Buscar
Mostrando ítems 11-20 de 31850
Ecological aspects of parasitism in the tadpole of Pseudis paradoxa from Argentina.
(Society for the Study of Amphibians and Reptiles, 2003-12)
This study has addressed parasitic infection in different amphibian larval stages, juveniles, and adults. Pseudis paradoxa uses permanent ponds with floating vegetation. The tadpole of P. paradoxa is characterized by its ...
Redefinition of Leptobasis Selys with the synonymy of Chrysobasis Rácenis and description of L. mauffrayi sp. nov. from Peru (Odonata: Coenagrionidae)
(Magnolia Press, 2010-04)
Chrysobasis is synonymized with Leptobasis. The latter is diagnosed by the combination of rounded frons, CuP reaching hind margin of wing, CuA relatively short, and supplementary pretarsal claw reduced to vestigial, and ...
Selective oxidation of anthracene to 9,10-anthraquinone over silica supported vanadium catalyst
(Springer, 2002-04)
The inner-ring oxidation of anthracene over V2O5/SiO2 catalyst was investigated at various oxygen concentrations, contact times of the reactants and reaction temperatures. Up to 90% yield to 9,10-anthraquinone is obtained ...
Philips Argentina: [a history of tube manufacture by Philips in Argentina]
(Tube Collector Association, 2009-10)
A brief history of Phillips & Co in Argentina
On diffusion, drift and the Einstein relation
(IOP Publishing, 2002-07)
The diffusivity, mobility and limitations of the Einstein relation are discussed by means of two pedagogical examples. In a simple one-dimensional analysis, we compute the consequences of the single-particle occupancy ...
Deactivation and regeneration of Cu/SiO2 catalyst in the hydrogenation of maleic anhydride. Kinetic modeling
(Elsevier Science, 2009-10)
In this work, the deactivation of a Cu(10%)/SiO2 catalyst in the gas-phase hydrogenation of maleic anhydride (MA) was studied. The reaction was performed between 170 and 220 °C, at atmospheric pressure and using two contact ...
Abundance and distribution of endangered Franciscana dolphins in Argentine waters and conservation implications
(Wiley Blackwell Publishing, Inc, 2010-01)
This is the first study in Argentine waters on the abundance of the threatened Franciscana dolphin, Pontoporia blainvillei. During 2003-2004 we carried out 17 aerial surveys using line transect sampling methodology. We ...
Quantification of active sites for the determination of methanol oxidation turn-over frequencies using methanol chemisorption and in situ infrared techniques. 2 - Bulk metal oxide catalysts
(American Chemical Society, 2001-10)
Bulk metal oxide catalysts, especially bulk mixed-metal molybdates such as Fe2(MoO4)3, often exhibit high methanol oxidation activity and selectivity. However, the difficulties involved in determining active surface site ...
Comparación de tres modelos teóricos explicativos del constructo experiencia óptima o flowComparison of three explanatory theoretical models optimal experience construct or flow
(Centro Interamericano de Investigaciones Psicológicas y Ciencias Afines, 2009-12)
En el estudio que se informa se presentan tres modelos teóricos explicativos de la experiencia óptima. El primer modelo propone la experiencia óptima como un único factor compuesto por las ocho características que definen ...
Microdomain orientation dependence on thickness in thin films of cylinder-forming PS-b-PMMA
(Iop Publishing, 2010-04-09)
The self-assembly of block-copolymer thin films in periodic nanostructures has received considerable attention during the last decade due to their potential applications in nanofabrication and nanolithography. We followed ...