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。
The physicochemical properties of a calcium-binding protein (CaBP) isolated from rat liver cytosol was investigated. Isoelectric focusing in a polyacrylamide gel plate using the Broad pI Calibration Kit showed that the isoelectric point is 5.20. The ultraviolet (UV) absorption spectrum of CaBP showed a maximum at 278…
In order to make a quantitative description of the plastic deformation of polycrystalline alloys governed by the stress induced martensitic transformation (SIM), the condition of yield by SIM is formulated for multiaxial stress states. The relation between the plastic strain of a crystallite and the volume fractions o…
Pulsed-dye laser excitation and lifetime spectroscopy of the 7F0----5D0 transition of Eu3+ reveals details of the binding of this ion to the calcium-binding sites of calmodulin (labeled I-IV, starting at the N-terminus). For 10 microM calmodulin Eu3+ binds quantitatively at sites I and II and more weakly at sites III…
Dihydroxysilicon(IV) octakis(dodecyloxymethyl)phthalocyanine forms columnar liquid crystal at temperatures ranging from –7 °C to more than 300 °C; polycondensation occurs in the mesophase to yield a series of polysiloxanes which lead to a lamellar liquid crystalline phase.
In the case of multistable anchorings, the selection between competing anchoring directions must be achieved. Using as an example the spreading of nematics droplets on SiO films evaporated under oblique incidence, we show that this selection is accomplished during the wetting of the substrate by the nematic. We analys…
The high-resolution 29Si- and 27Al-NMR spectra and ESR spectra for five allophanes (SiO2/Al2O3=1.19, 1.22, 1.75, 1.77 and 1.90) are reported, together with the spectra for two imogolites (SiO2/Al2O3 = 0.96 and 1.0) and a halloysite (SiO2/Al2O3 = 2.0). It is apparently seen that 29Si-NMR spectra for allophanes vary dep…
The modification of the Penrose tiling into a periodic structure is considered. Detailed analysis of the strip method and the dual transformation which yield approximants of the perfect tiling is presented in such a way that a complete classification of approximants is provided. The defects introduced to change the ap…
Abstract The mean crystal size of coarse crystalline products is determined by secondary nucleation and crystal growth. Secondary unclei are mainly produced by contacts of crystals with parts of the crystallizer or with other crystals. As a consequence, attrition effects are very important. In this paper, a model is p…
Compounds Cu(pcpci)Cl (1) and Cu(pcpci)Br (2)[pcpci =N-(2′-pyridylcarbonyl)pyridine-2-carboximidate] are isostructural and crystallize in the monoclinic space group Pc with two formula units in cells of dimensions [(1)/(2)]: a= 3.963(2)/3.888(3), b= 8.48(3)/8.641(3), c= 18.21(12)/17.944(11)Å, and β= 94.9(2)/92.63(6)°.…
A novel silver–copper anionic cluster [Ag6Cu7(C2Ph)14]– has been synthesized from the reaction of [PhC2AgC2Ph]– and a mixture of [AgC2Ph]n and [CuC2Ph]n; its structure constitutes a central linearly co-ordinated copper atom linked through Cu–Ag interactions to three tetranuclear [Ag2Cu2(C2Ph)4] subclusters, and within…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetrakis(1,3-dithiol-2-ylidene)cyclopentanone: a new electron donor with remarkably low oxidation potentialToyonari. Sugimoto, Yohji. Misaki, Yoshihisa. Arai, Yukishi. Yamamoto, Zenichi. Yoshida, Yasushi. Kai, and Nobutami. KasaiCite this: J. Am. Chem. Soc. 1988, 110, 2, 628…
Studies have been performed to evaluate both the relative amounts and molecular forms of the collagens synthesized by an established line of cultured rat kidney epithelial (clone NRK52E) cells. The collagens secreted into the culture medium and extracted from the cell layers of cultured NRK52E cells were isolated afte…
We present a method for the quantification of the contrast agent iohexol in serum. Iohexol is deiodinated by alkaline hydrolysis and the released iodine subsequently measured according to the ceric arsenite method. The assay requires 50 microliters of serum and has a high capacity as it involves few analytical steps.…
The polypeptide chain of an enzyme is folded so that the necessary functional groups are brought together in the active site. Conformational changes may disrupt this arrangement and cause loss of enzymic activity. The effect of soluble additives on the unfolding process is discussed. Additives may be classified as sub…
The oxidation of L-alanine by permanganate ion in aqueous phosphate buffers is autocatalysed by the inorganic reaction product, a solube form of colloidal manganese dioxide temporarily stabilized in solution by adsorption of phosphate ion on its surface. The rate of the non-catalytic reaction pathway is first-order in…
Anhydrous citric acid and sodium bicarbonate were granulated with ethanol in an extruder. The influence of the following process variables on intragranular porosity and liquid saturation was investigated: powder flow rate, ethanol concentration, screw speed, die plate and screw configuration.Granule porosity was signi…
The X-ray crystal structure of NH4[Ni{S2C2(CN)2}2]·H2O has revealed that the planar [Ni{S2C2(CN)2}2]– anions form an eclipsed equidistant stack structure with a repeat distance of 3.918(8)Å. At 98 K the repeat distance in the stack direction is double that at room temperature indicating that the anions are now associa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidative additions and luminescence involving iridium-gold-iridium chains formed by binding of gold(I) to the metallamacrocycle Ir2Cl2(CO)2[.mu.-Ph2PCH2As(Ph)CH2PPh2]2Alan L. Balch, Jeffrey K. Nagle, Douglas E. Oram, and Philip E. ReedyCite this: J. Am. Chem. Soc. 1988, 110…
Abstract The block copolymer poly(ethylene succinate)‐b‐poly(ethylene glycol) gave fibres that degrade rapidly and no tensile strength remained after 10 days of degradation, whereas fibres of the block copolymer poly(ethylene succinate)‐b‐poly(tetramethylene glycol) degraded more slowly and the tensile strength was lo…
ЗОННЫЙ МЕТАМАГНЕТИЗМ Р. 3. Левитин, А. С. МаркосянСОДЕРЖАНИЕ 1. Введение . . . . . . . . .