Proceedings of the National Academy of Sciences of the United States of America
National Academy of Sciences, 1918 - 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.
What people are saying - Write a review
We haven't found any reviews in the usual places.
Other editions - View all
Academy of Sciences amount appointed artery atomic weight augite average barrier reefs basal basalt calories Cepheid variables Chairman chemical chitons chromosome clusters coefficients constant crystal curve determined diet difference dilation distance Division E. H. Moore E. W. Morley effect electric equation experimental experiments extra bristles female field free electrons fringing reefs function galactic gram heat hypothesis increase indicated investigation ions islands Laboratory lead magnetic male measurements melanophores metal method mobilities motion myodome National Academy National Research Council negative normal observed obtained olivine organization parthenogenetic period photosynthesis plane plate positive potential present pressure produced radial velocity radiation relation relative Research Information Committee rocks rotation slit solar solifluction specimens spectral spectral type spectrum spine number squad stars submergence surface temperature theorem theory tion University uraninite uranium variables variation Washington
Page 251 - To promote cooperation in research, at home and abroad, in order to secure concentration of effort, minimize duplication, and stimulate progress; but in all cooperative undertakings to give encouragement to individual initiative, as fundamentally important to the advancement of science. - 4. To serve as a means of bringing American and foreign investigators into active cooperation with the scientific and technical services of the War and Navy Departments and with those of the civil branches of the...
Page 125 - Attache's in order that all duplication of work or crossing of effort may be avoided, with the consequent waste of time and energy and the confusion resulting from crossed or duplicated effort; (d) To serve as an immediate auxiliary to the offices of the Military and Naval Attaches in the collection, analysis, and compilation of scientific, technical, and industrial research information. (e) To serve as an agency at the immediate service of the...
Page 251 - Sciences is therefore requested to perpetuate the National Research Council, the duties of which shall be as follows: 1. In general, to stimulate research in the mathematical, physical and biological sciences, and in the application of these sciences to engineering, agriculture, medicine and other useful arts, with the object of increasing knowledge, of strengthening the national defense, and of contributing in other ways to the public welfare.
Page 413 - ... be prosecuted actively and that frequent reports of progress will be submitted to the Division. The list of subjects cover a wide range, from questions connected with chemical warfare to questions of conservation of materials a shortage of which is imminent. Division of Geology and Geography. — In the absence of Messrs. Merriam and Cross, Mr. Gregory has acted as Chairman of the Division and" also of the Section on Relations with Educational Institutions and State Committees. The chief work...
Page 288 - The general conclusion reached is that within a large family of Arcella dentata produced by vegetative reproduction from a single specimen, there are many heritably diverse branches. These diversities are due both to very slight variations and to sudden large variations ('mutations'). The formation of such hereditarily diverse branches appears to be a true case of evolution that has been observed in the laboratory and that occurs in a similar way in nature.
Page 251 - To serve as a means of bringing American and foreign investigators into active co-operation with the scientific and technical services of the War and Navy Departments and with those of the civil branches of the Government. 5. To direct the attention of scientific and technical investigators to the present importance of military and industrial problems in connection with the war, and to aid in the solution of these problems by organizing specific researches.
Page 125 - To serve as centers of distribution to our Allies in Europe of scientific, technical, and industrial research information originating in the United States and transmitted through the Research Information Committee in Washington.
Page 251 - Council shall be as follows: (a) In general, to stimulate research In the mathematical, physical, and biological sciences, and In the application of these sciences to engineering, agriculture, medicine, and other useful arts, with the object of Increasing knowledge, of strengthening the national defense, and of contributing in other ways to the public welfare.
Page 176 - The following is a partial report on results obtained in continuation of work under a grant from the J. Lawrence Smith Fund of the National Academy of Sciences.
Page 387 - ... outcome of this work, then, by finding no appreciable difference in the molal solubility of the different samples of lead nitrate containing isotopes of widely different atomic weights, confirms earlier work upon other properties of these interesting substances. Evidently weight (or mass) is the 'prime distinguishing feature of the two kinds of lead here studied, as it was in other cases. This work and that described in the preceding section thus afford further support for the hypothesis due...