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This paper∗ deals with a new type of green alga originally found on the Cape Flats and since obtained in the United States of America and Australia. Initially identified as a second species of Volvulina Playfair, the considerations which led to the establishment of a distinct genus, Astrephomene, including the appeara…
The rate of oxidation of high purity zirconium was determined for the temperature range of 575° to 950°C at 1 atm pressure. Data can be fitted to a cubic law and the rate constant in (ml/cm 2 ) 3 /sec has been calculated to be , where 47,200 ± 1,000 cal/mole is the activation energy for the reaction.
The initial resistance to twisting, or torsional rigidity, of single fibres from thirty-four samples has been measured by the torsion pendulum method, with period of oscillation from 4 to 9 seconds and twist less than half a turn per cm. Using preliminary experiments on the influence of tension, damping and period of…
Abstract High molecular weight polymethacrylic acid in aqueous solution is rapidly broken down by ultrasonics (250 kc.). The rate of degradation varies as the shape of the molecule in solution is altered and is greatest when most asymmetric. It is concluded that cavitation is essential for the breakdown of the polymer…
The first page of this article is displayed as the abstract.
SHORT COMMUNICATIONSshows a peak electron density of 44.0 e.Zk -s, of which 9.6 e.A -s is due to the extrapolated portion of the f-curve, and a central curvature of 2350 e..~ -5, half of which arises from the extrapolation.Work is proceeding on the low-temperature refinement of the other two zones in the hope of obtai…
Kinetics of the reaction of zirconium with pure hydrogen and deuterium was studied for60°–250°C, H 2 pressures of 1.1–5.0 cm Hg, and composition range Zr ‐ ZrH 1.70 , using a vacuum microbalance method. The reaction was shown to be diffusion‐controlled with diffusion occurring from a surface of constant concentration…
1. A preparation of completely haemolysed erythrocytes from the blood ofdomestic fowls, which actively incorporates [Ox-14C]glycine into haem, is described.
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.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of Thiamine-catalyzed Reactions1Shunzi Mizuhara and Philip HandlerCite this: J. Am. Chem. Soc. 1954, 76, 2, 571–573Publication Date (Print):January 1, 1954Publication History Published online1 May 2002Published inissue 1 January 1954https://pubs.acs.org/doi/10.1021…
Abstract An investigation into the kinetics and the mechanism of thermal and oxidative decomposition of polyvinyl chloride is reported. The rate of HCl evolution was measured in streams of nitrogen, air, and oxygen. The reaction is described as a chain reaction involving initiation (thermal and oxidative), propagation…
R. M. Barrer and D. M. MacLeod, Trans. Faraday Soc., 1954, 50, 980 DOI: 10.1039/TF9545000980
A novel method is described for measuring the thickness of a barrier type anodic oxide coating or the barrier layer portion of a porous type anodic oxide coating. This method is used to follow the evolution of the barrier layer during the early stages of the formation of a porous type coating on aluminum and to establ…
R. J. Gillespie and J. A. Leisten, Q. Rev. Chem. Soc., 1954, 8, 40 DOI: 10.1039/QR9540800040
The effect of variations in electrolyte and forming conditions on the formation of porous type anodic oxide coatings on aluminum are discussed, with particular reference to the manner in which these variables control oxide formation, pore development, and the thickness of the barrier layer. Formation and solution rate…
The first page of this article is displayed as the abstract.
Part I of the paper analyses in detail the structure of diamond braid, and its geometry is developed, based on assumptions similar to those of Peirce9. The difficulties of determining braid length which result from its unique structure are considered. In Part II, a practical method of testing tubular braids to find th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA New Form of Uranium Hydride1R. N. R. Mulford, F. H. Ellinger, and W. H. ZachariasenCite this: J. Am. Chem. Soc. 1954, 76, 1, 297–298Publication Date (Print):January 1, 1954Publication History Published online1 May 2002Published inissue 1 January 1954https://pubs.acs.org/do…
The Hall effect and conductivity of zinc oxide have been measured in dense polycrystalline samples and two single crystals.It has been found that the usual simple Wilson semiconductor model is inadequate for the proper interpretation of results. Several modifications and additions have been suggested for the usual sin…
The structure of titanium monoboride has been determined by single-crystal and powder methods to be of the FeB-type. The dimensions of the orthorhombic unit cell are ao = 6.12, b0 ----3.06 and co -~ 4.56/~. As in other borides of composition MB, the boron atoms form zigzag chains through the lattice. Short interatomic…