Fernando Rodrigues‐Lima、Claudine Deloménie、Geoffrey H. GOODFELLOW 等 5 位作者2001-06-01Biochemical Journal
Arylamine N-acetyltransferases (EC 2.3.1.5) (NATs) catalyse the biotransformation of many primary arylamines, hydrazines and their N-hydroxylated metabolites, thereby playing an important role in both the detoxification and metabolic activation of numerous xenobiotics. The recently published crystal structure of the S…
Enzyme Structure and FunctionPolyamine Metabolism and ApplicationsBiochemical and Molecular Research
Dennis Bong、M. Reza Ghadiri2001-06-01Angewandte Chemie International Edition
A supramolecular recognition interface is formed through the self-assembly of cyclic D,L-peptides. Phenyl–phenyl interactions direct the solid-state organization of dimeric peptide cyclo[(-L-Phe-D-MeN-Ala-L-hPhe-D-MeN-Ala)2] (1) by forming clusters of edge-to-face contacts between dimers (shown left), which suggests t…
Crystallography and molecular interactionsChemical Synthesis and AnalysisSupramolecular Self-Assembly in Materials
T. Dietl2001-06-01Journal of Applied Physics
The current status and prospects of research on ferromagnetism in tetrahedrally coordinated magnetic semiconductors and their nanostructures are reviewed. Results of a quantitative comparison between experimental and theoretical results, notably for Mn-based III–V and II–VI thin films and heterostructures, are present…
ZnO doping and propertiesMagnetic and transport properties of perovskites and related materialsElectronic and Structural Properties of Oxides
Ryo Sasai、Hideaki Itoh、Itsuki Shindachi 等 5 位作者2001-06-01Chemistry of Materials
The dispersion of clay−diarylethene hybrid materials into an ionic biopolymer, gelatin, was investigated for the successful preparation of highly functional photochromic films. A mixture of the gelatin and the clay−diarylethene hybrid material dispersed in aqueous N,N -dimethylformamide (DMF) was cast on a glass plate…
Porphyrin and Phthalocyanine ChemistryPhotochromic and Fluorescence ChemistryPolydiacetylene-based materials and applications
Ranko Richert2001-06-01Europhysics Letters (EPL)
The time-resolved electric-field relaxation in glassy D-sorbitol is measured by dielectric hole-burning, i.e. with and without a preceding high electric sinusoidal burn field. The question is whether the burn-induced modifications of the response are frequency-selective (dielectric “holes”) and thus indicative of hete…
Material Dynamics and PropertiesPhotochemistry and Electron Transfer StudiesSpectroscopy and Quantum Chemical Studies
Günter Reiter、Gilles Castelein、Jens‐Uwe Sommer2001-06-01Physical Review Letters
We performed annealing experiments on monolamellar polyethyleneoxid crystals. Even well below the melting point, local relaxations of metastable folded states led to pronounced liquidlike morphological changes on a micron scale of shape and perimeter of the crystalline domains, similar to dewetting of liquids. First,…
Block Copolymer Self-AssemblyFluid Dynamics and Thin Filmsnanoparticles nucleation surface interactions
Marilyn Ehrenshaft、Margaret E. Daub2001-06-01Journal of Bacteriology
In this paper we describe the isolation of a second gene in the newly identified pyridoxine biosynthesis pathway of archaebacteria, some eubacteria, fungi, and plants. Although pyridoxine biosynthesis has been thoroughly examined in Escherichia coli, recent characterization of the Cercospora nicotianae biosynthesis ge…
Genomics and Phylogenetic StudiesEnzyme Structure and FunctionBiochemical and Molecular Research
Stephen Lofts、C. Woof、Edward Tipping 等 5 位作者2001-06-01European Journal of Soil Science
Summary The pH buffering and aluminium solubility characteristics of acid soil are important in determining the soil's response to changes in precipitation acidity. The chemistry of soil organic matter (humic substances) plays a key role in both processes, yet is complex and still poorly understood. Nevertheless, mode…
Clay minerals and soil interactionsMine drainage and remediation techniquesPhosphorus and nutrient management
Toshio Kurobori、Min Liu Min Liu、Yukio Hirose2001-06-01Japanese Journal of Applied Physics
The enhancement of the near-IR emission intensity at 200 K excited at the F(Br - ) band in oxygen-doped BaFBr was observed. It was found from the corresponding absorption spectra that the origin is attributed to a thermal dissociation between F(Br - ) centers and O - ions. The role of the oxygen-defect centers was inv…
Luminescence Properties of Advanced MaterialsSolid State Laser TechnologiesSolid-state spectroscopy and crystallography
Robert M. Kriegel、David M. Collard、Charles L. Liotta 等 4 位作者2001-06-01Macromolecular Chemistry and Physics
Polycondensation of dimethyl 2,6-anthracenedicarboxylate and aliphatic diols provides poly(alkylene 2,6-anthracenedicarboxylate)s, PxA. The ethylene homologue, P2A, an analog of PET and PEN (two commodity polyesters), is infusible and insoluble. Polymers prepared from other short diols (1,4-butanediol, 1,6-hexanediol)…
biodegradable polymer synthesis and propertiesSynthesis and properties of polymersSilicone and Siloxane Chemistry
Galina Golubkov、Jesper Bendix、Harry B. Gray 等 7 位作者2001-06-01Angewandte Chemie International Edition
On pyrrole! The pyrrole-based corrole ligands can offer an alternative to porphyrin systems. The manganese corroles 1–4 are readily synthesized, undergo metal- not ligand-based redox chemistry, and 4 in particular shows impressive catalytic activity in the oxygenation of styrene with iodosylbenzene.
Porphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation MechanismsOxidative Organic Chemistry Reactions
作者信息未提供2001-06-01Journal of Phycology
Passy, S. I. Department of Biology, Rensselaer Polytechnic Institute c/o US Geological Survey, 425 Jordan Rd., Troy, NY 12180‐8349 USA On August 27, 1999, diatoms were sampled and current velocity and depth were measured on a regular square sampling grid at 81 locations in an unshaded, cobble‐bottom reach of White Cre…
Aquatic Ecosystems and Phytoplankton DynamicsSoil and Water Nutrient DynamicsDiatoms and Algae Research
Heidi E. Burch、Chris E. Scott2001-06-01Polymer Engineering and Science
Abstract Structure development in the softening/melting processing regime is investigated using the model miscible blend poly(styrene‐co‐acrylonitrile) (SAN)/poly(methyl methacrylate) (PMMA). Feed materials of four different particle sizes are compounded to study their effects upon structure development. Fourier‐trans…
Polymer crystallization and propertiesMaterial Dynamics and PropertiesBlock Copolymer Self-Assembly
Grigoriy I. Greisukh、Evgeniy G. Ezhov、С. А. Степанов2001-06-01Applied Optics
We present what we believe is a new hybrid objective consisting of a gradient-index optical element that has external flat refracting surfaces and is made of two different inhomogeneous materials separated by a cemented spherical surface. Microstructures of diffractive lenses are placed on the flat external surfaces o…
Advanced optical system designOptical Coatings and GratingsNear-Field Optical Microscopy
E.E. Abd El Aal、W. Zakria、A. S. Diab 等 4 位作者2001-06-01Anti-Corrosion Methods and Materials
The cathodic polarization of Ni in hydrochloric acid solutions has been investigated using the galvanostatic technique. The rate of hydrogen evolution reaction was found to depend on the concentration and pH of the solution. The reaction order with respect to hydrogen ion was found to be one. The rise of temperature e…
Corrosion Behavior and InhibitionGas Sensing Nanomaterials and SensorsElectrochemical Analysis and Applications
M. J. Chen、Jerome W. Rathke2001-06-01Journal of Porphyrins and Phthalocyanines
The 1 H NMR spectra of the five-coordinated rhodium phthalocyanine complex Me ( RPc ) Rh (III) (1, RPc = dianion of 1,4,8,11,15,18,22,25-octa-n-pentylphthalocyanine) in toluene indicate that it exists as a discrete monomer at low concentrations. The complex forms a dimer aggregate reversibly in the concentration range…
Photosynthetic Processes and MechanismsPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
Yuki Aoshima、M. Miyazaki、Kazuo Sato 等 6 位作者2001-06-01Japanese Journal of Applied Physics
Silver-based multilayer coatings are well known to be transparent films with low electrical resistivity. In particular, indium and zinc composite oxide (IZO)/silver containing palladium (AgPd) multilayer coatings have good pattering properties and durability. However, the IZO/AgPd multilayer coatings do not have suffi…
ZnO doping and propertiesElectronic Packaging and Soldering TechnologiesThin-Film Transistor Technologies
Cintia Marangoni、Agenor Fúrigo、Gláucia Maria Falcão de Aragão2001-06-01Brazilian Journal of Chemical Engineering
With the aim of producing polyhydroxyalkanoates, a study of the influence of culture conditions (nitrogen and carbon sources and temperature) on the growth of Ralstonia eutropha in stirred flasks was carried out and the use of some low-cost sources (hydrolyzed lactose, inverted sugar and corn steep liquor) as evaluate…
biodegradable polymer synthesis and propertiesMicroplastics and Plastic PollutionBiopolymer Synthesis and Applications
Yu. P. Sukhorukov、A. M. Moskvin、N. N. Loshkareva 等 7 位作者2001-06-01Technical Physics
The Faraday effect spectra were measured in La 0.7 Sr 0.3 MnO 3−δ films. A band attributed to d-d transitions 4 A 2 g - 4 T 2 g in Mn 4+ ions or octahedral complexes (MnO 6 ) 8− was observed in the spectral region of ∼2.7 eV. The position and value of the maximum of the Faraday rotation band and the figure of merit we…
Magnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter PhysicsAtomic and Subatomic Physics Research
Vasilis Pagonis、G. Kitis2001-06-01Radiation Protection Dosimetry
A new thermoluminescence glow curve deconvolution (GCD) function is introduced which accurately describes second order thermoluminescence (TL) curves. The logistic asymmetric (LA) statistical probability function is used with the function variables being the maximum peak intensity (Im), the temperature of the maximum…
Atmospheric chemistry and aerosolsLuminescence Properties of Advanced MaterialsGas Sensing Nanomaterials and Sensors