Materials Literature
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Purified recombinant poly(hydroxyalkanoic acid), PHA, synthase from Chromatium vinosum was used to examine in vitro poly(3-hydroxybutyric acid) (P(3HB)) formation. In combination with purified propionyl-coenzyme A transferase of Clostridium propionicum a two-enzyme in vitro P(3HB) biosynthesis system was established w…
The undecamer of poly-L-leucine at the water-hexane interface is studied by molecular dynamics simulations. This represents a simple model relevant to folding and insertion of hydrophobic peptides into membranes. The peptide, initially placed in a random coil conformation on the aqueous side of the system, rapidly tra…
Pyrolysis of organometallic precursors such as metallocenes and iron pentacarbonyl as well as of their mixtures with hydrocarbons such as acetylene or benzene has been carried out under a variety of conditions to synthesize nanotubes. While the use of benzene as a hydrocarbon source generally yields multi-walled nanot…
In thin films of smectic C liquid crystals, localized regions containing additional smectic layers form circular inclusions that carry a topological charge. Such inclusions nucleate a companion topological defect. These inclusion-defect pairs are modelled as topological dipoles within the context of a one-coupling con…
Pluronic surfactants, PEO-PPO-PEO triblock copolymers, have been investigated widely due to their protein-resistant properties in applications as coatings for implants and in controlled drug release systems. We have studied a wide range of these copolymers, varying in both PEO and PPO block size, by adsorbing them to…
Experimental evidence of a cation-pi interaction between a sodium cation (Na+) and the indole ring of residue Trp123 in a structure (2.0 A) of hen egg-white lysozyme is presented. The geometry of the metal ion-pi interaction observed in the protein structure (distance between the aromatic plane and the cation approxim…
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…