The Cell Surface Glycoprotein ofHaloarcula japonicaTR-1
Satoshi Nakamura, Rikizo Aono, Shin Mizutani, Tomonori Takashina, William D Grant, Koki Horikoshi; The Cell Surface Glycoprotein of Haloarcula japonica TR-
Materials Literature
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Synthesis and characterization of poly(siloxane‐urethane)s
Abstract A series of polyurethane block copolymers based on hydroxy‐terminated polydimethylsiloxane and poly(propylene glycol) soft segments of molecular weights 1818 and 2000, respectively, were synthesized. The hard segments consisted of 4,4′‐diphenylnethane diisocyanate and 1,4‐butanediol as the chain extender. Sam…
MgCl2‐supported Ziegler‐Natta catalysts: Synthesis and X‐ray diffraction characterization of some MgCl2‐Lewis base adducts
Abstract Some adducts of MgCl 2 and Lewis bases (or donors) B were examined, having a composition MgCl 2 · 2B, where B = Ethyl (Et) formate, Et acetate, Et propionate, Et benzoate, Et crotonate, acetone, 2‐butanone and EtOH. The crystallographic investigation of these adducts, carried out on polycrystalline powders an…
The optical spectra of copper ions in alkali-lime-silica glasses
It has been shown that the position of the cupric band is affected very little either by changing the silica: soda ratio or by changing the time content while keeping the silica:soda ratio constant in the molar composition range 14.7-22Na 2 O, 12-20CaO, 66-73.3SiO 2 however, it shifts to a shorter wavelength as soda i…
Remarks on symmetries occurring in the sodalite family
Structural distortions which result in symmetry reduction in the sodalite family are discussed. Several observed symmetry reduction pathways are presented in terms of group-subgroup relationships, as well as with the help of irreducible representations. Emphasis is given to aluminate sodalites, which are characterized…
Electrochromism in the transition-metal phthalocyanines. Part 3.—Molecular organisation, reorganisation and assembly under the influence of an applied electric field. Response of [Fe(pc)] and [Fe(pc)Cl]
The electrochromic behaviour of α-[Fe(pc)] and [Fe(pc)Cl] has been studied, using cyclic voltammetry, electronic absorption spectroscopy and Mössbauer spectroscopy, the latter on 57Fe-enriched [Fe(pc)] films. [Fe(pc)] films have been shown to cycle reversibly ca. 103 times between neutral (blue) and reduced (purple-re…
Catalytic β-stereospecific epoxidation of unsaturated steroids by trans-dioxoruthenium( VI )tetramesitylporphyrin. Stereochemical grounds for the β-diastereofacial selection
The catalytic epoxidation by dioxygen with trans-dioxoruthenium(VI)tetramesitylporphyrin [Ru(O)2(tmp)] of the acetic esters of cholesterol, 3-epicholesterol and isocholesterol,† as well as of the 7α-epimer of the latter, is β-stereospecific. Substitution by a methyl group on C-6 of pregnenolone acetate results in redu…
The first example of a mono-helical complex of 2,2′: 6′,2″:6″,2‴:6‴,2â�—:6â�—,2â�—′-sexipyridine; preparation, crystal and molecular structure of bis(nitrato-O,O′)(2,2′: 6′,2″:6″,2‴:6‴,2â�—:6â�—,2â�—′-sexipyridine)europium( III ) nitrate
The hexadentate ligand 2,2′ : 6′,2″:6″,2‴:6‴,2â�—:6â�—,2â�—′-sexipyridine (spy) forms double-helical binuclear complexes with transition metals, but 1:1 complexes with lanthanides; the photoactive complex [Eu(spy)(NO3)2][NO3] is obtained from the reaction of spy with europium(III) nitrate and has been structurally cha…
Studies of cation dopant sites in metal oxides by EXAFS and computer-simulation techniques
A combination of extended X-ray absorption fine structure (EXAFS) experiments and computer simulations has been used to probe the environments of cation dopants in three oxide systems of technological importance, viz. lithium niobate (a material with applications in non-linear optics), tin oxide (a component in some t…
Computation of transition and molecular diffusivities in fibrous media
Abstract The tortuosities of fibrous media in the heretofore unexplored transition and ordinary regimes are computed using a Monte Carlo scheme based on the Einstein equation for random walkers. The model structure is that of fully penetrable cylinders (FPC) in a unit simulation volume. The mean square displacement te…
