Materials Literature
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We consider the thermodynamic properties of the solid phase and solid–fluid phase equilibria of hard dumbbells. The focus of the present work is a more detailed study of the stability of the orientationally disordered (plastic crystal) solid phase relative to other solid phases and to the fluid. Our results indicate t…
An aluminum (Al) target was laser ablated in an oxygen (O 2 ) atmosphere, producing nanosize alumina (Al 2 O 3 ) powder. The powder surface area decreased (and the particle size increased) with both increasing oxygen pressure and laser fluence. All powders produced had surface areas between 135 and 250 m 2 /g, corresp…
Abstract The present article describes a group of new materials by the combination between organic polymer and silica gel, one of typical inorganic substances. Characteristics of these materials exist in the dimension of blending of the two components, i.e., blending at the molecular level dispersion. The new material…
Four mixed valence, trinuclear manganese complexes of general stoichiometry MnIIMnIII 2L2(carboxylate) 4X2, where L is a tridentate Schiff base ligand and X is a neutral monodentate donor, have been structurally characterized by using X-ray crystallography. The solid-state magnetic behavior of these compounds and two…
ABSTRACT Diatoms of the family Epithemiaceae possess a unicellular nitrogen‐fixing cyanobacterial endosymbiont. We investigated the potential of extracellular nitrogen and phosphorus concentrations to affect the endosymbiont load of Rhopalodia gibba O. Müll, and Epithemia turgida Ehr. in field and culture populations.…
Escherichia coli dihydrodipicolinate synthase (DHDPS) (EC 4.2.1.52), the first enzyme unique to lysine biosynthesis, catalyses the condensation of pyruvate and aspartate beta-semialdehyde (ASA) by a ping-pong mechanism. Pyruvate binds first to the enzyme, forming a Schiff base with the epsilon-amino group of Lys-161,…
Abstract Batch reactor experiments were performed at 150°C, 175°C, and 200°C to determine the effect of high pH NaOH solutions on the mineralogy of the Opalinus shale. In these experiments, the change in solution quench pH at 25°C, solution composition, and mineralogy were monitored as a function of time for up to ≈40…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubmicron-range attraction between hydrophobic surfaces of monolayer-modified mica in waterKazue Kurihara and Toyoki KunitakeCite this: J. Am. Chem. Soc. 1992, 114, 27, 10927–10933Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Publishe…
The search for substitutes of noble metal supported exhaust control catalysts has led to the study of a number of perovskite oxides (1). The mechanisms of redox processes on these surfaces are topotactic in nature, thus accounting forthe reversible loss and uptake of bulk oxygen or for the concomitant creation and ann…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHole formation and sheeting in the drainage of thin liquid filmsV. Bergeron, A. I. Jimenez-Laguna, and C. J. RadkeCite this: Langmuir 1992, 8, 12, 3027–3032Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 199…
Realgar from various locations, high-purity synthetic realgar, and synthetic realgar with 2 rnolo/o Sb were subjected to unfiltered sunlight, filtered sunlight, and filtered light from a quanz-rungsten-halogen lamp for various times. Both single-crystal and powder samples were used. All of the realgar transformed to p…
The current problems with decreasing fossile resources and increasing environmental pollution by petrochemical-based plastics have stimulated investigations to find biosynthetic materials which are also biodegradable. Bacterial reserve materials such as polyhydroxyalkanoates (PHA) have been discovered to possess therm…
In this paper an overview is given on the occurrence of poly(hydroxyalkanoate) (PHA) in cyanobacteria and its possible role as a putative reserve compound. Comparisons are made with the function of other storage compounds that occur in cyanobacteria. For the cyanobacteria Oscillatoria limosa and Gloeothece sp. PCC 690…
Video polarization microscopy, optical diffraction, and digital image analysis have been employed to investigate the transformation of a well-ordered lamellar (``smectic'') domain phase of ferrimagnetic garnet films into a globally disordered, ``labyrinthine'' pattern. Surprisingly, in view of the presence of nonlocal…
The kinetics and mechanism of the synthesis and degradation of polyhydroxyalkanoates (PHA) in Alcaligenes eutrophus have been studied. PHA polymers were accumulated in the cells in nitrogen-free mineral media containing various carbon substrates, and the accumulated PHA polymers were subsequently degraded after the ca…
This article reports an attempt to develop a general constitutive theory governing the mechanical behavior of twisted short fiber structures, starting with a high twist case, so that the effect of fiber slippage during yarn extension can be ignored. A differential equation describing the stress transfer mechanism in a…
The probability that an Auger electron, generated at a certain depth in a semi-infinite target, escapes from the surface under a certain emission angle is described by the so-called depth distribution function. The exact solution for this depth distribution function has been found in the transport approximation, emplo…
A two-dimensional network of face-sharing FeO2E4 octahedrons (E = S, Se) interspersed with double layers of square E4O4 antiprisms, in whose centers lanthanum atoms are situated, is one description of the layers in the unusual structure of the Fe2La2O3E2 phases (see structure for E = Se on the right). Both the oxidesu…
The bacterial species Escherichia coli has proven to be a powerful tool in the molecular analysis of polyhydroxyalkanoate (PHA) biosynthesis. In addition, E. coli holds promise as a source for economical PHA production. Using this microorganism, clones have been developed in our laboratory which direct the synthesis o…
Beet molasses (BM) has proven to be an excellent feedstock for polyhydroxyalkanoate (PHA) production by Azotobacter vinelandii UWD. The substrate-cost for PHA production from BM in fed-batch culture was one-third of that using glucose. Copolymers containing β-hydroxyvalerate are readily formed in BM medium when valera…