The extraordinarily rich chemistry of octahedral transition metal halide and chalcohalide clusters has begun to see use in a variety of applications, ranging from catalysis to chemical sensing. In facilitating the design of such cluster-based materials, new synthetic methods for adjusting the core electronic character by atom substitution and for exchanging the six outer terminal ligands are of...

Abstract Tidal disruption events (TDEs) provide a unique opportunity to probe the stellar populations around supermassive black holes (SMBHs). By combining light-curve modeling with spectral line information and knowledge about in host galaxies, we are able constrain properties of disrupted star for three TDEs. The TDEs our sample have UV spectra, measurements N iii C ratios enabled estimates n...

We define a method for analysis of the integrated spectra of extra-galactic globular clusters that provides more reliable measures of age, metallicity and α-element abundance ratio than have so far been achieved. The method involves the simultaneous fitting of up to 25 Lick indices in a χ-fitting technique that maximises the use of the available data. Here we compare three sets of single stella...

The two-solvent method was employed to prepare ZnO encapsulated in mesoporous silica (ZnO/SBA-15). The prepared ZnO/SBA-15 samples have been studied by X-ray diffraction, transmission electron microscope, X-ray photoelectron spectroscopy, nitrogen adsorption-desorption isotherm, and photoluminescence spectroscopy. The ZnO/SBA-15 nanocomposite has the ordered hexagonal mesostructure of SBA-15. Z...

We report [O III] λ5007 Å and [N II] λ6583 Å emission from a globular cluster harboring the ultraluminous X-ray source (ULX) CXOJ033831.8-352604 in the Fornax elliptical galaxy NGC 1399. No accompanying Balmer emission lines are present in the spectrum. One possibility is that the forbidden lines emanate from X-ray illuminated debris of a star that has been tidally-disrupted by an intermediate-...

Dissociation kinetics for loss of a water molecule from hydrated ions of lithiated valine, alanine ethyl ester and betaine are determined using blackbody infrared radiative dissociation at temperatures between -60 and 110 degrees C. From master equation modeling of these data, values of the threshold dissociation energy are obtained for clusters containing one through three water molecules. By ...

This work reports on Ti1-xAgx and Ag-TiNx electrodes deposited by dc/pulsed dc magnetron sputtering at room temperature on poly (vinylidene fluoride) (PVDF) with the purpose to develop sensors for prosthesis. In Ti1-xAgx electrodes, silver content was varied from 0-100 at. %; and for Ag-TiNx electrodes, the nitrogen content was varied between 34 to 43 at. % and the Ti/Ag ratio changed from 12.2...

Iron-sulfur clusters are ubiquitous electron transfer cofactors in hydrogenases. Their types and redox properties are important for H(2) catalysis, but, recently, their role in a protection mechanism against oxidative inactivation has also been recognized for a [4Fe-3S] cluster in O(2)-tolerant group 1 [NiFe] hydrogenases. This cluster, which is uniquely coordinated by six cysteines, is situate...

Iron-sulfur clusters, functioning primarily as electron transfer agents, have important roles in biology, participating in plant photosynthesis, nitrogen fixation, steroid metabolism, and oxidative phosphorylation. Present in animals, plants, and bacteria, iron-sulfur clusters are found at the active sites of redox and catalytic proteins. Since the 1970s, metal sites in iron-sulfur proteins hav...