High temperature oxidation of ceramic matrix composites
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Types of cationic complexes based on oxocentred tetrahedra [OM4] in the crystal structures of inorganic compounds
The crystal structures of inorganic compounds comprising cationic complexes containing oxygen atoms coordinated tetrahedrally to metal atoms, or oxocentred groups [OM4], are considered. The linking of the [OM4] tetrahedra in the structures has been analysed and cationic complexes of different structures have been iden…
New Ring-Opening Polymerization via a π-Allylpalladium Complex. 5. Multibranching Polymerization of Cyclic Carbamate To Produce Hyperbranched Dendritic Polyamine
Hyperbranched dendritic polyamine consisting of primary, secondary (a nonbranching junction), and tertiary (a branching junction) amino moieties was produced by Pd-catalyzed decarboxylative ring-opening polymerization of 5-methyleneperhydro-1,3-oxazin-2-one ( 2 ) at 25 °C with the aid of benzylamine as the initiator.…
Chemistry of semiconductor nanoparticles
Basic advances and prospects of further research in the field of the chemistry of nanoparticles are considered. The principal factors determining the unusual physicochemical properties of semiconductor nanoparticles are discussed. It is pointed out that the kinetics of chemical transformations on the surface and in th…
Mechanical properties and morphology of impact modified polypropylene-wood flour composites
The mechanical properties and morphology of polypropylene/wood flour (PP/WF) composites with different impact modifiers and maleated polypropylene (MAPP) as a compatibilizer have been studied. Two different ethylene/propylene/diene terpolymers (EPDM) and one maleated styrene–ethylene/butylene–styrene triblock copolyme…
A Study of the Adsorption of Methyl Radicals on Clean and Oxygen-Modified Ni(100)
The adsorption of methyl radicals has been studied by X-ray photoelectron spectroscopy and temperature-programmed desorption (TPD) on a clean Ni(100) surface, Ni(100) with a chemisorbed oxygen overlayer, and Ni(100) with a NiO(111) oxide overlayer. Methyl radical dosing at surface temperatures of 120−170 K produces ca…
Differential Scanning Calorimetry Evidence for the Existence of a First-Order Thermal Transition in Ultraoriented at-Poly(acrylonitrile)
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDifferential Scanning Calorimetry Evidence for the Existence of a First-Order Thermal Transition in Ultraoriented at-Poly(acrylonitrile)Daisuke Sawai, Tetsuo Kanamoto, and Roger S. PorterView Author Information Department of Applied…
Crystal Structure of Yeast Thymidylate Kinase Complexed with the Bisubstrate Inhibitor P1-(5‘-Adenosyl) P5-(5‘-Thymidyl) Pentaphosphate (TP5A) at 2.0 Å Resolution: Implications for Catalysis and AZT Activation,
The crystal structure of yeast thymidylate kinase (TmpK) complexed with the bisubstrate inhibitor P1-(5'-adenosyl) P5-(5'-thymidyl) pentaphosphate (TP5A) was determined at 2.0 A resolution. In this complex, TmpK adopts a closed conformation with a region (LID) of the protein closing upon the substrate and forming a he…
Kinetics of Hydrolytic Depolymerization of Melt Poly(ethylene terephthalate)
The hydrolytic depolymerization of poly(ethylene terephthalate) (PET) was carried out in a stirred batch reactor at 235, 250, and 265 °C above its melting point and under autogenous pressure. The solid products which were mainly composed of terephthalic acid were analyzed by potentiometric titration and elemental anal…
Linear Free Energy Substituent Effect on Flavin Redox Chemistry
A systematic study on the effect of various substituents at the 7- and/or 8-position on the redox properties of isoalloxazines (flavins) is reported. The redox properties of these flavin derivatives were studied by cyclic voltammetry in 100 mM, pH 7.4 HEPES and 200 mM, pH 10 borate buffers. The magnitude and direction…
Interactions between Domains of Apo Calmodulin Alter Calcium Binding and Stability
