Materials Literature
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The tetraanionic meso-tetrakis(4-sulfonatophenyl)porphine (H 2 TPPS) in the pH range 5−12 exists in a monomeric form, and its fluorescence is not pH-dependent. However, in the presence of polylysine, absorption, circular dichroism, and resonance light scattering data indicate extensive polymer-induced self-aggregation…
Electrochemical impedance spectroscopy (EIS) was used to study carbon dioxide (CO2) corrosion product scales and their effects on further CO2 corrosion. Objectives were to determine the suitability of EIS for studying corrosion scales and to investigate the influence of environmental factors on scale formation. EIS pr…
Protein storage vacuoles are found in a variety of tissues but are especially abundant in the storage organs of fruits and seeds. In this review, we focus on the protein storage vacuoles of cereal aleurone. In the mature grain, these organelles are repositories for reserve nitrogen, carbon and minerals. Following imbi…
Abstract The thermal dehydration of naturally occurring Ca-montmorillonite has been studied by in situ X-ray diffraction at temperatures between 60–120°C. The time-temperature-dependence of the position of the basal (001) reflection reveals that interlayer water loss on isothermal dehydration occurs in two stages. Aft…
A multidimensional transition state theory (TST) approach is formulated for the study of elementary jumps involved in the diffusion of a gaseous penetrant in a glassy polymer, taking explicitly into account the coupling between polymer and penetrant degrees of freedom along each jump. In this approach, an initial pict…
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…