The 5f→6d absorption spectrum of Pa4+/Cs2ZrCl6
The 5f1→6d1 absorption spectrum of 231Pa4+ diluted in a single crystal of Cs2ZrCl6 has been measured at 4.2 K. Three bands corresponding to the 6d(Γ8g, Γ7g, and Γ′8g ) levels are assigned. Extensive vibronic structure has been observed for the lowest 5f→6d transition and this structure is compared to that recently rep…
Joining of Silicon Carbide/Silicon Carbide Composites and Dense Silicon Carbide Using Combustion Reactions in the Titanium–Carbon–Nickel System
A new ceramic joining technique has been developed that utilizes an exothermic combustion reaction to simultaneously synthesize the joint interlayer material and to bond together the ceramic workpieces. The method has been used to join SiC/SiC composites and dense SiC ceramics using TiC‐Ni powder mixtures that ignite…
Low-temperature dry etching of metal oxides and ZnS via formation of volatile metal β-diketonate complexes
The reactions of CuO, PbO, ZnO, ZnS, V2O5, PbTiO3, PbZrO3, and YBa2Cu3O7–x, with 1,1,1,5,5,5-hexafiuoroacetyl-acetone result in formation of the corresponding metal β-diketonates with etch rates of 1 µm min–1for mixed copper(I)/(II) oxide films.
Experimental approach to elucidate the mechanism of ultrasound-enhanced polymer erosion and release of incorporated substances
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental approach to elucidate the mechanism of ultrasound-enhanced polymer erosion and release of incorporated substancesL. S. Liu, J. Kost, A. D'Emanuele, and R. LangerCite this: Macromolecules 1992, 25, 1, 123–128Publication Date (Print):January 1, 1992Publication His…
Conducting polypyrrole particles dispersible in both aqueous and non-aqueous media
Dispersion polymerization of pyrrole in absolute alcohol or water–alcohol mixtures using poly(vinyl methyl ether)(PVME) dispersant and FeCl3 initiator–dopant yields conducting polypyrrole (PPy) particles which after isolation and purification can be redispersed in water as well as in many common organic solvents to gi…
X-ray Photoelectron Spectroscopy Study of Anion Bonding in Tin(II) Fluorophosphate Glass
We have used x-ray photoelectron spectroscopy to examine the structural environments of F and O in several series of SnF 2 -SnO-P 2 O 5 glasses. The F 1s spectra indicate that F is incorporated primarily in F-P bonds in glasses containing 40 and 50 mol% P 2 O 5 , whereas F-Sn bonds coexist with F-P species in glasses…
The Infrared Spectra (4000–50 cm−1) of Complexes of 2,2′-Bipyridine, 1,10-Phenanthroline and their Perdeuterated Analogues with Metal(II) Perchlorates of the First Transition Series
A full infrared assignment (4000 to 50cm−1) for [M(bipy)3](ClO4)2 and [M(phen)3](ClO4)2 (M = Mn, Fe, Co, Ni, Cu, Zn; bipy = 2,2′-bipyridine, phen = 1,10-phenanthroline) and their fully deuterated analogues is presented. Several ligand bands show metal sensitivity in both series of complexes, but less so with phen. In…
An efficient single crystal BSE detector in SEM
Abstract Using the optical modifications described, the signal of the wide‐angle BSE detector can be increased 3.7‐fold compared with the detector type illustrated in Figure 1. The increase was achieved by more fully exploiting the optical phenomena of diffusion, reflection at the critical angle and antireflection, an…
Isolation of highly nucleophilic gold(I) alkoxides having a tertiary phosphine ligand
Alkoxogold(I) complexes having a tertiary phosphine ligand, Au(OR)L [R = CH2CF3, CH(CF3)2; L = PPh3, PCy3] have been synthesized by the metathetical reactions of chloro(tertiary phosphine)gold(I) and potassium fluorinated alkoxides in tetrahydrofuran at room temperature.
Anionic polymerization of 4‐methyl‐2‐oxetanone (β‐butyrolactone)
Abstract Polymerization of 4‐methyl‐2‐oxetanone ( 1 ) initiated with potassium acetate‐dibenzo‐18‐crown‐6 complex ( 2 ) in THF as solvent, was studied. Transfer reactions, leading to both crotonate anions and carboxylic acid formation, have been observed. Two kinetic effects of these reactions, hampering the living po…