Materials Literature
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Vitamin B6 is an essential coenzyme for numerous metabolic enzymes and is a potent antioxidant. In plants, very little is known about its contribution to viability, growth and development. The de novo pathway of vitamin B6 biosynthesis has only been described recently and involves the protein PDX1 (pyridoxal phosphate…
Comprehensive single-crystal structural investigations of n- and p-type Ba8Ga16Ge30 have been carried out using multitemperature neutron and conventional X-ray diffraction as well as resonant synchrotron X-ray diffraction. The data show that the guest atom positions and dynamics are very similar in the two structures,…
Let's do the twist: Tripodal squaraines self-assemble from acetonitrile to form hollow spheres, the complexation of which with Ca2+ or Mg2+ results in extended networks. An analogous chiral dye exhibits a bisignate CD couplet and a helical morphology upon Ca2+ binding (see figure). Thus, the molecular chirality of a f…
We have analyzed the electronic structure of half-metallic magnets based on first principles electronic structure calculations of a series of semi-Heusler alloys. The characteristic feature of the electronic structure of semi-Heusler systems is a d-d gap in the density of states lying at/close to the Fermi level depen…
We describe several techniques for using bulk matter for special purpose computation. In each case it is necessary to use an evolutionary algorithm to program the substrate on which the computation is to take place. In addition, the computation comes about as a result of nearest neighbour interactions at the nano- mic…
Bisphenol A (BPA), an organic compound largely used in the plastic industry as a monomer for production of epoxy resins and polycarbonate, is an emerging contaminant that is released in the environmentfrom bottles and packaging. BPA degradation (118 micromol L(-1)) under sonochemical conditions was investigated in thi…
A novel in situ autoreduction route has been developed, by which monodispersed silver nanoparticles with tunable sizes could be easily fabricated on silica-based materials, especially inside the channels of mesoporous silica (MPS). 13C CP/MAS NMR spectroscopy was employed to monitor the whole assembly process. It was…
Working together: A “core–satellite” hybrid nanoparticle probe provides highly improved fluorescence and magnetic resonance (MR) imaging capabilities through synergistic enhancement of its respective components. These hybrid nanoprobes can be used for dual-modal fluorescence and MR imaging of neuroblastoma with expres…
The reduction of silver cations bound to the oligonucleotide dC(12) was used to form silver nanoclusters. Mass spectra show that the oligonucleotides have 2-7 silver atoms that form multiple species, as evident from the number of transitions in the fluorescence and absorption spectra. The variations in the concentrati…
We report nanocrystalline TiO2 solar cells sensitized with InAs quantum dots. InAs quantum dots of different sizes were synthesized and incorporated in solar cell devices. Efficient charge transfer from InAs quantum dots to TiO2 particles was achieved without deliberate modification of the quantum dot capping layer. A…
Stable companions: Hollow zirconia shells that each contain one gold nanoparticle (see picture) are stable to sintering and can be used as heterogeneous catalysts in reactions such as the oxidation of CO in air. The performance of Au, @ZrO2 is unaffected by calcination at 800 °C.
Zwei halten zusammen: Hohle Zirconiumoxid-Hüllen, die jeweils ein Gold-Nanopartikel enthalten (siehe Bild), sind stabil gegen Sintern und eignen sich als Heterogenkatalysatoren für Reaktionen wie die Oxidation von CO an Luft. Calcinierung bei 800 °C verringert die Aktivität von „Au, @Zr2O“ nicht.
Along with existing and emerging use of nanoscale materials, growing concerns have arisen about their unintentional health and environmental impact. The objective of the ongoing study was to assess the toxicity profile of metal oxide nanoparticles proposed for use in industrial production methodology. Metal oxide nano…
The performance of an abrasive is dependent on its properties as well as the operating conditions during blasting. This study was undertaken to simulate enclosed blasting operations using steel shot and grit on rusted and painted steel panels; and collect and measure total particulate matter (PM) emissions at commonly…
Nitinol superelastic materials (SEM) are mostly used for low-force/large displacements applications involving tensile or bending modes of loading. The paper describes experiments on the radial compression of superelastic wires and tubes between flat loading surfaces. Elastic (recoverable) deformations—up to 22.5% with…
The surface treatment of thiol-capped CdTe quantum dots (QDs) was carried out with a small amount of sodium borohydride (NaBH 4 ) in aqueous solution at room temperature. The treatment effectively enhanced the photostability of QDs and increased the photoluminescence (PL) efficiency by a factor of two as against the o…
Single bilayer membranes of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) were formed on micron thin-films of hydrophilized carbon nanotubes (CNT) by fusion of small unilamellar vesicles. The structure of the membrane was investigated using neutron reflectivity (NR). The underlying thin film of CNT was forme…
Three collections of Harpephyllum caffrum bark were made from the same female tree in the Eastern Cape during 2003/2004 and tested for antibacterial and antifungal activity. The highest antibacterial activity was detected with plant material collected in June 2003 and December 2003, with a decline in activity in extra…
Fluoroquinolones are broad-spectrum antimicrobial agents that seem to reach their intracellular target site (DNA gyrase) in Escherichia coli by means of an uptake process through the outer and inner membranes. Delivery of quinolones with liposomes has many advantages than the free form of the drug. Liposomes may repre…
Abstract Crosslinking behaviors of acrylonitrile butadiene rubber (NBR)/poly (vinyl chloride) (PVC) alloy, filled with anhydrous copper sulfate (CuSO 4 ) particles, were investigated for the first time by dynamic mechanical analysis (DMA) under hetero and isothermal modes, respectively. In the heterothermal testing, (…