Materials Literature
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In the salt formed by bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) with the $[{\mathrm{Mo}}_{6}{\mathrm{O}}_{19}{]}^{2\mathrm{\ensuremath{-}}}$ anion, the ${\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F}}^{+}$ cations form quasi-isolated dimers. For this reason $({\mathrm{B}\m…
The recent development of density functional theory (DFT) makes it possible to calculate accurately metalloporphyrin structures and potential surfaces. This is illustrated for nickel porphine, the vibrations of which are reliably assigned from extensive spectroscopic studies. With a minimal set of scaling factors, the…
A new dosimetric quantity, the lateral build-up ratio (LBR), has been introduced to calculate depth dose distribution for any shaped field. Factors to account for change in incident fluence with collimation are applied separately. The LBR data for a small circular field are used to extract radial spread of the pencil…
Abstract The transformation of smectite into kaolinite and kaolinite-smectite interstratification were studied in samples belonging to the Argiles Plastiques formation of the Paris basin, by high-resolution transmission electron microscopy (HRTEM). Two original smectite phases, 1) beidellite with 1-nm-thick layers, an…
Monitoring the generation of cavitation is of great interest for diagnostic and therapeutic use of ultrasound in medicine, since cavitation is considered to play a major role in nonthermal ultrasound interactions with tissue. Important parameters are the number of cavitation events and the energy released during the b…
Many biological applications of small-angle X-ray scattering, in particular time-resolved studies, are often limited by the flux incident on the sample due to the smaller scattering cross section of biological specimens. The wider-energy bandpass of a monochromator that consists of a pair of synthetic multilayer micro…
The macromolecular substitution approach for the synthesis of polyphosphazenes provides access to many different polymers. However, it precludes the use of reagents that contain two or more functional groups because such compounds would cause extensive crosslinking of the chains. This presents a problem because many o…
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…