Materials Literature
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Short-chain collagen was isolated from bovine and from human placenta after limited pepsin digestion. By reductive cleavage of disulfide bonds under non-denaturing conditions, mainly non-collagenous domains were cleaved off yielding a uniform component composed of three polypeptide chains with molecular masses between…
Atomistic simulation methods have been used to calculate the structures end energies of a series of 〈001〉 symmetrical tilt grain boundaries in NiO. The configurations studied were all coincident twin boundaries, but the relaxation displaces the two crystal halves from the perfectly coincident structure. The (n 10) bou…
The methyl-accepting chemotaxis proteins (MCPs) of Escherichia coli undergo reversible methylation that has been correlated with adaptation of cells to environmental stimuli. MCPI, the product of the tsr gene, accepts methyl groups at multiple sites that are located on two tryptic peptides, denoted K1 and R1. A second…
A piperidinyl nitroxide stable free radical derivative, TES, was tested as an NMR contrast enhancer of renal structures in normal animals and animals with experimentally induced unilateral renal ischemia, renal vascular congestion, and hydronephrosis. Physiologic measurements indicated that TES is rapidly excreted in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrocarbon functionalization by the (iodosylbenzene)manganese(IV) porphyrin complexes from the (tetraphenylporphinato)manganese(III)-iodosylbenzene catalytic hydrocarbon oxidation system. Mechanism and reaction chemistryJohn A. Smegal and Craig L. HillCite this: J. Am. Chem…
Chicken embryo skin of different ages and adult skin were labeled with antibodies against the amino propeptide and carboxyl propeptide of type I collagen and processed for indirect immunoelectron microscopy by the ferritin technique. The results indicate that the formation of thin collagen fibrils involves polymerizat…
On the basis of a lensless shadow-casting technique, a new, simple method of optically implementing digital logic gates has been developed. These gates are capable of performing a complete set of logical operations on a large array of binary variables in parallel, i.e., the pattern logics. A light-emitting diode (LED)…
The X-ray absorption spectrum of the Rh K edge of a highly dispersed reduced 0.57 wt % Rh/ y-A1203 catalyst\nshows EXAFS oscillations due to rhodium-rhodium nearest neighbors, which proves the existence of rhodium\nmetal crystallites. Adsorption of CO at room temperature on the reduced catalyst significantly decreases…
Zirconium is one of the few metals that resists attack by sulfuric acid up to 75% concentration. However, selective corrosion may be found in welds at somewhat lower concentrations of sulfuric acid. It is generally believed that iron in zirconium plays an important role in degrading zirconium’s corrosion resistance. Z…
Abstract Catalytic formation of oxygen from water was observed in the photosensitized reaction by trisbipyridineruthenium(II) using manganese dioxide as a redox catalyst and pentaammine chlorocobalt(III) as an electron acceptor in acidic solution. The β- and “activated” materials are found to be the most efficient and…
Microstructural changes associated with the tempering at 675°C of cast nickel–aluminium bronze, of nominal composition (wt-%) Cu–10Al–5Ni–5Fe, have been investigated using optical, electron optical, and microprobe analysis techniques. The tempering treatment resulted in the elimination of the non-equilibrium martensit…
Abstract A previously suggested simple relationship in a diagram of(Al 2 O 3 vs. MgO + FeO + Fe 2 O 3 ) opx for the distinction between igneous and metamorphic orthopyroxenes is shown to be inadequate. A revised diagram is presented and its limitations are discussed. A diagram showing Fe 2+ /(Fe 2+ + Mg) vs. 100Ca/(Fe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe alkaline electrolytic process for zinc production: a critical evaluationAlan P. Brown, Janet H. Meisenhelder, and Neng Ping YaoCite this: Ind. Eng. Chem. Prod. Res. Dev. 1983, 22, 2, 263–272Publication Date (Print):June 1, 1983Publication History Published online1 May 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of tetraoxotetrahydroxohexabismuth (III) perchlorate heptahydrate, Bi6O4(HO)4(ClO4)6.7H2O: an x-ray and neutron diffraction studyBengt SundvallCite this: Inorg. Chem. 1983, 22, 13, 1906–1912Publication Date (Print):June 1, 1983Publication History Published…
Fractional releases of silver and cesium from irradiated silicon-carbide-layered coated particles have been measured during isothermal anneals in the temperature range between 1273 and 1773 K. The release rates measured have been evaluated with the aid of a statistical numerical treatment based on a simple diffusion m…
Simple but accurate expressions for the total cross sections and energy-absorption cross sections for inelastic scattering of x rays from atomic, molecular, and condensed matter are developed. The starting point is the relativistic impulse approximation for Compton scattering of x rays. This gives the inelastic-scatte…
The diffusion coefficient of oxygen in α‐titanium was measured in the range 460°–700°C, by means of nuclear microanalysis from the reaction 16 O ( d , p ) 17 O * . A new application of this method allows the determination of a complete diffusion profile, along about 2 μm, from a single proton spectrum. The results pro…
Abstract A highly reactive cadmium deposit is formed, when colloidal cadmium sulfide is illuminated in the presence of sulfite or dithionite anions (10 −4 −10 −3 M). It is oxidized by oxygen, nitrous oxide, hydrogen ions and methylviologen. The quantum yield amounts to 0.005 in the absence of excess cadmium ions. In t…
A study by band-structure methods of the boron carbide B IaC 2 is presented. All symmetry directions are considered and it is found that, in general, the valence bands are flat in almost all directions - nowhere does a band width exceed 3 eV (1 eV = 1.60 x 10 -19 J). There is slightly greater curvature in the conducti…
Abstract Highly crystalline syndiotactic 1,2‐polybutadiene ( s ‐PB) having melting point (mp) up to 216°C was obtained by using a Co(acac) 3 ‐AIEt 3 ‐CS 2 catalyst. The polymer with mp 208°C was found to have 99.7% 1,2 content and 99.6% syndiotacticity by 1 H and 13 C‐NMR measurements. The s ‐PB can be molded by addit…