Anders Jönsson、Stefan Nordlund2007-03-03Journal of Bacteriology
P(II) proteins have been shown to be key players in the regulation of nitrogen fixation and ammonia assimilation in bacteria. The mode by which these proteins act as signals is by being in either a form modified by UMP or the unmodified form. The modification, as well as demodification, is catalyzed by a bifunctional…
Bacterial Genetics and BiotechnologyEnzyme Structure and FunctionBiochemical and Molecular Research
Larisa Tsarkova、Xueyan Zhang、Nikos Hadjichristidis 等 4 位作者2007-03-03Macromolecules
The forces between two adhering surfaces bearing highly extended polymer melt brushes as they are sheared past each other, and between a single melt-brush-bearing substrate sheared across an adhering bare solid surface, were studied using a mica surface force balance with a high shear-force resolution. The melt brushe…
Polymer Surface Interaction StudiesForce Microscopy Techniques and ApplicationsAdhesion, Friction, and Surface Interactions
Grigoris Mountrichas、Nikos Tagmatarchis、Stergios Pispas2007-03-03The Journal of Physical Chemistry B
The aqueous solubilization of carbon nanotubes (CNTs) with the aid of a block copolymer possessing one polyelectrolyte block (namely polystyrene-b-sodium (sulfamate/carboxylate polyisoprene)) is reported. The solubilization protocol, based on the co-dissolution of the copolymer and the CNTs, leads to the formation of…
Carbon Nanotubes in CompositesPolymer Nanocomposites and PropertiesConducting polymers and applications
Hassan Firoozmand、Brent S. Murray、Eric Dickinson2007-03-03Langmuir
Using confocal microscopy and small-deformation rheology, we demonstrate the formation of stable thermoreversible gelatin-based gels with colloidal fractal-type microstructure. The opaque particle gels were made by cooling of transparent mixed aqueous solutions of gelatin (1-3 wt %) and starch (7 wt %) from 40 to 24 d…
Proteins in Food SystemsPickering emulsions and particle stabilizationPolysaccharides Composition and Applications
Eric W. Ainscough、Andrew M. Brodie、Adrian B. Chaplin 等 6 位作者2007-03-03Inorganic Chemistry
The reaction of the cyclotetraphosphazene, [N4P4Cl8], with the difunctional reagent, 2,2'-biphenol, in the presence of potassium carbonate in acetone produced the spiro-substituted derivatives, 2,2'-dioxybiphenylhexachlorocyclotetraphosphazene, bis(2,2'-dioxybiphenyl)tetrachloro-cyclotetraphosphazene, and tris(2,2'-di…
Synthesis and characterization of novel inorganic/organometallic compoundsFlame retardant materials and propertiesStructural and Chemical Analysis of Organic and Inorganic Compounds
Keun‐Hyung Lee、Christopher M. Snively、Steven R. Givens 等 5 位作者2007-03-03Macromolecules
Isotactic poly(1-butene) (i-PB) fibrous membranes with fiber diameters on the order of microns were prepared from polymer solutions using mixed solvents via electrospinning. As demonstrated by FE-SEM, unexpected structures such as curled, twisted ribbon fibers and hollow hemisphere (HHS) on a string appeared depending…
Advanced Sensor and Energy Harvesting MaterialsConducting polymers and applicationsElectrospun Nanofibers in Biomedical Applications
Benjamin D. Yuhas、Sirine C. Fakra、Matthew A. Marcus 等 4 位作者2007-03-03Nano Letters
It is hypothesized that a highly ordered, relatively defect-free dilute magnetic semiconductor system should act as a weak ferromagnet. Transition-metal-doped ZnO nanowires, being single crystalline, single domain, and single phase, are used here as a model system for probing the local dopant coordination environments…
ZnO doping and propertiesCopper-based nanomaterials and applicationsElectronic and Structural Properties of Oxides
Peng Bai、Fabing Su、Pingping Wu 等 8 位作者2007-03-03Langmuir
Mesoporous aluminas with a uniform fibrous morphology were synthesized using a copolymer-controlled homogeneous precipitation method under hydrothermal conditions. Scanning electron microscopy, X-ray diffraction, solid-state magic-angle spinning nuclear magnetic resonance, transmission electron microscopy, thermogravi…
Advanced ceramic materials synthesisMesoporous Materials and CatalysisAerogels and thermal insulation
Zhiqiang Yang、Alexander B. Smetana、C. M. Sorensen 等 4 位作者2007-03-03Inorganic Chemistry
A new tiara Pd(II) thiolate complex, [Pd(SC12H25)2]6, has been synthesized and fully characterized by X-ray single crystal analysis, elemental analysis, MALDI, 1H NMR, powder XRD, IR, Raman, and UV/vis. It was found that, in each complex cluster, the six palladium atoms form a nearly planar hexagonal ring and the adja…
Catalytic Processes in Materials ScienceNanocluster Synthesis and ApplicationsNanomaterials for catalytic reactions
Amália Mezei、Róbert Mészáros、Imre Varga 等 4 位作者2007-03-03Langmuir
The effect of different mixing protocols on the charged nature and size distribution of the aqueous complexes of hyperbranched poly(ethylene imine) (PEI) and sodium dodecyl sulfate (SDS) was investigated by electrophoretic mobility and dynamic light scattering measurements at different pH values, polyelectrolyte conce…
