Materials Literature
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Differential scanning calorimetry (DSC) has been employed to characterize the thermal denaturation of CPL1 lysozyme and its isolated fragments in the absence and presence of choline. The heat capacity function of CPL1 lysozyme shows two peaks with Tm values of 43.5 and 51.4 degrees C. At saturating concentrations of c…
The formalism of the Ammann bar grid with two spacings is systematically analyzed. Simple two-by-two matrices describe the self-similar deflation. The deflation and the inflation factors are the two eigenvalues of the matrix. The ratio of the two spacings is derived as another characteristic quantity of the matrices.…
A systematic evaluation of the electrochemical oxidation of porous graphite powder electrodes in , , and propylene carbonate (PC) electrolytes containing or is described. The graphite compounds obtained are characterized by x‐ray powder diffraction while in the electrolyte solution and following evacuation. The potent…
Abstract The effect of the composition of various wood fibers and surface‐treated mica as well as different surface treatments of cellulosic materials on the mechanical properties of PVC composites has been evaluated. Cellulosics were surface modified by prior coating with maleic andydride (MA), mixtures of MA and Na‐…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the structure and mechanism of formation of the Lansbury reagent, lithium tetrakis(N-dihydropyridyl)aluminateDennis D. Tanner and Chi Ming YangCite this: J. Org. Chem. 1993, 58, 7, 1840–1846Publication Date (Print):March 1, 1993Publication History Published online1 May 20…
The small magnitude of (${\mathit{T}}_{\mathit{c}}$-${\mathit{T}}^{\mathrm{*}}$)/${\mathit{T}}_{\mathit{c}}$, where ${\mathit{T}}_{\mathit{c}}$ is the nematic-isotropic phase transition temperature and ${\mathit{T}}^{\mathrm{*}}$ denotes the virtual transition temperature, has been a long-standing puzzle in the physic…
Clays, acid‐activated to an optimum level, have been pillared with alumina to give semi‐crystalline expanded materials with surface acidities, pore volumes and average pore diameters generally higher than those of the corresponding pillared materials derived from a clay matrix not previously acid‐activated. The chloro…
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…