Proceedings of the National Academy of Sciences of the United States of America, Volume 3National Academy of Sciences, 1917 - 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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Common terms and phrases
Academy acid Amer amount angle animals appear atoms augite average axis cadmium cells Chairman chromosomes clusters coal balls color Committee conidia constant corresponding crystals curve deposit determined differentiation distance E. H. Moore E. W. Morley effect electrons embryo endothelium equation error evidence experiments factors feldspar females figure fringes function galactic geodesic curvature indicate investigation LABORATORY larvae length leucite limestone lines magnitude males means measured melanophores Messier Messier 13 method Millikan molecules Mount Wilson nasal National Research Council normal observed obtained organization orthoclase phosphorescence photographic plane plates position present pressure probably produced proper motion radial velocities reaction Read April reefs regeneration region relation reported rocks sea water shonkinites shown solution species stars substance surface temperature theory tion University velocities Washington
Popular passages
Page 9 - Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
Page 730 - 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 576 - ... by Dr. LA Bauer, Director of the Department of Terrestrial Magnetism of the Carnegie Institution of Washington. He also stated that this work had the approval of the President of the Carnegie Institution of Washington.
Page 205 - Spaeth 1,1916)* that these pigment cells are functionally modified smooth muscle cells. The fact that this mechanism is brought into action during nervous excitement indicates that the physiological basis of emotional manifestations is similar in reptiles and mammals. 1 Contributions from the Zoological Laboratory of the Museum of Comparative Zoology at Harvard College. No. 293.
Page 678 - In such tests entire freedom from mechanical vibrations is an absolute essential and care must be exercised in handling the treated specimens to avoid a strong mechanical stimulus. From these observations I conclude that the locomotion of planarians is essentially a muscular act in which the cilia play no necessary part. 1 Contributions from the Zoological Laboratory of the Museum of Comparative Zoology at Harvard College. No. 301. DIURNAL CHANGES IN THE SEA AT TORTUGAS, FLORIDA By JF McClendon DEPARTMENT...
Page 710 - Zoology the attempt has been made to select its members so as to represent various branches of Zoological research as well as different sections of the country and at the same time not to have the Committee so large or so widely scattered as to be unworkable. The Zoological Committee of the Committee of One Hundred on Scientific Research...
Page 226 - Noyes that the Committee of One Hundred on Scientific Research of the American Association for the Advancement of Science...
Page 102 - ... (protaxonia), or, as in all other metazoa (heteraxonia), this axis is bent on itself by the greater growth of the gastrula on its posterior side so that the chief axis of the adult is a modification of the gastrular axis. In either case the polarity of the unfertilized egg determines the localization of developmental processes and ultimately the polarity of the developed animal. (2) Symmetry. In most animals the egg is spherical in shape and appears to be radially symmetrical, nevertheless observation...
Page 136 - Huss, rediscussing this material6 derived a parallax of — 0*.063 =±= O'.OSO. It should be remarked that on most plates Wilsing measured, not the nucleus, but the whole nebula, which has a diameter of about 26". Professor Barnard has stated,6 that the central star of the nebula is variable "to an extent upwards of three magnitudes; at times it has appeared as a bright yellowish star of about the 12th magnitude." The star appears to have practically the same magnitude on all my plates, varying from...
Page 701 - ... quotient at 0.95, but whether it was constant could not be determined. From the heat produced and nitrogen lost it was concluded that proteins with a small admixture of carbohydrates and fats were burned. Since the temperature was constant, the oxygen-tension was proportional to the...