Materials Literature
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Saccharomyces cerevisiae and some related yeasts are unusual in that two of the enzyme activities (galactose mutarotase and UDP-galactose 4-epimerase) required for the Leloir pathway of d-galactose catabolism are contained within a single protein-Gal10p. The recently solved structure of the protein shows that the two…
Abstract Structural and magnetic properties of Mgx Zn1−x Fe2O4 powders have been studied with respect to the application for thermal cancer therapy (magnetic hyperthermia). Mgx Zn1−x Fe2O4 (x=0.1–0.5) powders with particle sizes between 5 and 8 nm were produced by citrate method. The X-ray diffraction patterns of the…
X-ray photon-correlation spectroscopy is used to measure the dynamic structure factor $f(q,\ensuremath{\tau})$ of gold particles moving on the surface of thin polymer films. Above the glass transition of the polymer the peculiar form $f(q,\ensuremath{\tau})\ensuremath{\sim}\mathrm{exp}[\ensuremath{-}(\ensuremath{\Gam…
A facile method to template mixed polymer-brush gradients onto a Au surface using a “grafting-from” atom-transfer radical polymerization coupled with an in-plane electrochemical-potential gradient is developed and studied (see figure), PNIPAAm: poly(N-isopropylacrylamide); PHEMA: poly(2-hydroxyethyl methacrylate). Pol…
A water-soluble biotinylated poly( p -phenyleneethynylene) (PPE, 3 ) was synthesized by postfunctionalization of an amine−PPE precursor 2a and investigated for sensory responses in aqueous buffer at physiological pH. Polymer 3 shows similar sensitivity ( K SV = 1.1 × 10 4 M -1 ) to Hg 2+ ions when compared to PPE 1 (…
A series of diamine monomers, i.e., 2,2‘-bis{4-[3,4,5-tris( n -alkan-1-yloxy)benzoate]}-4,4‘-biphenyldiamines containing multiple alkyl side chains, were synthesized in which the length of the alkyl side chains was varied from 5 to 18 carbon atoms. Polyimides were prepared from the diamines and pyromellitic dianhydrid…
Abstract We report here a new approach for the modification of the performance of metal catalysts: organic doping of the metal. Specifically, we report that the doping of Ag with Congo Red (CR@Ag) significantly improves the performance of Ag as a catalyst for methanol oxidation to formaldehyde, outperforming both pure…
Reactions between the three components Ag2O, V2O5, and HF(aq) were investigated under hydrothermal conditions, and the recovered phases were, in increasing Ag:V content, Ag2V4O11, beta-AgVO3, Ag4V2O6F2, Ag4V2O7, and alpha-Ag3VO4. A higher ratio of Ag2O to V2O5, as compared to a stoichiometric ratio, was required to sy…
Porous NiTi shape memory alloys are one of the promising biomaterials for surgical implants because of their unique shape memory effects and porous structure with open pores. However, the complex surface morphology and larger area of porous NiTi compared to dense NiTi make it more vulnerable from the viewpoint of rele…
We propose a nonvolatile memory based on carbon nanotubes (CNTs) serving as the key building blocks for molecular-scale computers and investigate the dynamic operations of a double-walled CNT memory element by classical molecular dynamics simulations. The localized potential energy wells achieved from both the interwa…
In this paper, we report the first examples of trispyrazolylmethane complexes of rare earths. Reaction of LnCl3 with Tpm* (tris(3,5-dimethylpyrazolyl)methane) in THF or acetonitrile gives good yields of the [Ln(Tpm*)Cl3] (Ln = Y, Ce, Nd, Sm, Gd, Yb). Tpm* adducts of the lanthanide triflates [Ln(Tpm*)(OTf)3(THF)] (Ln =…
The spin-phonon coupling model that excludes a possible orbital-spin-phonon (OSP) coupling does not adequately explain the softening behavior of the two most intense Raman bands of ${\mathrm{LaMnO}}_{3}$, the parent compound of ``colossal'' magnetoresistivity. To quantitatively interpret the softening behavior of thes…
In this paper, we investigated the self-assembly and fractal feature of chitosan andAg (I), Cu (II)-chitosan due to the theoretical and practical importance of chitosan inbiomedical engineering, biomaterials and environmental sciences etc. The self-assembly andfractal structures of chitosan and Ag (I), Cu (II)-chitosa…
Treatment of (silox)3Ta (1, silox = tBu3SiO) with BH3.THF and BCl2Ph afforded (silox)3Ta(BH3) (2) and (silox)3Ta(eta2-B,Cl-BCl2Ph) (3), which are both remarkably stable Ta(III) compounds. NMe3 and ethylene failed to remove BH3 from 2, and no indication of BH3 exchange with BH3.THF-d8 was noted via variable-temperature…
Abstract The sorption of carbon dioxide in glassy Poly(lactic acid) (PLA) films was studied by quartz crystal microbalance (QCM) at high pressures. Two thermal treatments, melted and quenched, were performed in PLA with two different L : D contents, 80:20 and 98:2, films and compared with a third thermal protocol, ann…
Excited-state properties of allylamine-capped silicon quantum dots (SiQDs) from Si 10 to Si 59 are studied using a density-functional tight-binding method and compared with available experimental data. Signatures in vibrational and optical absorption spectra are revealed, which show the detailed effect of modification…
Derivatives of 9,10-bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene (ex-TTF) have been synthesized by a new synthetic methodology, viz., direct phosphite-mediated cross-couplings of anthraquinone with 1,3-dithiole-2-thione derivatives. These ex-TTFs bear one, two, or four cyanoethyl-protected thiol groups on the dit…
As nutty as a fruitcake! PdSx seed-mediated growth has led to the formation of heterostructured Pd–Co–Pd sulfide peanut-shaped nanoparticles, which were generated by fusing two Co–Pd sulfide acorn-shaped nanoparticles with the Co9S8 phases aligned in the same crystallographic orientation (see TEM image).
CdS nanowires have been grown by a two-cell chemical method using a porous alumina template. Field-emission scanning and transmission electron microscopy show the growth of nanowires of diameters ranging from 100 to 110 nm and 50 to 60 nm for two different templates. The surface topography of the template filled with…
Nanokaffeeringe: Nanopartikel mit definierten optischen und elektronischen Eigenschaften aggregieren durch dynamische Selbstorganisation zu räumlich geordneten 2D-Mustern (siehe SEM-Bild), indem man einfach einen Tropfen einer Nanopartikellösung in einem begrenzten axial-symmetrischen Raum verdampfen lässt. Diese auf…