Materials Literature
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Diatom species formerly referred to the genus Symbolophora Ehrenb. are herein assigned partly to Symbolophora sensu Hasle & Sims and partly to Stellarima nom. nov. The generitype for Symbolophora is established as S. trinitatis Ehrenb. and that for Stellarima as S. microtrias (Ehrenb.) comb. nov. Symbolophora has been…
Microscopic multichain models of amorphous and crystalline regions of an oriented polymer fiber have been examined using molecular dynamics computer simulation. A lamina model was used in which the chains were suspended between two fixed parallel planes representing the faces of adjacent crystallites. The ordered stru…
It has been recently shown that the system potassium laurate-- decanol--water presents three nematic phases, two uniaxial and one biaxial. We are currently investigating the structure of these phases by scattering methods. The study reported here describes the first experiment, neutron scattering with contrast variati…
Abstract The conditions for the formation of the β‐form of isotactic polypropylene in the presence of a β‐nucleator and the β‐α transition during heating were studied by wide angle X‐ray diffraction. A conditional crystallinity of the β‐form, X′ β , and a structural disorder parameter, S , deduced from WAXD data were…
Analytical expressions for the static structure function for a polydisperse Percus-Yevick fluid with Schulz (gamma) distributed particle diameters have been obtained. Results obtained with the expression for selected width factors and particle densities are presented.
This report describes the release of methotrexate and cis-platinum analogues JM8 and JM9 from phase transition liposomes. Large unilamellar liposomes were able to quickly release the antineoplastic agents employed during in vitro tests. Methotrexate exhibited a 73 per cent release in one second. The cis-platinum analo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEXAFS evidence for direct rhodium-iron bonding in silica-supported rhodium-iron bimetallic catalystsMasaru Ichikawa, Takakazu Fukushima, Toshihiko Yokoyama, Nobuhiro Kosugi, and Haruo KurodaCite this: J. Phys. Chem. 1986, 90, 7, 1222–1224Publication Date (Print):March 1, 198…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModified taxols. 2. Oxidation products of taxolNeal F. Magri and David G. I. KingstonCite this: J. Org. Chem. 1986, 51, 6, 797–802Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March 1986https://pubs.acs.org/doi/10.102…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-modified electrodes: oxidative electropolymerization and deposition of Ni[Me4(RBzo)2[14]tetraeneN4] complexesCynthia L. Bailey, Robert D. Bereman, D. Paul Rillema, and Robert NowakCite this: Inorg. Chem. 1986, 25, 7, 933–938Publication Date (Print):March 1, 1986Publi…
Abstract Thermodynamics of K‐Ca exchange were compared using equilibrium and kinetic approaches in two Delaware soils. The classical Argersinger theory was employed for the equilibrium approach, while a kinetic approach was studied using miscible displacement, batch, and vigorously mixed batch techniques. These three…
SUMMARY Some key ideas and experimental findings concerning the probability that crystallization of a liquid or its binary solutions will occur at moderate cooling rates are discussed. The use of cryoprotectants and of pressure to favourably influence these probabilities is rationalized, and some of the newer findings…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of bis(trimethylammonium) decabromotetracuprate(II): a review of stacking patterns in pseudoplanar CunX2n+22- and CunX2nL2 oligomersUrs. Geiser, Roger D. Willett, Martha. Lindbeck, and Kenneth. EmersonCite this: J. Am. Chem. Soc. 1986, 108, 6, 1173–1179Publ…
Compacts formed from high‐purity fused submicrometer mullite powders, both pure and with the additions of 5 to 25 vol% ZrO 2 of particle size 1, 2, or 4 μm (average), were sintered in air at 1610°C for 6 h to form dense ceramic bodies. Mechanical properties (flexural strength, K ic , and Young's modulus) were measured…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 NMR of liquid crystals. Spinning near the magic angle with proton-proton dipolar decouplingB. M. Fung and Jalees. AfzalCite this: J. Am. Chem. Soc. 1986, 108, 5, 1107–1108Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure, reactivity, and electrochemistry of free-base .beta.-oxoporphyrins and metallo-.beta.-oxoporphyrinsAlan M. Stolzenberg, Paul A. Glazer, and Bruce M. FoxmanCite this: Inorg. Chem. 1986, 25, 7, 983–991Publication Date (Print):March 1, 1986Publication History Publish…
Characterization of the growth of a small patch of surface, e.g., the outer face of a growing cell during a fixed period of time, can take the form of a strain cross. The long arm of the cross shows the maximum relative extension in the patch. The length of the short arm indicates the minimum extension. With the conve…
The thermotropic phase transitions and the mesophase structure of two long-chain alkyl pyridinium halides are described. From small angle X-ray diffraction, optical microscopy, differential scanning calorimetry and dilatometry, the single liquid-crystalline phase found in each material is identified as smectic A. It i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrodynamics, enrichment, and collapse in foamsGanesan Narsimhan and Eli RuckensteinCite this: Langmuir 1986, 2, 2, 230–238Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March 1986https://pubs.acs.org/doi/10.1021/la00…
Abstract (±)-1,2-Diphenylethylenediamine (DPEDA) was efficiently resolved by the fractional crystallization of its diastereomeric salts with optically active mandelic acid. 1H-NMR spectrum of N-monoacylated DPEDA with an optically active derivatizing agent showed that DPEDA thus obtained was optically pure.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox chemistry and spectroscopy of toluene-3,4-dithiol (TDTH2) and of its M(TDT)22-/- complexes with zinc(II), copper(II), nickel(II), cobalt(II), iron(II), and manganese(II). Formation of a stable dn-(.cntdot.SR) bond upon oxidation by one electronDonald T. Sawyer, G. Susa…