Materials Literature
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The pulsed magnetron sputtering of transparent conductive oxide (TCO) films from powder targets is a promising technique, which produces films with dense columnar, defect-free structures and optical and electrical properties comparable to other deposition techniques. The targets are formed from loosely packed oxide po…
We have identified a second RpoH homolog, RpoH(II), in the alpha-proteobacterium Rhodobacter sphaeroides. Primary amino acid sequence comparisons demonstrate that R. sphaeroides RpoH(II) belongs to a phylogenetically distinct group with RpoH orthologs from alpha-proteobacteria that contain two rpoH genes. Like its pre…
The structures of two cyanoaurate-based coordination polymers, M(mu-OH(2))(2)[Au(CN)(2)](2) (M=Cu, Ni), were determined by using a combination of powder and single-crystal X-ray diffraction techniques. The basic structural motif for both polymers contains rarely observed M(mu-OH(2))(2)M double aqua-bridges, which gene…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTMultiporous Material from Fibrillar Syndiotactic Polystyrene IntercalatesSudip Malik, Denis Roizard, and Jean-Michel GuenetView Author Information Institut Charles Sadron, CNRS UPR 22, 6 rue Boussingault, BP 40016, F-67083 Strasbourg Ce…
Diatoms are eukaryotic, unicellular algae that are well known for the intricate architecture of their silica-based cell walls. Species identification is mainly based on variations of their hierarchically organized silica structures. Particularly striking silica frameworks are found among diatoms that belong to the gen…
Introduction Seeds and phytoplankton can be extremely mobile, but usually we are interested in surveying plants that cannot move. Sessile plants are usually arranged over a substrate (soil, sediment, etc.) and can be found, identified and examined at leisure. This characteristic means that, in many ways, it is much ea…
A new electronic structure principle, viz., the minimum magnetizability principle, has been proposed and also has been verified through ab initio calculations, to extend the domain of applicability of the conceptual density functional theory in explaining the magnetic interactions and magnetochemistry. This principle…
Anionic polymerizations of new styrene derivatives, 4-(1-adamantyl)styrene ( 1 ) and 3-(4-vinylphenyl)-1,1‘-biadamantane ( 2 ), were carried out with sec -butyllithium, cumylpotassium, and lithium- or potassium naphthalenide in THF at −78 °C for 3−4 h. The polymerizations of 1 and 2 quantitatively proceeded to afford…
Abstract A series of fully aliphatic polyimidosiloxanes (APISiO) were prepared by poly(addition/condensation) reaction of bicyclo [2,2,2] oct‐7‐ene‐2,3,5,6‐tetracarboxylic dianhydride or cyclobutane‐1,2,3,4‐tetracarboxylic dianhydride and varying compositions of 1,3‐bis (3‐amino propyl)‐tetra methyl disiloxane and rig…
BACKGROUND: The major royal jelly proteins/yellow (MRJP/YELLOW) family possesses several physiological and chemical functions in the development of Apis mellifera and Drosophila melanogaster. Each protein of the family has a conserved domain named MRJP. However, there is no report of MRJP/YELLOW family proteins in the…
Metal and semiconductor nanowire thin films with hierarchical pore structure were electrodeposited using mesoporous silica (primary porogens) containing colloidal silica particles (secondary porogens) as templates. The pore size of the nanowire thin films was independently controlled by the wall thickness of the surfa…
The reaction of M(O2CMe)2.4H2O (M = Ni, Co) with NaN3 in pyridine/MeOH under microwave irradiation and controlled pressure/temperature leads to the formation of the trimetallic species [M3(N3)3(O2CMe)3(py)5] (M = Ni, 1; Co, 2) in 4 min and in high yields. Both complexes display dominant ferromagnetic interactions and…
Abstract Poly( L ‐lactic acid) (PLLA) is generally produced by ring‐opening polymerization of ( S , S )‐lactide, which is prepared from dehydration polycondensation of lactic acid and successive depolymerization. Results of this study show that scandium trifluoromethanesulfonate [Sc(OTf) 3 ] and scandium trifluorometh…
We have studied the magnetic and structural properties of ${\mathrm{PrBaCo}}_{2}{\mathrm{O}}_{5.50}$ and ${\mathrm{GdBaCo}}_{2}{\mathrm{O}}_{5.50}$ using neutron and synchrotron techniques between 10 and $425\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. A unique structural transition has been detected in this temperature ra…
The diffusivity of spherical colloidal particles close to a planar hard wall is studied by dynamic light scattering with evanescent illumination. A novel setup allows us to independently vary the scattering vector components parallel Q parallel and normal Q perpendicular to the wall. An expression for the initial deca…
The consideration of space charge effects at interfaces results in the prediction of considerable storage anomalies in two-phase materials. They are particularly expected in nano-sized systems building a bridge between chemical and electrostatic storage. These effects are systematically treated in the model of an abru…
We report on studies of the charge transport mechanism of the composites of multiwalled carbon nanotubes (MWCNTs) and poly (methyl methacrylate) (PMMA). The MWCNTs were synthesized by a chemical vapor deposition method using Fe as a catalyst. The dc conductivity $({\ensuremath{\sigma}}_{\mathit{dc}})$ and its temperat…
Orb-web weaving spiders depend upon the mechanical performance of capture threads to absorb the energy of flying prey. Most orb-weavers spin wet capture threads with core fibers of flagelliform silk. These threads are extremely compliant and extensible due to the folding of their constituent proteins into molecular na…
The growth of magnetic films with ferromagnetic interactions between nearest-neighbor spins is studied in $(d+1)-$dimensional rectangular geometries for $d = 1,2$. Magnetic films are grown irreversibly by adding spins at the boundaries of the growing interface. The orientation of the added spins depends on both the en…
Granular flows due to simultaneous vertical and horizontal excitations of a flat-bottomed cylindrical pan are investigated using event-driven molecular dynamics simulations. In agreement with recent experimental results, we observe a transition from a solid-like state, to a fluidized state in which circulatory flow oc…