Materials Literature
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Many materials used in the medical device industry were not originally developed for these applications. In general, these materials elicit adverse biologic responses when in contact with body fluids such as blood, and the mechanisms of the response of blood to an artificial surface are well characterized. Protein ads…
RATIONALE AND OBJECTIVES: Gadobutrol is a new gadolinium-based hydrophilic and neutral macrocyclic contrast medium for magnetic resonance imaging. In this article, the authors report on the first application of gadobutrol in humans, up to a dose of 0.5 mmol/kg. METHODS: Gadobutrol was investigated after single intrave…
We determined the three-dimensional structures of aspartate aminotransferase (AspAT) from Escherichia coli and its complex with inhibitor (2-methyl-L-aspartate) at 1.8A resolution. This enzyme reversibly catalyzes the transamination reaction and is a dimer of two identical subunits. Each subunit has 396 amino acid res…
A theory is presented to describe the orientational dynamics of block copolymer lamellar phases subjected to steady shear flow. By modifying an earlier theory by Cates and Milner to incorporate different viscosities of the pure block components, as well as restoring some neglected couplings between the mean compositio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Chiral Quaternary Ammonium Salts on (salen)Mn-Catalyzed Epoxidation of cis-Olefins. A Highly Enantioselective, Catalytic Route to Trans-EpoxidesSukbok Chang, Jennifer M. Galvin, and Eric N. JacobsenCite this: J. Am. Chem. Soc. 1994, 116, 15, 6937–6938Publication Da…
A problem of the equilibrium orientation of an elongated solid particle put inside a uniformly aligned nematic liquid crystal is studied. The particle is assumed to be sufficiently large so that the orientational distortions it causes may be treated in the framework of the continuum theory. Three kinds of anchoring of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContact Angle of Water on Polymer SurfacesT. Yasuda, T. Okuno, and H. YasudaCite this: Langmuir 1994, 10, 7, 2435–2439Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July 1994https://pubs.acs.org/doi/10.1021/la00019a068h…
Many of the properties of orientationally disordered crystals are profoundly affected by the coupling (known as translation-rotation coupling) between translation displacements and molecular orientation. The consequences of translation-rotation coupling depend on molecular and crystal symmetry, and vary throughout the…
Two poly(ethylenepropylene)–poly(ethylethylene) (PEP-PEE) diblock copolymer melts, containing 25% and 83% by volume PEP, were investigated using small-angle neutron scattering (SANS) and rheological measurements. The SANS measurements were performed with the aid of an in situ shearing device operated directly in the n…
Today the determination of successful crystallization conditions for a particular macromolecule remains a highly empirical process. Sparse-matrix and grid-screening procedures are rapid and economical means to determine preliminary crystallization conditions. During optimization the variable set (pH, precipitant type…
The bulk and surface structure of two BaTiO3 powders has been investigated by FT-IR and FT-Raman spectroscopies. A high-area sample (39 m2/g), produced by a hydrothermal method, cubic to XRD, appears to have lower symmetry to Raman spectroscopy, with unit-cell distortions similar to those of tetragonal ferroelectric B…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR Study of the Tautomerism of Porphyrin Including the Kinetic HH/HD/DD Isotope Effects in the Liquid and the Solid StateJuergen Braun, Martin Koecher, Martin Schlabach, Bernd Wehrle, Han-Heinrich Limbach, and Emanuel VogelCite this: J. Am. Chem. Soc. 1994, 116, 15, 6593–66…
Superhard materials are needed to replace diamond in applications at high temperatures, where diamond is unstable. Novel carbon‐ and boron‐based materials are described whose discovery or postulation has greatly stimulated research in this area. The use of calculations to predict the properties of new materials is ill…
Neutron-diffraction experiments and polarization analysis techniques reveal that the metal-insulator transition in the orthorhombic perovskites ${\mathrm{PrNiO}}_{3}$ and ${\mathrm{NdNiO}}_{3}$ is accompanied by a sudden three-dimensional magnetic ordering of the Ni sites (${\mathrm{\ensuremath{\mu}}}_{\mathrm{Ni}}$\e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiodegradable Plastic Made from Soybean Products. 1. Effect of Preparation and Processing on Mechanical Properties and Water AbsorptionInke Paetau, Chin-Zue Chen, and Jay-lin JaneCite this: Ind. Eng. Chem. Res. 1994, 33, 7, 1821–1827Publication Date (Print):July 1, 1994Publi…
Tetragonal La-modified lead zirconate titanate (PLZT) ceramics (Zr/Ti=40/60) with La-contents of 8, 12, and 15at.% have been studied using dielectric spectroscopy, X-ray diffraction, and hot-stage transmission electron microscopy (TEM). Increasing La-content drives the lead zirconate titanate from near conventional fe…
Forward biasing of transparent nanocrystalline TiO 2 (anatase) films in lithium ion‐containing organic electrolytes leads to rapid and reversible coloration due to electron accumulation and Li + intercalation in the anatase lattice. Absorption of >90% light throughout the visible and near IR can be switched on and off…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of an Organosilicon Dendrimer Containing 324 Si-H BondsDietmar Seyferth, David Y. Son, Arnold L. Rheingold, and Robert L. OstranderCite this: Organometallics 1994, 13, 7, 2682–2690Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Pu…
Measurements of the complex dielectric permittivity in nominally pure ${\mathrm{SrTiO}}_{3}$ are reported for frequencies ${10}^{\mathrm{\ensuremath{-}}3}$ Hz\ensuremath{\le}\ensuremath{\nu}\ensuremath{\le}${10}^{8}$ Hz and temperatures 0.1 K\ensuremath{\le}T\ensuremath{\le}300 K. The experiments reveal relaxation phe…
In part I, the concept of a temperature dependent domain stability map was developed for tetragonal ferroelectrics grown on cubic substrates. In this paper, a range of experimental data on domain populations in heteroepitaxial ferroelectric films is placed in the context of the stability map. Experimental data shows t…