Thermoplastic linear poly(ether-urethane) sulphonated ionomer (PEUSI), doped with natural Fe2+, was studied by Mössbauer spectroscopy at T = 78 and 290 K in order to monitor the chemical state of Fe species. The Fe2+ added was found to get only partly oxidised in the course of preparation of a dry polymer film from aqueous suspension. The oxidised part gave a ferric quadrupole doublet (over hal...

Homoleptic metal-sugar complexes were obtained in the form of MnIIand FeII-diacetoneglucose derivatives. The protolysis of [Mn3Mes6] and [Fe2Mes4] (Mes ) 2,4,6-Me3C6H2) with DAGH (1,2:5,6-di-O-isopropylideneR-D-glucofuranose, diacetoneglucose) led to [M(DAG)2] [M ) Mn (1), Fe (2)]. Although monomeric in solution, they showed a different degree of aggregation in the solid state, iron being monom...

Direct correlations and a Principal Component Analysis (PCA) are presented for a complete sample of 110 soft X-ray selected AGN of which about half are Narrow-Line Seyfert 1 galaxies (NLS1s). The direct correlation analyses show that narrower FWHM(Hβ) correlates with steeper X-ray spectrum, stronger optical FeII emission, weaker [OIII] emission and stronger short-term X-ray variability. This di...

Self-assembly offers a general strategy for the preparation of large, hollow high-symmetry structures. Although biological capsules, such as virus capsids, are capable of selectively recognizing complex cargoes, synthetic encapsulants have lacked the capability to specifically bind large and complex biomolecules. Here we describe a cubic host obtained from the self-assembly of FeII and a zinc-p...

The resolutions of metal-4-(2-pyridylazo)resorcinol chelates by capillary zone electrophoresis (CZE) were investigated in the presence of some interacting reagents; also, equilibrium reactions between the chelates and the interacting reagents were analyzed in an aqueous solution. Among nine metal chelates formed in aqueous solution, the chelates of VV, FeII, CoIII, NiII, and CuII were resolved ...

Context. Molecular hydrogen observations towards Herbig-Haro objects provide the possibility of studying physical processes related to star formation. Aims. Observations towards the luminous IRAS source IRAS11101-5928 and the associated Herbig-Haro objects HH135/HH136 are obtained to understand whether high-mass stars form via the same physical processes as their low-mass counterparts. Methods....

Metals such as CuI and FeII generate hydroxyl radical (.OH) by reducing endogenous hydrogen peroxide (H2O2). Because antioxidants can ameliorate metal-mediated oxidative damage, we have quantified the ability of glutathione, a primary intracellular antioxidant, and other biological sulfur-containing compounds to inhibit metal-mediated DNA damage caused hydroxyl radical. In the CuI/H2O2 system, ...

Supernovae remnants are known to be luminous sources of infrared FeII] emission. By studying how the luminosity scales with age, environment and other relevant factors, we can construct an FeII] luminosity function for supernovae remnants. This will enable us to predict supernovae rates in starburst galaxies that are too distant for individual remnants to be resolved. First, however, we require...