Materials Literature
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The structure of E. coli adenylate kinase with bound AMP and AMPPNP at 2.0 A resolution is presented. The protein crystallizes in space group C2 with two molecules in the asymmetric unit, and has been refined to an R factor of 20.1% and an Rfree of 31.6%. In the present structure, the protein is in the closed (globula…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the Self-Adhesion Hysteresis of a Siloxane Elastomer Using the JKR MethodPascal Silberzan, Susanne Perutz, Edward J. Kramer, and Manoj K. ChaudhuryCite this: Langmuir 1994, 10, 7, 2466–2470Publication Date (Print):July 1, 1994Publication History Published online1 Ma…
To solve or prevent copper pitting problems, it is first necessary to achieve a clearer understanding of copper corrosion theory, parts of which are currently not supported by practical experience. Some current theories of copper pitting are contradicted by practical experience. Although it has been theorized that chl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Investigation of Star Polymers in Solution by Small-Angle Neutron ScatteringL. Willner, O. Jucknischke, D. Richter, J. Roovers, L.-L. Zhou, P. M. Toporowski, L. J. Fetters, J. S. Huang, M. Y. Lin, and N. HadjichristidisCite this: Macromolecules 1994, 27, 14, 3821–…
Molecular dynamics (MD) simulation has been used to study chain dynamics in bulk polyethylene over a wide range of temperature. This range includes the volumetric glass transition. The latter was determined from the volume temperature relation established via constant pressure MD runs. Conformational transition rates…
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…