Materials Literature
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Poly(2,6-(4,4-dialkyl)-4H-cyclopenta[2,1-b:3,4-b′]dithiophene) (PCPDT) homopolymers and poly[(2,7-(9,9-dialkyl)fluorene)-co-(2,6-(4,4-dialkyl)-4H-cyclopenta[2,1-b:3,4-b′]dithiophene)] (PF/PCPDT) copolymers have been synthesized according to Yamamoto with Ni(COD)2 (or NiCl2/Zn in the case of the homopolymer). PCPDT is…
The viscoelastic moduli (elasticity and dilational viscosity) of monolayers of P4HS have been studied over a broad frequency range (0.1 mHz–200 kHz) using a combination of relaxation and capillary waves techniques. The analysis of the surface pressure, the elasticity and the viscosity in the semidilute regime show tha…
beta-Alanine synthase (EC 3.5.1.6), which catalyzes the final step of pyrimidine catabolism, has only been characterized in mammals. A Saccharomyces kluyveri pyd3 mutant that is unable to grow on N-carbamyl-beta-alanine as the sole nitrogen source and exhibits diminished beta-alanine synthase activity was used to clon…
Polyethylene/graphite composites have been prepared by two different methods. In a first approach, the ethylene polymerization has been catalyzed by metallocene in the presence of neat graphite particles (NGC composites). A second series of composites (TGC) has been prepared by the polymerization-filling technique, wh…
Electron donor−π−acceptor chromophores 5, 9, 11, 18−20, 21, 22, 27, 28a, 28c, 31, 32, 34−36, 38a−c, 41a, 41c, and 42 have been synthesised. The donor units are 1,3-dithiole and ferrocene; conjugated ethylenic, phenyl, phenylenevinylene, thienyl, bithienyl, terthienyl, or thienylenevinylene linkers act as a central π-e…
Isocitrate dehydrogenase from Bacillus subtilis (BsIDH) is a member of a family of metal-dependent decarboxylating dehydrogenases. Its crystal structure was solved to 1.55 A and detailed comparisons with the homologue from Escherichia coli (EcIDH), the founding member of this family, were made. Although the two IDHs a…
Chiral non-symmetric dimeric liquid crystals consisting of a cholesteryl ester moiety as chiral entity and a biphenyl aromatic core, interconnected through n-butyl (C4) or n-pentyl (C5) parity alkylene spacers, have been synthesized and investigated for their liquid crystalline properties. All the dimers exhibit enant…
We have developed a single transistor ferroelectric memory using stack gate PZT/Al/sub 2/O/sub 3/ structure. For the same /spl sim/40 /spl Aring/ dielectric thickness, the PZT/Al/sub 2/O/sub 3//Si gate dielectric has much better C-V characteristics and larger threshold voltage shift than those of PZT/SiO/sub 2//Si. Be…
We report an experimental study of the shape of large liquid drops spreading on surfaces with patterns of wettability. A heterogeneous surface exhibits multiple energy minima of free energy for the three-phase system. In particular, when the distribution of defects on the substrate is periodic (square or hexagonal), i…
This paper proposes to use a fuzzy-neural network system to predict and display the drape image of garments made of different fabrics and styles. The new approach is used to develop a prototype drape prediction system to predict the drape of a lady's dress style made from different fabrics. The advantages and disadvan…
SiC–BN composites were prepared via the proposed in situ reaction, which used Si 3 N 4 , B 4 C, and carbon as reactants. Adding SiC powder to the reactants controlled the BN content in the composite. For comparison, SiC–BN composites with the same phase compositions were produced via conventional processing. The in si…
Cu substituted Ni-Zn ferrites, with different copper content, were prepared by a conventional ceramic technique. Structural and magnetic properties of the ferrites were characterized by X-ray diffraction, scanning electron microscopy, frequency dependent power loss, and high frequency (10/sup 6/-10/sup 9/ Hz) permeabi…
Polylactide, which is a biodegradable and bio-absorbable polymer having low immunogenicity and good biocompatibility, has been mainly studied for biomedical applications. Branched polymers have different rheological and mechanical properties compared with their linear counterparts owing to their molecular architecture…
Steady-state fluorescence spectra and decays of excitations of a phosphorus-containing dendrimer labeled with 12 internal labels and of an iminophosphorane model compound bearing two labels dissolved in acetonitrile, diglyme, 1,4-dioxane, triethylene glycol, and cyclohexanol revealed that the interior of dendrimers co…
3-isopropylmalate dehydrogenase (IPMDH) from the psychrotrophic bacterium Vibrio sp. I5 has been expressed in Escherichia coli and purified. This cold-adapted enzyme is highly homologous with IPMDHs from other organisms, including mesophilic E. coli and thermophilic Thermus thermophilus bacteria. Its molecular propert…
The novel thioantimonate(III) [Fe(C4H13N3)2]Sb6S10 · 0.5 H2O was synthesised under mild hydrothermal conditions by allowing elemental Fe, Sb, and S to react in a 50% diethylenetriamine (dien) solution. The compound crystallises in the monoclinic space group C2/c with a = 33.789(3), b = 8.5697(4), c = 24.620(2) Å, β =…
Abstract There has been little effort. to quantitatively understand graft copolymerization in batch and continuous mixers. Little information exists on the evolution of grafting reactions with respect to residence time in an internal mixer or along the screw axis in a twin‐screw extruder. In this study, maleic anhydri…
The effect of starting SiC powder (β‐SiC or α‐SiC), with simultaneous additions of Al 2 O 3 and Y 2 O 3 , on the microstructural evolution of liquid‐phase‐sintered (LPS) SiC has been studied. When using α‐SiC starting powder, the resulting microstructures contain hexagonal platelike α‐SiC grains with an average aspect…
The synthesis of surfactant-templated silicate materials has developed rapidly over the past decade. The uniform controlled pore sizes created in the amorphous silicate framework by this method show promise as catalyst supports, sensors, filtration membranes and in a variety of optoelectronic applications. Formation o…
Poly(methylmethacrylate) (PMMA), poly(2-hydroxyethyl methacrylate (PHEMA), and poly(2-hydroxypropyl methacrylate) (PHPMA) were modified to improve the wettability by two techniques: plasma and plasma source ion implantation. The modified surfaces were characterized to investigate the dependence of the modification and…