Materials Literature
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An aryl phosphinate anhydride (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide)-methyl succinic anhydride (DMSA), with a pendent phosphorus group was synthesized and used as a reactive type flame retardant. The structure of DMSA was confirmed by FTIR, mass, elemental analysis, 1H and 31P NMR spectroscopies. The ary…
We have recorded X-ray diffraction patterns at 3.1 A resolution from magnetically aligned fibres of the Pf3 strain of filamentous bacteriophage (Inovirus). The patterns are similar to patterns from the higher-temperature form of the Pf1 strain, indicating that the Pf3 and Pf1 virions have the same helix symmetry and s…
Haloalkane dehalogenase (DhlA) catalyzes the hydrolysis of haloalkanes via an alkyl-enzyme intermediate. Trp175 forms a halogen/halide-binding site in the active-site cavity together with Trp125. To get more insight in the role of Trp175 in DhlA, we mutated residue 175 and explored the kinetics and X-ray structure of…
Hydrogen-bonding networks are believed to play an important role in electron-transfer pathways in a protein medium. A porphyrin−quinone donor−acceptor compound with a depsipeptide bridge which forms a β-turn has been synthesized to study hydrogen bond-mediated electron transfer. The placement of the donor and acceptor…
Using crystallographic information and empirical potentials derived from fitting the vibrational frequencies of all the substances under study, together with those of a group of silicates and oxides, a Born–von Karman rigid-ion lattice-dynamical model has been applied to the whole Brillouin zone in calcite, aragonite…
Static scaling analysis of the paraelectric susceptibility ${\ensuremath{\chi}}^{\ensuremath{'}}$ of ${\mathrm{SrTiO}}_{3}:\mathrm{C}\mathrm{a}$ as a function of temperature T and an external electric field E yields a very good scaling behavior with consistent values of the effective exponents \ensuremath{\gamma}, \en…
The results of ab initio calculations of in-crystal ionic polarizabilities, α, over a wide range of lattice parameters, R, are presented for LiF, NaF, KF, LiCl, NaCl, KCl, LiBr, NaBr, KCl, and MgO. The derivatives of the mean polarizability with respect to lattice parameters are compared with experimental values obtai…
The band edge photoluminescence (PL) of bulk single-crystal n -CdSe is perturbed by adsorption of tri- n -octylphosphine oxide (TOPO) from toluene solution onto the crystal's 0001, 0001̄, and 112̄0 faces. These are three of the crystal faces observed in studies of CdSe nanocrystals, which are commonly capped with TOPO…
Poloxamer 407 and poloxamine 908 have been used by many research groups to modify the surface of both model latex and biodegradable nanospheres, thereby producing nanospheres that have shown reduced protein adsorption in vitro and extended circulation times in vivo. A potential limitation of such systems is the desorp…
The objective of this investigation was to examine whether the silt in loess-derived soils represents a major K+ source for plants. The experiment was carried out with 14 arable loess-derived soils (Alfisols) from which, in one series, the clay was removed and in which, in another series, complete soils were used. In…
We have studied the effects of oscillatory shear strain on the structure of a colloidal hard-sphere glass. By light scattering, we measure the kinetic development of ordered structures induced by shearing between parallel plates. Diffusing wave spectroscopy ``echo'' experiments show that for peak to peak oscillatory s…
Energy-dispersive X-ray diffraction (EDXRD) has been used to perform in situ kinetic studies on the intercalation of cobaltocene, Co(η-C 5 H 5 ) 2, into the layered dichalcogenides ZrS 2, 2H-SnS 2, 2H-SnSe 2, 2H-TaS 2, 2H-NbS 2, 1T-TaS 2, and TiS 2 . Integrated intensities of the Bragg reflections have been used to de…
We investigated the ethylene copolymerization by utilizing Me2Si(Ind)2ZrCl2/MAO and Me2Si(Ind)2ZrCl2/MAO/SiO2 with 10-undecene-1-oxytrimethylsilane and 10-undecene-1-oxytriisopropylsilane and the ethylene copolymerization by using iPr(CpInd)ZrCl2/MAO and iPr(CpInd)ZrCl2/MAO/SiO2 with 5-norbornene-2-methyleneoxytrimeth…
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…