Domoic acid, the toxic amino acid responsible for amnesic shellfish poisoning, now in Pseudonitzschia seriata (Bacillariophyceae) in Europe
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Materials Literature
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SEASONAL AND SPATIAL VARIATION IN EPIPELIC DIATOM ASSEMBLAGES IN THE SEVERN ESTUARY
The species composition of epipelic algal assemblages on intertidal mudflats was investigated at three sites in the Severn estuary, England, between March 1990 and February 1991. Diatoms were the dominant algal group, comprising greater than 95% of living cells in 100 out of 106 lens tissue samples. Euglenoid algae we…
Ferroelectric phase in Stockmayer fluids
By using a density-functional theory we establish the existence of a ferroelectric nematic phase in fluids consisting of spherical particles which interact with Lennard-Jones and dipolar forces. Our detailed analysis of the thermodynamic limit shows that for a polarized dipolar fluid within a single domain the free en…
Mechanical Stress-Induced Orientation and Ultrastructural Change of Smooth Muscle Cells Cultured in Three-Dimensional Collagen Lattices
The effect of tensile stress on the orientation and phenotype of arterial smooth muscle cells (SMCs) cultured in three-dimensional (3D) type I collagen gels was morphologically investigated. Ring-shaped hybrid tissues were prepared by thermal gelation of a cold mixed solution of type I collagen and SMCs derived from b…
Structural Formation of Poly(ethylene terephthalate) during the Induction Period of Crystallization. 3. Evolution of Density Fluctuations to Lamellar Crystal
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Formation of Poly(ethylene terephthalate) during the Induction Period of Crystallization. 3. Evolution of Density Fluctuations to Lamellar CrystalM. Imai, K. Kaji, and T. KanayaCite this: Macromolecules 1994, 27, 24, 7103–7108Publication Date (Print):November 1, 1…
Rubber toughening of poly(lactide) by blending and block copolymerization
Abstract Copolymers of L‐lactide with 15 or more mole % D‐lactide are amorphous, noncrystallizable hydrolytically degradable materials. These glassy materials are brittle in tension and bending. To make these materials suitable for use as load‐bearing devices in biomedical applications, toughness has to be enhanced. T…
Direct Simulation of Phonon-Mediated Heat Transfer in a Debye Crystal
A direct simulation of phonon-mediated heat transfer is described and preliminary results are reported. The method is derived from past work in simulating gas-dynamic flow and uses a linear array of cells for modeling a one-dimensional heat transfer problem. Central to the development of the technique is the Debye mod…
Camphorsulfonic Acid Fully Doped Polyaniline Emeraldine Salt: In situ Observation of Electronic and Conformational Changes Induced by Organic Vapors by an Ultraviolet/Visible/Near-Infrared Spectroscopic Method
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCamphorsulfonic Acid Fully Doped Polyaniline Emeraldine Salt: In situ Observation of Electronic and Conformational Changes Induced by Organic Vapors by an Ultraviolet/Visible/Near-Infrared Spectroscopic MethodYounan Xia, Alan G. MacDiarmid, and Arthur J. EpsteinCite this: Ma…
A Super-Family of Medium-Chain Dehydrogenases/Reductases (MDR). Sub-Lines including zeta-Crystallin, Alcohol and Polyol Dehydrogenases, Quinone Oxidoreductases, Enoyl Reductases, VAT-1 and other Proteins
The protein super-family of medium-chain alcohol dehydrogenases (and glutathione-dependent formaldehyde dehydrogenase), polyol dehydrogenases, threonine dehydrogenase, archaeon glucose dehydrogenase, and eye lens reductase-active zeta-crystallins also includes Escherichia coli quinone oxidoreductase, Torpedo VAT-1 pro…
Type XII and XIV collagens mediate interactions between banded collagen fibers in vitro and may modulate extracellular matrix deformability.
