Materials Literature
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It is currently possible to grow nearly perfect strained-layer semiconductor heterostructures. Experimental evidence shows that misfit dislocation sources become active almost immediately as the layer thickness exceeds the equilibrium critical thickness. These dislocation sources do not seem related to obvious causes,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface and bulk structure of segmented poly(ether urethanes) with perfluoro chain extenders. 3. Effects of annealing, casting solvent, and casting conditionsSung Chul Yoon and Buddy D. RatnerCite this: Macromolecules 1988, 21, 8, 2401–2404Publication Date (Print):August 1,…
The usefulness of liquid crystals in many applications relies on the possibility to induce structural changes by an externally applied agent, e.g. an electric field. The dynamical behaviour of the related switching processes may often be described by introducing a suitable viscosity term in the equation of motion. Vis…
The phase chemistries and microstructures of titanate‐based ceramics containing simulated high‐level nuclear waste with varying sodium contents were compared. Incorporation of relatively low sodium levels (∼0.9 wt% Na 2 O) resulted in more complex phase assemblages. The principal hosts for sodium were hibonite and fre…
Summary Soluble proteins and Ca and P salts in the fouling deposit on a mineral microfiltration membrane obtained in static conditions were analysed and compared with those found using dynamic filter conditions in a laboratory pilot installation for milk processing. The serum milk proteins were retained by the porous…
The objective of this study is to alter the fiber morphology of a linear aliphatic polyester, polyglycolic acid, by annealing treatment and to examine the changes of its degradation properties. The annealing was done at 150 degrees C, 170 degrees C, and 190 degrees C, and the specimens were annealed in four different…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of the nickel(I) octaethylisobacteriochlorin anion with alkyl halidesAlan M. Stolzenberg and Matthew T. StershicCite this: J. Am. Chem. Soc. 1988, 110, 16, 5397–5403Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCylindrical versus spherical micelle formation in block copolymer/homopolymer blendsAnne M. Mayes and Monica Olvera de la CruzCite this: Macromolecules 1988, 21, 8, 2543–2547Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published inissu…
Analogs 1-8 of diaminopimelic acid (DAP) were synthesized and tested for inhibition of purified meso-DAP D-dehydrogenase from Bacillus sphaericus and of LL-DAP epimerase from Escherichia coli. The dehydrogenase was assayed by monitoring NADPH formation spectrophotometrically at 340 nm. N-Hydroxy DAP 4, N-amino DAP 5,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomogeneous catalytic photochemical functionalization of alkanes by .alpha.-dodecatungstophosphate. Rate behavior, energetics, and general characteristics of the processesRoman F. Renneke and Craig L. HillCite this: J. Am. Chem. Soc. 1988, 110, 16, 5461–5470Publication Date…
Abstract The sintering of montmorillonites pillared by hydroxy-Al species was investigated by several techniques. The change of the microporosity of the pillared interlayer clay with temperature shows that sintering was mainly due to the loss of microporosity. On calcination of the parent clay at 760°C, the X-ray powd…
A monochromatic waveguide model that can predict the optical microscope images of line objects with arbitrary edge geometry is presented. The lines may be patterned in thick layers, including multilayer structures with sloping, curved, and undercut edges; granular structures such as lines patterned in polysilicon; and…
The ferroelectric properties in a chiral-racemic system of a liquid crystal with high spontaneous polarization are investigated by studying the spontaneous polarization in the SmC*-phase, the dielectric permittivity and the field induced tilt angle in the SmA-phase, and the SmC*-SmA transition temperature as a functio…
Cristallisation dans Icmm ou Icm2 avec affinement respectivement jusqu'a 0,109 et 0,058. Calcination a 873 K puis deshydratation a 573 K. Pour la structure Icmm, aucun ordre entre atomes P et Al. Pour la structure Icm2, alternance entre atomes, Al et P aux nœuds des tetraedres. Existence de composes non cristallins co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompressional modulus of swollen polyacrylamide networksErik Geissler, Anne Marie Hecht, Ferenc Horkay, and Miklos ZrinyiCite this: Macromolecules 1988, 21, 8, 2594–2599Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published inissue 1 A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnzymic regioselectivity in the hydroxylation of cholesterol catalyzed by a membrane-spanning metalloporphyrinJohn T. Groves and Ronny NeumannCite this: J. Org. Chem. 1988, 53, 16, 3891–3893Publication Date (Print):August 1, 1988Publication History Published online1 May 2002…
Yttria-stabilized zirconia (YSZ) films have been grown on Si(100) substrates heated at 800°C by vacuum evaporation. X-ray diffraction and reflection high-energy electron diffraction observations reveal the heteroepitaxial growth of cubic YSZ (200) films on Si(100) substrates. The reflection high-energy electron diffra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of high melting crystal in a thermotropic aromatic copolyesterY. G. Lin and H. H. WinterCite this: Macromolecules 1988, 21, 8, 2439–2443Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published inissue 1 August 1988https://pubs.…
The initial stage of oxidation of anodized porous silicon (PS) at low temperature (\lesssim208°C) has been investigated using a conventional infrared (IR) spectroscopy technique. After the oxidation in air, four extra IR absorption peaks appeared in the Si-H stretching band (2000∼2300 cm -1 ). The origins of these pea…
We have previously described and characterized a nuclear protein at 40 kDa/pI 5 termed "numatrin" which is tightly bound to the nuclear matrix. We demonstrated that a rapid increase in the synthesis of numatrin at early G1 phase is closely correlated with receptor-mediated induction of cellular proliferation by variou…