Magnetic-field–induced singlet-triplet phase transition in quasi–one-dimensional organic superconductors
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A Cyclobutanone Analogue Mimics Penicillin in Binding to Isopenicillin N Synthase
A carbocyclic analogue of the beta-lactam antibiotic isopenicillin N (IPN) has been synthesised and cocrystallised with isopenicillin N synthase (IPNS), the central enzyme in the biosynthesis of penicillin antibiotics. The crystal structure of the IPNS-cyclobutanone complex reveals an active site environment similar t…
Cooperative enhancement of in-plane orbital ordering by oxygen deficiency and in-plane tensile strain in La 0.7 Sr 0.3 MnO 3−δ thin films
The development of in-plane orbital ordering with oxygen deficiency is investigated in epitaxially strained thin films of La 0.7 Sr 0.3 MnO 3- δ grown under in-plane tensile strain on SrTiO 3 substrates. The orbital character of 3 d states is directly probed by linear dichroism in X-ray absorption spectroscopy at the…
TAMR effect in (Ga,Mn)As-based tunnel structures
We discuss the results of our experiments on tunnel devices based on (Ga,Mn)As structures. Those include p + -(Ga, Mn)As/n + -GaAs Esaki diodes and laterally defined narrow nanoconstrictions in (Ga,Mn)As epilayers. We found in those structures strong anisotropic magnetoresistance behaviour with features that could be…
Effect of silane KH‐550 to polypropylene/brucite composite
Abstract The effect of the KH‐550 type silane coupling agent on the properties of polypropylene (PP)/brucite (BC) composite was studied. X‐ray diffraction, scanning electron microscope, and polarization optical microscope indicated that morphology structure of PP changed with the addition of KH‐550, which activated th…
Synthesis and Properties of Dumbbell-Shaped Dendrimers Containing 9-Phenylcarbazole Dendrons
We report the synthesis and structural characterization of two dumbbell-shaped dendrimers incorporating 9-phenylcarbazole units as dendrons, as well as their thermal, morphological, photophysical, and electrochemical properties.
Preparation and Dielectric Properties of Nanostructured ZnO Whiskers
By a novel controlled combustion synthesis method, a large number of nanostructured ZnO whiskers with different morphologies, such as tetra-needles, long-leg tetra-needles and multi-needles, are prepared without any additive in open air at high temperature. The morphologies and crystalline structures of the as-prepare…
Dielectric spectroscopy in benzophenone: Theβrelaxation and its relation to the mode-coupling Cole-Cole peak
We report a thorough characterization of the glassy dynamics of benzophenone by broadband dielectric spectroscopy. We detect a well-pronounced beta relaxation peak developing into an excess wing with increasing temperature. A previous analysis of results from Optical-Kerr-effect measurements of this material within th…
Depletion Interactions: A New Control Parameter for the Self-Assembly of Diblock Copolymer Micelles
Small angle neutron scattering was performed on disordered mixtures of nonadsorbing homopolymer (A) chains and diblock (A-B) copolymer micelles in an A selective solvent. Increasing the molecular weight or concentration of A led to an increase in the aggregation number, and a decrease in the effective hard-sphere diam…
Energy Transfer between CdSe/ZnS Core/Shell Quantum Dots and Fluorescent Proteins
Fluorescent proteins from the green fluorescent protein (GFP) family interact strongly with CdSe/ZnS quantum dots. Photoluminescence of GFP5 is suppressed by red-emitting CdSe/ZnS quantum dots with high efficiency in a pH-dependent manner. The elevated degree of quenching, around 90%, makes it difficult to analyze the…
Mechanism of Selective Etching of SiGe Layers in SiGe/Si Systems
Selective lateral etching of the SiGe layer for various Si/SiGe/Si systems was studied. We showed the different etching rates for SiGe layers with the same thickness and Ge concentration, but with different structures of the Si/SiGe/Si stacked layer. We described a mechanism that could explain the experimental results…
Collaborative Annotation of 3D Crystallographic Models
This paper describes the AnnoCryst system-a tool that was designed to enable authenticated collaborators to share online discussions about 3D crystallographic structures through the asynchronous attachment, storage, and retrieval of annotations. Annotations are personal comments, interpretations, questions, assessment…
Subdaily Growth Patterns and Organo-Mineral Nanostructure of the Growth Layers in the Calcitic Prisms of the Shell of Concholepas concholepas Bruguière, 1789 (Gastropoda, Muricidae)
Fluorochrome marking of the gastropod Concholepas concholepas has shown that the prismatic units of the shell are built by superimposition of isochronic growth layers of about 2 mum. Fluorescent growth marks make it possible to establish the high periodicity of the cyclic biomineralization process at a standard growth…
Degumming of decorticated ramie: Effects of alkalis on gummy compositions vis-à-vis their properties
Various alkalis, judiciously selected on the basis of their base dissociation constant (K b), were used for degumming of ramie fiber. They were graded according to their performance with respect to the removal of individual components of the gummy material. The fiber properties were analyzed in terms of residual gum c…
Imaging of blood plasma coagulation and its propagation at surfaces
A new method utilizing image capture and processing was developed for the analysis of blood plasma coagulation at surfaces. The coagulation was detected in a cuvette by time-lapse image capture of light scattering from the developing fibrin network. By image processing and computer analysis of the captured image data,…
Influence of epoxy resin on the morphological and rheological properties of PBT/ABS blends compatibilized by ASMA
Abstract Polybutylene terephthalate (PBT)/acrylonitrile–butadiene–styrene (ABS) copolymer blends compatibilized by a mixture of styrene–acrylonitrile–maleic anhydride (ASMA) copolymers and epoxy resin (EP) were prepared through melt reactive extrusion. The morphological, rheological, and mechanical properties of these…
Effect of nitrogen doping on bonding state of ZnO thin films
Nitrogen (N) is the most promising p-type dopant for zinc oxide (ZnO) with wurtzite structure. The substitution of N atoms for partial replacement of O atoms in wurtzite structure is predicted to cause the slight change in bonding state. We have synthesized ZnO and N-doped ZnO thin films by utilizing a pulsed laser de…
Molecular structure and dynamics of off-center Cu2+ ions and strongly coupled Cu2+–Cu2+ pairs in BaF2 crystals: Electron paramagnetic resonance and electron spin relaxation studies
X-band and Q-band electron paramagnetic resonance (EPR) spectra of Cu(2+) in BaF(2) crystal were recorded in the temperature range of 4.2-200 K. Spin-Hamiltonian parameters of single Cu(2+) complexes and of Cu(2+)-Cu(2+) pairs were derived and discussed. A special attention was paid to the dimeric species. Their molec…
Fibrous and Helical Calcite Crystals Induced by Synthetic Polypeptides ContainingO‐Phospho‐L‐Serine andO‐Phospho‐L‐Threonine
The modification of CaCO(3) crystal growth by synthetic L-Ser(PO(3)H(2)) and L-Thr(PO(3)H(2)) containing polypeptides is described. The amino acids Gly, L-Glu, L-Asp, L-Ser, L-Ala, and L-Lys induced rhombohedral calcite with a rough surface. Dipeptides, Xaa-L-Ser(PO(3)H(2)) (Xaa = Gly, L-Glu, L-Asp, L-Ser, L-Ala and L…
Thermal and dynamic mechanical behavior of poly(vinyl chloride)/wood flour composites
Abstract Thermal and dynamic mechanical behaviors of wood plastic composites made of poly vinyl chloride (PVC) and surface treated, untreated wood flour were characterized by using differential scanning calorimetry and dynamic mechanical analysis. Glass transition temperature ( T g ) of PVC was slightly increased by t…