Materials Literature
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Solutions of polystyrene in toluene in the concentration range 0.1–1.0 g/ml have been examined using polarized Rayleigh–Brillouin scattering and dynamic light scattering. The purpose was to extend measurements to the hitherto little studied interval between semidilute solutions and the bulk polymer. The Brillouin shif…
Single crystals of mixed methyl-(2,4-dinitrophenyl)-aminopropanoate (MAP): 2-methyl-4-nitroaniline (MNA) have been grown from solution using a 40:60 mixture of ethanol and ethyl acetate. Formation of an equimolar complex is confirmed by x-ray diffraction studies. The complex crystallizes in the monoclinic space group…
A detailed morphological comparison between the narrow-spiked and the wide-spiked variants of Triticum dicoccoides growing in Israel revealed significant differences that became evident in almost all organs, both vegetative and reproductive, in juvenile and adult stages, on macro- and micro-morphological levels. Pheno…
With a view to evaluate the effect of non-mesogen or mesogen on the binary systems comprised of a nematogon or a polymesomorph, the present study was undertaken where the compounds have general structure (I): The binary systems are selected with variation in R and R′ (I). The binary phase diagrams have very interestin…
A process, which makes it possible for polyimide resists to be developed using dilute base aqueous solutions, is reported. The process contains soft bake, UV exposure, post exposure bake and development with basic aqueous solutions. The post exposure bake at a temperature range from 140 to 160°C, which is higher than…
Lys-258 of aspartate aminotransferase forms a Schiff base with pyridoxal phosphate and is responsible for catalysis of the 1,3-prototropic shift central to the transamination reaction sequence. Substitution of arginine for Lys-258 stabilizes the otherwise elusive quinonoid intermediate, as assessed by the long wavelen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCluster synthesis. 36. New platinum-ruthenium and platinum-osmium carbonyl cluster complexes from the reactions of the complexes Pt2M4(CO)18 (M = ruthenium, osmium) with cycloocta-1,5-diene in the presence of UV irradiationRichard D. Adams, Michael S. Alexander, Isam Arafa,…
A unified treatment of effective-medium theory for the dielectric constant and conductivity of a macroscopically inhomogeneous medium based on renormalization is presented. Our expression recovers in appropriate limits Bruggeman's unsymmetrical as well as symmetrical results. In addition, the same expression also desc…
Abstract Crystal data and results of structure refinements for MnSi are reported. The material is cubic, P2 1 3, with a = 4.5603(2) Å, V d = 94.84(1) Å 3 , Z = 4, D x = 5.815 Mg/m 3 . Intensity data were obtained from a Stoe transmission type diffractometer equipped with a position sensitive detector. CuKα 1 radiation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and polymerization of N-(4-vinylphenyl)maleimideTokio Hagiwara, Iwao Suzuki, Kazushi Takeuchi, Hiroshi Hamana, and Tadashi NaritaCite this: Macromolecules 1991, 24, 26, 6856–6858Publication Date (Print):December 1, 1991Publication History Published online1 May 2002…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic studies of ferric porphyrins with quantum mechanically admixed intermediate-spin states: models for cytochrome c'Elisabeth T. Kintner and John H. DawsonCite this: Inorg. Chem. 1991, 30, 26, 4892–4897Publication Date (Print):December 1, 1991Publication History P…
ABSTRACT We observed sexual reproduction in a clonal culture of Stephanodiscus niagarae Ehrenb. and used light and scanning electron microscopy to absent flagellated male cells, auxospore growth, initial valve structure and production, and subsequent daughter cell division. Free auxospores were spherical and nonsilice…
The birefringence of liquid-crystalline phases is the result of the parallel order of molecules exhibiting a polarizability anisotropy. The magnitude and sign of the birefringence are determined by the structure and order of the liquid-crystalline phase types as well as by the polarizability properties of the constitu…
The effect of crystallization on the lattice vibrations of two glass ceramics, a magnesium aluminosilicate (Corning Code 9606) and a lithium aluminosilicate (Corning Code 9623), is studied through measurements of the thermal conductivity and specific heat below 300 K. Because of grain boundaries and magnetic impuritie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of the distal para substituent through NH---S hydrogen bonds on the positive shift of the reduction potentials of [Fe4S4(Z-cys-Gly-NHC6H4-p-X)4]2- (X = H, OMe, F, Cl, CN) complexesRyotaro Ohno, Norikazu Ueyama, and Akira NakamuraCite this: Inorg. Chem. 1991, 30, 26…
We report the mapping, sequencing, and study of the physiological role of the fourth arabinose-inducible operon from Escherichia coli, araJ. It is located at 9 min on the chromosome and codes for a single 42-kDa protein that shows no significant homology to other known proteins. Destruction of the chromosomal araJ gen…
Elevated steel silos commonly consist of a cylindrical shell, a conical hopper, and a skirt. At the intersection of these shell segments, a ring is often provided to sustain the high circumferential compressive stress developed. The cone/cylinder/skirt/ring junction, known as the transition, may fail by plastic collap…
The interactions between the form of a barnacle aggregation, its flow environment, and the feeding behavior of each individual was determined in unidirectional flows; both models of barnacle aggregations and live barnacles were used. Hill-shaped aggregations of model barnacles captured significantly more particles tha…
The authors examine the effects of neutron irradiation on ferroelectric (FE) lead-zirconate-titanate (PZT) thin films. The data show only a slight loss in the FE switched charge, as measured by the hysteresis loops, up to 1*10/sup 15/ n/m/sup 2/. The retained polarization, as measured by a pulse technique, showed a la…
Die bereits von Woodward bei der Chlorophyll‐Synthese diskutierten Isophlorine sind als janusköpfige Moleküle ‐ einerseits Porphyrine ( N , N ′‐Dihydroporphyrine), andererseits echte Annulene (der Hückel‐Regel nicht entsprechende [20]Annulene) ‐ strukturchemisch von besonderem Reiz. Während NH‐unsubstituierte Isophlor…