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。
Highly faceted, regular, lathlike lamellar single crystals of syndiotactic polypropylene (s-PP) fractions have been investigated through transmission electron microscopy (TEM), atomic force microscopy (AFM), and electron diffraction (ED). Single crystals of s-PP over 1 μm in size can be grown from the melt in thin fil…
The electrochemistry and spectroelectrochemistry of (TPPBr(x)())FeCl (TPPBr(x)() is the dianion of beta-brominated-pyrrole tetraphenylporphyrin and x = 0-8) were examined in PhCN containing tetra-n-butylammonium perchlorate (TBAP) as supporting electrolyte. Each compound undergoes two reversible to quasireversible one…
Following the characterization of polyoxypregnane esters and esterified glycosides from the less polar extracts of Leptadenia hastata, 34 new congeners have been isolated from the more polar extracts. They possess sarcostin or deacetylmetaplexigenin as the aglycons and acetyl, benzoyl, cinnamoyl, nicotinoyl, and m -hy…
In this study, a tubular hybrid vascular tissue composed of vascular cells and collagen was implanted as a venous substitute, and its remodeling process was histologically investigated. First, a hybrid medial tissue was prepared by pouring a cold mixed solution of canine jugular smooth muscle cells (SMCs) and Type I c…
In the Leibler description of copolymer systems containing only two kinds of monomers, the state of the system is described by one order parameter, ψ( r ), representing the deviation of the local composition from the space-averaged value. The Landau free energy is expanded up to fourth order in powers of ψ( r ) and su…
Freeze-fracture electron microscopy was used to characterize the microstructure of a novel multivesicular liposome (MVL) currently under investigation as a depot-type drug delivery vehicle. The interior of the MVL includes bilayer-enclosed, water-filled compartments surrounded by an encapsulating outer membrane. The c…
The in vitro antibacterial effect of the combination of various polyoxometalates with beta-lactam antibiotics on methicillin-resistant Staphylococcus aureus (MRSA) strains is investigated by the use of both the National Committee for Clinical Laboratory Standards (NCCLS) disk method and the agar dilution method. Keggi…
Galena oxidation was investigated by AFM in acetate buffer under potentiostatic control and by photoelectron spectroscopy on potentiostatically pretreated specimens. At +236 mV (SHE) formation of sulfur protrusions could be observed with AFM. XPS showed the formation of elemental sulfur to start at potentials more ano…
29 Si NMR is used to quantify the polymerization kinetics of silicon alkoxide intermediates in acidic sol−gel processes well before gelation. Reaction conditions are chosen (a) to minimize interference by hydrolysis kinetics and differing degrees of hydrolysis and (b) to investigate the possibility of single-step copo…
Surfaces of medical grade silicone rubber (Q7-4750, Dow Corning) were modified by repeated (six times) RF plasma treatments using various discharge gases: oxygen, argon, carbon dioxide, and ammonia. The treated samples were stored for a period of 3 months in ambient air, water, or liquid nitrogen. Subsequently, the te…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEfficient Photochemical Oxygenation of Cyclohexene with Water as an Oxygen Donor Sensitized by Dimethoxy-Coordinated Tetraphenylporphyrinatoantimony(V)Tsutomu Shiragami, Kyouichi Kubomura, Daisuke Ishibashi, and Haruo InoueView Author Information Department of Industri…
The title compound [NEt4]3[WOS3(CuI)3(µ2-I)]· H2O has been synthesized by the reaction of (NH4)2WO2S2, CuI and Et4NI. Single-crystal X-ray diffraction data show that the anionic cluster [WOS3(CuI)3(µ2-I)]3– has a half-open cage structure. Non-linear optical (NLO) properties of the cluster were investigated with a puls…
The specific epithet of Halobacterium salinarium is a grammatically incorrect form for the genitive of salinae (salt works). Therefore, we propose that the name of the type species of the genus Halobacterium should be changed to Halobacterium salinarum nom. corrig. This species includes strains often designated Haloba…
The rheology and microstructure of aqueous dispersions containing Mg–Al layered double hydroxides (LDHs) are considered. The thickening and gelling of such dispersions can be controlled by the addition of electrolyte or, within a certain composition range, by the application of shear. In addition to electrolyte and LD…
A new series of bis-macrocyclic bola-amphiphiles were prepared, and their transport activities in vesicle and planar bilayer membranes were evaluated. From vesicle experiments, the apparent kinetic order in transporter indicates that aggregates are the kinetically active species. Step-conductance changes observed in p…
Differential thermal analysis is used to examine the kinetics of nucleation associated with the melt phase crystallization of n -alkanes in the homologous series C 13 H 28 to C 32 H 66 . Crystallization studies from stagnant melt samples reveal a direct correlation between structural type and nucleation behavior, nota…
A thermotropic dialkoxy biphenyl liquid crystal, functionalized by a carboxylic acid group at one extremity, is mixed to varying proportions with poly(4-vinylpyridine) (P4VP). The liquid crystal, LC-4,6A, is characterized by a monotropic smectic A phase and a highly ordered or crystalline lamellar phase formed primari…
A novel soluble tetranuclear copper(I) cluster containing an unsubstituted μ 4 -selenido moiety, [Cu 4 (μ-dppm) 4 (μ 4 -Se)] 2+ ( 1 ), has been synthesized and characterized by X-ray crystallography. Its photophysical and electrochemical properties have been studied. It is envisaged that the emissions of 1 are associa…
Silole–pyrrole co-oligomers (containing up to nine rings) are synthesized and found to have long UV–VIS absorption maxima in spite of their twisted structures.
Heat capacity spectroscopy measurements in the frequency range from 1.25 to 12 600 rad/s at the dynamic glass transition in poly(vinyl acetate) are reported. The data are compared to results of dielectric and shear spectroscopy in a comparable frequency range on the same sample. The peaks of the different imaginary pa…