Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of the thermally induced gas-phase decomposition of silane: a revisitationM. A. Ring and H. E. O'NealCite this: J. Phys. Chem. 1992, 96, 26, 10848–10855Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 Decemb…
Spirulina maxima and Rhodopseudomonas palustris, which are known to be capable of synthesizing poly-β-hydroxybutyrate (PHB), were grown under different conditions in order to investigate the metabolic significance of PHB synthesis in phototrophic microorganisms. The intracellular concentration of PHB in S. maxima, gro…
Flavobacterium sp. strain KI725 harbors plasmid pOAD21, a derivative of nylon oligomer-degradative plasmid pOAD2, in which all of nylA (the gene for 6-aminohexanoate cyclic dimer hydrolase [EI]) was deleted but nylB (the gene for 6-aminohexanoate dimer hydrolase [EII]) was retained. KI725 showed no growth on unfractio…
Aluminum‐doped zinc oxide films prepared using a normal‐pressure CVD (NP‐CVD) method were studied as a transparent electrode material. The films were prepared on fused quartz substrates at 500°C using bis(2,4‐pentanedionato)zinc and tris(2,4‐pentanedionato)aluminum as source material. The transparent films, ∼0.3 μm in…
An elongation method, which was already proposed to calculate efficiently the electronic states of aperiodic polymers, is developed to provide the local density of states. Elongation method is carried out by repeating the uniform localization of wave functions with inclusion of the interaction between the cluster and…
Compaction of ultrafine silicon nitride (Si 3 N 4 ) powder at high pressures and various temperatures followed by pressureless sintering was investigated. The powder, consisting of nearly spherical particles (16 nm in diameter) of amorphous stoichiometric Si 3 N 4 , was pressed in a diamond anvil cell under pressures…
Azospirillum brasilense is a rhizosphere microorganism which has potential use for promoting plant growth in economically important crops. Its ability to survive the adverse conditions imposed by nutrient starvation and competition in the rhizosphere is of great importance. A. brasilense accumulates up to 70% of its c…
Electrochemically prepared poly(1,8‐diaminonaphthalene) has been characterized in terms of its electrochemical, chemical, and electrical properties. The polymer is electroactive in aqueous solutions, has a reasonable conductivity of 2 to 3 S/cm in its doped form, and has free‐amine groups as examined by infrared spect…
Abstract The crystal structure, phase transition, electrical conduction behavior of various kinds of MIIZr4(PO4)6 (MIIZP) compounds (MII = Mg, Ca, Sr, Ba, Mn, Co, Ni, Zn, Cd, and Pb) have been investigated. The Mg, Co, Ni, and Zn compounds are of the β-Fe2(SO4)3-type structure and show an order-disorder transition bet…
Mixed metal oxides crystalizing in a perovskite-related structure have long been of interest to solid state chemists and physicists because of their technologically important physical properties. The ready availability of a family of isomorphic solids with controllable physical properties makes these oxides suitable f…
Polycrystalline Bi4Ti3O12 thin films having perovskite structure were successfully produced on platinum coated silicon substrates by the sol-gel technique. Crack-free and crystalline films of 5000 Å thickness were fabricated by spinning and post-deposition rapid thermal annealing treatment at 500 °C for 20 s. The film…
Abstract In Part II of the work, the intermeshing twin‐screw extruder is briefly described and the theoretical procedures used to model its operation are summarized. Based on the microrheological considerations discussed in Part I, a predictive procedure of the morphology evolution during compounding of two immiscible…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR study of kaolinite. 1. Silicon-29, aluminum-27, and proton spectraShigenobu Hayashi, Takahiro Ueda, Kikuko Hayamizu, and Etsuo AkibaCite this: J. Phys. Chem. 1992, 96, 26, 10922–10928Publication Date (Print):December 1, 1992Publication History Published online1 May 2002P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, spectroscopic properties, and hydrolytic chemistry of organophosphonoyl polyoxotungstates of formula [C6H5P(O)]2Xn+W11O39(8-n)- (Xn+ = P5+, Si4+)Gyu Shik Kim, Karl S. Hagen, and Craig L. HillCite this: Inorg. Chem. 1992, 31, 25, 5316–5324Publication Dat…
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,…