Materials Literature
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Analyses on the effects of polymeric N-acetyl-D-glucosamine (chitin), which was obtained from squid pen, on histiogenic activation in dogs were carried out with subcutaneous implants (5 x 5 cm2) of polyester non-woven fabric (NWF) supplemented with chitin (chitin group) and NWF (control group). These materials were im…
From our research for novel non-linear optical (NLO) materials for frequency doublers and optical modulators we report on new ferroelectric liquid crystals, which for the first time, exhibit second order NLO coefficients (for example d 22 = 5 pm V−1, which are comparable to those of state of the art inorganic NLO mate…
Enzymatic ring-opening copolymerization of lactones was carried out by using Pseudomonas fluorescens lipase in bulk. In the copolymerizaton of ε-caprolactone (ε-CL) and δ-valerolactone at 60°C for 10 days a copolymer with molecular weight of 3.7×103 was obtained and its structure was found to be of random structure ha…
Cellulosic materials have long been used as cost-cutting fillers in the plastic industry. Among the various factors which determine the final performance of the composite materials depend, to a large extent, on the adhesion between the polymer matrix and the reinforcements, and, therefore, on the quality of the interf…
The microstructure development of a ceramic composite material fabricated by active‐filler‐controlled polymer pyrolysis (AFCOP) was investigated. During heating of a polysiloxane precursor mixed with titanium powder in argon atmosphere up to 1400°C, thermally induced decomposition of the polymer phase is combined with…
T. Okada, Analyst, 1993, 118, 959 DOI: 10.1039/AN9931800959
Description 31 papers cover three wide-ranging topics: • unique small and miniature specimens, as well as nondestructive, nonintrusive, and in-situ test techniques for measuring mechanicals and fracture properties • application of those techniques to assess irradiation-induced embrittlement • and actual examples of th…
Ultrafine powders of TiO2 have been prepared by combined hydrothermal H2O2 oxidation. H2O2 oxidation and gel formation were performed at room temperature. Hydrothermal treatment was carried out at 140 °C. Anatase powder was formed in distilled water and rutile powder was formed in 1.0 mol dm–3 nitric acid solution. DT…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of Cu-CuTCNQ-M devices using scanning electron microscopy and scanning tunneling microscopyJ. J. Hoagland, X. D. Wang, and K. W. HippsCite this: Chem. Mater. 1993, 5, 1, 54–60Publication Date (Print):January 1, 1993Publication History Published online1 May 2…
The dinucleating macrocycles H2Lm,n containing two 2,6-di(aminomethyl)-4-methylphenol entities combined through two alkane chains, (CH2)m and (CH2)n, at the amine nitrogens have been prepared for the (m,n) sets (2,3), (2,4), (2,5), (3,3) and (3,4). The dinuclear copper(II) complexes having general formula [Cu2Lm,n][Cl…
Amorphous phases have been prepared by melt spinning technique from the oxide samples having compositions 41.3 mol%SrO-41.3 mol%Fe2O3-17.4 mol%B2O3 (composition S) and 63.1 mol%SrO-19.4 mol%Fe2O3-17.5 mol%B2O3 (composition T). When these amorphous phases are heat-treated by heat treatment, SrO·6Fe2O3 crystal particles…
Isocitrate dehydrogenase (IDH) of Escherichia coli is regulated by phosphorylation and dephosphorylation. This phosphorylation cycle controls the flow of isocitrate through the glyoxylate bypass, a pathway which bypasses the CO2 evolving steps of the Krebs' cycle. IDH is phosphorylated at a single serine which resides…
The expression and purification of the rabbit muscle aldolase A (D-fructose 1,6-bisphosphate:D-glyceraldehyde-3-phosphate lyase, EC 4.1.2.13) from an expression plasmid in bacteria is described. The enzyme is produced in bacteria at a level of 300 mg/liter and is indistinguishable from the enzyme isolated from muscle…
The AC electromigration of multilayered interconnect systems consisting of TiW-AlSiCu and CVD W-AlSiCu is studied under stress of repetitive dual-pulse current waveforms at 2 MHz. By using a general AC waveform in which the peak current density of the first pulse j/sub 1/ is fixed and the second is varied from +j/sub…
The ionic and electronic conductivities of poly-[1-methyl-3-(pyrrol-1-ylmethyl)pyridinium perchlorate] have been measured as a function of potential in various solvents by impedance spectroscopy. The ionic conductivity of this polymer shows a strong solvent dependence, ranging from 0.31 mS cm–1 in water to 8.0 µS cm–1…
Specimens of breast milk were obtained from each breast in a lactating patient for a 24-hour period after a gadolinium-enhanced MR imaging examination was performed. A quantitative analysis of gadolinium content in specimens obtained at 2, 11, 17, and 24 hours after the intravenous administration of gadopentetate dime…
The X-ray structure of the new fully oxidized isopolyvanadate, (TMA)3H6VV15O42·2.5H2O 1(TMA = tetramethyl-ammonium), prepared by reaction of H2O2 with VOSO4·4H2O shows a bicapped Keggin structure with four-, five- and six-coordinate vanadium atoms; 51V NMR indicates that the same structure has considerable kinetic sta…
The fluorinated ethanols F(n)CH(3-n)CH20H (n = 0-3) form fluorinated ethoxides when adsorbed on oxidized Cu(111), Cu(110), Cu(100), and Ag(110) surfaces. The fluorinated ethoxides decompose at elevated temperatures by Beta- hydride elimination to yield fluorinated acetaldehydes. Inclusion of fluorine in the methyl gro…
Hydrogen silsesquioxane, (HSiO)8, T8, has been synthesized and isolated in synthetically useful quantities. The T8 cage-like structure allows eight pendant groups to be placed symmetrically about the surface of a sphere to form an ‘octopus’ molecule. Using T8 to hydrosilylate compounds with the formula CH2CH(X)nY, oct…
Abstract The structure of a dimeric Keggin-typed polyoxotungstate, [Ge2Ti6W18O77]14−, was investigated by X-ray diffractometry and 183W NMR spectroscopy. K9H5[Ge2Ti6W18O77]·16H2O crystallizes in triclinic a = 17.582(4), b = 22.139(5), c = 12.960(2) Å, α = 101.26(2), β = 94.07(2), γ = 109.20(2)°, V = 4622(4) Å3. The D3…