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Abstract Free volume ideas have been employed extensively in the interpretation of equilibrium processes and as a measure of molecular mobility. More recently, the vacancy fraction h , defined in our hole theory, has served to provide a link between diverse processes. This raises a question regarding the relation betw…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic Oxidation of Dichloromethane, Chloroform, and Their Binary Mixtures over a Platinum Alumina CatalystDouglas M. Papenmeier and Joseph A. RossinCite this: Ind. Eng. Chem. Res. 1994, 33, 12, 3094–3103Publication Date (Print):December 1, 1994Publication History Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Novel Optically Active Polymethacrylamide Having L-Leucine Structure in the Side ChainFumio Sanda, Masafumi Nakamura, Takeshi Endo, Toshikazu Takata, and Hiroshi HandaCite this: Macromolecules 1994, 27, 26, 7928–7929Publication Date (Print):December 1, 1994Publi…
Zeolites as potential luminescent materials is a subject that has received little attention previously. The optical properties–UV emission and reflectance/absorbance spectra–of zeolites X and Y prepared with various degrees of Ce doping are described and an interpretation of the results is proposed based on the occupa…
The gel transformations and subsequent crystallization that occur in the precursor reaction mixture of silicalite were investigated using simultaneous small- and wide-angle X-ray scattering (SAXS–WAXS). The SAXS–WAXS measurements, together with the use of a high flux of synchrotron radiation and a newly developed high…
Penta- and hexa-substituted phenanthrenes and penta-substituted benzo[c]-phenanthrenes have been synthesized; these exhibit columnar phases and are electrically switchable when bearing chiral side chains. The liquid crystalline and electro-optical properties are described. A strong tri-state switching behaviour is obs…
N-Myristyl transferase (Nmt) catalyzes attachment of myristate onto the N terminus of suitable proteins. In order to identify amino acids important for catalytic functions, human Nmt and mutants representing all six conserved cysteine and histidine residues (Cys-169, Cys-214, His-131, His-171, His-218, and His-293) we…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOil in Water Micellar Solution Used to Synthesize CdS Particles: Structural Study and Photoelectron Transfer ReactionC. Petit, T. K. Jain, F. Billoudet, and M. P. PileniCite this: Langmuir 1994, 10, 12, 4446–4450Publication Date (Print):December 1, 1994Publication History Pu…
Tyrosine hydroxylase catalyzes the rate-limiting reaction in the biosynthesis of the catecholamine neurotransmitters and hormones (dopamine, norepinephrine, and epinephrine). Rat tyrosine hydroxylase exists, in its native form, as a tetramer composed of identical 498 amino acid subunits. There is currently no informat…
The crystal structure and optical reflectivity of AlP has been studied in a diamond anvil cell using energy dispersive x-ray diffraction to 43 GPa and micro-optical reflectance spectroscopy to 36 GPa. AlP undergoes a first order phase transformation from zincblende to a NiAs structure which exhibits metallic reflectiv…
We have isolated and sequenced a 1,486-base-pair near full-length cDNA coding for Bombyx egg cysteine proteinase. The cDNA encodes 344 amino acid residues containing a typical signal peptide sequence (16 residues), pro-peptide (104 residues), and the sequence for mature enzyme (224 residues). Sequence alignments show…
The energy transfer mechanism between an Yb 4f shell and an InP host was investigated, assuming that a nonradiative multiphonon process assists the energy transfer. The values of the energy involved in the energy transfer were determined from the results of optical and electrical experiments. Rate equations were solve…
Abstract Furylfulgides with different sizes of alkyl substituents were synthesized and their photochromic properties were examined. While the quantum yield of coloring reaction increased and the quantum yield of the E-to-Z isomerization decreased as the steric bulkiness of the alkyl substitutent on the 2,5-dimethyl-3-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-Spin Molecules: Iron(III) Incorporation into [Mn12O12(O2CMe)16(H2O)4] To Yield [Mn8Fe4O12(O2CMe)16(H2O)4] and Its Influence on the S = 10 Ground State of the FormerAnn R. Schake, Hui-Lien Tsai, Robert J. Webb, Kirsten Folting, George Christou, and David N. HendricksonCi…
Water-soluble, meso-substituted porphyrins are synthesized by sulfonation or methylation of the phenyl or pyridyl groups, respectively, of some non-water-soluble functionalized porphyrins that we have recently synthesized (Can. J. Chem. 72, 1894 (1994)). Twelve anionic sulfonated and seven cationic methylpyridinium po…
(100), (111), and randomly aligned lead zirconate titanate thin films on Pt/Ti/Corning 7059 glass substrates were prepared using a sol-gel method. The thin films, having different alignments, were fabricated by different drying conditions for pyrolysis. The hysteresis loop and the capacitance-voltage characteristics w…
Abstract The morphology and properties of high modulus polypropylenes (PP) are characterized over a wide range of material variables. These variables include the tacticity, room temperature xylene solubles (XSRT), molecular weight, melt flow rate (MFR), and polydispersity index (PI). Flexural modulus in quench‐cooled…
A homologous series of biamphiphilic 1,2Ψω-alkan-tetraols has been synthesized. They form lamellar thermotropic liquid crystalline phases which have been studied by polarizing optical microscopy, as well as by X-ray investigations. Those compounds with a rather long polymethylene chain between the two diol groups exhi…
Persistent and time-resolved transient holes were burnt into the $^{1}\mathrm{D}_{2}$${\ensuremath{\leftarrow}}^{3}$${\mathrm{H}}_{4}$ transition of ${\mathrm{Pr}}^{3+}$ and the $^{5}\mathrm{D}_{0}$${\ensuremath{\leftarrow}}^{7}$${\mathrm{F}}_{0}$ transition of ${\mathrm{Eu}}^{3+}$ in silicate glasses. The holewidths…
With a combination of information from TG/IR and GC/IR measurements of the trapped gases, characterization of complex polymer decompositions can be made. In this paper, the thermally induced breakdown of ethylene-vinyl acetate (EVA) copolymers was studied. Results show that EVA undergoes a two-step decomposition: an a…