CHEMICAL WEATHERING OF BIOTITE BY ORGANIC ACIDS
University of Michigan, Ann Arbor, Yale University, and The Conneclicut Agricultural Experiment Station, New Haven
Materials Literature
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Ultra-violet and X-ray photoelectron spectroscopy (UPS and XPS) of CO, CO2, O2 and H2O on molybdenum and gold films
Electron spectroscopic (XPS and UPS) studies of the interaction of CO, CO2, O2 and H2O with Mo, and H2O and CO2 with Au are reported. The object was first to explore how far one could distinguish and between different states of chemisorption; whether there was any relation between bond strength and electron binding en…
The Staining Pattern of Collagen Fibrils: Ii. a Comparison With Patterns Computer-Generated From the Amino Acid Sequence
The known amino acid sequence of the α1 chain of collagen enables the distribution of electric charges along the molecule to be predicted (with the assumptions that the residues, including those in the telopeptides, are uniformly spaced and that the charge distribution in the α2 chain is similar to that in the α1). By…
Variations in the Crystalline Components of Human Dental Calculus: I. Crystallographic and Spectroscopic Methods of Analysis
The diffractometric method has more advantages than the camera technique for X-ray diffraction analysis of the crystalline components of human dental calculus. With the use of this crystallographic method and infrared absorption techniques, it was found that the magnesium content of human dental calculus is the result…
Studies of Some Heterocyclic Mesogens
New mesogens have been prepared and studied by differential thermal analysis and optical microscopy to elucidate the effects on mesomorphic properties of replacing a benzene ring by differnt hiterocyclic rings. Earlier workers have assessed the effects on nematic properties arising from such changes in the terminal gr…
Hot‐Pressing Behavior of Si 3 N 4
The densification behavior of Si 3 N 4 containing MgO was studied in detail. It was concluded that MgO forms a liquid phase (most likely a magnesium silicate). This liquid wets and allows atomic transfer of Si 3 N 4 . Evidence of a second‐phase material between the Si 3 N 4 grains was obtained through etching studies.…
The Synthesis and Photoluminescence of M[sup II]M[sub 2][sup III](S,Se)[sub 4]
The compositions M II M 2 III ( S , Se ) 4 where M II = Eu , , Ca , Sr , Ba and M III = Al , Ga , In were prepared by reaction of the elements in evacuated silica tubes with iodine as a mineralizer. All members except Ba ( Ga , Al ) 2 S 4 , which is cubic, exhibit the pseudo‐orthorhombic PbGa 2 Se 4 type structure. Th…
The Kinetics of Hydrogen Absorption in Palladium (α‐ and β‐phase) and Palladium‐Silver‐Alloys
Abstract The reaction H 2 → 2 H (dissolved) on thin Pd and Pd‐Ag foils (2.5–5 μm) was studied, with the aid of resistance measurements, in a flow apparatus at temperatures in the range 20–150°C. The rate determining step is the dissociation of the H 2 ‐molecule on the metal surface. It is assumed that in the formation…
Mapping of the Structural Genes of the Three Aspartokinases and of the Two Homoserine Dehydrogenases of Escherichia coli K-12
Mutants requiring threonine plus methionine (or homoserine), or threonine plus methionine plus diaminopimelate (or homoserine plus diaminopimelate) have been isolated from strains possessing only one of the three isofunctional aspartokinases. They have been classified in several groups according to their enzymatic def…
A Survey of a Group of Phosphors, Based on Hexagonal Aluminate and Gallate Host Lattices
A group of photoluminescent materials, which may have great influence on future fluorescent lamp development, is surveyed. The materials are based on hexagonal aluminates and gallates which are structurally related to the magnetoplumbites and (β‐alumina. When activated with Mn 2+ , Eu 2+ , Tl 2+ , Ce 3+ , and Tb 3+ ,…
Thermal Decomposition of Polyvinyl Chloride) and of Its Low-Molecular-Weight Model Compounds
Polyvinyl chloride) (PVC) is undoubtedly among the most frequently used plastics; it is widely applied in many branches of the national economy, including industry and building [1]. Its advantages are comparatively high chemical resistance, low production costs, and an almost universal possibility of application as pa…
Zirconium in Nuclear Applications
Description The Symposium on Zirconium in Nuclear Applications was held 21–24 August 1973 in Portland, Ore., and was co-sponsored by the American Society for Testing and Materials (ASTM) Committee B-10 on Refractory Metals and Alloys and by the Institute of Metals Division, The Metallurgical Society of the American In…
Preparation and General Properties of Crystalline Penicillin Acylase from Escherichia coli ATCC 11 105
Article Preparation and General Properties of Crystalline Penicillin Acylase from Escherichia coli ATCC 11 105 was published on January 1, 1974 in the journal Biological Chemistry (volume 355, issue 1).
Surface and Defect Properties of Solids
Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular ar…
Equilibria in the Fe2(SO4)3/Fe2O3/SO3 system
The pressures of SO3 which exist in equilibrium with ferric sulphate have been measured in the temperature range 740 to 975 K by static and dynamic techniques. The overall equilibrium may be described by the two equations Fe2(SO4)3⇌Fe2O3+ 3SO3, 2SO3⇌2SO2+ O2 The equilibrium SO3 pressures above partially sulphated samp…
Optical properties of the Magnetotropic Nematic Phase of Poly-γ-Benzyl-ζ-Glutamate
Above a critical concentration in certain solvents poly-γ-benzyl-L-glutamate (PBLG) forms a lyotropic liquid crystal of the cholesteric structure. In the presence of sufficiently strong electric or magnetic fields this liquid crystal undergoes a mesomorphic phase transition to nematic order. Reported are the results o…
Erosion-Corrosion of Finned Heat Exchanger Tubes
Converted reformer gas on the shell side of a heat exchanger was cooled by water on the tube side. In addition to hydrogen and nitrogen, the gas contained substantial quantities of CO2 and water vapor. The tubes were integral finned of C-steel. Condensate from the gas stream filled the space between fins, while CO2 fr…
Conditions de formation de divers hydrocarbonates voisins de l'hydrotalcite
En traitant à l'ébullition des mélanges renfermant de l'Hydroxyde d'alumine et des carbonates de magnésium, de nickel ou de lithium, on obtient des composés voisins de l'hydrotalcite. A 60°C, en plaçant les produits initiaux dans des sacs à dialyse, il se forme les mêmes composés associés parfois à des impuretés. Dans…
Grain boundaries in recrystallization
In this brief survey, the theoretical models for nucleation of new grains in annealed cold-worked metals are reviewed in the light of recent researches in the author's laboratory. The importance of strain-induced boundary migration is gradually emerging. The role of vacancies in enhancing the mobility of grain boundar…
Optical absorption spectra of iron (III) and chromium (III) doped in synthetic yttrium-aluminium-garnets (YAG)
Eleven weak absorption peaks of Fe3+ and two broad absorptions of Cr3+ doped in synthetic yttrium-aluminium-garnets, Y3Al2A13O12, have been assigned to d-d transitions of the metal ions in octahedral and tetrahedral sites. All of these absorption peaks have 1:1 correspondence to transitions which are predicted to occu…