Materials Literature
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Thermoplastic elastomer gels (TPEGs) composed of a poly[styrene-b-(ethylene-co-butylene)-b-styrene] triblock copolymer and a low-volatility, midblock-compatible mineral oil have been investigated here to ascertain the effects of composition on TPEG morphology, and temperature on mechanical properties. Cryofracture-rep…
Poly(2-methacryloyloxyethyl phosphorylcholine) (pMPC) was grafted onto the surface of a silicon rubber (SR) membrane (pMPC-SR) by plasma induced grafted copolymerization (PIP). Argon plasma was used to activate the SR surfaces. Determination was also made of the influences of grafted copolymerization reaction time, re…
Humidity‐sensitive polyaniline derivatives/polyvinyl alcohol (PVA) composites have been studied using thermogravimetric (TG)/mass (MS) and in situ Fourier transform infrared spectroscopy. The electrical conductivity of the poly( o ‐phenylenediamine) (PoPD)/PVA and poly( o ‐aminophenol) (PoAP)/PVA composites were linea…
Supramolecular dissociation of biodegradable polyrotaxanes via terminal hydrolysis by an enzyme (papain) in vitro was investigated in relation to their solution properties. The polyrotaxanes were synthesized by the introduction of L-phenylalanine (L-Phe) at both ends of an inclusion complex consisting of α-cyclodextri…
An experimental and numerical study of transient shock wave phenomena in a liquid containing noncondensable gas bubbles is presented. Experiments are done in a shock tube with an upwardly directed bubbly flow to obtain a uniform spatial distribution of bubbles. The bubbly flow has an initial gas volume fraction of 0.2…
The electrical resistivity (\ensuremath{\rho}), magnetoresistance $(\ensuremath{\Delta}\ensuremath{\rho}/\ensuremath{\rho}),$ heat capacity $(C),$ and magnetization $(M)$ behavior in a number of Gd alloys are reported. Particular attention is paid to the \ensuremath{\rho} and $\ensuremath{\Delta}\ensuremath{\rho}/\ens…
An ethyl acetate extract of Polygonum multiflorum Thunb. (PME) was fractionated into an anthraquinone-containing (PME-I) and a non-anthraquinone-containing (PME-II) fraction. The effects of PME and its related extracts pretreatment on myocardial ischemia-reperfusion (IR) injury in isolated perfused rat hearts were exa…
Our recent work directed at the design, synthesis, characterization and applications of new types of polyborazylene and polyborosilazane polymers is reviewed with a focus on the use of these polymers as processable precursors to BN and SiNCB composites. A design strategy based on the controlled functionalization of pr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis, Crystal Structure, and Electronic Structure of a 5,15-Dialkylideneporphyrin: A TCNQ/Porphyrin HybridIain M. Blake, Harry L. Anderson, David Beljonne, Jean-Luc Brédas, and William CleggView Author Information Department of Chemistry, University of Oxford Dyso…
We propose a means of accounting for the contribution of counterions to the ionic strength within a polyelectrolyte brush, which is then incorporated into models treating the effects of electrostatic interactions, chain stretching, and curvature on the layer thickness for chains attached to a spherical particle. Combi…
In aspartate aminotransferase, pyridoxal 5'-phosphate (PLP) forms a Schiff base with the epsilon-amino group of Lys258 (internal aldimine). The internal aldimine has a pKa value of 6.8. Binding of a substrate amino acid to the enzyme yields the Michaelis complex, in which PLP still forms the internal aldimine with Lys…
The closely related crystal structures of the compounds La(6)Ni(2)Si(3) (La(12)Ni(4)Si(6), n = 2) and La(5)Ni(2)Si(3) (La(20)Ni(8)Si(12), n = 3) as well as those of the new compounds La(15)Ni(7)Si(10) (La(30)Ni(14)Si(20), n = 4) and La(21)Ni(11)Si(15) (La(42)Ni(22)Si(30), n = 5) were determined from single-crystal X-r…
A La0.7Ca0.3MnO3 thin film made by pulsed laser deposition (PLD) and another film of the same composition made by metal organic chemical vapor deposition (MOCVD), both on single crystal LaAlO3, were subject to a series of six, short, controlled anneals. The oxygen content was purposely not changed in the films from th…
A family of bis-urea derivatives has been synthesized and shown to function as effective gelators in certain organic solvents. The X-ray structure of one bis-urea shows a cylindrical hydrogen bonding network with extensive interdigitation of the alkyl esters which project from the central rod.
The luminescent properties of undoped ZnO quantum dots encapsulated in various stabilizing agents have been investigated at room temperature. Stoichiometric as well as non-stochiometric ZnO quantum dots have been prepared by different routes. These studies indicate the importance of OH radical on the surface of ZnO qu…
The gene glvA (formerly glv-1) from Bacillus subtilis has been cloned and expressed in Escherichia coli. The purified protein GlvA (449 residues, Mr = 50,513) is a unique 6-phosphoryl-O-alpha-D-glucopyranosyl:phosphoglucohydrolase (6-phospho-alpha-glucosidase) that requires both NAD(H) and divalent metal (Mn2+, Fe2+,…
Carboxylate-containing polyamides were synthesized from 2,6-di(amino)benzoic acid and dimethylmalonyl dichloride, isophthaloyl dichloride, and fumaryl dichloride. These polymers, {NHC 6 H 3 (COO)NHCOC(CH 3 ) 2 CO} n, {NHC 6 H 3 (COO)NHCO- m -C 6 H 4 CO} n, and {NHC 6 H 3 (COO)NHCO- trans -CH CHCO} n, have seven to eig…
The complete and original calculation scheme beyond the finite difference approximation, for the atomic (and orbital) Fukui function (FF) indices is proposed. The method explores an expansion for derivatives of LCAO coefficients, ∂C/∂N=CU. The separation scheme for the U matrix has been elaborated at the ab initio lev…
The (1- x )LaAlO 3 – x SrTiO 3 solid solution system with the perovskite structure was synthesized and its dielectric behavior was investigated. The lattice parameter of (1- x )LaAlO 3 – x SrTiO 3 increases with increasing the fraction of SrTiO 3 in the system. 0.45LaAlO 3 –0.55SrTiO 3 shows a dielectric constant ε of…
Molecular polarizabilities and hyperpolarizabilities of a series of octupolar molecules that are donor-substituted triphenylmethane dyes are calculated. The four-state model of an octupolar molecule is used to describe the nonlinear optical properties of this type of molecules. As the charge-transfer character of the…