Materials Literature
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In recent years development in the field of immunologic assays has been characterized by an expanding use of monoclonal antibodies [1] and two-site ‘sandwich’ type assays [2]. Concomitantly, the assay sensitivities and specificities have improved considerably, which has opened new possibilities and areas of applicatio…
Autophosphorylation of Ca2+/calmodulin-dependent protein kinase II converts the enzyme to a Ca2+-independent form. The time course for this conversion correlates with the autophosphorylation of a threonine residue located within a thermolytic phosphopeptide common to the alpha and beta/beta' subunits. In the present s…
A thermodynamically stable quasi-crystalline single phase with an icosahedral structure was found to be formed at atomic compositions of Al 65 Cu 20 Ru 15 and Al 65 Cu 20 Os 15 in conventionally solidified and fully annealed states as well as in a rapidly solidified state. The quasi-crystalline nature determined by X-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAromatic-aromatic interactions in molecular recognition: a family of artificial receptors for thymine that shows both face-to-face and edge-to-face orientationsAlexander V. Muehldorf, Donna. Van Engen, John C. Warner, and Andrew D. HamiltonCite this: J. Am. Chem. Soc. 1988,…
Using site-directed mutagenesis we have created an altered calmodulin in which Gln-3 and Thr-146 have both been replaced by cysteines. We have reacted this protein with the bifunctional reagent, bismaleimidohexane, forming an intramolecular cross-link between the two cysteines. In the crystal structure of native calmo…
Recent aging studies performed on dilute and concentrated metal tritides are reviewed. Also, new results concerning property changes in metal tritides as a function of aging time are included. We mainly report on TEM studies of aged tritides, the swelling behavior, hardness measurements, selected mechanical properties…
Abstract Thiolate-bridged dinuclear cobalt(II), iron(II), and Manganese(II) complexes and trinuclear manganese(II) complexes of thiolic ligands, 2-[(2-aminoethyl)amino]ethanethiol, 2-[(3-aminopropyl)amino]ethanethiol, 2-[(2-pyridylmethyl)amino]ethanethiol, and 2-[[(2-pyridylethyl]amino]ethanethiol, were prepared and t…
Abstract Gum compounds of natural rubber (NR) and styrene‐butadiene rubber (SBR) are vulcanized at different temperatures and the cure characteristics and vulcanizate properties are compared. The optimum cure time at a particular vulcanization temperature could be expressed empirically in terms of that temperature usi…
Abstract High density polyethylene has been chlorinated by three different methods: in suspension and in solutions of two different solvents. Carbon‐13 NMR and infrared analysis show that chlorination in chlorobenzene solution leads to statistically random distribution while chlorination in suspension gives highly blo…
The subject of fabric primary handle evaluation is discussed in this paper. Some problems existing in Kawabata's system for primary hand values are revealed, which are considered inevitable in an approach involving subjective sensory assessment. Based on the same theory introduced in Part I, a new proposal for the obj…
The synergism between hydrogen embrittlement and temper embrittlement has been investigated in a 9Cr–1Mo martensitic steel. Measurements of tensile ductility were used to monitor the development of embrittlement with increasing hydrogen content in material as tempered and aged for up to 5000 h at 500 or 550°C. A detai…
Relationships among the apical pore jeld-bearing diatom genera Brebissonia, Cymbella, Gomphonema, Gomphoneis, Didymosphenia, Gomphocymbella, and Reimeria and their close ally Encyonema were evaluated using cladistics.These biraphid genera are a polythetic group dejned by chloroplast number and type, mode of sexual rep…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface plasmon polariton enhancement of Raman scattering in a Kretschmann geometryJ. Giergiel, C. E. Reed, J. C. Hemminger, and S. UshiodaCite this: J. Phys. Chem. 1988, 92, 19, 5357–5365Publication Date (Print):September 1, 1988Publication History Published online1 May 200…
Analytical results are obtained for mobility functions which describe the hydrodynamic interactions between two unequal viscous drops. It is assumed that the surface tension is sufficiently high so that the drops retain a spherical shape. Exact solutions are introduced for the velocity images for Stokeslets and higher…
The selective pretilting of the C-directors at the bounding surfaces, which causes characteristic disclination loops during the switching process, has been ascribed to the chevron structure of smectic layers. A zig-zag defect is the boundary between the two possible layer bend directions. By applying an electric field…
The values of buildup factors for a specific energy above K edges and penetration distance vary smoothly with respect to atomic number. An interpolation of buildup factors for an arbitrary elemental material is examined using geometric-progression (G-P) parameters for an equivalent atomic number. The G-P parameters ar…
Abstract Blends of bisphenol‐ A polycarbonate (PC) with poly‐ (styrene‐co‐acrylonitrile) (SAN) and poly (acrylonitrile‐butadiene‐styrene) (ABS) prepared by screw extrusion and solution‐casting were investigated by differential scanning calorimetry and scanning electron microscopy. From the measured glass‐transition te…
Symmetrical and cyclic alkyl trithiocarbonates were synthesized by reacting CS2 and 33% aqueous NaOH with alkyl hal-ides under phase transfer catalysis conditions
Lead metaphosphate glass is characteristically prone to aqueous attack but becomes chemically resistant on the addition of iron oxide. We have measured the K-edge extended X-ray absorption fine structure (EXAFS) of Fe and the LIII-edge EXAFS of Pb and find the atomic environments of the two sites to be very different.…
The corrosion potential of stressed sensitized Type 304 stainless steel has been studied in solutions containing oxygen to determine the relation between potential fluctuations and the initiation of stress corrosion cracking. An in situ scanning vibrating electrode technique was shown to detect currents coming from gr…