Materials Literature
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Although Lactococcus is one of the most extensively studied lactic acid bacteria and is the paradigm for biochemical studies of citrate metabolism, little information is available on the regulation of the citrate lyase complex. In order to fill this gap, we characterized the genes encoding the subunits of the citrate…
One-dimensional holographic photonic crystals that incorporate photochromic azobenzene-derived liquid crystals (LCs) have been produced. The additive photochromic molecules disrupt the host LC nematic order, inducing an isothermal phase transition and changing the effective dielectric properties of the LC layer (see F…
Pt nanoparticles are incorporated in the three-dimensional nanospace inside single-walled carbon nanohorns using a simple colloidal preparation method. The Pt particles are preferentially deposited inside nanohorns and are located near the defects (see Figure).
Abstract Layer‐by‐layer (LbL) assembly of polymer electrolyte multilayers is now a well‐established method for the fabrication of thin films by sequential adsorption of alternating layers of oppositely charged polyelectrolytes. Most commonly, such adsorptions have been from quiescent solutions of varying ionic strengt…
We have measured the electrical resistance R between the ends of a multiwall carbon nanotube during telescopic extension of the nanotube. R increases monotonically with extension and is hysteresis free, demonstrating that a telescoping nanotube constitutes a near-ideal nanometer-scale rheostat. The functional form of…
The refractive index dependence of the spontaneous emission rate is determined using organically capped CdSe and CdTe quantum dots as probes. The radiative lifetime of the exciton emission is measured in a variety of apolar solvents with refractive indices n between 1.37 and 1.50. It is demonstrated that quantum dots…
Poly(ethylene glycol)-poly(epsilon-caprolactone) diblock copolymers PEG-PCL were synthesized by ring-opening polymerization of epsilon-caprolactone using monomethoxy poly(ethylene glycol) as the macroinitiator and calcium ammoniate as the catalyst. Obvious mutual influence between PEG and PCL crystallization was studi…
The two-dimensional $^{17}\mathrm{O}$ dynamic-angle spinning solid-state nuclear magnetic resonance spectrum of silica glass produced from the melt was measured. From this spectrum a three-dimensional histogram correlating $^{17}\mathrm{O}$ chemical shift, quadrupolar coupling constant, and quadrupolar coupling asymme…
Cubic ZnSe nanowires with periodically alternating twins along the wire growth direction (see Figure) have been synthesized using thermal evaporation with a Au catalyst. The periodicity of the alternating twins has a linear dependence on the diameter of the nanowires. Sharp excitonic peaks dominating the low-temperatu…
Magnetization plateaus, visible as anomalies in magnetic susceptibility at low temperatures, are one of the hallmarks of frustrated magnetism. We show how an extremely robust half-magnetization plateau can arise from coupling between spin and lattice degrees of freedom in a pyrochlore antiferromagnet, and develop a de…
CO adsorption on Cu(111) and Cu(001) surfaces has been studied within ab-initio density functional theory (DFT). The structural, vibrational and thermodynamic properties of the adsorbate-substrate complex have been calculated. Calculations within the generalized gradient approximation (GGA) predict adsorption in the t…
In the context of spin electronics, the two spin-channel model assumes that the spin carriers are composed of two distinct populations: the conduction electrons of spin up, and the conduction electrons of spin down. In order to distinguish the paramagnetic and ferromagnetic contributions in spin injection, we describe…
The frequency dependence of the self energy of a general many--body problem is identified as a main obstacle in correlation calculations based on local approaches. A frequency independent formulation is proposed instead and proven to yield exactly the same numerical results as the original common scheme. Our approach…
In this review we give an overview of the present status of research on carbon nanotube (CNT) field emitters and their applications. Several different construction principles of field-emission devices with CNTs are summarized. The emission mechanism is introduced and a detailed overview is given of the measured emissi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic Metals and Superconductors Based on BETS (BETS = Bis(ethylenedithio)tetraselenafulvalene)Hayao Kobayashi, HengBo Cui, and Akiko KobayashiView Author Information Institute for Molecular Science and CREST, Okazaki 444-8585, Japan Research Center for Spectrochemistry, G…
Multiwall carbon nanotubes (MWCNTs) were chemically oxidized in a mixture of sulfuric acid and nitric acid (3:1) while being ultrasonicated. The effect of oxidative ultrasonication at room temperature on development of functional groups on the carbon nanotubes was investigated. The dispersability and the carboxylic ac…
The enzymatic formation of supramolecular hydrogels is reported. A dephosphorylation enzymatic reaction (see Figure) triggers the self-assembly of N-(fluorenyl-methoxycarbonyl) tyrosine and results in hydrogelation at physiological temperatures. This enzymatic gelation process offers opportunities for in-situ generati…
Today's energy functions are not able yet to distinguish reliably between correct and almost correct protein models. Improving these near-native models is currently a major bottle-neck in homology modeling or experimental structure determination at low resolution. Increasingly accurate energy functions are required to…
A survey of layer-by-layer (LBL) assembled poly(aniline) (PANI)-based electrochromic films is presented. PANI was LBL assembled with a wide variety of counterpolymers by both electrostatic and hydrogen bonding complexation forces. Post-assembly analysis included electrochemical and optical evaluation such as cyclic vo…
Abstract Summary: Water‐processable conducting polyaniline derivatives (PANIs), such as polyaniline (PANI), poly( o ‐methylaniline) and poly( o ‐methoxyaniline), were synthesized by in situ chemical polymerization of the corresponding achiral monomer in the presence of the novel chiral polymeric template, chondroitin…