RNA Interference and Gene DeliveryPolymer Surface Interaction StudiesDendrimers and Hyperbranched Polymers
Mathieu Salanne、Christian Simon、Pierre Turq 等 4 位作者2007-03-03The Journal of Physical Chemistry B
The relationships between the ionic mobility, the viscosity, and the atomic-scale structure are investigated in computer simulations of mixtures of LiF and the network glass-forming material BeF(2). The simulations span a wide range of compositions, across which the fluidity of the system changes greatly due to the br…
Material Dynamics and PropertiesIonic liquids properties and applicationsGlass properties and applications
Yuichi Morikawa、Takeshi Kondo、Shusaku Nagano 等 4 位作者2007-03-03Chemistry of Materials
Photoalignment and realignment of nanocylinder domains of a polystyrene-based block copolymer film in both in-plane and out-of-plane modes are successfully attained by irradiating with linear polarized (LPL) or nonpolarized light at 436 nm followed by annealing. This photocontrol allows the on-demand 3D photoalignment…
Liquid Crystal Research AdvancementsBlock Copolymer Self-AssemblyAdvanced Materials and Mechanics
Hui-Min Bao、Jiao-Fan Song、Juan Zhang 等 6 位作者2007-03-03Macromolecules
We show that the microstructures and phase transition behavior of vinylidene fluoride−trifluoroethylene−chlorofluoroethylene terpolymer, P(VDF−TrFE−CFE), with composition of 61.5/30.3/8.2 mol %, can be varied dramatically via different processing conditions. In the well-annealed sample, the polymer exhibits typical re…
Ferroelectric and Piezoelectric MaterialsAdvanced Sensor and Energy Harvesting MaterialsDielectric materials and actuators
Jingjing Li、Alessandro Salandrino、Nader Engheta2007-03-03arXiv
A Yagi-Uda-like optical nanoantenna concept using resonant core-shell plasmonic particles as its "reflectors" and "directors" is studied numerically. Such particles when placed near an optical dipole source in a certain arrangement may exhibit large induced dipole moments, resulting in shaping the far-field radiation…
Materials Science
Gila E. Stein、Edward J. Krämer、Xuefa Li 等 4 位作者2007-03-03Macromolecules
Highly asymmetric block copolymers forming spherical microdomains arrange in a hexagonal lattice as a monolayer, while the bulk equilibrium structure is body-centered cubic. We report a complex transition from two- to three-dimensional packing in thin films of spherical-domain poly(styrene- b -2vinylpyridine), measure…
Theoretical and Computational PhysicsPolymer Surface Interaction StudiesBlock Copolymer Self-Assembly
Hong Yuan、Wanhong Ma、Chuncheng Chen 等 7 位作者2007-03-03Chemistry of Materials
The gold-seed-mediated growth approach is developed to obtain three-dimensional (3D) thorny gold nanoparticles, and their morphology can be tailored by introducing different amounts of Ag + ions into the reaction systems of HAuCl 4 and NH 2 OH in the absence of templates and surfactants. Changing the concentration of…
Gold and Silver Nanoparticles Synthesis and ApplicationsNanocluster Synthesis and ApplicationsLaser-Ablation Synthesis of Nanoparticles
Brent R. Crenshaw、Mark Burnworth、D. Khariwala 等 7 位作者2007-03-03Macromolecules
A detailed and systematic investigation of mechanochromic, melt-processed blends between a series of polyethylenes (PE) with crystallinities ranging from 9 to 66% and two excimer-forming, photoluminescent oligo(phenylenevinylene) dyes is described. A dramatic increase in the nucleation rate of dye aggregates, and ther…
Polymer crystallization and propertiesLuminescence and Fluorescent MaterialsNonlinear Optical Materials Studies
Sudipta Ray、Apurba K. Das、Arindam Banerjee2007-03-03Chemistry of Materials
A protein amino acid, phenylalanine-based bolaamphiphile 1 containing a centrally located oligomethylene group has been found to be a hydrogelator at nearly physiological pH (pH 6.5−7.2) in the presence of divalent metal salts (such as MnCl 2, CoCl 2, CuSO 4, and NiCl 2 ) on sonication. Other structurally related synt…
Metal-Organic Frameworks: Synthesis and ApplicationsRNA Interference and Gene DeliverySupramolecular Self-Assembly in Materials
Jong Hyun Choi、Freddy T. Nguyen、Paul W. Barone 等 8 位作者2007-03-03Nano Letters
Magnetic iron oxide nanoparticles and near-infrared (NIR) fluorescent single-walled carbon nanotubes (SWNT) form heterostructured complexes that can be utilized as multimodal bioimaging agents. Fe catalyst-grown SWNT were individually dispersed in aqueous solution via encapsulation by oligonucleotides with the sequenc…
Carbon Nanotubes in CompositesAdvanced biosensing and bioanalysis techniquesNanopore and Nanochannel Transport Studies
Jan Lipfert、Sebastian Doniach2007-03-03OpenAlex
Small-angle X-ray scattering (SAXS) is increasingly used to characterize the structure and interactions of biological macromolecules and their complexes in solution. Although still a low-resolution technique, the advent of high-flux synchrotron sources and the development of algorithms for the reconstruction of 3-D el…
Protein Structure and DynamicsRNA and protein synthesis mechanismsEnzyme Structure and Function