Materials Literature
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The history and characteristics of the genus Craticula are reviewed, to justify its separation from Navicula and from the Naviculaceae. Members of the genus have previously been put in Navicula sect. Orthostichae; they include such species as those formerly known as Navicula cuspidata, N. ambigua, N. perrotettii and N…
Structure measurements of a suspension of charged polystyrene spheres with significant polydispersity (16%) are reported for a wide range of particle and added salt concentrations and scattering wave vector. Small angle neutron scattering yielded the structure factors of concentrated samples that have had extensive rh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of potential on metal-adsorbate structure: solvent-independent nature of infrared spectra for platinum(111) carbon monoxideSi Chung Chang, Xudong Jiang, Joseph D. Roth, and Michael J. WeaverCite this: J. Phys. Chem. 1991, 95, 14, 5378–5382Publication Date (Print):J…
p-Aminobenzoate, a component of the vitamin folate, is one of seven compounds derived from the aromatic precursor chorismate in Escherichia coli. Historically the gene products of pabA and pabB were assumed to be sufficient for de novo p-aminobenzoate biosynthesis. Recent studies, however, have shown that these protei…
The influence of stress ratio on the tensile fatigue behavior of a unidirectional SiC‐fiber/Si 3 N 4 ‐matrix composite was investigated at 1200°C. Tensile stress ratios of 0.1, 0.3, and 0.5 were examined. Fatigue testing was conducted in air, at a sinusoidal loading frequency of 10 Hz. For peak fatigue stresses below…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of iodoethane, iodopropane, 2-iodopropane, chloroiodomethane adsorbed on silver(111)X. L. Zhou and J. M. WhiteCite this: J. Phys. Chem. 1991, 95, 14, 5575–5580Publication Date (Print):July 1, 1991Publication History Published online1 May 2002Published inissue 1 Jul…
Transparent ferroelectric strontium barium niobate (SBN) thin films were made on fused silica, silicon, and GaAs substrates by the sol-gel process. The microstructure of these thin films was studied. Preferentially oriented SBN thin films on fused silica substrates can be obtained by applying a dc electric field durin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence from the chair and cube isomers of tetrakis[(triphenylphosphine)iodosilver]Maher Henary and Jeffrey I. ZinkCite this: Inorg. Chem. 1991, 30, 15, 3111–3112Publication Date (Print):July 1, 1991Publication History Published online1 May 2002Published inissue 1 July…
Abstract The Selectivity of trifluoroacetic anhydride (TFAA), used for the vapor‐phase derivatization of hydroxyl groups in multifunctional oxygen‐containing polymeric surfaces, has been investigated by XPS studies on model epoxides systems. The reactivity of TFAA towards epoxides observed here is discussed in the con…
The genes (slgA) encoding the surface-layer glycoproteins of the hyperthermophilic methanogens Methano-thermus pervidus and Methanothermus sociabilis were cloned and sequenced. The nucleotide sequences of these genes differ at only nine positions, resulting in three amino acid differences. In both organisms, the trans…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrocatalytic oxidation of methanol by assemblies of platinum/tin catalyst particles in a conducting polyaniline matrixChristopher T. Hable and Mark S. WrightonCite this: Langmuir 1991, 7, 7, 1305–1309Publication Date (Print):July 1, 1991Publication History Published onli…
We summarize the experimental results observed in the ferrielectric smectic liquid crystalline phase of MHPOBC by such as DSC, dielectric, X-ray, conoscope, rotatory power and electro-optic measurements. By using the newly obtained information for the pitch in this phase, we propose a novel structure of the ferrielect…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHaloaldehyde polymers. 51. Helix-sense reversal of isotactic chloral oligomers in solutionKoichi Ute, Katsuo Hirose, Hiroaki Kashimoto, Koichi Hatada, and Otto VoglCite this: J. Am. Chem. Soc. 1991, 113, 16, 6305–6306Publication Date (Print):July 1, 1991Publication History P…
The three-dimensional structure of the complex of ribulose-1,5-bisphosphate carboxylase from Rhodospirillum rubrum, CO2, Mg2+, and ribulose bisphosphate has been determined with x-ray crystallographic methods to 2.6-A resolution. Ribulose-1,5-bisphosphate binds across the active site with the two phosphate groups in t…
In recent years we have prepared a large number of mono-fluoro- and ortho-difluoro-substituted 4,4″-dialkyl- and 4,4″-alkoxyalkyl-terphenyls. The synthesis and transition temperatures of a variety of related difluoro compounds is presented here so that it is now possible to identify (i) broadening of the molecule, (ii…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSteric separation of nucleophile and Lewis acid providing dramatically accelerated reaction. High-speed polymerization of methyl methacrylate with enolate-aluminum porphyrin/sterically crowded organoaluminum systemsMasakatsu Kuroki, Tsuyoshi Watanabe, Takuzo Aida, and Shohei…
This paper reports for the first time X-ray crystal structures for a parent heteropoly complex and for its heteropoly blue reduction product. The potassium salt of the former complex, α-[CoIIW12O40]6-, is ordered in space group P6,22; and the potassium salt of its two-electron heteropoly blue reduction product, α-[CoI…
Characterization of Conductive Polymeric Nickel(II) Tetrakis(3‐methoxy‐4‐hydroxy‐phenyl)Porphyrin as an Anodic Material for Electrocatalysis, Malinski, Tadeusz, Ciszewski, Aleksander, Bennett, Janet, Fish, Judith R., Czuchajowski, Leszek
We study transitions to periodic structures in diblock copolymer melts including self-consistently the concentration fluctuations, and expanding the density in multiple harmonics. The fluctuations induce a shift in the maximum scattering wave vector in the isotropic state which suggests that the chains stretch near th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology and structure of conducting polymersS. P. Armes, M. Aldissi, M. Hawley, J. G. Beery, and S. GottesfeldCite this: Langmuir 1991, 7, 7, 1447–1452Publication Date (Print):July 1, 1991Publication History Published online1 May 2002Published inissue 1 July 1991https://p…