Materials Literature
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Low-humidity monoclinic lysozyme, resulting from a water-mediated transformation, has one of the lowest solvent contents (22% by volume) observed in a protein crystal. Its structure has been solved by the molecular replacement method and refined to an R value of 0.175 for 7684 observed reflections in the 10-1.75 A res…
The sdaB gene which codes for the second L-serine deaminase (L-SD) of Escherichia coli K-12 has been sequenced and shown to be very similar to the sdaA gene which codes for the first L-serine deaminase. sdaB is transcribed in rich medium, particularly in the absence of glucose, and is under the control of catabolite a…
Previous studies on the surface properties of Dicor castable glass-ceramic have shown the formation of a specific crystalline phase at the glass-ceramic/embedment interface. If this phase is not removed by grinding, it leads to an undesirable strength decrease. The aims of this study were: (1) to determine the nature…
An immersion grating with high refractive index n increases spectral resolution n-fold over that of a surface reflection grating of equal length.
The tetragonal‐to‐cubic phase transition of rapidly quenched 12 mol% ErO 1.5 ─ZrO 2 was investigated in situ using high‐temperature X‐ray diffraction. Rapid quenching of the melt yielded a small oxygen ion displacement and a small tetragonality, axial ratio c/a . Although the tetragonality of the as‐quenched specimen…
Palygorskite has been widely reported as a clay phase in the Recent sediments of the northern Arabian Gulf (e.g. Aqrawi & Sadooni, 1988). It is usually thought to have originated from the sediments and soils of the Mesopotamian flood plains introduced by northwesterly (Shamal) winds (e.g. A1-Bakri et al ., 1984).…
Abstract Non-isothermal, melt film-blowing is analysed by means of a nonlinear integral constitutive equation that incorporates shear history effects, spectrum of relaxation times, shear thinning and extension thinning or thickening. The temperature history, as predicted by the simultaneously solved energy equation, i…
The origin and development of Dubinin's theory are presented within their historical context. The emphasis is put on the author's long-standing collaboration with M.M. Dubinin. It is shown how the main correlations between the structural properties of active carbons and the parameters of the DR and DA equations have b…
Abstract The laser Raman microprobe spectrum of gibbsite displays four intense v (OH)- stretching bands at ~3365, 3435, 3525 and 3618 cm -1 , bayerite shows three near 3425, 3545 and 3564 cm -1 , nordstrandite has three near 3492, 3566 and 3623 cm -1 , and doyleite one broad band centred at -3545 cm -1 with sometimes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigand conformational changes affecting 5T2 .fwdarw. 1A1 intersystem crossing in a ferrous complexJames K. McCusker, Hans Toftlund, Arnold L. Rheingold, and David N. HendricksonCite this: J. Am. Chem. Soc. 1993, 115, 5, 1797–1804Publication Date (Print):March 1, 1993Publicat…
Abstract The effect of temperature on the swelling of clay was studied by determining (1) the relation between the interlayer spacing, λ , and the swelling pressure, Π , at different values of the temperature, T , using the method of Viani et al . (1983) as modified by Wu et al . (1989); (2) the relation between λ and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer chain rupture and the fracture behavior of glassy polystyreneN. Mohammadi, A. Klein, and L. H. SperlingCite this: Macromolecules 1993, 26, 5, 1019–1026Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993ht…
This paper presents an analyste and design study of field scale inhibitor squeeze treatments. Simulators of varying levels of complexity have been used to model squeeze data from several wells in North Sea fields. The modelling has been carried out both for simple single sandbody squeezes and for inhibitor treatments…
In order to increase the stealth of ships, the magnetic anomalies they create are minimized by using deGaussing systems. To improve the deGaussing process, the French Navy has requested a numerical model of the magnetic anomalies created by ships. The authors present an overview of their work in the finite-element mod…
To describe the dynamic process of a yarn twisting system, two conditions, kinematic and kinetic, are usually required. In this paper, general equations of twisting dynamics are derived. When combined, these equations can represent the propagation of twist in a traveling yam, and their solutions can give interesting i…
A thick sacrificial layer for applications in bulk and surface micromachining can be achieved with porous silicon. The technology of freestanding parts of polysilicon is described. The etching process and the use of different masking layers are investigated.
The cubic‐tetragonal phase transition of 14 mol% ErO 1.5 ‐ZrO 2 was investigated through high‐temperature powder X‐ray diffraction. A new tetragonal form without tetragonality, t″ ‐ZrO 2 , was taken into consideration, although only two forms of t‐ and t′ ‐ZrO 2 have previously been distinguished. The metastable t″ ‐Z…
A study has been conducted on the mechanisms of in-situ tensile failure of staple yams during uniaxial tensioning, as in a conventional ravel strip test. The yarns were PET/cotton blends processed on ring, rotor, and airjet spinning systems, and then woven into plain or twill weave fabrics. Load-extension behaviors of…
A 3.4 kb EcoRI fragment, cloned in E. coli, that carries part of a cluster of genes encoding arginine biosynthetic functions of the thermophilic bacterium Bacillus stearothermophilus, was sequenced on both strands. The sequence consists of a truncated argC gene, an argJ region encoding a polypeptide with both N-acetyl…
Thirty five Typic Paleudults and Typic Hapludults under a Lowland Dipterocarp Forest were characterized for clay minerals, free oxides, cation exchange capacity, and exchangeable bases. Kaolinite was predominant in the soil clays followed by quartz, vermiculite and gibbsite and an accessory amount of illite, partially…