Materials Literature
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Supramolecular ferroelectric liquid crystalline complexes have been obtained from 4-alkoxybenzoic acids and optically active trans-4-substituted-4′-stilbazoles. Chiral smectic C phases are induced by the formation of supramolecular mesogenic structure through the selective intermolecular hydrogen bond between the achi…
We have fabricated pliable, porous, biodegradable scaffolds with poly(lactic-co-glycolic acid) (PLGA) and poly(ethylene glycol) (PEG) blends using a solvent-casting and particulate-leaching technique. Our study investigated the effects of four different processing parameters on pliability and pore morphology of the bi…
The three-dimensional structure of the manganese-phosphate complex of inorganic pyrophosphatase from Saccharomyces cerevisiae has been refined to an R factor of 19.0% at 2.4-A resolution. X-ray data were collected from a single crystal using an imaging plate scanner and synchrotron radiation. There is one dimeric mole…
${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{CoO}}_{3}$ (LSCO) has recently been found to exhibit large magnetoresistance (MR) effect. In this paper, microstructures of LSCO thin films, which may provide important clues for understanding the unusual MR characteristics in th…
Nonuniform precipitant and impurity incorporation in protein crystals can cause lattice strain and, thus, possibly decrease the X-ray diffraction resolution. To address this issue, a series of crystallization experiments were carried out, in which initial supersaturation, NaCl concentration, protein purity level and c…
Formation of reverse cylindrical micelles of a block copolymer with a long core block is kinetically controlled. The diagram shows the relative energy of the different structures.
As a model compound in the thiaporphyrin series, the perchlorate of the dication 1 is ideal because of its favorable solubility properties. The key step in its synthesis is the acid-induced condensation (not biomimetic!) of 3,4-diethyl-2-hydroxymethylthiophene that affords the tetra- as well as the pentacyclocondensat…
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…