Materials Literature
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The synthesis and photoluminescence mechanism of are presented. Monitored at 450 nm, exhibits an absorption band at 245 nm; monitored at 506 nm exhibits absorption bands at 245 and 283 nm. Under 254 nm excitation exhibits a broad‐band emission extending from 360 to 610 nm, peaking at 450 nm. This emission is gradually…
Ultrasonically driven vibrating files are known to enhance the efficiency of root canal debridement. This paper presents a phenomenological view of the hydrodynamic response of an oscillating ultrasonic file and the relationship between the file response and various physical factors such as file size and curvature, fi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElementary Reaction Mechanism for Growth of Diamond (100) Surfaces from Methyl RadicalsSergei Skokov, Brian Weiner, and Michael FrenklachCite this: J. Phys. Chem. 1994, 98, 28, 7073–7082Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Publis…
Solid polymer electrolytes consisting of complexes of poly(ethylene oxide)‐grafted poly(methyl)‐methacrylate (PEO‐PMMA) and tetraalkylammonium salts [tetrabutylammonium perchlorate, tetraethylammonium perchlorate, and tetraethylammonium tetrafluoroborate (TEABF 4 )] have been investigated for electric double‐layer cap…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrophases of a Diblock Copolymer with Conformational AsymmetryM. W. Matsen and M. SchickCite this: Macromolecules 1994, 27, 14, 4014–4015Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July 1994https://pubs.acs.org/doi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Characterization, and Properties of High Molecular Weight Unsymmetrically Substituted Poly(ferrocenylsilanes)Daniel Foucher, Ralf Ziembinski, Ruth Petersen, John Pudelski, Mark Edwards, Yizeng Ni, Jason Massey, C. Raimund Jaeger, G. Julius Vancso, and Ian MannersC…
27 Al NMR spectra of CaO–Al 2 O 3 liquids at 2500 K have been obtained using a recently developed technique that involves CO 2 laser heating and sample levitation inside the NMR magnet. The spectra consist of single, narrow lines (100 to 200 Hz FWHM), indicating that rapid chemical exchange among molecular species occ…
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…