Materials Literature
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Pulse radiolysis and flash photolysis-initiated one-electron oxidation of 3,4-dihydroxyphenylalanine (dopa) and other catecholamines have allowed the direct measurement of the kinetics of semiquinone disproportionation leading successively to the corresponding melanin precursors dopaquinones and dopachromes.
The result of subjective finger-pressure assessments of fabric softness are compared with objective measurements of compression. Good correlation between them is reported for a set of non-woven and a set of woven fabrics. Relations between the touch, compressibility, mass, thickness, density, and specific volume of th…
Solid-state polymorphic transformations can have a profound influence on the processing and storage of some crystalline powders. Using classical models of nucleation and growth a framework is developed which highlights the importance of crystal size on the transformation rate. A key parameter in this theory is the rat…
L-Sorbose degradation in Klebsiella pneumoniae was shown to follow the pathway L-sorbose leads to L-sorbose-1-phosphate leads to D-glucitol-6-phosphate leads to D-fructose-6-phosphate. Transport and phosphorylation of L-sorbose was catalyzed by membrane-bound enzyme IIsor of the phosphoenolpyruvate-dependent carbohydr…
Carbon-11-labeled dimethyloxazolidinedione ([11C]DMO) was injected intravenously into human subjects, and serial positron emission tomographic (PET) scans were obtained until brain-blood equilibration was achieved or could be accurately predicted from dynamic PET and 11C blood data. Knowledge of regional brain-blood p…
The emission and excitation spectra of the SrS: Pb 2+ and SrSe: Pb 2+ phosphors were measured at low temperatures. The 3 A 1u → 1 A 1g emission band at 374 or 392 nm is observed at 80 K in addition to the 3 T 1u → 1 A 1g emission band at 368 or 383 nm for SrS: Pb 2+ or SrSe: Pb 2+ , respectively. On these emission ban…
The site of nitration by nitrogen dioxide on a range of metalloporphyrins has been found to be dependent on the co-ordinated metal; copper(II), nickel(II), and palladium(II) complexes are nitrated specifically on the porphyrin β-pyrrolic position while magnesium(II), zinc(II), chloroiron(III), and cobalt(II) complexes…
Abstract Moisture regimes and associated soil mottling patterns were investigated over a 2‐y period in a Paxton‐Rainbow‐Ridgebury‐Scarboro hydrosequence in central Massachusetts. Changes in physical conditions in these coarse‐loamy fragipan soils were monitored with well points, tensiometers, soil temperature probes,…
Copper surfaces producing enhancement of the Raman scattering cross-section for adsorbed molecules comparable to the largest enhancements observed on silver have been prepared. These substrates are suitable for investigations of reactant intermediates in heterogeneous catalytic reactions, since they exhibit strong enh…
The structure of woBastonite-2M from Death ValJey, CaJifornia, USA, Ca3(Si30g), is monoclinic with space group P21!a, a = 15.409(3), b=7.322(1), c=7.063(1)A, {3=95.30(2)', Z=4 and Dx=2.92g cm-3, and was refined to R (unweighted) =0.038 and R(weighted)=0.031 using 3886 non- equivalent reflections. WoBastonite-2M contai…
Abstract The molecular structure of γ‐methacryloxypropyltrimethoxysilane (γ‐MPS) deposited on the surfaces of particulate mineral fillers was modeled by adjusting the pH of an aqueous alcoholic solution of the silane in absence of a substrate. Hydrolyzates obtained from the solution were studied by gel permeation chro…
This book reviews the causes of corrosion-related events responsible for a significant loss of power plant availability. Problems that occur in the steam generating, geothermal, and nuclear components of power generating systems are discussed. Topics considered include the fundamental aspects of localized environmenta…
These proceedings collect papers presented at a symposium on alloy phase diagrams. Topics include: Crystal phase transformations; order-disorder transformations; crystal lattices; metallic glasses; metastable states; solubility; binary alloy systems; and alloys of iron, tantalum, silicon, aluminum, germanium, palladiu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleInfluence of entanglement on the dielectric normal mode process of cis-polyisopreneKeiichiro Adachi and Tadao KotakaCite this: Macromolecules 1984, 17, 1, 120–122Publication Date (Print):January 1, 1984Publication History Published online1 May 2002Published inissue 1 January 198…
Semi-Annual Progress Report April 30, 1984 through September 30, 1984 COMPOSITE STRUCTURAL MATERIALS Air Force Office of Scientific Research and National Aeronautics and Space Administration Grant No. NGL 33-018-003 Co-Principal Investigators: George S. Ansell Dean, School of Engineering Robert G. Loewy Institute Prof…
The adsorption of CO2 on alumina, alumina–magnesia mixed oxides and magnesia has been studied by means of i.r. transmission absorption spectroscopy. CO2 was found to be weakly adsorbed on accessible cations. With high densities of surface hydroxyl groups lateral interactions of these cationicly bound CO2 molecules wit…
Problems in solid-state physics , Problems in solid-state physics , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
The principal purposes of this article are (1) to draw attention to the fact that it has recently become possible to study representative internal lamellar microsmctures of melt-crystallized polyolefines with the transmission electron microscope; (2) to describe the new techniques which have made this possible and con…
From observation by microscope of DOBAMBC and mixtures of smectic C and cholesteric, a structure of Sm C* in planar samples has been determined as depending on the sample thickness d. In all samples there are unwound layers at the sample surfaces with dipole-moments directed from the surface to the sample bulk. In thi…
The air-stable compounds R[TcNCl4] and R[TcNBr4](R =[AsPh4]+ or [NBun4]+) have been prepared by the reaction of [NH4][TcO4] with NaN3 in the presence of concentrated HCl or of HBr. The e.s.r. spectra of [TcNCl4]– and [TcNBr4]– are typical of ions with a 4d1 electronic configuration and the unpaired electron in an orbi…