Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSurface Properties of the Fluorine-Containing Graft Copolymer of Poly((perfluoroalkyl)ethyl methacrylate)-g-poly(methyl methacrylate)In Jun Park, Soo-Bok Lee, and Chang Kyun ChoiView Author Information Division of Advanced Chemical Technology, Korea Research Institute of Chemic…
In this paper, three case studies intending to apply smart materials to civil structures are presented. The first one is a study of response control using piezoelectric actuators. Actuators are inserted into the bottom of a column to produce a bending moment force. A control algorithm using the model matching method i…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDirect Observation of an Enzyme-Bound Intermediate in the Catalytic Cycle of the Metallo-β-Lactamase from Bacteroides fragilisZhigang Wang, Walter Fast, and Stephen J. BenkovicView Author Information Department of Chemistry The Pennsylvania State University 152 Davey L…
The fdsGBACD operon encoding the four subunits of the NAD+-reducing formate dehydrogenase of Ralstonia eutropha H16 was cloned and sequenced. Sequence comparisons indicated a high resemblance of FdsA (alpha-subunit) to the catalytic subunits of formate dehydrogenases containing a molybdenum (or tungsten) cofactor. The…
Abstract Low‐rate dynamic contact angles of 13 liquids on a polystyrene polymer are measured by an automated axisymmetric drop shape analysis – profile (ADSA‐P). It is found that 7 liquids yielded non‐constant contact angles, and/or dissolved the polymer on contact. From the experimental contact angles of the other 6…
The NiS 2- x Se x system represents one of the best examples of a Mott−Hubbard system, i.e. a system in which, under appropriate conditions of concentration, temperature, or pressure, a metal−insulator transition driven by electron−electron interaction takes place. Here, the metallic phase is either antiferromagnetic…
The Jonscher power law, or ``universal dielectric response'' (UDR) behavior was studied for a range of ${\mathrm{CeO}}_{2}$ solid solutions with ${\mathrm{Y}}^{3+}$ and ${\mathrm{Gd}}^{3+}$ dopants, with particular emphasis on dilute systems which possess relatively simple defect structures. The results show power-law…
X-ray-absorption fine-structure spectra were measured and analyzed for several FeCo cyanides ${M}_{x}{\mathrm{Co}}_{y}{\mathrm{Fe}(\mathrm{CN})}_{6}\ensuremath{\cdot}z{\mathrm{H}}_{2}\mathrm{O}$ $(M=\mathrm{Na},$ K, Rb) which are known to exhibit interesting magnetic properties depending on temperature. X-ray-absorpti…
The optical reorientation of nematic liquid crystals doped with azo dyes is studied. It is shown that in the presence of absorption both the trans and cis isomers enhance significantly the optical torque; they contribute, however, with opposite signs to the net enhancement and tend to cancel each other's effect. The a…
The composition and thickness of thin iron oxide films on polycrystalline pure iron were evaluated from Fe 2p spectra as measured by x-ray photoelectron spectroscopy. To this end the experimental spectra were reconstructed from reference spectra of the constituents Fe0, Fe2+ and Fe3+. The background contributions in t…
Abstract Previous analysis of published experimental results on compaction and relaxation of textile reinforcements allowed the effects of some processing parameters on the mechanical behavior of the reinforcements to be identified. However, a limited number of relaxation results are available; also, the effect of som…
A pulsed electro-acoustic system is described which enables electric fields up to to be generated in thin (100- ) insulating plaque samples with measurement of the dynamic net space charge density, as a function of temperature and of distance through the thickness of the sample, and the external circuit charging curre…
With the aim of bridging the gap between protein sequence and structural analyses, we have developed a tool to aid the identification of new protein sequences by recognizing distant homologues using structural information. The tool generates sequence annotated by structure (SAS) files, applying structural information…
New silicone derivatives that generate no toxic gas during combustion have been developed for use as flame retardants in the aromatic thermoplastics (polycarbonate and its derivatives, acrylonitrile–butadiene–styrene, polystyrene) used in many electronic devices. A special silicone with a branched chain structure, a p…
OBJECTIVE: To compare transient blood-brain barrier disruption (BBBD) by hypertonic mannitol with pharmacological modification of the blood-tumor barrier by the vasoactive peptide bradykinin for delivery of small and large agents to nude rat intracerebral xenografts. METHODS: Female nude rats (n = 104) with 6-day intr…
We study the effect of finite chain length on the collapse transition of stiff-chain macromolecules by means of a Monte Carlo simulation within the framework of the bond fluctuation lattice model. Variable stiffness of the chains was modeled by introducing a potential depending on the angle between successive bonds an…
Enhanced conductivity in conjugated polymer blends can be achieved by supramolecular self-assembly. The authors demonstrate that the morphology of the conducting polymer blend can be modified by crosslinking of one of its components. Ionic crosslinking of the conducting component—poly(3,4-ethylenedioxythiophene) doped…
Eukaryotic sulfatases carry an alpha-formylglycine residue that is essential for activity and is located within the catalytic site. This formylglycine is generated by posttranslational modification of a conserved cysteine residue. The arylsulfatase gene of Pseudomonas aeruginosa also encodes a cysteine at the critical…
The transition from localized to itinerant electronic behavior is shown to be first-order. In a perovskite, segregation into localized-electron and itinerant-electron phases can be accomplished by cooperative atomic displacements. Sr 1 - x Ca x VO 3 and La 1 - x Nd x CuO 3 illustrate single-valent perovskites that exh…
The corrosion tendencies of metals are related with their position in the electromotive series. These electrode potential degrees may change due to the compositions of the alloys, the surrounding media, or due to alterations in the composition because of recurrent casting. Therefore in this research, the electrode pot…