Type XII and XIV collagens are very large molecules containing three extended globular domains derived from the amino terminus of each alpha chain and an interrupted triple helix. Both collagens are genetically and immunologically unique and have distinct distributions in many tissues. These collagens localize near th…
Microphase Separation in Starblock Copolymer Melts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrophase Separation in Starblock Copolymer MeltsM. W. Matsen and M. SchickCite this: Macromolecules 1994, 27, 23, 6761–6767Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994https://pubs.acs.org/doi/10.10…
Molecular-dynamics study of supercooledortho-terphenyl
We present the results of a detailed molecular-dynamics study of relaxation in the van der Waals system ortho-terphenyl in the supercooled regime. The molecule is described by a simple rigid three-site model, with interactions between different molecules of the Lennard-Jones form. We find that the long-time (\ensurema…
Valence-Bond Charge-Transfer Model for Nonlinear Optical Properties of Charge-Transfer Organic Molecules
The nonlinear optical properties of charge-transfer organic materials are discussed in the framework of a simple valence-bond charge-transfer model. This model leads to analytic formulas for the absorption frequency, hyperpolarizabilities, and bond length alternation, all of which are described in terms of three param…
Lattice dynamics and dielectric properties of incipient ferroelectricTiO2rutile
The phonon frequencies at the \ensuremath{\Gamma} point, the Born effective charges, and the dielectric permittivity tensors of ${\mathrm{TiO}}_{2}$ rutile are calculated using the variational density-functional perturbation theory. The calculated phonon frequencies agree with experiment within a few percent. We analy…
High frequency modulus of hard sphere colloids
The singular nature of the hard sphere potential combined with lubrication stresses near contact poses interesting issues with respect to the high frequency viscoelastic behavior. Dilute theories demonstrate clearly that soft potentials and/or lubrication stresses that reduce the relative mobility to zero at contact l…
Creep of Duplex Microstructures
The tensile creep behavior of two ceramic composite systems exhibiting duplex microstructures was studied relative to their single‐phase constituents in the temperature and stress ranges of 1100–1350°C and 35–75 MPa. The equivolumetric compositions in the Al 2 O 3 : c –ZrO 2 (8 mol% Y 2 O 3 ) and Al 2 O 3 :Y 3 Al 5 O…
Nature of the ferroelectric phase transition inPbTiO3
We have measured quantitatively the temperature dependence of the local distortions of ${\mathrm{PbTiO}}_{3}$ crystals below and above the structural ferroelectric phase transition, using x-ray absorption fine-structure (XAFS) measurements. Two probe atoms, Pb and Ti, were used. The results were analyzed by fitting pa…
New Three-Dimensional Ferrimagnetic Materials: K2Mn[Mn(CN)6], Mn3[Mn(CN)6]2.cntdot.12H2O, and CsMn[Mn(CN)6].cntdot.1/2H2O
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Three-Dimensional Ferrimagnetic Materials: K2Mn[Mn(CN)6], Mn3[Mn(CN)6]2.cntdot.12H2O, and CsMn[Mn(CN)6].cntdot.1/2H2OWilliam R. Entley and Gregory S. GirolamiCite this: Inorg. Chem. 1994, 33, 23, 5165–5166Publication Date (Print):November 1, 1994Publication History Publi…
Narrow Polydispersity Polystyrene by a Free-Radical Polymerization Process-Rate Enhancement
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNarrow Polydispersity Polystyrene by a Free-Radical Polymerization Process-Rate EnhancementMichael K. Georges, Richard P. N. Veregin, Peter M. Kazmaier, Gordon K. Hamer, and Marko SabanCite this: Macromolecules 1994, 27, 24, 7228–7229Publication Date (Print):November 1, 1994…
Electronic Structure and Quadratic Hyperpolarizabilities in Organotransition-Metal Chromophores Having Weakly Coupled .pi.-Networks. Unusual Mechanisms for Second-Order Response
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