Materials Literature
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The intensity of the tryptophan fluorescence of the alpha subunits of guanine nucleotide-binding regulatory proteins increases when they bind guanosine 5'-O-(3-thio)triphosphate (GTY gamma S). The kinetics of the fluorescence enhancement and of the measured binding of [35S]GTP gamma S are well correlated. The addition…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetism of manganese(II)copper(II) and nickel(II)copper(II) ordered bimetallic chains. Crystal structure of MnCu(pba)(H2O)3.2H2O (pba = 1,3-propylenebis(oxamato))Yu Pei, Michel Verdaguer, Olivier Kahn, Jorunn Sletten, and Jean Pierre RenardCite this: Inorg. Chem. 1987, 26,…
Polyacetylene is presented both as a prototype conducting polymer and as a prototype one-dimensional metal and semiconductor. The concepts of the physics of one-dimensional metals are demonstrated on idealized polyacetylene. A review of the chemical and physical properties of real polyacetylene is given and experiment…
Barium titanate shows discontinuous grain growth in the presence of small amounts of the liquid eutectic Ba 6 Ti 17 O 40 ‐BaTiO 3 at T > 1312°C. The exaggerated grain growth in the presence of the liquid phase can be explained in terms of a solution‐segregation process. The grain size distribution of sintered BaTiO…
Journal URL: http://www.societyofglasstechnology.org.uk/cgi-bin/open.cgi?page=%20PC/PC-00a&sessionid=85597106; http://www.societyofglasstechnology.org.uk/cgi-bin/open.cgi?page=journal&sessionid=85597106
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal characterization of poly(acrylic acid)J. J. Maurer, D. J. Eustace, and C. T. RatcliffeCite this: Macromolecules 1987, 20, 1, 196–202Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published inissue 1 January 1987https://pubs.acs.…
The structures of roller‐quenched SiO 2 ‐Al 2 O 3 glasses containing 10 to 50 wt% Al 2 O 3 were investigated by TEM and high‐resolution 27 Al and 29 Si magic angle sample spinning nuclear magnetic resonance (MASS‐NMR) spectroscopy. The chemical shifts observed in the NMR spectra of these phase‐separated (on the TEM sc…
The potential of superparamagnetic ferrite particles as a contrast agent for magnetic resonance (MR) imaging was studied by in vitro MR spectroscopy and in vivo MR imaging in laboratory animals. After aqueous preparations of ferrite particles were administered intravenously, MR spectroscopy showed greatly decreased T2…
The relaxation of excited molecular states is often followed by the emission of light. Molecular excited states are related to the orbital, vibrational, and rotational levels of the orbital electrons. In addition, the electron spin determines the singlet and triplet states. In the singlet state the spin of an electron…
A stochastic random network model is proposed for the structure of ${\mathrm{Ge}}_{\mathrm{x}}$${\mathrm{S}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$, ${\mathrm{Ge}}_{\mathrm{x}}$${\mathrm{Se}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$, ${\mathrm{Si}}_{\mathrm{x}}$${\mathrm{S}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$, and ${\m…
Boron-rich molecules and solids hold a special place within chemistry. They do not follow the general bonding rules we are taught in chemistry classes. For example, some boron-rich solids are composed of 12-atom clusters of boron atoms in which each boron atom resides on a vertex of an icosahedron. These solids are ve…
Thick, 3–14 mil, free‐standing polypyrrole films incorporating a large variety of anion "dopants" were anodically deposited from aqueous electrolytes. Four‐point probe conductivity and x‐ray diffraction measurements were made and compared. Aromatic and very large amphiphilic sulfonate dopants provided the highest cond…
The renormalization approach to the roughening transition is reconsidered, both in a static and in a dynamic picture. Earlier results based on an asymptotic approximation are corrected, especially as regards the interface mobility. For a tilted interface, or in the presence of an applied force F, a new length scale ap…
Aspartic proteases (EC3.4.23) are a group of proteolytic enzymes of the pepsin family that share the same catalytic apparatus and usually function in acid solutions. This latter aspect limits the function of aspartic proteases to some specific locations in different organisms; thus the occurrence of aspartic proteases…
Revue bibliographique concernant les proprietes physiques, chimiques et moleculaires des emulsions alimentaires, en particulier dans le cas de liqueurs a la creme, de solutions de proteines, de boissons rafraichissantes et autres
We have observed a darkening effect and the formation of permanent volume gratings in CdSSe semiconductor-doped glasses, both phenomena being certainly due to the same photochemical mechanism. This allowed us to reconcile contradictory results concerning the speed of their nonlinear response. We also studied the frequ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLattice models of branched polymers: combs and brushesJ. E. G. Lipson, D. S. Gaunt, M. K. Wilkinson, and S. G. WhittingtonCite this: Macromolecules 1987, 20, 1, 186–190Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published inissue 1 J…
Polypyrrole incorporating an anionic polymer dopant was used as the anode of a polymer battery utilizing its pseudo-cathodic doping process.
A system close to a bulk phase transition presents peculiar response to external boundaries, a single wall may induce the presence of wetting layers, with the appearance of a surface phase transition and critical point. The confinement of the system between the two parallel walls or cylindrical tube, produces a shift…
High molecular weight, free-standing films of poly(2,5-thienylene vinylene) are readily prepared via a soluble precursor polymer and reach conductivities as high as 62 S cm–1 on doping.