Calmodulin (CaM) is an essential protein that exerts exquisite spatial and temporal control over diverse eukaryotic processes. Although the two half-molecule domains of CaM each have two EF-hands and bind two calcium ions cooperatively, they have distinct roles in activation of some targets. Interdomain interactions m…
Diffraction by volume gratings with imaginary potentials
A medium described by an imaginary potential (or imaginary (refractive index) ), that varies sinusoidally in one direction, acts as a volume grating for plane waves incident on it obliquely or normally. Two peculiar features are identified. First, if the potential is weak, so that there are only two significant diffra…
Heterogeneous Oxidation of Allylic and Benzylic Alcohols Catalyzed by Ru−Al−Mg Hydrotalcites in the Presence of Molecular Oxygen
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHeterogeneous Oxidation of Allylic and Benzylic Alcohols Catalyzed by Ru−Al−Mg Hydrotalcites in the Presence of Molecular OxygenKiyotomi Kaneda, Toyokazu Yamashita, Tsuyoshi Matsushita, and Kohki EbitaniView Author Information Department of Chemical Science and Enginee…
Single-Molecule Magnets: Tetranuclear Vanadium(III) Complexes with a Butterfly Structure and an S = 3 Ground State
Reactions of VCl 3 (THF) 3, bpy, and NaO 2 CR (R = Et, Ph; bpy = 2,2‘-bipyridine) in a 1:1:3 ratio in Me 2 CO give [V 4 O 2 (O 2 CR) 7 (bpy) 2 ](ClO 4 ) (R = Et, 1; R = Ph, 4 ) following addition of NBu n 4 ClO 4 . Use of 4,4‘-dimethyl- or 5,5‘-dimethylbipyridine (4,4‘-Me 2 bpy and 5,5‘-Me 2 bpy, respectively) and R =…
Electropolymerization of Acenaphtho[1,2- k ]fluoranthene Derivatives: Formation of a New Conductive Electroactive Electrochromic Hydrocarbon Ladder Polymer
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTElectropolymerization of Acenaphtho[1,2-k]fluoranthene Derivatives: Formation of a New Conductive Electroactive Electrochromic Hydrocarbon Ladder PolymerJeff D. Debad and Allen J. BardView Author Information Department of Chemistry and Biochemistry The University of Te…
Instability and Periodic Deformation in Bilayer Membranes Induced by Freezing
The instability and periodic deformation of bilayer membranes during freezing processes are studied as a function of the difference of the shape energy between the high and the low temperature membrane states. It is shown that there exists a threshold stability condition, bellow which a planar configuration will be de…
First principles theory of inelastic currents in a scanning tunneling microscope
A first principles theory of inelastic tunneling between a model probe tip and an atom adsorbed on a surface is presented, extending the elastic tunneling theory of Tersoff and Hamann. The inelastic current is proportional to the change in the local density of states at the center of the tip due to the addition of the…
Fluorescently Detectable Magnetic Resonance Imaging Agents
This report describes the synthesis, characterization, and in vivo testing of several bifunctional contrast-enhancing agents for optical and magnetic resonance imaging (MRI) of experimental animals. These new agents integrate the advantages of both techniques since they can be visualized simultaneously by light and MR…
Ferroelectric Phenomena in Crystals: Physical Foundations
1. General Characteristics of Structural Phase Transitions in Crystals.- 1.1 First- and Second-Order Structural Phase Transitions.- 1.2 Structural Phase Transitions of Displacive and Order-Disorder Types.- 1.3 The Domain Structure.- 1.4 Ferroelectric Phase Transitions.- 1.5 Basic Types of Ferroelectric Crystals.- 2. P…
Cellulose Pyrolysis Kinetics: Revisited
In the same thermogravimetric analyzer (TGA) under identical conditions, samples of pure, ash-free cellulose (i.e., Avicel PH-105, Whatman CF-11, Millipore ash-free filter pulp, and Whatman #42) obtained from different manufacturers undergo pyrolysis at temperatures which differ by as much as 30 °C. Thus, the pyrolysi…