Materials Literature
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Abstract Additional polyvinylpyrrolidone samples of great homogeneity have been prepared, and their intrinsic viscosity and molecular weight (by light scattering) have been determined in water and chloroform. In view of the new results the previous data were reinterpreted particularly with respect to the shift in K (i…
Abstract Es wird die Phasenkontinuität und die Stabilisierung von Öl‐in‐Wasser‐ bzw. von Wasser‐in‐Öl‐Emulsionen durch Stoffe, die mehr in der öligen oder mehr in der wäßrigen Phase löslich sind, oder durch feste, unlösliche Stoffe, die entweder von der öligen oder von der wäßrigen Phase benetzt werden, besprochen. Un…
The Raman spectrum of furfural has been obtained photoelectrically in the liquid over a temperature range of 50° and in solution. The infrared spectrum has been obtained for the solid, the liquid (over a temperature range of 90°), and in dilute solution over a 50° temperature range. The vibrational spectrum is interpr…
1. The carbonic anhydrase inhibitors 2-benzothiazolesulfonamide (Cpd. I) and 2-acetylamino-1,3,4-thiadiazole-5-sulfonamide (Diamox) (Cpd. II) markedly reduced the rate of deposition of calcium in the shell of the oyster Crassostrea virginica. Treatment of oysters with Cpd. I, 1:80,000, for 7-8 hours reduced the rate t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Investigation of the Size, Shape and Hydration of Serum Albumin by Small-angle X-Ray Scattering1John W. Anderegg, W. W. Beeman, Sidney Shulman, and Paul KaesbergCite this: J. Am. Chem. Soc. 1955, 77, 11, 2927–2937Publication Date (Print):June 1, 1955Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrophosphate Formation Upon Ignition of Precipitated Basic Calcium Phosphates1Allen Gee and Victor R. DeitzCite this: J. Am. Chem. Soc. 1955, 77, 11, 2961–2965Publication Date (Print):June 1, 1955Publication History Published online1 May 2002Published inissue 1 June 1955htt…
Research Article| June 01 1955 Hypoglycin A and B, two biologically active polypeptides from Blighia sapida C. H. Hassall; C. H. Hassall 1Chemistry Department, University College of the West Indies, Mona, Jamaica, B.W.I. Search for other works by this author on: This Site PubMed Google Scholar K. Reyle K. Reyle 1Chemi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeptides Isolated from a Partial Hydrolysate of Steer Hide Collagen. II. Evidence for the Prolyl-Hydroxyproline Linkage in CollagenThomas D. Kroner, William Tabroff, and John J. McGarrCite this: J. Am. Chem. Soc. 1955, 77, 12, 3356–3359Publication Date (Print):June 1, 1955Pu…
Using single‐crystal electron diffraction data it has been possible to demonstrate more directly the existence of considerable order in dehydroxylated kaolinite and halloysite. The two‐dimensional ( a‐b ) plane structure of dehydroxylated kaolinite is very similar to that of kaolinite. This phase, appropriately descri…
X-ray, differential thermal analysis, and dehydration methods have been used to study the magnesium oxychlorides 3Mg(OH)2.MgCl2.8H2O and 5Mg(OH)2.MgCl2.8H2O formed at temperatures below 100 °C, and 2Mg(OH), . MgCl2.5H2O and 9Mg(OH)2.MgCl2.6H2O formed at temperatures at and above 100 'C. Lower hydrates of the 3-form ex…
The reactions which take place in the system MgO-MgCl2-H2O at concentrations of MgCl2 solutions up to 45 per cent. and temperatures from 0 to 110 °C have been studied in detail. Four oxychlorides have been found, namely, 9Mg(OH)2.MgCl2.5H2O, 5Mg(OH)2.MgCl2.8H2O, 3Mg(OH)2.MgCl2.8H2O, and 2Mg(OH)2.MgCl2.4H2O ; and an eq…
The theory of inner pair production associated with the radiative capture of ${\ensuremath{\pi}}^{\ensuremath{-}}$ mesons and with the decay of the ${\ensuremath{\pi}}^{0}$ meson is discussed. Appropriate distribution functions are derived and compared with recently obtained experimental results. The weak dependence o…
Abstract An investigation on polymer spherulites is being described in three parts. Part I (the present paper) describes the various effects observed under the polarizing microscope. These are interpreted in terms of the concepts of crystal optics; the problem of the position of the molecules and that of the microscop…
After a brief historical introduction, recent achievements in the theory of plasticity are surveyed with emphasis on applications in mechanical engineering. Kinematic models are presented that indicate the complexities of mechanical behaviour in the plastic range. The fundamental theorems of limit analysis are discuss…
Abstract The crystal structure of nylon 6 (NH (CH 2 ) 5 CO) p has been determined by interpretation of the x‐ray diffraction patterns given by drawn, rolled fibers. The determination was part of a program to investigate the relation between structure and physical properties, in particular melting point. Nylon 6 melt…
The optical rotation phenomena exhibited by a citrate-extracted fraction of ichthyocol (from carp swim bladder), as well as by the parent gelatin derived therefrom, have been studied. Dispersion data for all cases follow a single-term Drude equation, but the variations with state are adequately expressed by simple ref…
The Hall coefficient, magnetoresistance, and magnetic susceptibility of a graphite single crystal have been measured at liquid helium temperatures and in magnetic fields up to 25 kilogauss. All three phenomena are periodic functions of reciprocal field and exhibit the same period for like orientations of the crystal a…
The coefficients in the equation of state of BaTi${\mathrm{O}}_{3}$ proposed by Devonshire can be considered as describing the polarization and temperature dependence of the dielectric constant. This dependence has been studied by a dynamic method. The polarization is developed by a large-amplitude at field and the di…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
Single crystals of ${\mathrm{Cd}}_{2}$${\mathrm{Nb}}_{2}$${\mathrm{O}}_{7}$ have been grown, and dielectric, x-ray, and optical studies have been carried out on these above and below the ferroelectric Curie point. The x-ray analysis confirms the pyrochlore structure, and gives the oxygen parameter $x=0.305$ at room te…