Prochloron, type genus of the Prochlorophyta
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The Structure of the Cyclodextrin Complex. V. Crystal Structures of α-Cyclodextrin Complexes with p-Nitrophenol and p-Hydroxybenzoic Acid
Abstract α-Cyclodextrin (α-CDx) forms a 1 : 1 complex with p-nitrophenol (p-NP) and p-hydroxybenzoic acid (p-HB). The crystal structures were determined by the X-ray method. The crystals of both complexes are orthorhombic, and the space group is P212121 with Z=4. The cell dimensions are a=13.455(1), b=15.296(1), and c…
Laminated algal mats from a coastal lagoon, Laguna Mormona, Baja California, Mexico
Abstract Laminated algal mats are well developed at Laguna Mormona, a closed hypersaline lagoonal complex on the west coast of Baja California, Mexico. These mats and underlying organic accumulations attain a maximum thickness of 30 cm. Their morphology is controlled mainly by the degree of desiccation: mound-shaped s…
Disposition requirements for binding in aqueous solution of polar substrates in the cyclohexaamylose cavity
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDisposition requirements for binding in aqueous solution of polar substrates in the cyclohexaamylose cavityRaymond J. Bergeron, Michael Almy Channing, George J. Gibeily, and David M. PillorCite this: J. Am. Chem. Soc. 1977, 99, 15, 5146–5151Publication Date (Print):June 1, 1…
Acoustic Emission in Subcooled Nucleate Pool Boiling
Intensity and power spectral density of acoustic emission in subcooled nucleate pool boiling of water from boiling inception to the heater burnout was investigated experimentally. Platinum and Ni-Cr wires with dia. 1.0 mm or smaller were used as the heater. The measurements were performed in containers at atmospheric…
Infrared and Raman Spectroscopy of Cellulose
The technique of polarized infrared spectroscopy was first used to study the structure of cellulose by Tsuboi( 1 ), Marrinan and Mann( 2,3 ), and Liang and Marchessault( 4-6 ), in the late 1950s. At that time the crystal structures of celluloses I and II were unknown, and the spectroscopic investigations were undertak…
The Thermal Expansion of GeS and GeTe
Abstract The thermal expansion of GeS has been studied above room temperature up to the melting point of 658 ± 5°C by X‐ray diffraction techniques using a 190 mm diameter Unicam high temperature camera. The thermal expansion of the crystallographic axes is linear with distinct changes in the rate of expansion at about…
The Anodic Oxidation of Tungsten in Aqueous Base
The kinetics of the anodic oxidation of tungsten metal in basic aqueous solution has been investigated using galvanostatic polarization. Anodic Tafel slopes were constant over all concentrations of hydroxide at 0.136 V/decade. Cathodic Tafel slopes ranged from 0.069 to 0.197 V/decade, increasing with hydroxide ion act…
Thermally stimulated currents in polyethylene and ethylene–vinyl-acetate copolymers
Thermally stimulated currents (TSC) from polyethylene and ethylene–vinyl-acetate copolymers with a variety of vinyl-acetate contents have been investigated using a TSC technique with x-ray irradiation. Five main TSC peaks, which we believe are due to trapped carriers, were observed in these polymers. The detrapping of…
The Influence of Contaminants on the Failure of Protective Organic Coatings on Steel
While the ability of the organic coating to conduct corrosion currents may sometimes come into play, primarily the corrosive deterioration of protective organic coatings is brought above by the flow of corrosion currents through a film of electrolyte beneath the organic coating. Any of several specific mechanisms may…
Magnetic properties and structures of some ordered (FeMn) 3 Si alloys
Magnetic and crystallographic properties of the (FeMn) 3 Si system have been studied by X-ray and neutron diffraction magnetization resistivity and magnetoresistivity measurements. The single-phase alloys have been found to crystallize in the L2 1 A structure and to have ferromagnetic properties at low Mn concentratio…
Attribution of the OH stretching bands of kaolinite
Abstract Examination of the infrared spectra of synthetic kaolinites, with various degrees of substitution of hydroxyls by OD groups, allows a more detailed attribution of the stretching bands due to inner-surface hydroxyls of kaolinite. Among the three innersurface OH groups of the unit cell, two are nearly perpendic…
Castor-oil-based interpenetrating polymer networks: Synthesis and characterization
Castor oil was polymerized and crosslinked with sulfur or diisocyanates to form the vulcanized and urethane derivatives, respectively. Both types were swollen with a plastic-forming monomer plus crosslinker, and a second polymerization was carried out in situ. Polyblends were also made by emulsion polymerization of st…
Mechanism of anodic spark deposition.
Coatings of Al/sub 2/O/sub 3/ up to 12 mil thick were deposited on Al anodes from aqueous solutions of NaAlO/sub 2/ by anodic spark deposition. Although the applied potential ranged from 415 to 540V dc, >97 percent of the potential drop occurred within 2.8 x 10/sup 4/ A/cm/sup 2/. The lifetime of a single spark was ap…
Origin of double melting peaks in drawn nylon 6 yarns
Abstract The differential scanning calorimetry (DSC) melting curves of drawn nylon 6 were studied from the standpoint of reorganization of the crystals during the heating process. A new method was presented to obtain the DSC curve associated with the growth and melting of the original crystals, and that with the recry…
The Hydrothermal Transformation Of Sodium And Potassium Smectite Into Mixed-Layer Clay
Abstract The transformation of sodium and potassium smectite into mixed-layer clay was followed in hydrothermal kinetic experiments. Glasses of beidellite composition and the Wyoming bentonite were used as starting materials. Temperatures ranged between 260 and 490°C at 2 kbar pressure, and run times ranged between 6…
A reinvestigation of takovite, a nickel aluminum hydroxy-carbonate of the pyroaurite group
Samples from Takovo, Serbia (the type locality); Perseverance Mine, Agnew, Australia; and Var, France, were examined by X-ray powder diffraction, infrared and optical absorption spectroscopy, and thermogravimetric and chemical analysis. X-ray powder data are indexed with a hexagonal unit cell, and for the Takovo sampl…
Products formed by photosensitized oxidation of unsaturated fatty acid esters
Abstract and Summary Photosensitized oxidation of unsaturated fatty acid methyl ester was carried out using methylene blue as a sensitizer. Oxidation products, monohydro‐peroxides, were identified as trimethylsilyl derivatives. Methyl oleate gave the 9‐ and 10‐isomers; methyl linoleate, the 9‐, 10‐, 12‐, and 13‐isomer…
Formation of superoxide ion during the decomposition of hydrogen peroxide on supported metals
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of superoxide ion during the decomposition of hydrogen peroxide on supported metalsYoshio Ono, Tsuyoshi Matsumura, Nobumasa Kitajima, and Shunichi FukuzumiCite this: J. Phys. Chem. 1977, 81, 13, 1307–1311Publication Date (Print):June 1, 1977Publication History Publ…
Origin of subaerial Holocene calcareous crusts: role of algae, fungi and sparmicritisation
ABSTRACT The Pleistocene Miami Limestone that crops out on the lower Florida Keys is overlain by thin (16 cm or less), discontinuous, Holocene calcareous crusts (caliche) that are usually laminated, composed dominantly of calcite micrite and may or may not incorporate part of the underlying limestone. Both allochems a…