Materials Literature
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The structure and function of the xylose (glucose) isomerase from Actinoplanes missouriensis have been analyzed by X-ray crystallography and site-directed mutagenesis after cloning and overexpression in Escherichia coli. The crystal structure of wild-type enzyme has been refined to an R factor of 15.2% against diffrac…
The spreading of a drop of viscous fluid on a horizontal surface by capillarity has been studied by a number of authors. Different hypotheses have been advanced for the crucial questions of the contact angle at the moving rim of the drop. It is argued that there is one model that agrees with experiments and is economi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyimides derived from 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl. 2. Synthesis and characterization of polyimides prepared from fluorinated benzenetetracarboxylic dianhydridesTohru Matsuura, Maki Ishizawa, Yoshinori Hasuda, and Shiro NishiCite this: Macromolecules 1992…
Artificial substrata are increasingly used to study periphyton, but their ability to reproduce natural substrata remains controversial. Although many studies have made contemporaneous comparisons of periphyton assemblages on artificial and natural substrata at one or a few sites, no broadly based comparison exists. We…
Raman scattering of ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$ has been performed from room temperature to 1273 K to study structural changes as the glass transforms into the melt via the supercooled regime. It is found that a structural model containing threefold six-member planar boroxol rings and chains of ${\mathrm{BO}}…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNickel(II) ion-support interactions as a function of preparation method of silica-supported nickel materialsOlivier Clause, Maggy Kermarec, Laurent Bonneviot, Francois Villain, and Michel CheCite this: J. Am. Chem. Soc. 1992, 114, 12, 4709–4717Publication Date (Print):June 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLyotropic liquid crystalline hyperbranched aromatic polyamidesYoung H. KimCite this: J. Am. Chem. Soc. 1992, 114, 12, 4947–4948Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://pubs.acs.org/doi/10.1021/ja0…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and properties of poly(N-alkylanilines)Jean Wilbert Chevalier, Jean Yves Bergeron, and Le H. DaoCite this: Macromolecules 1992, 25, 13, 3325–3331Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal properties and orientational behavior of a liquid-crystalline ion complex polymerSeiji Ujiie and Kazuyoshi IimuraCite this: Macromolecules 1992, 25, 12, 3174–3178Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 Ju…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCylindrical micelles in rigid-flexible diblock copolymersD. R. M. Williams and G. H. FredricksonCite this: Macromolecules 1992, 25, 13, 3561–3568Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://doi.org/10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentacoordinate anionic bis(siliconates) containing a fluorine bridge between two silicon atoms. Synthesis, solid-state structures, and dynamic behavior in solutionKohei Tamao, Takashi Hayashi, Yoshihiko Ito, and Motoo ShiroCite this: Organometallics 1992, 11, 6, 2099–2114Pu…
A mathematical model is presented that investigates the diffusive reequilibratrion of chemical species in melt inclusions with external melt through the host crystal. Analytic solution of the differential equations reveals that reequilibration is easier (1) for species with higher diffusivities in the host crystal, (2…
The measurement of the saddle-splay surface elastic constant ${\mathit{K}}_{24}$ in a nematic liquid crystal is reported based on two independent deuterium nuclear-magnetic-resonance ${(}^{2}$H-NMR) experiments. Fifty years after the pioneering work of Oseen and Zocher, these measurements were made from observations o…
Optical-quality transparent conducting films of polyaniline (PANI) and of conducting polyblends of polyaniline with amorphous bulk polymers are described. Using functionalized protonic acids to induce solubility in common organic solvents, PANI and PANI polyblends can be cast from solution, in the conducting form, ont…
A high-precision solution structure of the elastase inhibitor eglin c was determined by NMR and distance geometry calculations. A large set of 947 nuclear Overhauser (NOE) distance constraints was identified, 417 of which were quantified from two-dimensional NOE spectra at short mixing times. In addition, a large numb…
Carbon thin films have been prepared by 248 nm excimer laser vaporization of graphite targets. The effect of a variety of process parameters on the film properties is investigated. Deposition at or below room temperature yields diamond-like films with low hydrogen content, high optical transmission, and high resistivi…