The interactions between surface sulfate and surface vanadate species present on sulfated supported vanadia catalysts under dehydrated conditions have been investigated with infrared and Raman spectroscopies. The surface sulfate species present on sulfated TiO2, ZrO2, and Al2O3 supports and V2O5/TiO2, V2O5/ZrO2, and V2O5/Al2O3 catalysts have identical molecular structures, i.e., (M-O)3SdO, wher...

Statistical studies on Palynology contents of Late Cretaceous to Paleocene age Gurpi Formation in a surface section in Zagros Basin,SW Iran indicate changes in abundance, species diversity, ratio of Spiniferites to Cyclonephelium (S/C), palynological marine index(PMI) values and organic facies. These palynological variations clearly reflect fluctuations in relative sea-level and depositionalenv...

Choice of oviposition site between surface of the medium and paper positioned vertically on the medium by females was studied in four species of Drosophila: D. ananassae, D. bipectinata, D. malerkotliana, and D. biarmipes. Several geographic strains of these species were used. Females of all the four species laid greater proportions of eggs on the surface of medium as compared to surface of the...

Calcareous nannofossil assemblages recovered from a long, continuous section have been described from the Sarayan region in Lut Block in east Iran. The marine Upper Cretaceous sediments of this section yield medium diverse and well-preserved calcareous nannofossil assemblages. A structural analysis of Upper Cretaceous calcareous nannofloras has revealed 30 nannofossil species. A revised zonatio...

This multi-scale and multi-technique work investigates the adsorption of phosphated species on TiO 2 anatase surface. Our original approach declines for first time progressive ethyl substitution phosphates to identify structure complexes formed upon these molecules in aqueous dispersions, under various pH conditions. To quantify adsorbed amount , isotherms were recorded as a function pH. In par...