Materials Literature
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The preparation of a number of copper(II) complexes of β-diketones is described. Following the unexpected discovery of a smectic A phase in bis-[l-(4′-decylbiphenyl-4-yl)-3-(4′-fluorobiphenyi-4-yl)propane-l,3-dionato]copper(II), two series of novel copper(II) complexes were prepared; one series is based on l-biphenyl-…
Membrane-bound L-(+)-pantoyl lactone dehydrogenase, an enzyme that catalyzes the formation of ketopantoyl lactone from L-(+)-pantoyl lactone, was solubilized with Brij 35 and purified 78-fold to apparent homogeneity, with a 3.7% overall recovery, from Nocardia asteroides through purification procedures including succe…
The inhibition of the CO/H20/02 reaction by small quantities or HCl was studied in a high temperature, atmospheric pressure flow reactor at temperatures near 1000K. The initial species concentrations of the CO/H30/02; reaction bath were kept constant at about l%/0·6%/0·5% respectively, while the initial concentration…
Photosensitive polymer dispersed liquid crystals (PDLC) were prepared using the nematic mixture E-5 doped with 2 wt-% photochromic stilbene dye in a gelatin binder. The stilbene undergoes E-Z photoisomerization on irradiation. The change of the configuration of dopants perturbs the liquid-crystalline order and the cle…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of poly(3-hydroquinonylpyrrole)Allan B. Kon, J. S. Foos, and Timothy L. RoseCite this: Chem. Mater. 1992, 4, 2, 416–424Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March 1992https://pubs.acs.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical investigation of novel polymerizable thiophene/ferrocene conjugatesRoberta Back and R. Bruce LennoxCite this: Langmuir 1992, 8, 3, 959–964Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March 1992https:/…
Reaction‐bonded silicon nitride (RBSN) with little or no residual silicon was formed from laser‐synthesized silicon powders and N 2 , at low temperatures and in short times (<10 min at 1250°C, <1 h at 1150°C). The nitriding kinetics were studied with thermogravimetric analysis (TGA). Samples formed in the TGA fu…
The analysis of conformational transitions using limited proteolysis was carried out on a hyperthermophilic aspartate aminotransferase isolated from the archaebacterium Sulfolobus solfataricus, in comparison with pig cytosolic aspartate aminotransferase, a thoroughly studied mesophilic aminotransferase which shares ab…
We show that, due to the coupling between tilt (amplitude of the antisymmetric part of the font profile) and phase dynamics, the phenomenology of tilt domains of finite width proposed by Coullet et al. within the assumption of a subcritical homogeneous tilt bifurcation retains the same qualitative features when this b…
The analytic predictions from the Self-Consistent Field(SCF) theory for grafted polymer layers are compared in detail with the recent Monte Carlo simulations using the bond-fluctuation model. Quantities describing the equilibrium structure of the brush are derived from the SCF theory and compared with the Monte Carlo…
The extracellular elastase (33 kDa) of Pseudomonas aeruginosa is synthesized as a 53.6 kDa preproenzyme containing a long, N-terminal propeptide. The free propeptide and the elastase precursor generated upon propeptide removal were isolated from P. aeruginosa cells and subjected to N-terminal amino acid sequence analy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleStructure and chemistry of silicon nitride and silicon carbonitride thin films deposited from ethylsilazane in ammonia or hydrogenY. W. Bae, H. Du, B. Gallois, K. E. Gonsalves, and B. J. WilkensCite this: Chem. Mater. 1992, 4, 2, 478–483Publication Date (Print):March 1, 1992Publ…
In this paper we provide a detailed description of the interaction of solutal convection and morphological instability in the presence of a model boundary-layer flow. We present a detailed investigation of the structure of the marginal surfaces in Rayleigh-number, Sekerka-number, Reynolds-number space associated with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual phase behavior of some poly(dialkoxyphosphazenes)V. S. Papkov, M. N. Il'ina, V. P. Zhukov, D. Ya. Tsvankin, and D. R. TurCite this: Macromolecules 1992, 25, 7, 2033–2040Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRegulation of alignment of cyanobiphenyl liquid crystals by azobenzene molecular filmsKoso Aoki, Takashi Tamaki, Takahiro Seki, Yuji Kawanishi, and Kunihiro IchimuraCite this: Langmuir 1992, 8, 3, 1014–1017Publication Date (Print):March 1, 1992Publication History Published o…
Non‐oxide ceramics , for example aluminum nitride, silicon carbide, and silicon nitride, are ideal materials for applications under high thermal and mechanical stress. The synthetic methods including liquid‐phase sintering processes, the microstructures of the resulting materials (figure shows Si 3 N 4 from powder pro…
Abstract Poly(etherurethane) (PEU) and poly(etherurethaneurea) (Biomer®) films with and without antioxidant stabilizers were subcutaneously implanted into dogs and rats for up to 10 weeks. It was found that the molecular weight of the PEU films decreased over the 10‐week period, while the Biomer® films increased in mo…
Fasciclin I is a homophilic cell adhesion molecule in insects that is dynamically expressed on a subset of axon pathways in the embryonic nervous system, and on a variety of other cells and tissues during development. The fasciclin I protein consists of four homologous 150 amino acid domains. In this article, we descr…
The preparation and solid state characterization of the bifunctional radical furan-2,5-bis(1,2,3,5-dithiadiazolyl) 2,5-[(S 2 N 2 C)OC 4 H 2 (CN 2 S 2 )] and the related monofunctional radical 2-cyanofuran-5-(1,2,3,5-dithiadiazolyl) 2,5-[(S 2 N 2 C)OC 4 H 2 (CN)] are described. The crystal structure of 2,5-[(S 2 N 2 C)…
Abstract A novel process for the preparation of highly saturated nitrile rubber latex has been developed. This process directly converts NBR latex into HNBR latex in one reaction step. The key to the process is the efficient in-situ generation of diimide within the latex by the oxidation of hydrazine hydrate in the pr…