Materials Literature
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The TM0920 gene of Thermotoga maritima encodes a predicted iron-containing 1,3-propanediol dehydrogenase (EC 1.1.1.202) with a molecular weight of 39,944 Da and a predicted isoelectric point of 6.1. 1,3-propanediol dehydrogenase catalyzes the oxidation of propane-1,3-diol to 3-hydroxypropanal with the simultaneous red…
Abstract Dithienylethenes having a pyridinium cation at one and both thiophene rings were synthesized. The derivatives with two pyridinium cation showed the cyclization quantum yield as high as 0.71, which is much larger than the values of the monocation derivative and the neutral form. This can be explained by the co…
The novel structure of the delta1 phase in the cobalt-zinc system was determined by single-crystal X-ray diffraction. The structure features fused double icosahedra linked by edge- and face-sharing. The delta1-CoZn(7.8) structure is incommensurately modulated along the columnar b direction. The extent of the linear pe…
The structure of the transition metal oxide V6O13, a potential cathode material in lithium-polymer batteries, has been studied at 95 K using single-crystal X-ray diffraction (XRD). A phase transition has been determined by differential scanning calorimetry (DSC) measurements to occur at 153 K, with a heat of transitio…
Raw and dehaired Australian and Chinese Liaoning cashmere were evaluated for cashmere fibre curvature, cashmere fibre length, resistance to compression, and mean fibre diameter. Tested cashmere originated from commercial lots, and previous experimental samples. In Australian goats, cashmere fibre curvature was depende…
The diatom genus Eunotia is unusual among raphid diatoms in having a raphe system consisting of two short slits that are not integrated into the primary pattern center. This and other characteristics, particularly the presence of rimoportulae, are consistent with the hypothesis that Eunotia is a basal lineage within t…
Kinetics of collision processes with linear mixing rules are investigated analytically. The velocity distribution becomes self-similar in the long-time limit and the similarity functions have algebraic or stretched exponential tails. The characteristic exponents are roots of transcendental equations and vary continuou…
A spin-orbital superexchange Hamiltonian in a Mott insulator with ${t}_{2g}$ orbital degeneracy is investigated. More specifically, we focus on a spin ferromagnetic state of the model and study a collective behavior of orbital angular momentum. Orbital order in the model occurs in a nontrivial way---it is stabilized e…
Abstract The cloud‐point temperatures ( T cl 's) of poly(ethylene oxide) (PEO) and poly(ethylene oxide)‐ block ‐polydimethylsiloxane (P(EO‐ b ‐DMS)) homopolymer and block‐oligomer mixtures were determined by turbidity measurements over a range of temperatures (105 to 130 °C), pressures (1 to 800 bar), and compositions…
NTP, nucleotide triphosphate; TNP-GTP, 2′-(or 3′)-O-(trinitrophenyl)guanosine 5′-triphosphate; PCR, polymerase chain reaction; HEPES, 2-hydroxyethylpiperazineethanesulphonic acid; IMCA-CAT, Industrial Macromolecular Crystallography Collaborative Access Team; APS, Advanced Photon Source; CCD, charge-coupled device; RMS…
Curie temperatures (TC) of the diluted magnetic semiconductors (DMS) of (Ga,Mn)N and (Ga,Cr)N are evaluated from first-principles with the local spin density approximation by using the Korringa–Kohn–Rostoker method combined with the coherent potential approximation (KKR-CPA). The ferromagnetic states are stable in V-…
Abstract The influence of different organobentonites on the decomposition and the combustion behaviour of an epoxy resin were examined. The epoxy resin is a cationically polymerised cycloaliphatic epoxy resin flexibilised with poly(tetrahydrofuran) (PTHF), with hydroxyl endgroups. The bentonite was modified with eithe…
The crystal structures of the alkali-metal bis(oxalato)borate salts A[B(C2O4)2] (A = K, Na, Li) have been determined ab initio using powder diffraction data obtained from a laboratory diffractometer. The K compound crystallizes in the orthorhombic space group Cmcm and its structure has been solved by direct methods ap…
We report on the study of the dynamics of long wavelength phason fluctuations in the i-AlPdMn icosahedral phase using coherent x-ray scattering. When measured with a coherent x-ray beam, the diffuse intensity due to phasons presents strong fluctuations or speckles pattern. From room temperature to 500 degrees C the sp…
The aim of this study was to characterize the extracellular polysaccharides (EPS) released by a freshwater Thalassiosira sp. (Bacillariophyceae) and evaluate their degradation by heterotrophic microbial populations from the same habitat of Thalassiosira sp., a tropical eutrophic reservoir. The EPS were purified by ani…
Abstract The association behavior of telechelic hydrogen‐bonded poly(ether ketone) (PEK) and polyisobutylene (PIB) polymers and the formation of a new class of pseudo‐block copolymers is reported. The attachment of complementing hydrogen bonds (thymine/2,6‐diaminotriazine and cytosine/2,6‐diaminotriazine) onto the res…
We present the first in vivo study of diatoms using atomic force microscopy (AFM). Three chain-forming, benthic freshwater species -Eunotia sudetica, Navicula seminulum and a yet unidentified species - are directly imaged while growing on glass slides. Using the AFM, we imaged the topography of the diatom frustules at…
Abstract Polystyrene/montmorillonite nanocomposites were prepared via in situ bulk polymerization. New imidazolium salts were used to modify montmorillonite obtaining an improvement in thermal stability in comparison with a montmorillonite modified with a standard alkylammonium cation. The synthesized cations facilita…
We investigated the adhesive mucilage and mechanism of cell‐substratum adhesion of two benthic raphid diatoms, the marine species Craspedostauros australis E. J. Cox and the freshwater species Pinnularia viridis (Nitzsch) Ehrenberg. SEM images of P. viridis and C. australis cells revealed the presence of multistranded…
The creation of microlenses from hydrogel microparticles is demonstrated. The fabrication of substrate‐supported microgels is performed using electrostatic interactions between aminopropyltrimethoxysilane‐functionalized glass substrates and acrylic acid groups present on the microgel surface. The lensing ability is il…