles – Most Recent
  • List of Issues

PNAS Portals

  • Anthropology
  • Chemistry
  • Classics
  • Front Matter
  • Physics
  • Sustainability Science
  • Teaching Resources

Information

  • Authors
  • Editorial Board
  • Reviewers
  • Librarians
  • Press
  • Site Map
  • PNAS Updates

Feedback    Privacy/Legal

Copyright © 2021 National Academy of Sciences. Online ISSN 1091-6490