Electrochromic Molybdenum Oxide Thin Films Prepared by Electrodeposition
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Purification and characterization of glucose dehydrogenase from the thermoacidophilic archaebacterium Thermoplasma acidophilum
Glucose dehydrogenase was purified to homogeneity from the thermoacidophilic archaebacterium Thermoplasma acidophilum. The enzyme is a tetramer of polypeptide chain Mr 38,000 +/- 3000, it is catalytically active with both NAD+ and NADP+ cofactors, and it is thermostable and remarkably resistant to a variety of organic…
Five- and six-coordinated Si in K2Si4O9 glass quenched from 1.9 GPa and 1200 °C
It has often been suggested that a high pressure, Si in silicate melts should change from four to higher coordination. Transition states involving five-coordinated Si have often been observed in molecular dynamics simulations even at low pressure and have been given a key in configurational change and viscous flow. Us…
The heat capacity and glass transition of hyperquenched glassy water
The glass transition and heat capacity of hyperquenched glassy water have been studied by differential scanning calorimetry and by isothermal measurements from 103 K to a temperature where its crystallization to cubic ice is complete. Glassy water shows a thermally reversible glass-liquid transition and has a Tg, of 1…
X-ray absorption edge and EXAFS study of the copper sites in zinc oxide methanol synthesis catalysts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray absorption edge and EXAFS study of the copper sites in zinc oxide methanol synthesis catalystsLung Shan Kau, Keith O. Hodgson, and Edward I. SolomonCite this: J. Am. Chem. Soc. 1989, 111, 18, 7103–7109Publication Date (Print):August 1, 1989Publication History Published…
A Study of Conducting Polymer Morphology: The Effect of Dopant Anions Upon Order
A series of freestanding conducting polypyrrole and poly‐3‐methylthiophene films was prepared and examined by x‐ray diffraction and transmission electron microscopy (TEM). The degree of order observed in polypyrroles was highly dependent upon the incorporated "dopant" anions and also on deposition conditions. Examinat…
Observations on silver salt metathesis reactions with very weakly coordinating anions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservations on silver salt metathesis reactions with very weakly coordinating anionsDavid J. Liston, Young Ja Lee, W. Robert Scheidt, and Christopher A. ReedCite this: J. Am. Chem. Soc. 1989, 111, 17, 6643–6648Publication Date (Print):August 1, 1989Publication History Publi…
OH substitution in garnets: X-ray and neutron diffraction, infrared, and geometric-modeling studies
Tetrahedral-site occupations were determined for three titanian andradites (San Benito County, California) and a synthetic deuterated hibschite by using X-ray single-crystal and neutron powder data, respectively. Site refinements reveal the presence of tetrahedral vacancies (4-14%) in all three andradites. Infrared ab…
Effects of Acacia arabica and Caralluma edulis on blood glucose levels of normal and alloxan diabetic rabbits.
The powdered seeds of Acacia arabica and roots of Caralluma edulis were administered in doses of 2, 3 and 4 gm/kg body-weight to normal and alloxan-diabetic rabbits. The blood glucose levels were estimated before and 2, 4, 6 and 8 hours after the administration of plant suspension. The powdered seeds of Acacia arabica…
Metastability of the Martensitic Transformation in a 12 mol% Ceria‐Zirconia Alloy: II, Grinding Studies
Observations of the grinding‐induced transformation in singlephase Ce‐TZP materials, referred to in an earlier paper, are presented. Two techniques were used to grind the surface: by hand in a slurry of abrasive particles and with a high‐speed diamond‐impregnated wheel. Significant differences in X‐ray diffraction pro…
Fusible Conducting Poly(9-alkylfluorene) and Poly(9,9-dialkylfluorene) and Their Characteristics
Conducting poly(9-alkylfluorene) and poly(9,9-dialkylfluorene) with long alkyl chains have been prepared and found to be fusible at relatively low temperature. Unlike in poly(3-alkylthiophene), electrical conductivity and band gap energy do not change remarkably at the solid-liquid phase transition. These polymers als…
Ethylene epoxidation on silver(110): the role of subsurface oxygen
Electronic structure calcns. were performed on the chemisorption of at. oxygen on Ag(110) and on the subsequent reaction of this chemisorbed oxygen with ethylene. These calcns. show that the presence of subsurface oxygen (i) reduces the bond energy between silver and adsorbed oxygen and (ii) converts the repulsive int…
2,2,4,4,5,5-Hexakis(2,6-diethylphenyl)pentastanna[1.1.1]propellane: characterization and molecular structure
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT2,2,4,4,5,5-Hexakis(2,6-diethylphenyl)pentastanna[1.1.1]propellane: characterization and molecular structureLawrence R. Sita and Richard D. BickerstaffCite this: J. Am. Chem. Soc. 1989, 111, 16, 6454–6456Publication Date (Print):August 1, 1989Publication History Published on…
p‐Quinodimethane Analogues of Tetrathiafulvalene
The quinonoid analogues of TTF are better electron donors than TTF itself. Their prototype 4 has now been synthesized for the first time. Wittig–Horner reaction of the dithiol derivative 1 with the cyclopentadiene adduct of benzoquinone, 2, gives 3, which undergoes retro-Diets–Alder reaction to yield 4 as dark red cry…
Use of liposomes as injectable-drug delivery systems
The formation of liposomes and their application as delivery systems for injectable drugs are described. Liposomes are microscopic vesicles composed of one or more lipid membranes surrounding discrete aqueous compartments. These vesicles can encapsulate water-soluble drugs in their aqueous spaces and lipid-soluble dru…
Optical properties of electrochromic vanadium pentoxide
Electrochemical and spectroscopic measurements were used to characterize the electrochromic behavior of sputtered V2O5 films. In response to lithium intercalation, the fundamental optical absorption edge of V2O5 shifts to high energies by 0.20–0.31 eV as the lithium concentration increases from Li0.0V2O5 to Li0.86V2O5…
Inclusion of polyaniline filaments in zeolite molecular sieves
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInclusion of polyaniline filaments in zeolite molecular sievesPatricia Enzel and Thomas BeinCite this: J. Phys. Chem. 1989, 93, 17, 6270–6272Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published inissue 1 August 1989https://pubs.acs.o…
Acidophilic and thermophilicBacillusstrains from geothermally heated antarctic soil
Bacteria with temperature optima of 51–54°C and pH optima of 3.5–4.5 were isolated from geothermal soil collected from Mount Erebus, Ross Island, Antarctica. The isolates were enriched on medium designed for the growth of Thermoplasma but the strains found were members of the genus Bacillus. Comparisons with other the…
Role of reactive elements in alloy protection
Reactive element additions may promote the formation of protective oxide scales on high temperature alloys, and improve long term oxidation resistance by limiting the rate of scale growth and inhibiting scale failure processes. Various modifications to transport properties and mechanical behaviour have been proposed t…
Luminescence study of complexation of europium and dicarboxylic acids
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence study of complexation of europium and dicarboxylic acidsPierre P. Barthelemy and Gregory R. ChoppinCite this: Inorg. Chem. 1989, 28, 17, 3354–3357Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published inissue 1 August 1989…