Materials Literature
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The effect of a cryoprotectant (glycerol) upon the mosaicity of flash-frozen T-state glycogen phosphorylase b crystals has been investigated. Glycerol concentration in a buffered solution was varied between 0 and 70% v/v. The results show that there is a well defined optimum in glycerol concentration giving lowest mos…
The brittle‐to‐ductile transition (BDT) of Precracked sapphire in four‐point bending was studied as a function of orientation and strain rate from room temperature to 1500°C. Plastic deformatiom of sapphire occurs via basal and prismatic slip during loading at high temperature (above 1030–1100°C, depending on orientat…
It is well established that, within families of homologous enzymes, amino acid residues that are involved in the chemistry of the reaction are highly conserved. To determine if residues at the subunit interface of oligomeric enzymes with shared active sites are also conserved, comparative analysis of five enzyme famil…
Abstract Two new phenylethynyl endcapping compounds, 3‐ and 4‐amino‐4′‐phenylethynylbenzophenone, were synthesized and used to terminate imide oligomers from 3,4′‐oxydianiline and 4,4′‐oxydiphthalic anhydride at a calculated molecular weight of 9000 g/mol and from 3,4′‐oxydianiline (0.85 mol), 1,3‐bis (3‐aminophenoxy)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction Kinetics of Epoxy/Amine Model Systems. The Effect of Electrophilicity of Amine MoleculeJovan Mijovic and Jony WijayaCite this: Macromolecules 1994, 27, 26, 7589–7600Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inis…
A simple method for the preparation of isomorphous xenon derivatives is presented. A device has been designed that allows diffraction studies on protein crystals under xenon gas pressures up to 50 × 105 Pa. Crystal mounting and X-ray data collection do not significantly differ from standard techniques. Tests carried o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAttractive Inter- and Intramolecular N.cntdot..cntdot..cntdot.O Interactions in N,N-Dipicrylamine and Its Ionic ComplexesKrzysztof Wozniak, Heyong He, Jacek Klinowski, William Jones, and Eugeniusz GrechCite this: J. Phys. Chem. 1994, 98, 51, 13755–13765Publication Date (Prin…
Abstract An apparatus is described to measure interfacial tension for molten polymer pairs. The apparatus is based on the pendant drop method. A CCD color video camera captures the image of a pendant drop profile, which is analyzed on‐line using a microcomputer. These almost continuous measurements permit the detectio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplementary Shapes in Columnar Liquid Crystals: Structural Control in Homo- and Heteronuclear Bimetallic AssembliesAndre G. Serrette, Chung K. Lai, and Timothy M. SwagerCite this: Chem. Mater. 1994, 6, 12, 2252–2268Publication Date (Print):December 1, 1994Publication Histo…
The low-valent titanium induced reductive coupling of metal(II) 5-formyl-octaethylporphyrin (OEP) (2, 3) leads to the formation of ethene-bridged bisporphyrins. Structural studies on the main products of the coupling of Cu(II) (2) and Ni(II) 5-formyl-OEP (3) revealed, surprisingly, the formation of the cis-isomers 1,2…
Abstract A non‐invasive γ‐ray emission system, employing eight NaI detectors, has been developed to follow the motion of a single radioactive particle in a three‐dimensional spouted bed reactor. The count‐rates measured simultaneously by the detectors are converted into tracer coordinates (x, y, z) using a pre‐establi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb Initio Studies of Neutral and Protonated Triglycines: Comparison of Calculated and Experimental Gas-Phase BasicityKui Zhang, Carolyn J. Cassady, and Alice Chung-PhillipsCite this: J. Am. Chem. Soc. 1994, 116, 25, 11512–11521Publication Date (Print):December 1, 1994Publica…
Abstract Interfacial tension is one of the most important parameters that govern the morphology of polymer blends and the quality of adhesion between polymers. However, few data are available on interfacial tension due to experimental difficulties. A pendant drop apparatus was used for the determination of the interfa…
Abstract Clay samples of greenish colour were collected from submarine hydrothermal chimneys of the Galapagos Rift and Mariana Trough. Mineralogical and chemical investigations of the clay by scanning and transmission electron microscopy, X-ray diffraction, differential thermal analysis, infrared-spectros-copy, X-ray…
The theory for the coupled perturbed Kohn–Sham calculation of hyperpolarizabilities using nonlocal density functionals is presented. Results for calculations on formaldehyde, acetonitrile, and methyl fluoride using moderate size basis sets are reported. These results are compared with previous density functional calcu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Molecular Structure on the Thermodynamics of Block Copolymer MeltsC. C. Lin, S. V. Jonnalagadda, P. K. Kesani, H. J. Dai, and N. P. BalsaraCite this: Macromolecules 1994, 27, 26, 7769–7780Publication Date (Print):December 1, 1994Publication History Published online…
Natural pyrochlore and zirconolite undergo a crystalline-aperiodic transformation caused by alpha-decay of 232Th and 2380 at dose levels between 2 X 1014 and 3 X 1017 a/mg. The principal effects of the transformation are volume expansion and microfracturing, providing potential pathways for fluids. Geochemical alterat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin Conversion versus Antiferromagnetic Interaction in Iron(II) Trinuclear Species. Crystal Structures and Magnetic Properties of [Fe3(p-MeOptrz)8(H2O)4](BF4)6 and [Fe3(p-MeOprtz)6(H2O)6](tos)6 [p-MeOptrz = 4-(p-Methoxyphenyl)-1,2,4-triazole, tos = tosylate]Martina Thomann,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicellization Kinetics of Block Copolymers in Selective SolventChikako Honda, Yuki Hasegawa, Rieko Hirunuma, and Takuhei NoseCite this: Macromolecules 1994, 27, 26, 7660–7668Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inis…
Results from a high resolution calorimetric study for the alkylcyanobiphenyl liquid crystal series nCB, with n the number of carbons in the alkyl chain, confined to the 0.2 \ensuremath{\mu}m diam cylindrical pores of Anopore membranes are reported. The orientational order at the pore wall is controlled and varied from…