Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Polypyrrole and polypyrrole−tetracyanoquinodinodimethane (TCNQ) have been prepared to see the energy band structure modification and associated change in the electrical and optoelectrical properties. The temperature-dependent electrical conductivity of the samples show interesting behavior, namely, higher room-tempera…
A detailed study of the light-induced gratings in Methyl-Red-doped 4-n-pentyl-4′-cyanobiphenyl (5CB) homeotropically aligned is reported. In particular, the dependence of diffraction efficiency upon the pump and probe polarizations has been investigated both for transient and permanent gratings. Our results confirm th…
Abstract The effect of molecular structure (MW, MWD and LCB) on the critical tensile stress (σ c ) for the onset of gross melt fracture (OGMF), proposed in Part I (1) as a material‐dependent criterion for fracture, was determined for a group of polyethylenes varying in structure. These included linear low and high‐den…
In Escherichia coli, the homodimeric Krebs cycle enzyme isocitrate dehydrogenase (EcIDH) is regulated by reversible phosphorylation of a sequestered active site serine. The phosphorylation cycle is catalyzed by a bifunctional protein, IDH kinase/phosphatase (IDH-K/P). To better understand the nature of the interaction…
The melt rheological properties of short sisal fibre reinforced polypropylene composites have been studied using a capillary rheometer. The dependence of the relative composition of component reinforcements and their aspect ratio and also the extent of chemical modification on the overall rheological behaviour have be…
Excellent mechanical properties make γ-Si2AlON3, one of the first spinel sialons and 4-3-spinels, a promising material for structural and abrasive applications. The hardness of this phase synthesized at 13 GPa/1800°C surpasses that of the low-pressure α- and β-sialons, which are used for metal-cutting and engineering…
An experimental setup, made up of a three-limbed ferromagnetic core fitted with pickup coils, has been designed and built to be used as test bench for validation of magnetic field analysis with hysteresis. Unidirectional or rotational flux patterns and distorted waveforms can be generated by modifying the supply condi…
Abstract Fourier transform (FT) Raman and surface‐enhanced Raman spectroscopy (SERS) were applied to the vibrational characterization of isoquinoline and 4‐methylquinoline. The assignment of the vibrational modes was carried out on the basis of results obtained from density functional theory calculations. The comparis…
Diamond films were deposited on silicon wafers of 25–152 mm in diameter by a 60-kW 915-MHz plasma CVD system with a input power of 15–60 kW at a gas pressure of 11.3–17.7 kPa using H 2 CH 4 or H 2 CH 4 CO 2 gas mixtures . Growth orientation of the diamond films and α parameters for the different growth conditions h…
Methylaspartate ammonia-lyase (3-methylaspartase, MAL; EC ) catalyzes the reversible anti elimination of ammonia from L-threo-(2S,3S)-3-methylaspartic acid to give mesaconic acid. This reaction lies on the main catabolic pathway for glutamate in Clostridium tetanomorphum. MAL requires monovalent and divalent cation co…
Zirconia was prepared by firing the coprecipitate from ZrOCl 2 and AlCl 3 mixed aqueous solution with ammonia. When fired above 600°C, the products were fine crystalline tetragonal zirconia of crystallite size <10 nm. In previous studies, the tetragonal phase had been assumed to be a (Zr 1− x 4+ Al x 3+ )O 2− x /2…
Abstract In an investigation into making more effective use of underutilized fisheries resources, collagen was prepared from Callistoctopus arakawai arm. The arm was only slightly solubilized in acetic acid but on digestion with 10% pepsin (w/v), pepsin-solubilized collagen (PSC) was successfully produced. The PSC obt…
Tryptophan synthase catalyzes the last two steps in the biosynthesis of the amino acid tryptophan. The enzyme is an alpha beta beta alpha complex in mesophilic microorganisms. The alpha-subunit (TrpA) catalyzes the cleavage of indoleglycerol phosphate to glyceraldehyde 3-phosphate and indole, which is channeled to the…
We have designed, synthesized and evaluated dibenzothiophenylacetylene homologues as new heterocyclic molecules which were expected to have high δα values and short wavelength UV absorption spectra. The dibenzothiophenyl acetylene homologues exhibited wide nematic phase ranges and had very high extrapolated δn of over…
As propriedades químicas e cristalográficas detalhadas da caulinita (Ct) e dos óxidos de ferro do solo e dos sedimentos do Grupo Barreiras são pouco conhecidas. Para estudar as características desses minerais em profundidade, coletaram-se 11 amostras (0,7; 1,4; 2,1; 2,8; 3,5; 4,2; 4,9; 5,6; 7,7; 10,5 e 14m) nos horizo…
Tryptophan synthase is a bifunctional alpha(2)beta(2) complex catalyzing the last two steps of l-tryptophan biosynthesis. The natural substrates of the alpha-subunit indole- 3-glycerolphosphate and glyceraldehyde-3-phosphate, and the substrate analogs indole-3-propanolphosphate and dl-alpha-glycerol-3-phosphate are al…
We describe concept, design, and performance of a novel spin polarimeter based on spin-dependent specular reflection of electrons from a Fe(100) surface. The Fe surface is prepared as an ultrathin film on Ag(100). By tuning the energy of the electrons to a critical point in the Fe band structure, a large spin asymmetr…
Tetragonal BaTiO 3 powders were prepared hydrothermally at 240°C, in only 12 h, using BaCl 2 ·2H 2 O and TiCl 4 , which are rather easy to manipulate. Characterization via X‐ray diffractometry, scanning electron microscopy, Brunauer–Emmett–Teller analysis, and differential scanning calorimetry confirmed that increasin…
We prepared two new linkers, S-functionalized adamantane derivatives 2 and 3, which bind as monolayers on polycrystalline gold. From these surface anchors, both L- and D-isomers of alanine can be grown as thin films of α-helical polypeptides directed from the gold surface by using the appropriate N-carboxyalanine anhy…
Pseudomonas oleovorans NRRL B-778 accumulated mixtures of poly-3-hydroxybutyrate (PHB) and medium-chain-length poly(hydroxyalkanoates) (mcl-PHAs) when grown on glucose, octanoic acid or oleic acid, whereas growth on nonanoic acid or undecanoic acid resulted in copolymers of poly-3-hydroxybutyrate-co-3-hydroxyvalerate…