10,000 publications from this institution
<p>The effect of docetaxel on the growth of DU145 parental cells after control siRNA or ATP7B siRNA transfections.</p>
The corrosion of pure copper in sulfide-containing aqueous solutions that are typical of crystalline rock repositories in Sweden and Finland for the isolation of High Level Nuclear Waste has been studied using potentiostatic and potentiodynamic polarization, Mott-Schottky analysis, and electrochemical impedance spectroscopy. The results, which are interpreted in terms of the Point Defect Model, indicate that a bi-layer sulfide film forms, comprising of a p-type barrier layer of Cu 2 S and probably an outer layer of CuS, which is n-type in electronic character. The outer layer is not observed to form at 25 o C and at 50 o C, but is observed to form intermittently at 75 o C. Thus, the outer layer is unstable and frequently disappears from the surface by sloughing, resulting in large excursions of the corrosion potential. This phenomenon is found to induce considerable instability in the electrochemical response of the system, such as that under potentiodynamic polarization.
A strictly two-coordinate nickel(II) bis(amido) complex has been prepared and its reactivity towards a variety of small molecules is described. Ni[N(SiMe(3))(DIPP)](2) reacts with DMAP and acetonitrile to form T-shaped three-coordinate complexes, and preliminary results show that Ni[N(SiMe(3))(DIPP)](2) is a catalyst for the hydrosilation of olefins with secondary silanes at ambient temperature.
We present spectroscopic and extensive photometric observations of supernova (SN) 1998de in the S0 galaxy NGC 252, discovered during the course of the Lick Observatory Supernova Search. These data, which span a time period of 8 days before to 76 days after $B$-band maximum, unambigously establish SN 1998de as a peculiar and subluminous SN Ia with strong similarities to SN 1991bg, the prototype of these intrinsically dim SNe Ia. We find that subluminous SNe Ia with the same Delta m_{15}(B) can have slightly different light curves at longer wavelengths. The notable spectroscopic similarities between SN 1998de and SN 1991bg are the wide Ti II trough at 4100-4500 A, the strong Ca II features, and the early onset of the nebular phase. We observe that spectroscopic deviations of SN 1998de from SN 1991bg increase toward redder wavelenghts. These deviations include the absence of the conspicuous Na I D absorption found in SN 1991 at 5700 A, and the evolution of a region (6800-7600 A) from featureless to feature-rich. Several lines of evidence suggest that SN 1998de was a slightly more powerful explosion than SN 1991bg. We discuss the implications of our observations for progenitor models and the explosion mechanism of peculiar, subluminous SNe Ia. The extensive photometric data make SN 1998de a better template than SN 1991bg for calibrating the low-luminosity end of the luminosity vs. decline-rate relationship.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Approaching a Holy Grail? A regioselective functionalization of alkanes occurs with commercially available rhenium catalysts and borane reagents under photochemical conditions [Eq. (1)]. Mechanistic studies indicate that the regioselectivity results from a direct thermal reaction of a photochemically generated 16-electron boryl complex with alkane.
Electrocatalysts supporting the oxygen electrode reaction are commonly covered with thin oxide films that may have a profound influence over the kinetics of the reaction. Little is currently known about the role of oxide films on electrocatalysts, particularly with regard to the role of the defect structure. In this work, the physical and defect structures of the oxide film that forms on platinum in under steady-state conditions have been investigated using electrochemical impedance spectroscopy (EIS) and ARXPS (angle-resolved X-ray photoelectron spectroscopy). Mott-Schottky analysis shows that the film is n-type, indicating that the defects in the film are either platinum interstitials or oxygen vacancies, or both. ARXPS analysis shows that, for potentials between 1.0 and , a single-layer film develops, with the principal oxidation state for Pt (in the film) being . However, a bi-layer structure was observed for films formed at potentials greater than and ARXPS analysis shows that these bilayer films comprise an inner layer containing and an outer layer containing . Optimization of the point defect model on the EIS data yields values for various kinetic parameters that are then used to predict the steady-state thickness and current. Good agreement with experiment is obtained.
