Materials Literature
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The resistivity of films of the metallic magnet ${\mathrm{CrO}}_{2}$ deposited onto ${\mathrm{ZrO}}_{2}$ substrates has been measured in the temperature range $T=1.6$ to 410 K. Longitudinal and transverse magnetoresistances have also been measured between 0.55 and 380 K in magnetic fields up to 10 T. The resistivity h…
We sought to examine whether surface modification of expanded polytetrafluoroethylene (ePTFE) vascular grafts might extend graft patency without modifying the graft structure. Amide and amine plasma (butylamine) were applied to graft surfaces using radio frequency glow discharge. Surface analyses by Fourier transform…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPreparation of a Redox-Gradient Dendrimer. Polyamines Designed for One-Way Electron Transfer and Charge CaptureTrent D. Selby and Silas C. BlackstockView Author Information Department of Chemistry, The University of Alabama Tuscaloosa, Alabama 35487-0336 Cite this: J.…
Mel-CAM (also termed CD146 or MUC18) is a cell-adhesion molecule belonging to the immunoglobulin gene superfamily. It mediates cell-cell interaction through heterophilic Mel-CAM/ligand adhesion. Previous studies showed Mel-CAM immunoreactivity in normal and neoplastic human tissues, but an extensive assessment of Mel-…
Piezoelectric Pb((Zn 1/3 Nb 2/3 ) 0.91 Ti 0.09 )O 3 (PZNT 91/9) single crystals 40 mm in diameter were successfully grown from solution by the Bridgman method with a PbO flux. The crystals were grown in a platinum crucible heated to 1130°C. Growth rate was 0.35 mm/h. The obtained crystals were ~40 mm in diameter 20 mm…
Collagen biosynthesis is a complex process that begins with the association of three procollagen chains. A series of conserved intra- and interchain disulfide bonds in the carboxyl-terminal region of the procollagen chains, or C-propeptide, has been hypothesized to play an important role in the nucleation and alignmen…
The K-band λmax values of the UV spectra of five types of p-Y-benzaldehyde derivatives, namely phenylhydrazones (1-Ys), 2,4-dinitrophenylhydrazones (2-Ys), 4-nitrophenylhydrazones (3-Ys), semicarbazones (4-Ys) and N-phenylsemicarbazones (5-Ys), were measured and the corresponding wavenumbers (νmax) calculated. Correla…
The catalytic decomposition of ozone in the presence of water vapor at the relative humidity (RH) of about 90 % was investigated by using a tubular fixed‐bed reactor. The performance tests and reaction kinetic studies were conducted for catalyst, i.e., Pt/γ ‐Al2O3 (symbolized as Dash‐220). The experiments were carried…
Spatial fluctuations of the local electric field induced by a constant applied electric field in composite media are studied analytically and numerically. It is found that the density of states for the fields exhibit sharp peaks and abrupt changes in the slope at certain critical points which are analogous to van Hove…
Tin oxide thin films were deposited by reactive radio-frequency magnetron sputtering onto In(2)O(3):Sn-coated and bare glass substrates. Optical constants in the 3002500-nm wavelength range were determined by a combination of variable-angle spectroscopic ellipsometry and spectrophotometric transmittance measurements.…
Specific cell adhesion in the marine sponge Microciona prolifera is mediated by an extracellular aggregation factor complex, whose main protein component, termed MAFp3, is highly polymorphic. We have now identified MAFp4, an approximately 400-kDa protein, from the aggregation factor that is translated from the same mR…
We report an experimental investigation on long chain branching (LCB) in ethylene polymerization with the Dow Chemical's constrained geometry catalyst system, CGC-Ti/TPFPB/MMAO, using a continuous stirred-tank reactor (CSTR) at 140°C, 3.45 × 103 kPa, and a mean residence time (τ) of 4 min. The effects of the catalyst…
Ferric illite (Fe‐illite) developed extensively in a siliciclastic submarine fan sequence within a lime‐mud succession in the Proterozoic Penganga Group at Adilabad, South India. The minerals formed as de novo by preferentially replacing high‐K minerals like alkali feldspar and mica. It is compositionally intermediate…
X-ray crystallographic studies of surface structure have a much shorter history than the IUCr (and crystallography in general) because it is a technique that requires very intense sources of X-rays. It did not become widely practiced until synchrotron-radiation user facilities became established in the 1980s. Since th…
Barley starch and glycerol were mixed with polycaprolactone (PCL) powder in various combinations and plasticized in a twin-screw extruder. When possible, extrudates were processed into films in a single-screw extruder and subjected to an orientation process with the aim of improving the water durability and mechanical…
The crystallinity of multicomponent glass‐ceramic mixtures has been analyzed via the Rietveld method, using powder X‐ray diffractometry data. The Rietveld technique uses an internal standard but requires no calibration data to determine the total amorphous phase content of a mixture. This method of analyzing the cryst…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTwo-Photon Spectroscopy of d3 Transition Metals: Near-IR-to-Visible Upconversion Luminescence by Re4+ and Mo3+Daniel R. Gamelin and Hans U. GüdelView Author Information Institut für Anorganische Chemie, Universität Bern Freiestrasse 3, CH-3000 Bern 9, Switzerland Cite…
A twinned microstructure is frequently observed after a martensitic phase transition. In this paper we investigate the atomic-level processes associated with the twin formation in a model system, using a many-body potential parametrized to represent zirconium. Molecular-dynamics simulations of the martensitic phase tr…
The most important factor controlling the timing of Phanerozoic mineralogical evolution in the Bivalvia appears to be thermal potentiation of calcite deposition in colder marine and estuarine environments. Cold temperature has promoted mineralogical evolution in the Bivalvia by kinetically facilitating (potentiating)…
The performance of different membrane reactors for the epoxidation of ethylene was compared with that of a conventional fixed-bed reactor (FBR), under identical overall reaction conditions, using a cesium-doped silver catalyst supported on α-alumina. Two packed-bed membrane reactor configurations were used, one using…