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。
Photoexcited [Ru(bpy) 3 ] 2+ (bpy = 2,2‘-bipyridine) can be quenched with [Co(NH 3 ) 5 Cl] 2+ to give [Ru(bpy) 3 ] 3+; this photogenerated oxidant ( E 0 = 1.25 V vs NHE) reacts with horseradish peroxidase isoenzyme c (HRPc) to produce oxidized protein species. Spectra and kinetics measured by laser-flash transient spe…
The diffusion and gelation dynamics of nonsolvent-induced phase inversion in several polyethersulfone (PES)/solvent/nonsolvent systems are observed using a dark-ground optical technique. The observed dynamics are correlated with the resultant morphologies of the solidified gels obtained via scanning electron microscop…
Abstract The Fourier transform Raman spectra of the kaolinite minerals have been measured in the 50–3800 cm −1 region using near infrared spectroscopy. Kaolinites are characterized by remarkably intense bands in the 120–145 cm −1 region. These bands, attributed to the O-Si-O and O-Al-O symmetric bending modes, are bot…
The Bacillus subtilis L-arabinose metabolic genes araA, araB and araD, encoding L-arabinose isomerase, L-ribulokinase and L-ribulose-5-phosphate 4-epimerase, respectively, have been cloned previously and the products of araB and araD were shown to be functionally homologous to their Escherichia coli counterparts by co…
Whole and headless shrimp (Pandalus borealis) were dipped in various concentrations of chitosan solution and stored for 20 days at 4–7°C. The effects of chitosan on microbial proliferation, total volatile bases, nucleotide breakdown, and blackspot formation were monitored over this period. Chitosan showed strong antim…
Peroxo Fe(III), Mn(III), and Ti(IV) porphyrin complexes were reacted with a variety of electron-rich and electron-poor organic substrates in order to compare their reactivities with those of other known metalloperoxide complexes. The peroxoiron(III) porphyrin complex was unreactive with electron-rich substrates such a…
Single crystals of α‐Si 3 N 4 were annealed at 2000°–2150°C. The β phase was detected after annealing at 2150°C only when the crystals were surrounded by MgO·3Al 2 O 3 or Y 2 O 3 powders. On the other hand, no evidence of the α–β transformation was found when the crystals were annealed without additives. The solution–…
Lars Thorbjørn Jensen, Nis Baun Høst; Collagen: scaffold for repair or execution, Cardiovascular Research, Volume 33, Issue 3, 1 March 1997, Pages 535–539, http
Abstract This paper deals with a novel polyelectrolyte complex (PEC) of two natural polyelectrolyte ligands, i.e. chitosan (CS) and pectin (PTn). The composition and its effect on the swelling properties of this CS‐PTn PEC were studied. The results reveal that the swelling of the polyelectrolyte complex is connected w…
An isothiocyanate form of a lanthanide chelate which is highly luminescent when bound to terbium or europium has been synthesized. The chelate consists of diethylenetriaminepentaacetic acid (DTPA) covalently joined to a chromophore, 7-amino-4-methyl-2(1H)-quinolinone (cs124), and to L-p-aminophenylalanine, in which th…
Cu-ZSM-5 samples with various Cu(+)/Cu(2+) ratios have been successfully prepared in three different methods and studied by XPS and FTIR. Cu(+) ions are found, by XPS, to mainly exist in the samples prepared by solution ion exchange and microwave solid-state reaction exchange. On the basis of the chemical shift of the…
The Peierls stress is the stress required to move a dislocation through a perfect crystal lattice. Theoretical estimates show an exponential dependence on the ratio of the spacing between gliding planes and the unit slip distance. Nabarro corrected an error of a factor of 2 in this exponent in Peierls's original estim…
Magnetic and magnetoresistance measurements were carried out on a distorted perovskite, ${\mathrm{Eu}}_{0.58}$${\mathrm{Sr}}_{0.42}$${\mathrm{MnO}}_{3}$. In the absence of applied magnetic field, this compound is an insulator down to 5 K. Results of the ac- and dc-susceptibility measurements suggest a spin-glass groun…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTOxygen Surface Exchange and Diffusion in the New Perovskite Oxide Ion Conductor LaGaO3Tatsumi Ishihara, John A. Kilner, Miho Honda, and Yusaku TakitaView Author Information Department of Applied Chemistry, Faculty of Engineering Oita University, Dannoharu 700, Oita 870…
The hydrophilic/hydrophobic behavior of two silica polymorphs (a finely ground cristobalite and a pyrogenic amorphous Aerosil) was studied by means of adsorption microcalorimetry, as a function of nature and extension of the surface hydroxylated layer. Water and two alcohols (methanol and tert -butyl alcohol) were use…
Grey relational analysis makes use of relatively simple mathematical procedures to arrive at salient relationships in a complex system. It uses a relatively small amount of data and works with great variability in factors. Grey relational analysis was used to investigate the relationship between inhibitor structure an…
Minor spatial fluctuations on the pA scale in passive current density of type 304 stainless steel in dilute aqueous chloride solution are shown to relate directly to the subsequent initiation of pitting corrosion.
Confinement of a nematogen in submicrometer cavities can produce substantial effects on the nematic-isotropic phase transition and on order and orientation of the nematic phase. We combine the methods of C13- and H-NMR1 and broadband dielectric spectroscopy to probe liquid crystalline order and molecular mobility. We…
We report the observation of room-temperature and low-temperature visible photoluminescence from nanocrystalline silicon (nc-Si) thin films produced by plasma-enhanced chemical vapor deposition (PECVD) through a gas discharge containing SiH4 diluted in Ar and H2. The nanocrystalline silicon films were characterized us…
Acetyl-CoA synthetase (ADP-forming) is an enzyme in Archaea that catalyzes the formation of acetate from acetyl-CoA and couples this reaction with the synthesis of ATP from ADP and Pi (acetyl-CoA + ADP + Pi --> acetate + ATP + CoA) [Schifer, T., Selig, M. & Schonheit, P. (1993) Arch. Microbiol. 159, 72-83]. The enzyme…