Materials Literature
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Two-component liquid crystalline (LC) mixtures containing LC diacrylates and chiral molecules with no reactive groups were made. Upon photopolymerisation of the mixtures, cholesteric networks containing up to 28% w/w chiral molecules which were not chemically attached to the networks were created. Temperature dependen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCyclynes. 9. Regioselective coupling of ethynylcyclopropane units: hexaspiro[2.0.2.4.2.0.2.4.2.0.2.4]triaconta-7,9,17,19,27,29-hexayneArmin De Meijere, Frank Jaekel, Arndt Simon, Horst Borrmann, Jurgen Koehler, Dan Johnels, and Lawrence T. ScottCite this: J. Am. Chem. Soc. 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced porphyrin-to-quinone electron transfer across oligospirocyclic spacersSpencer Knapp, T. G. Murali Dhar, Jennifer Albaneze, Steve Gentemann, Joseph A. Potenza, Dewey Holten, and Harvey J. SchugarCite this: J. Am. Chem. Soc. 1991, 113, 10, 4010–4013Publication Dat…
Fully agglomerated superfine zirconia powders were prepared with the coprecipitation and spray‐drying method. The compaction of such powders shows no fragmentation of the agglomerates. The sintering behavior of the compacts was studied and two sintering stages were identified: densification within agglomerates at temp…
Reaction of (tBu) 2 Si(OH) 2 with TiCl 4 , TiBr 4 , TiI 4 , and ZrCl 4 affords eight-membered rings 2a-2d. The X-ray structural analysis of 2a, 2b and 2d reveals in 2a and 2b tetrahedral and in 2d octahedral coordination at the transition metal atoms. The octahedral geometry in 2d is due to two additional coordinated…
The present study is a comparison of the properties of rare‐earth aluminogermanate and rare‐earth aluminosilicate glasses. Several properties have been measured, including density, transformation temperature, softening point, thermal expansion, Vickers hardness, magnetic susceptibility, Verdet constant, and IR transmi…
The hdc genes encoding the inducible pyridoxal-P-dependent histidine decarboxylase (HisDCase) of Klebsiella planticola and Enterobacter aerogenes were isolated, sequenced, and expressed in Escherichia coli under control of the lac promoter, and the overproduced enzymes were purified to homogeneity from the recombinant…
Electric polarizabilities, dipole and quadrupole moments of the molecules LiH, LiF, LiCl, NaH, NaF, NaCl, BeO, BeS, MgO, MgS, BeH, BeF, BeCl, MgH, MgF, MgCl, LiO, LiS, NaO and NaS are computed in a uniform basis at the correlated level of theory. The results are rationalized in terms of the properties of ion pairs, an…
Mechanical alloying of a mixture of Ag and Fe powders, with initial grain size of about 100 µm, has been performed. Metallography in atomic scale, by the use of a high resolution electron microscopy, reveals the nanometer-sized crystalline structure in a Ag-50 at%Fe alloy. The 57 Fe Mössbauer spectroscopy confirms the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal-amorphous interphases in binary polymer blendsJames P. Runt, Catherine A. Barron, Xiu Fang Zhang, and Sanat K. KumarCite this: Macromolecules 1991, 24, 11, 3466–3468Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1…
The use of the boundary element technique in the computation of the potential distribution within isotropic inhomogeneous volume conductors of arbitrary shape set up by current injected through surface electrodes is presented. The derived algorithm is validated by comparing its solution to analytical solutions in the…
Semimembranosus muscle samples were obtained from 49 Holstein beef animals representing different USDA maturities. Intramuscular collagen (IMC) was isolated in the frozen state and evaluated for heat-labile collagen solubility (% Sol), thermal shrinkage temperature (Ts), enthalpy (Hs) changes, and mature crosslink (py…
When a suspension of small particles is overlain by a clear fluid whose density is greater than that of the interstitial fluid, but less than that of the bulk suspension, the settling of the dense suspended particles can lead to vigorous convection in the overlying fluid. This novel situation is investigated experimen…
We study the linear viscoelasticity of semidilute suspensions of spherical Brownian particles. We consider a simple model in which hydrodynamic interactions and direct interactions apart from hard-sphere repulsion are neglected. We calculate the dynamic viscosity for this model system exactly to second order in the vo…
Type I procollagen was purified from cultured fibroblasts of a proband with a lethal variant of osteogenesis imperfecta. The protein was a mixture of normal procollagen and mutated procollagens containing a substitution of cysteine for glycine in either one pro alpha 1(I) chain or both pro alpha 1(I) chains, some or a…
Nonlinear internal friction measurements have been carried out on La-modified lead zirconate titanate relaxors with a Zr/Ti ratio of 65/35. Measurements have been made as a function of La content and dc bias. The elastic softening is believed to have a ferroelastic contribution due to the tilting of the oxygen octahed…
A detailed experimental investigation of the electrical behavior of the silicon‐electrolyte interface is presented, which leads to the conclusion that electrochemical dissolution of p‐type silicon (doping range ) during porous silicon formation is mainly determined by the charge exchange at the silicon surface over th…
We developed a canine model for the in vivo utilization of angiogenesis factors to promote revascularization of a collateral-dependent area of the heart and assessed the potential of heparin in this preparation. Ameroids were placed on the proximal left anterior descending coronary artery (LAD) of 29 dogs, and the lef…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacrocyclic polyamino polythiaether ligands with NxS4-x and NxS5-x donor sets: protonation constants, stability constants, and kinetics of complex formation with the aquocopper(II) ionBryan C. Westerby, Kerri L. Juntunen, Gregory H. Leggett, Virginia B. Pett, Michael J. Koen…
A novel codeposition process has been developed for the fabrication of inhomogeneous optical coatings. These single-layer coatings exhibit composition and refractive index that vary continuously with thickness. Two types of inhomogeneous optical filters for antireflection and narrow band rejection applications, respec…