Materials Literature
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Abstract We report on three new types of nanoelectromechanical systems based on carbon nanotubes: an electromechanical nanothermometer, a nanorelay and a nanomotor. The nanothermometer can be used for accurate temperature measurements in spatially localized regions with dimensions of several hundred nanometers. The na…
The arylamine N-acetyltransferases (NATs) are xenobiotic-metabolizing enzymes that catalyze the N-acetylation of arylamines and their N-hydroxylated metabolites. These enzymes play a key role in detoxication of numerous drugs and xenobiotics. We report here the cloning, functional expression, and characterization of t…
The optical properties of the nanoscale neodymium ceramic cluster (THF) 8 Nd 8 O 2 Se 2 (SePh) 16 (Nd8) and molecular (DME) 2 Nd(SC 6 F 5 ) 3 (Nd1) were studied by optical absorption, photoluminescence, and time-resolved spectroscopy. Both complexes exhibited emission characteristic of solid-state materials with bands…
The effects of chemical composition, calcination temperature, and the addition of potassium on the physicochemical properties and reactivity of MnCeO x systems in the catalytic wet oxidation (CWO) of phenol with oxygen ( T R = 373 K; P R = 1.0 MPa; w cat / w phenol = 5) have been addressed. Characterization data of “f…
An electrostatic layer-by-layer self-assembly technique was used to encapsulate solid core paclitaxel nanoparticles within a polymeric nanometer-scale shell. This approach provides a new strategy for the development of polymeric vehicles that control drug release and target diseased tissues and cells specific to the a…
Abstract Nanocomposite thin films composed by (BaTiO 3 ) 1– x –(CoFe 2 O 4 ) x with different cobalt ferrite concentrations ( x ) have been deposited by pulsed laser ablation on platinum covered Si(001) substrates. The films structure was studied by X‐ray diffraction and Raman spectroscopy. It was found that the CoFe…
The nanostructure of a spread monolayer of diblock copolymers of poly(hydrogenated isoprene) and poly(styrenesulfonate) at the air/water interface were studied by in situ X-ray reflectivity as a function of the brush density and salt concentration. When the monolayer was compressed beyond the "critical brush density",…
Highly monodisperse samples of diphosphine ligand (1,3-bis(diphenylphosphino)propane- or 1,5-bis(diphenylphosphino)pentane)-protected gold nanoparticles form rapidly in a mixed methanol/chloroform solvent environment. Methanol soluble octagold, decagold, and undecagold monolayer protected clusters yield very stable io…
A technique was developed to size-selectively separate polydisperse dispersions of CdSe/ZnS nanocrystals into distinct color fractions using only the tunable solvent properties of CO2-expanded hexane. This size-selective precipitation of semiconductor nanoparticles is achieved by finely tuning the solvent strength of…
Kühlender Magnet: In einem aus zehn Metallatomen bestehenden gemischtvalenten Mn-Supertetraeder (siehe Bild; Mn violett, O rot, N blau, Br braun, C grau) liegt ein Spingrundzustand von S=22 vor, und es überwiegt der ferromagnetische Austausch. Das magnetische Verhalten macht den Cluster für die Verwendung als magnetis…
Two bis(mu-phenoxo)dicopper(II) complexes, [(L(CH3))(2)Cu(2)] (1) and [(L(t-Bu))(2)Cu(2)] (2), where L(CH3) and L(t-Bu) represent the dianions of (methylamino)-N,N-bis(2-methylene-4,6-dimethylphenol) and of (methylamino)-N,N-bis(2-methylene-4,6-di-tert-butylphenol), respectively, are reported to demonstrate the effect…
It is determined by first-principle calculations and experiments that the threshold field to achieve 1 mA/cm2 emission current density is reduced from 4.8 to 2.3 V/μm by changing pyridine-like nitrogen doping into substitutional nitrogen doping in carbon nanotubes.
Small heat shock proteins (sHSPs) are members of a diverse family of stress proteins that are important in cells to protect proteins under stressful conditions. Genome analysis of Bifidobacterium breve UCC2003 revealed a single sHSP-encoding gene, which was classified as a hsp20 gene by comparative analyses. Genomic s…
The present work is focused on the synthesis and characterization of ceria-based mixed oxides. Ceria was combined with the other oxides from group III, with the intention of improving the catalytic properties of thus obtained materials. (B 2 O 3, Al 2 O 3, Ga 2 O 3, In 2 O 3 )−CeO 2 mixed oxides with a wide range of M…
A uranyl complex, the first metal complex to be formed from the cyclo[n]pyrrole series of expanded porphyrins, is formed when cyclo[6]pyrrole is treated with the uranyl cation under aerobic conditions. Spectroscopic, spectroelectrochemical, and electron spin resonance data of this species are consistent with the ligan…
Ultrathin films of benzocyclobutene (BCB)-functionalized random copolymer with styrene and methyl methacrylate, P(S- r -BCB- r -MMA), with thicknesses ranging from 0 to 10.5 nm, were thermally cross-linked on Si substrates. The penetration of deuterated PMMA (dPMMA) into the P(S- r -BCB- r -MMA) films and the microdom…
The improvement of commonly used Gd3+ -based MRI agents requires the design of new systems with optimized in vivo efficacy, pharmacokinetic properties, and specificity. To design these contrast agents, two parameters are usually considered: increasing the number of coordinated water molecules or increasing the rotatio…
Helices 2 and 3 of Engrailed homeodomain (EnHD) form a helix-turn-helix (HTH) motif. This common motif is believed not to fold independently, which is the characteristic feature of a motif rather than a domain. But we found that the EnHD HTH motif is monomeric and folded in solution, having essentially the same struct…
AIM: To examine the topographic features of the fracture surface of a NiTi instrument after fatigue failure, and to correlate the measurements of some features with the cyclic load. METHODOLOGY: A total of 212 ProFile rotary instruments were subjected to a rotational-bending test at various curvatures until broken. Th…
We report a new technique to enhance the electrical conductivity of transparent single-walled carbon nanotube (SWNT) films with a negligible loss of their optical transmittance. Hybridization of the SWNT films with gold nanoparticles increased the electrical conductivity 2-fold to a maximum of 2.0 × 10 5 S/m while mai…