Antioxidative Activity of Porphyrin Derivatives
Antonius Herry Cahyana, Yoshihiro Shuto, Yoshiro Kinoshita; Antioxidative Activity of Porphyrin Derivatives, Bioscience, Biotechnology, and Biochemistry, V
Materials Literature
文献浏览
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。
Surface structure determination of thin films of benzimidazole on copper using surface enhanced Raman spectroscopy
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface structure determination of thin films of benzimidazole on copper using surface enhanced Raman spectroscopyMary L. Lewis, Lars Ledung, and Keith T. CarronCite this: Langmuir 1993, 9, 1, 186–191Publication Date (Print):January 1, 1993Publication History Published onlin…
Elevated‐Temperature Behavior of High‐Strength Silicon Carbide
The room‐ and high‐temperature mechanical properties or a high‐strength, sintered silicon carbide were evaluated Room‐temperature strength was measured in four‐point bending. The room‐temperature fracture toughness was determined using a precracked single‐edge‐notched beam (SENB) bridge indentation technique. The high…
Creative Use of Bearing Steels
Description 23 papers written by internationally renowned scientists and engineers cover: • Heat Treatment: Carburizing and Through-Hardening • Surface Modification • Powder Metallurgy • Corrosion Resistant Bearing Steels • New Bearing Steels • Improvement of Rolling Contact Fatigue Life • New Bearing Steel Making Pro…
Combustion synthesis, characterization, sintering and microstructure of cordierite
Cordierite powders have been obtained by the combustion of aluminum nitrate, magnesium nitrate, magnesium oxide, silica fume, ammonium nitrate, and urea mixtures. The thermal evolution of crystal phases has been studied using X-ray diffraction patterns and IR spectra. Magnesia derived cordierite attained 97% theoretic…
Polymorphism of Tegafur: Physico-chemical Properties of Four Polymorphs.
Four crystalline forms of tegafur were prepared by recrystallization from different solvents (α-, β-, δ-forms) and by heating (γ-form). They have been characterized using powder X-ray diffraction, thermal analysis, microscopy, density measurements and infrared spectroscopy. From differential scanning calorimetry measu…
Rumbrin, a new cytoprotective substance produced by Auxarthron umbrinum. II. Physico-chemical properties and structure determination.
The structure of rumbrin (Fig. 1), a new cytoprotective substance, was elucidated by NMR spectral analysis. Rumbrin was found to possess a novel skeleton containing alpha-pyrone, tetraene and pyrrole moieties.
Gas phase oxidation of benzene to phenol using Pd–Cu composite catalysts. Part 2. Performance of CuSO 4 -based catalysts
Gas phase oxidation of benzene to phenol has been studied using Pd–Cu composite catalysts which were prepared mainly by impregnating the respective metal salts on silica gel. If one of the two metal species is absent from the catalyst, no catalytic activity is observed. Good performance is obtained with catalysts havi…
Photoluminescence of layered alkali-metal titanates (A2TinO2n+1, A = Na, K) at 300 and 77 K
The photoluminescence of the layered titanates, K2Ti2O5, Na2Ti3O7, and K2Ti4O9 has been investigated. K2Ti2O5 showed a strong blue luminescence at room temperature. The luminescence of K2Ti2O5 was strongly affected by water intercalation and H+ exchange.
Comparison of measured wetting behaviour of materials with identical surface energies, presented as particles and plates
Contact angles have been obtained for four different liquids on surfaces of particles and plates coated with three different polymers, to give three different surface energies. The advancing contact angles on flat plates measured by the sessile drop and Wilhelmy plate methods were in very close agreement (ca 1°) over…
Glass formation in organic binary liquids studied using differential scanning calorimetry
Differential scanning calorimetric (DSC) studies have been performed on binary mixtures of organic liquids at temperatures down to 100 K over the entire concentration range. The liquids investigated are simple liquids such as chlorobenzene and bromobenzene in cis-decalin and o-terphenyl. All the binary liquids exhibit…
Highly thermostable, porous, layered titanoniobate pillared by silica
The first silica-pillared titanoniobate has been prepared by firstly intercalating layered titanoniobate with NH2(CH2)3Si(OEt)3 and subsequently thermally removing the interlayered organics, the resulting pillared material is porous and has a high thermal stability beyond 750 °C.
Cuo–ZnO–Al 2 O 3 mixed oxides: preparation, bulk and surface characterization
CuO–ZnO–Al2O3 mixed oxides with different Cu : Zn : Al atomic ratios were obtained by thermal decomposition of hydroxycarbonate) precursors at 623 K in air for 24 h. Both precursors and mixed oxides were characterized by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectrosco…
pH Tolerance and Metal Toxicity in Populations of the Planktonic DiatomAsterionella: Influences of Synthetic and Natural Dissolved Organic Carbon
Two clones of Asterionella ralfsii cf americana Körn. were more tolerant of acidic pH with respect to batch culture growth rate than their congener, A. formosa Hass. The relative inability of A. formosa to satisfy trace metal requirements at lower pH appeared to be a major factor in its reduced tolerance of acidic con…
Synthesis and structure of new hosts related to 9,9′-bianthryl
The molecular structures of 10,10′-biacridinyl-9,9′-dione (5), 9-(10′-bromo-9′-anthryl)carbazole (9) and 9,9′-bicarbazyl (12) have been solved by X-ray crystallography. Proton and carbon-13 NMR studies of these and related compounds, show that in solution their conformations are also ‘scissor-like’. AM1 semi-empirical…
Impurity Diffusion and Isotope Effect of Cobalt in α-Iron
Impurity diffusion and the isotope effect of cobalt in α-iron have been studied by a serial radio-frequency sputtermicrosectioning method with radioactive tracers 57Co and 60Co in the temperature range 859 to 1173 K. Larger influence of the magnetic spin ordering on the diffusion of cobalt than that on the self-diffus…
Multi-mode chemical transducers. Part 2. Electrochromic and photochromic properties of azoquinone compounds
Several molecules having multiple regions independently responsive to stimulations have been investigated. A 2-(4-methoxyphenylazo)anthraquinone (1) having both an electrochromic quinone group and a photochromic azo group has been synthesized and its electrochromic and photochromic properties investigated. It shows in…
Pulse corona characteristics
Experiments carried out to describe the corona occurring in wire-cylinder geometries due to short voltage pulses of positive polarity, and to assess the influence of corona current and on the energy associated with each pulse of both the electrode geometry and the voltage waveshape are reported. The experimental setup…
XAFS and thermogravimetry study of the sintering of calcium supported on carbon
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXAFS and thermogravimetry study of the sintering of calcium supported on carbonD. Cazorla-Amoros, A. Linares-Solano, C. Salinas-Martinez de Lecea, H. Yamashita, T. Kyotani, A. Tomita, and M. NomuraCite this: Energy Fuels 1993, 7, 1, 139–145Publication Date (Print):January 1,…
Inhibition of hydroxyapatite formation in aqueous solutions by zinc and 1,2-dihydroxy-1,2-bis(dihydroxyphosphonyl)ethane
The kinetics of crystal growth of hydroxyapatite [Ca5(PO4)3OH, HAP], the thermodynamically most stable calcium phosphate phase, at 37 °C, pH 7.4 and ionic strength 0.1 mol dm–3 has been investigated. The kinetics results showed a surface-controlled spiral growth mechanism. The presence of 1,2-dihydroxy-1,2-bis(dihydro…