Materials Literature
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Abstract This article outlines a Monte Carlo approach for simulating crystallization processes both as an alternative to solving the population balance equations (PBE) and as a way of conducting multicoordinate simulations that are too complex to be solved as PBEs. First, simple cases with different combinations of nu…
We isolated a miniTn10(Cmr) insertion mutant lacking pyridoxine (PN) kinase and cloned the structural gene, designated pdxK, by complementation. P1 transduction and PCR mapping and DNA sequence analysis showed that pdxK was adjacent to the crr sugar transport gene (53.95 min). Growth properties of pdxK::miniTn10 mutan…
The first few monolayers of silver deposited on the Pt(111) surface bear a giant compressive surface stress. The stress is more than an order of magnitude larger than the stress caused by the lattice mismatch and results presumably from the charge transfer from Ag to Pt. Upon annealing to 600 K, the stress relaxes by…
Refolding of proteins at high concentrations often results in aggregation. To gain insight into the molecular aspects of refolding and to improve the yield of active protein, we have studied the refolding of lysozyme either from its denatured state or from its denatured/reduced state. Refolding of denatured lysozyme,…
The effect of carrier concentration on fulleride superconductivity is studied by x ray, Raman, magnetization, and ESR of two new cubic families: ${\mathrm{Na}}_{2}{\mathrm{Cs}}_{x}{\mathrm{C}}_{60}$ $(0<x<1)$ and ${M}_{3\ensuremath{-}y}{\mathrm{Ba}}_{y}{\mathrm{C}}_{60}$ ( $0.2<y<2$, $M\phantom{\rule{0ex}{…
Abstract When polymer blends are prepared from a mixture of pellets, the melting order of the components is important in determining the mechanism of morphology development. Here, we show that an inversion of phase continuity occurs during processing when a minor phase component has a softening or melting transition t…
N-Acetylneuraminic acid (NeuAc) is an important molecule in biological recognition systems. NeuAc is known to be biosynthesized either from UDP-N-acetyl-D-glucosamine by an action of UDP-N-acetyl-D-glucosamine 2-epimerase or from N-acetyl-D-glucosamine by N-acyl-D-glucosamine 2-epimerase (GlcNAc 2-epimerase). However,…
OBJECTIVE: Poly(lactic acid-co-glycolic acid) (PLAGA) microspheres are promising systems for interstitial chemotherapy of brain tumors. They can be readily implanted by stereotaxy and are biocompatible with the brain, in which they are totally biodegraded within 2 months. 5-Fluorouracil (5-FU) was selected for encapsu…
Large signal-to-background (S/B) ratios for the Fe(CN)(6)(3)(-)(/4)(-) and IrCl(6)(2)(-)(/3)(-) redox couples in KCl have been observed in cyclic voltammetric measurements made at a conductive diamond thin-film electrode without any conventional surface pretreatment. The S/B ratios were a factor of ∼16 and 8 larger at…
The $^{13}\mathrm{C}$ nuclear spin-lattice relaxation rate, $^{13}$${\mathit{T}}_{1}^{\mathrm{\ensuremath{-}}1}$, has been measured in the superconducting state of \ensuremath{\kappa}-(BEDT-TTF${)}_{2}$Cu[N(CN${)}_{2}$]Br in a field parallel to the conducting layers. The $^{13}$${\mathit{T}}_{1}^{\mathrm{\ensuremath{-…
A computer program, called OOPS, is described which facilitates and speeds up the process of rebuilding a protein structure inside its electron density and reduces the chances of local errors persevering throughout the crystallographic protein structure determination process. The program uses a set of criteria to judg…
A genetic and phenotypic analysis of the gene pannier is described. Animals mutant for strong alleles die as embryos in which the cells of the amnioserosa are prematurely lost. This leads to a dorsal cuticular hole. The dorsal-most cells of the imagos are also affected: viable mutants exhibit a cleft along the dorsal…
Abstract Amorphous carbon nitride coatings of thickness of 5 and 30 nm were deposited onto 65 and 95 mm magnetic thin-film rigid disks surfaces using single-cathode and dual-cathode magnetron sputtering systems containing nitrogen-argon plasmas. Under optimum deposition conditions, amorphous carbon nitride coatings ca…
Liquid crystalline compounds containing a difluoromethyleneoxy (CF 2 O) bridge , which increases the polarity, have been synthesized and investigated. The physical properties related to liquid crystal applications (i.e., phase transitions, viscosity, dielectric anisotropy, birefringence) are reported. The compounds sh…
Waveguide grating couplers allow the essential function of waveguide access to be integrated together with optical processing functions on a monolithic planar substrate. Grating coupling technology is topologically and, to a large extent, technologically compatible with the planar processes which define the optical pr…
X-ray diffuse scattering from protein crystals is, at the moment, the only available experimental process to be directly sensitive to long-range correlations between protein-atom displacements. It is shown here that calculations based on independent rigid-body displacements of individual molecules yield a description…
Thermal decomposition of normal transition metal selenite dihydrates, MSeO2.2H2O; M [dbnd] Cu(II), Ni(II), Co(II) was traced by TGA/DTA measurements from 50–700°C. The thermal products were obtained by heating the selenites in an air-oven to different temperatures, as determined from TGA/DTA curves, where different co…
Abstract The results described herein demonstrate the advantages of functionalized initiators with respect to the efficiency of α-chain-end functionalization and the ability to effect post-polymerization functionalization and linking reactions with the living ω-carbanionic chain ends. Not all functionalized initiators…
Transition metal oxides are important materials in heterogenous catalysis, as supporting materials as well as active components. The catalytic activity of Cr2O3 for IE polymerization of olefines or hydrogenation of alkenes is well known and rather high. Therefore, it is important to get information on the surface elec…
The disappearance of the boroxol rings has been identified as the microscopic structural change which occurs in a-${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$ upon pressure induced densification. Although changes in ``ring statistics'' is often assumed to be responsible for densification, our results provide the first unambig…