Proceedings of the National Academy of Sciences of the United States of America
National Academy of Sciences, 1921 - Electronic journals
The Proceedings of the National Academy of Sciences (PNAS) publishes research reports, commentaries, reviews, colloquium papers, and actions of the Academy. PNAS is a multidisciplinary journal that covers the biological, physical, and social sciences.
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acid Amer atomic number average bundles C. B. Davenport calculated character Chem chemical elements chromosome coefficient of variation column computed conjugate constant corresponding crossing cubic curves Data Calc derivatives determined deviation diameter differential Diminished distance E. H. Moore ebullioscopy effect electrons elements energy equation error experiments factor figure flour fringes function genetic given Globe heat hypocotyl increase infection integral interferometer investigation ionization linear loci mean measured melanogaster mercury metal method molecules mutant National Academy National Research Council non-disjunction normal observed obtained Ohm's law orbits pair phosphorescence pink plane plate postage 1 cent potential prediction pressure Proboscidea pure line quadric Quercina ratio Read April region represent seedlings sextic shown solution Stieltjes integral substitutions T. H. Morgan temperature theorem tion transformation triploid trypanosomes tube values variable velocity volume wave-length zero
Page 137 - Papers from the Department of Biometry and Vital Statistics, School of Hygiene and Public Health, Johns Hopkins University, No.
Page 362 - Washington, DC The Bulletin of the National Research Council presents contributions from the National Research Council, other than proceedings, for which hitherto no appropriate agencies of publication have existed. The "Bulletin" is published at irregular intervals.
Page 141 - It dropped very rapidly for the first seven days and then much slower for the next twelve days. By the 19th day it reached the low value of 3.11 ± .14% and it showed no significant change from this value throughout the remainder of the infection. It is well to compare the conditions found in rat 116 with those in rat 105. Rat 116 is given here because a longer time elapsed before the infection reached the adult stage than was the case in any of the other infections studied. This is due probably...
Page 362 - Number 2. Research laboratories in industrial establishments of the United States of America. Compiled by Alfred D. Flinn. March, 1920. Pages 85. Price $1.00. [Out of print. See Number 16.] Number 3. Periodical bibliographies and abstracts for the scientific and technological journals of the world.
Page 339 - On a method of precisely measuring the vibratory periods of tuning-forks, and the determination of the laws of the vibrations of forks; with special reference to these facts and laws to the action of a simple chronoscope.
Page 363 - Number 1. Report of the Patent Committee of the National Research Council. Presented for the Committee by LH Baekeland, Acting Chairman. February, 1919. Pages 24. Price $0.30.
Page 163 - DEPARTMENT OF MEDICAL ZOOLOGY OF THE SCHOOL OF HYGIENE AND PUBLIC HEALTH, JOHNS HOPKINS UNIVERSITY Communicated by R. Pearl, MAY 2, 1921 The flagellate, Trypanosoma lewisi, is a non-pathogenic blood parasite occurring in various species of rats all over the world. It is known to be transmitted from rat to rat by the rat flea. This trypanosome was selected for the present work because it occurs in the latitude of Baltimore and the vertebrate...
Page 340 - Pp. 93-95. 8. On the structure of the brain of the sessile-eyed Crustacea. I. The Brain of Asellus and the eyeless form Cecidotaea.