Materials Literature
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The development of Vickers indent‐induced tracks with increasing indent load has been studied in two Y 2 O 3 ‐stabilizel ZrO 2 ceramics. Such cracks form as radial or Palmqvist cracks at low loads, assume “kidney” shapes at intermediate loads, and finally form median (half‐penny) cracks at high loads. The plastic zone…
Crystals of a fragment of human fibronectin encompassing the 7th through the RGD-containing 10th type III repeats (FN7-10) have been produced with protein expressed in E. coli. The crystals are monoclinic with one molecule in the asymmetric unit and diffract to beyond 2.0 A Bragg spacings. A mutant FN7-10 was produced…
The dimer compounds ${\mathrm{Cs}}_{3}$${\mathrm{Er}}_{2}$${\mathit{X}}_{9}$ (X=Cl,Br,I) were synthesized and grown as crystals. Their f-f absorption spectra were measured and their upconversion luminescence behavior was studied as a function of temperature. Both $^{4}$${\mathit{I}}_{15/2}$${\ensuremath{\rightarrow}}^…
A vertical porous InP structure with an aspect ratio larger than 100 was obtained by electrochemical anodization of a <111>A-oriented n -InP substrate with HCl etchant. The photoluminescence spectrum of this porous InP showed less surface recombination as well as a slight blue shift attributed to the quantum-siz…
Transcriptional activation by many eukaryotic sequence-specific regulators appears to be mediated through transcription factors which do not directly bind to DNA. BmFTZ-F1 is a silkworm counterpart of FTZ-F1, a sequence-specific activator of the fushi tarazu gene in Drosophila melanogaster. We report here the isolatio…
We use the two solvation potentials discussed in the previous paper and polymer reference interaction-site model (PRISM) theory to calculate the mutually consistent single-molecule conformation and liquid structure of model linear flexible nonpolar polymers. We focus on the mean end-to-end distance R2 and radius of gy…
A procedure is described for forming a flat face on a frozen piece of plant tissue, which may then be observed fully-hydrated or lightly etched, and coated or uncoated with a metal film, in scanning electron microscopy (SEM). The frozen sample was planed with a glass knife at -80 degrees C in a cryo-ultramicrotome. Th…
The emission spectra of poli(ethylene oxide) (PEO) and poli(propylene oxide) (PPO) modified by different concentrations of europium bromide, ${\mathrm{PEO}}_{\mathit{n}}$${\mathrm{EuBr}}_{3}$ (n=8,12,16,20,24,28,32,80) and ${\mathrm{PPO}}_{\mathit{n}}$${\mathrm{EuBr}}_{3}$ (n=32,80), were recorded and the observed lin…
We have recently developed a fast approach to comparisons of 3-dimensional structures. Our method is unique, treating protein structures as collections of unconnected points (atoms) in space. It is completely independent of the amino acid sequence order. It is unconstrained by insertions, deletions, and chain directio…
The Gay Berne potential has been employed extensively in simulation studies of rod-like liquid crystals. However, the potential can be used also to study discotic liquid crystals, that is, compounds whose molecules are flattened or disc-shaped. Here we suggest a suitable parametrization for Gay-Berne discs and report…
The reproducibility of glasses of 500 hard spheres is examined. Most amorphous packings are shown to tend to the limiting density z=0.870±0.008 (relative to the close packed crystal). When the fluid is compressed through the glass transition, in a molecular dynamics experiment, fast enough to avoid crystallites, the e…
The strain hardening properties of FCC single crystals are examined with the help of a three-dimensional simulation of dislocation dynamics and interactions at mesoscale. The basic properties discussed are the line tension of the dislocations, the conditions at which sessile junctions are formed at the intersection of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComposition Dependence of the Interaction Parameter in Isotopic Polymer BlendsJ. D. Londono, A. H. Narten, G. D. Wignall, K. G. Honnell, E. T. Hsieh, T. W. Johnson, and F. S. BatesCite this: Macromolecules 1994, 27, 10, 2864–2871Publication Date (Print):May 1, 1994Publicatio…
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Synthetic biodegradable polymeric matrices, with a dense top layer and porous under-layer, made of a (poly)ether/(poly)ester (PEO:PBT) copolymer called Polyactive, and also of poly-L-lactide (PLLA), are under investigation as part of a cell-seeded skin substitute for third-degree, large-scale skin defects. The biocomp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign and Synthesis of a Trifunctional Chiral Porphyrin with C2 Symmetry as a Chiral Recognition Host for Amino Acid EstersTadashi Mizutani, Tadashi Ema, Takashi Tomita, Yasuhisa Kuroda, and Hisanobu OgoshiCite this: J. Am. Chem. Soc. 1994, 116, 10, 4240–4250Publication Dat…
The effects of various braiding parameters for 2-D triaxially braided textile composites were systematically investigated both experimentally and analytically. Four different fiber architectures designed to provide a direct comparison of the effects of braid angle, yarn size and axial yarn content were tested. Moiré i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnvironmental Effects on Nonlinear Optical Chromophore Performance. Calculation of Molecular Quadratic Hyperpolarizabilities in Solvating MediaSanto Di Bella, Tobin J. Marks, and Mark A. RatnerCite this: J. Am. Chem. Soc. 1994, 116, 10, 4440–4445Publication Date (Print):May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry and Physics of a Molecular-Based Magnet Containing Three Spin Carriers, with a Fully Interlocked StructureHumberto O. Stumpf, Lahcene Ouahab, Yu Pei, Pierre Bergerat, and Olivier KahnCite this: J. Am. Chem. Soc. 1994, 116, 9, 3866–3874Publication Date (Print):May 1…
Abstract A rapid technique for evaluating the rate and state of dispersion of carbon black in natural rubber has been extended to study the dispersion of carbon black in various polymers. The technique measures the extent and rate of dispersion of the black in the rubber. The kinetics of dispersion was characterized f…