Materials Literature
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Two constitutive acetoacetyl-CoA (AcAc-CoA) reductases were purified from Alcaligenes eutrophus. Incorporation of [1-14C]-acetyl-CoA into poly-3-hydroxybutyrate (PHB) by systems reconstituted from purified preparations of either 3-ketothiolase, AcAc-CoA reductase and PHB synthase, occurred only when NADPH-AcAc-CoA red…
A new design for an infrared cell useful for studies of the spectrum of surface species on high area solids is presented. The cell is well suited over a wide temperature range (100–1000 K). Other demonstrated features of the cell include ultrahigh-vacuum operation, temperature control to ±1 K, linear and rapid tempera…
Kinetic studies performed on p21H guanine nucleotide complexes with and without Mg2+ show that point mutations at positions 12, 59, and 61 each have a different effect on the rate of nucleotide dissociation. Double mutants with a combination of these amino acid substitutions reveal that the effects of each mutation on…
A dynamical model of the temporal dependence of photostimulated luminescence of the storage phosphor BaFBr:Eu2+ as a result of preceeding x-ray irradiation is presented. The model is based on a monomolecular recombination mechanism. The commonly used bimolecular mechanism leads to contradictions with experimental obse…
The light-sensitive elements of conventional photographic materials are crystallites principally of the bromide or chloride salts of silver. Certain chemical modifications employing sulphur and gold compounds are used to maximize the response, and organic dyes are adsorbed to provide sensitivity throughout the visible…
Advances in machine learning have impacted myriad areas of materials science, such as the discovery of novel materials and the improvement of molecular simulations, with likely many more important developments to come. Given the rapid changes in this ...Read More
Sir Nevill Mott 1987 Oxford: Oxford University Press viii + 128 pp price £17.50 ISBN 0 19 851981 8 A new book by Sir Nevill Mott, even though a small one, can be expected to provide a significant contribution to solid state physics. This one highlights the extension, in recent years, of non-crystalline electronic soli…
We present the results of an extensive molecular-dynamics simulation of a dense polymer system. We show for the first time that simulations are able to cover the whole regime from pure Rouse dynamics to reptation dynamics and give strong evidence of the latter. The mean square displacements clearly exhibit a ${t}^{\fr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoluminescence and relaxation dynamics of cadmium sulfide superclusters in zeolitesYing Wang and Norman HerronCite this: J. Phys. Chem. 1988, 92, 17, 4988–4994Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published inissue 1 August 1…
Abstract Over the last four decades, numerous reports have appeared on the physico‐chemical kinetics, especially crystallization kinetics, based on the Avrami equation, ϕ = exp [− Kt n ] where ϕ is the fraction of material unchanged at time t , K is an overall rate constant and “ n ” is the Avrami exponent indicative…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT6-311G(MC)(d,p): a second-row analogue of the 6-311G(d,p) basis set: calculated heats of formation for second-row hydridesMing Wah Wong, Peter M. W. Gill, Ross H. Nobes, and Leo RadomCite this: J. Phys. Chem. 1988, 92, 17, 4875–4880Publication Date (Print):August 1, 1988Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and morphology of syndiotactic polypropylene single crystalsBernard Lotz, Andrew J. Lovinger, and Rudolf E. CaisCite this: Macromolecules 1988, 21, 8, 2375–2382Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published in…
The solid electrolyte of the system exhibited high ionic conductivity, as well as almost unity ionic transference number at 600°–1000°C. High current density and electrical power can be obtained from a fuel cell at 600°–800°C. was an excellent cathode as compared with Pt electrode. A thin film of stabilized zirconia c…
Silica film was deposited on the surface of soda lime silicate glass by immersing it in hydrofluosilicic acid solution supersaturated with silica gel at low temperature. The composition and the structure of these films were evaluated using ESCA, IRRS, fluoric acid etching test, and sodium leaching test, and they were…
The acoustic transients emitted after breakdown and cavitation bubble collapse upon focusing a Q-switch laser pulse into a liquid are investigated with special emphasis on their modifications induced by a solid boundary. For measuring the form p(t)/pmax of the pressure pulses an optical technique with a resolution of…
Summary The mobility of a foam depends heavily on its texture, which is the distribution of bubble sizes in the dispersion. To incorporate this variable in a mechanistic simulator, the usual conservation equations are coupled with balances on the densities of flowing and stationary bubbles in the foam. This approach t…
The nematic--to--smectic-A transition in liquid crystals is analogous to the normal to superconducting transition in metals with the Frank director n in liquid crystals playing the role of the vector potential A in metals. The liquid-crystal analog of an external magnetic field is a field, arising, for example, from m…
Summary The stability of foam lamellae is limited by capillary pressure. Consequently, as the fractional flow of gas in a foam is raised at a fixed gas velocity, the capillary pressure in a porous medium at first increases and then approaches a characteristic value, here called the "limiting capillary pressure." If th…
Pseudomonas oleovorans was grown in homogeneous media containing n-alkanoic acids, from formate to decanoate, as the sole carbon sources. Formation of intracellular poly(beta-hydroxyalkanoates) was observed only for hexanoate and the higher n-alkanoic acids. The maximum isolated polymer yields were approximately 30% o…
Abstract We present new calculations of electron inelastic mean free paths (IMFPs) for 200–2000 eV electrons in 27 elements (C, Mg, Al, Si, Ti, V, Cr, Fe, Ni, Cu, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Hf, Ta, W, Re, Os, Ir, Pt, Au and Bi) and four compounds (LiF, SiO 2 , ZnS and Al 2 O 3 ). These calculations are based on an…