Materials Literature
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The biosynthesis of type I, type V and type VI collagens was studied by incubation of calf corneas in vitro with [3H]proline as a marker. Pepsin-solubilized collagen types were isolated by salt fractionation and quantified by SDS/PAGE. Expressed as proportions of the total hydroxyproline solubilized, corneal stroma co…
The apoprotein of glucose oxidase from Aspergillus niger was reconstituted with specifically 15N- and 13C-enriched FAD derivatives and investigated by 15N- and 13C-NMR spectroscopy. On the basis of the 15N-NMR results it is suggested that, in the oxidized state of glucose oxidase, hydrogen bonds are formed to the N(3)…
Abstract The angular dependence is investigated of the X‐ray absorption spectrum of TiK edge in TiO 2 recorded in the total electron yield mode. Despite the weak distortion of the octahedral coordination, the absorption spectra exhibit wide contrast which enables designation of the excited state orbitals involved in t…
Novel and reliable methods for the synthesis of the polymers [Cu(4-Xpz) 2 ] x (where X = H, Cl, Br, and Me; pz = pyrazolate) are presented. The X = Cl compound was obtained as green and brown forms. Single crystals of the polymers with X = Me and X = Cl (green form) suitable for X-ray analysis have been obtained. [Cu(…
Abstract Ring‐opening polymerization of 2‐methyl‐2‐oxazoline followed by termination with 3‐aminopropyltriethoxysilane produced poly(N‐acetylethylenimine) (polyoxazoline) (POZO) having a terminal triethoxysilyl group. Triethoxysilyl‐terminated telechelic POZO was also prepared by using bifunctional initiators. These s…
ZnO:Li films have been prepared by radio frequency (rf) diode sputtering using a Li-doped ZnO target. The film depositions were performed in pure Ar or in 28% O2/Ar sputtering gas. For comparison undoped ZnO films were also prepared. Structural, electrical, and optical measurements have been performed on films prepare…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal and catalytic polymerization of diethynyldiphenylsilaneThomas J. Barton, Sina Ijadi-Maghsoodi, and Yi PangCite this: Macromolecules 1991, 24, 6, 1257–1260Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Published inissue 1 March 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrins-cyclodextrin. 1. Photooxidation of zinc tetrakis(4-sulfonatophenyl)porphyrin (ZnTSPP) in cyclodextrin cavities: the characterization of ZnTSPP dication. Photolysis, radiolysis, and NMR studiesS. Mosseri, J. C. Mialocq, B. Perly, and P. HambrightCite this: J. Phys.…
Abstract A combination of electrochemical and microgravimetric techniques, utilizing the electrochemical quartz crystal microbalance (EQCM), has been employed to study the ion transport behavior of polypyrrole films, prepared with a variety of electrolytes, during redox switching. Systems investigated include poly(pyr…
The statistical nature of chemical polymerization processes ensures that the materials prepared by such methods will consist of mixtures of chains. In contrast, ribosomal catalysis of protein synthesis on messenger RNA templates affords homogeneous products in which chain length, sequence, and stereochemistry are subj…
Current density-voltage characteristics have been obtained from evaporated cobalt phthalocyanine thin Film sandwich structures using ohmic gold contacts, both before and after annealing. Results show that at low voltages the conduction process is ohmic, while at high voltages space-charge limited conduction is present…
Brillouin scattering in aqueous LiCl solutions was investigated in the concentration range 5--36 mol % at temperatures between 375 and 78 K. The polarized spectra were found to be accurately described by generalized hydrodynamics with a single-relaxation-time structural-relaxation process. The relaxation times obey th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRegioselectivities and stereoselectivities of singlet oxygen generated by cyclodextrin-sandwiched porphyrin sensitization. Lipoxygenase-like activityYasuhisa Kuroda, Takashi Sera, and Hisanobu OgoshiCite this: J. Am. Chem. Soc. 1991, 113, 7, 2793–2794Publication Date (Print)…
Abstract Non-symmetric diarylethenes with an indole ring on one end and a thiophene, a benzo[b]thiophene, or a pyrrole ring on the other end of the double bond were synthesized in an attempt to get thermally irreversible photochromic compounds having absorption bands at longer wavelengths. 2-(1,2-Dimethyl-3-indolyl)-3…
We consider a pseudoparabolic regularization of a forward-backward nonlinear diffusion equation ${u_t} = \Delta (f(u) + \nu {u_t})$, motivated by the problem of phase separation in a viscous binary mixture. The function $f$ is non-monotone, so there are discontinuous steady state solutions corresponding to arbitrary a…
High intensity ultrasound causes the formation of cavitation bubbles which collapse in a manner that, in the presence of a solid surface, form high velocity fluid microjets directed toward the surface. The intense fluid agitation at surfaces in a focused ultrasound field enhances transport of momentum, heat, and mass…
We develop a model for the phase transitions of a system of infinitely long, semiflexible chains that interact through a steric, excluded-volume repulsion. This model combines density-functional theory for freezing with the Onsager theory of orientational ordering. We derive phase diagrams in terms of pressure or dens…
We recently cloned and sequenced alpha 1 (VIII) collagen cDNAs and demonstrated that type VIII collagen is a short-chain collagen that contains both triple helical and carboxyl-terminal non-triple helical domains similar to those of type X collagen (Yamaguchi, N., Benya, P., van der Rest, M., and Ninomiya, Y. (1989) J…
The influence of exchangeable cations on montmorillonite, illite, and kaolinite and of lattice charge of montmorillonite on clay-humic acid complexation were studied with complexes which were subjected to drying. The amounts of humic acid (HA) nonextractable by water from the complexes (termed “fixed” humic acid) were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of hexakis(tert-butoxo)dialuminum. Comments on the extent of M-O .pi. bonding in Group 6 and Group 13 alkoxidesRoger H. Cayton, Malcolm H. Chisholm, Ernest R. Davidson, Vincent F. DiStasi, Ping Du, and John C. HuffmanCite this: Inorg. Chem. 19…