Materials Literature
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Abstract The yield of a nonpremixed series‐parallel reaction at complete conversion was measured in a turbulent, tubular‐flow reactor with single and multijet feeds. The yield of the intermediate decreased as mixing was slowed relative to the chemical kinetics, either by decreasing the Reynolds number, or by using a l…
Pyridoxal kinase has been purified 9000-fold from sheep brain. The purification procedure involves ammonium sulphate fractionation, DEAE-cellulose chromatography, affinity chromatography and Sephadex G-100 gel filtration. The final chromatography step yields a homogeneous preparation of high specific activity with a p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHelical twist and spontaneous polarization direction in ferroelectric smectic liquid crystals. 2J. W. Goodby and E. ChinCite this: J. Am. Chem. Soc. 1986, 108, 16, 4736–4742Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue…
This paper summarizes the stress and fracture analyses of a three‐layer ceramic composite which is a fundamental building block for the monolithic solid oxide fuel tell currently being developed at Argonne National Laboratory. A small difference in the coefficients of thermal expansion of different layers can result i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMutual diffusion in concentrated polymer solutions under a small driving forceC. J. Durning and M. TaborCite this: Macromolecules 1986, 19, 8, 2220–2232Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue 1 August 1986https:/…
Three different coadsorption structures of CO and oxygen over Pd(111) were analyzed through measurements of the intensity of LEED spots; separate domains of p(2×2)–O and ((3)1/2×(3)1/2)R30°–CO, closely contacted domains of ((3)1/2×(3)1/2)R30°–O with the same structure of CO, and also a mixed phase with (2×1) periodici…
Abstract— Synthesis of the tumor‐localizing preparation HPD (hematoporphyrin derivative) results in the formation of dimers and oligomers of hematoporphyrin joined by labile linkages. Studies with HPD and an HPD analog containing the chlorin analog of mesoporphyrin suggest the presence of two different linkages, eithe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHelical twist sense and spontaneous polarization direction in ferroelectric smectic liquid crystals. 1J. W. Goodby, E. Chin, T. M. Leslie, J. M. Geary, and J. S. PatelCite this: J. Am. Chem. Soc. 1986, 108, 16, 4729–4735Publication Date (Print):August 1, 1986Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoreceptor molecules. Synthesis of metalloreceptors containing porphyrin subunits and formation of mixed substrate supermolecules by binding of organic substrates and of metal ionsAndrew. Hamilton, Jean Marie. Lehn, and Jonathan L. SesslerCite this: J. Am. Chem. Soc. 1986, 1…
Endothelial seeding of vascular graft surfaces may lead to a less thrombogenic surface. We examined the feasibility of using microvessel endothelial cells derived from human fat for seeding purposes. Human fat was treated with collagenase for 24 minutes, washed, and purified in a Percoll gradient separation. This yiel…
Abstract— Sulfonated phthalocyanine and a series of its metal chelates in combination with red light irradiation led to the degradation of L‐tryptophan in oxygenated aqueous solution. The photoproducts and the rate of transformation of L‐tryptophan are compared with hematoporphyrin and rose bengal sensitized photooxid…
Strengths across the join between diffusion‐bonded Al 2 O 3 parts were evaluated in three‐point bending. Bond strengths as high as 60% of the alumina itself were achieved.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomogeneous precipitation of nickel as the dimethylglyoxime complex: revisitedJens. Hemmingsen, David. Larkin, and Thomas. MartinCite this: Anal. Chem. 1986, 58, 9, 2087–2088Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced cleavage of the carbon-indium bond in ethylindium(III) tetraphenylporphyrinMikio Hoshino, Hiroyuki Ida, Katsutoshi Yasufuku, and Kazunori TanakaCite this: J. Phys. Chem. 1986, 90, 17, 3984–3987Publication Date (Print):August 1, 1986Publication History Published…
β‐Ca 2 Si0 4 can be obtained from a mixture ofCaC 2 O 4 ‐H 2 O and amorphous silica by firing at 950°C as opposed to a normal sintering temperature around 1450°C. If CaCO 3 is used instead of CaC 2 O 4 ·H 2 O, four repeated firings under CO 2 atmosphere are needed to obtain β‐Ca 2 SiO 4 . The role of CO 2 atmosphere d…
Abstract Die physikalische Alterung von amorphen Polymeren wird ausgehend von experimentellen Ergebnissen auf phänomenologischem Niveau diskutiert, wobei die physikalische Alterung als selbständiger Relaxationsprozeß verstanden wird. Unter Benutzung einer allgemeinen Scalinghypothese wird ein konsistentes Bild für die…
Bimetal joints between high-speed steel and medium-carbon steel are often required in the tool industry. Friction welds were made between this dissimilar combination of materials and the joint behaviour was evaluated under conditions appropriate to the intended service applications. The welding was carried out under o…
Diffusion couples are used to study the reaction between CaO powder and Fe 2 O 3 All heat treatments were performed in air. The growth and morphology of calcium ferrites is studied at different temperatures. It is shown that CaO·2Fe 2 O 3 , starts to form at about 1125°C, while the accepted phase diagram for equilibri…
This-paper describes a procedure for HV insulating system design which combines the classical approach of changing the distances between system elements with optimization of their contours. An integral equation technique for solving electric fields, which is improved by cubic spline expansion for surface charge densit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structural characterization, and magnetic properties of vanadium(3+) dimer compounds. Neutron scattering and magnetic circular dichroism study of cesium chlorovanadate (Cs3V2Cl9) and rubidium bromovanadate (Rb3V2Br9)Bruno Leuenberger, Bernard Briat, Jean Claude Ca…