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 angle animals appear atoms average axis axostyle cadmium Cassiopea cells Chairman Chem chromosomes clusters 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 female figure fringes function galactic geodesic curvature globular clusters indicate investigation LABORATORY larvae leucite limestone lines magnitude male mass means measured melanophores Messier Messier 13 method Millikan molecules Mount Wilson National Research Council normal observed obtained organization orthoclase photographic plane plates positive present pressure probably produced proper motion radial velocities reaction Read April reef region relation sea water shown solution species stars substance surface temperature theory tion transformation University variation velocities Washington wave-lengths weight
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 584 - ... 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 692 - ... 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 OF PHYSIOLOGY. UNIVERSITY OF MINNESOTA AND TORTUGAS LABORATORY. CARNEGIE INSTITUTION OF WASHINGTON...
Page 228 - Noyes that the Committee of One Hundred on Scientific Research of the American Association for the Advancement of Science...
Page 452 - For the lines of highest weight the displacement at the limb is zero, the mean for all lines +0.0018 A. Owing to the probable occurrence of blends in this region, the displacement to the red for the broader lines of group B may be in part at least attributed to this influence, as the effect of blends with metallic lines is to introduce systematic displacement to the red even for lines normally undisplaced at the limb. The general conclusion from the investigation is that within the limits of error...
Page 104 - ... at the time of fertilization the hereditary potencies of the two germ cells are not equal, all the early stages of development, including the polarity, symmetry, type of cleavage, and the pattern, or relative positions and proportions of future organs, being foreshadowed in the cytoplasm of the egg cell, while only the differentiations of later development are influenced by the sperm. In short the egg cytoplasm fixes the .general type of development and the sperm and egg nuclei supply only the...
Page 105 - Whenever a character is transmitted as such through the egg cytoplasm and not as factors in the chromosomes of egg and sperm it is not inherited in Mendelian fashion. Thus if chromatophores are transmitted from generation to generation in the cytoplasm of the egg and are at no time influenced by the sperm, their mode of inheritance is non-Mendelian. If the polarity, symmetry and pattern of the egg do not arise during oogenesis, but are carried over unchanged from generation to generation they are...
Page 272 - ... potential. In fact the sudden augmentation of the negative charge upon any one of the colloidal particles would attract other positive cations from the surfaces of neighboring particles and initiate a local negative potential which would travel through the nerve. It is more probable however that, as the velocity of nerve conduction is proportional to the degree of concentration of the adsorbed sodium, calcium, and potassium cations, these cations themselves initiate the reaction and form some...
Page 391 - The President of the National Academy of Sciences. Sir: I have the honor to present the following report on the publications and memberships of the National Academy of Sciences for the year ending April 19, 1916.
Page 744 - 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.