Materials Literature
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Abstract Structure of Bombyx mori silk fibroin membrane insolubilized with methanol, especially in the swollen state, is studied by means of spin‐label ESR, 13 C‐NMR, and FT‐IR (ATR method) spectroscopies. FT‐IR data indicate that the conformational transition from random coil to antiparallel β‐sheet occurs at the sur…
Sea urchin skeletal elements are composed of single crystals of calcite. Unlike their synthetic counterparts, these crystals do not have well-developed cleavage and are consequently much more resistant to fracture. This phenomenon is due in part to the presence of acidic glycoproteins occluded within the crystals. By…
Abstract The NMR relaxation time T1 of 1H and that of 19F were determined for polypyrrole and polythiophene doped with trifluoromethanesulfonate (triflate) or perchlorate ions. The 1H T1 is governed by the paramagnetism of the polymer chains. The 19F T1 of the triflate ions is explained by the combined effect of the F…
Abstract The theory of light‐scattering intensities originally discussed by Fleury and developed recently by the present authors for LaP 5 O 14 was applied to the second‐order ferroelectric phase transition in tris(sarcosine)calcium chloride, (CH 3 NHCH 2 COOH) 3 CaCl 2 · It was found that the combination of critical…
Abstract Vulcanization by peroxide and sulfur are the two common methods to crosslink diene elastomers. Crosslinks using peroxide are simple carbon-carbon covalent bonds, whereas, with sulfur, a distribution of sulfur linkages, S x , of various rank, x , may be present. Networks in which x=1 exclusively are said to be…
Modeling was carried out on vapor-liquid equilibria of nitric acid containing highly concentrated fission product nitrates to simulate the evaporation characteristics of a reprocessing plant high-level liquid waste (HLLW) concentrator. Results obtained with the model verified its reliability for prediction of vaporliq…
Abstract New dioxygen molybdenum porphyrins were formed by the introduction of dioxygen into the toluene solutions of oxomolybdenum(IV) porphyrins, MoIVO(tpp) and MoIVO(oep), around −70 °C. By raising the temperature to 25 °C, or by the photoirradiation of the solutions with the wavelength of the Soret bands, the pare…
Abstract [3‐ 13 C]‐Ethyl farnesoate was prepared by alkylating 3‐ 13 C‐ethyl acetoacetate with geranyl bromide, followed by hydrolysis, decarboxylation and treatment with the anion of triethyl phosphonoacetate. The ester was reduced with LAH, brominated with CBr 4 /ϕ 3 P, and the farnesyl bromide coupled with CuI/Li‐p…
Constant elongation rate tests and constant load, subcritical crack growth tests were used to investigate the stress corrosion cracking (SCC) susceptibility of metastable (type 301 [UNS(1) S30100]) and stable (type 310S [UNS S30108]) austenitic stainless steels in H2SO4/NaCl aqueous solutions at 25°C. For annealed typ…
Abstract The passivation behaviour and pitting corrosion of a commercial grade α‐brass (Cu/Zn:63/37) in neutral buffer solutions (borate and phosphate) in the presence and absence of chloride ions were investigated by electrochemical techniques. The results indicated the dezincification in absence of chloride ions at…
(N(CH3)4)2ZnBr4 undergoes a ferroelastic phase transition from an orthorhombic mmm structure to a monoclinic 2/m phase. Birefringence and optical indicatrix rotation about the monoclinic axis have been measured in the ferroelastic phase and their temperature dependences have been related to the order parameter of the…
Abstract Raman spectra of CsI3 and Cs2I8 crystals were measured for the samples whose structures were carefully examined. The surface of Cs2I8 samples was found to turn into CsI3 when they were kept in air. The heating effect of laser irradiation was shown to change the spectra of Cs2I8 samples to those of CsI3. These…
Article Microstructure and Properties of As-Cast Intermetallic Mg2Si-Al Alloys / Microstructure and Properties of As-Cast Intermetallic Mg2Si-Al Alloys was published on November 1, 1990 in the journal International Journal of Materials Research (volume 81, issue 11).
Square holes observed in the walls of the pennate diatoms may be due to cubic crystals inside the silicalemma that interfere with silica deposition, or cause its dissolution shortly after deposition. Their presence is consistent with models of valve morphogenesis by diffusion limited precipitation of amorphous silica…
(1990). Liposomes In Vivo: Prospects for Liposome-Based Pharmaceuticals in the 1990s. Biotechnology and Genetic Engineering Reviews: Vol. 8, No. 1, pp. 279-318.
Special attention is paid to the basic developments of the theory, the controversial «second frequency spectrum» of Timoshenko beams, cases of non-uniform cross section, presence of rigid masses, realistic end constraints, computer-oriented solutions, dynamic stability situations, and presence of elastic foundations
The strain dependence of tensile and compressive elastic moduli in carbon fibre/epoxy resin unidirectional and multidirectional composites is presented. Examined composites were made from prepregs supplied by two producers. Values of relative varia tions of modulus with unit strain are given. All of the examined compo…
Frustules of Mastogloia smithii from the Rabenhorst collection were studied in light and scanning electron microscopy. The valvocopula is composed of three elements: the band-like pars exterior, the septum, and the partectal ring, which contains a porous intrapartectal cylinder similar to that of Mastogloia grevillei…
The Sgs-3 gene of Drosophila melanogaster exhibits a tightly regulated pattern of expression governed by two functionally equivalent elements within 1 kb of the gene, each of which is sufficient to confer third-instar salivary gland-specific transcription. In this report we describe a detailed functional analysis of o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared, magnetic, Moessbauer, and structural characterization of perrhenato(tetraphenylporphyrinato)iron.cntdot.tolueneLaNelle Ohlhausen, David Cockrum, Jay Register, Kent Roberts, Gary J. Long, Gregory L. Powell, and Bennett B. HutchinsonCite this: Inorg. Chem. 1990, 29,…