Catalogue of the ectoparasitic insects of the bats of Argentina

Abstract:Taxonomy and distribution of the ectoparasitic insects of bats from Argentina, are reviewed. Seventeen species of Diptera (six of Nycteribiidae and eleven of Streblidae), six species of Siphonaptera (four of Ischnopsyllidae, one of Pulicidae, and one of Stephanocircidae), and seven species of Hemiptera (Polyctenidae) are known presently for Argentina. The information was obtained by reviewing the literature and collecting in the field between 1989 and 1998. The specimens collected in the field were compared with the type material deposited at the Field Museum of Natural History (CHNM). Resumen: En este primer cathlogo de insectos ectoparhsitos de murcielagos de la Argentina, se ofrece informacion sobre taxonomia y distribucion. Se conocen actualmente en el pais 17 especies de Diptera (seis de Nycteribiidae y once de Streblidae), seis de Siphonaptera (cuatro de Ischnopsyllidae, una de Pulicidae y una de Stephanocircidae) y siete especies de Hemiptera (Polyctenidae). Se consulto numerosa literatura sobre los distintos grupos y se reviso abundante material obtenido en viajes de campana realizados desde 1989 a 1998, a numerosas localidades de la Argentina. Se realizaron comparaciones con material tipo del Field Museum of Natural History (CHNM)

A suitable preparation of N-sulfonyl-1,2,3,4-tetrahydroisoquinolines and their ring homologs with a reusable Preyssler heteropolyacid as catalyst

The preparation of N-sulfonyl-1,2,3,4-tetrahydroisoquinolines, N-sulfonyl-2,3,4,5-tetrahydro-1H-2-benzazepines and N-sulfonyl-1,2,3,4,5,6-hexahydrobenzazocine was catalyzed by a Preyssler heteropolyacid, H₁₄[NaP₅W₃₀O₁₁₀], (PA), supported on silica (PASiO₂40) with excellent yields by means of the Pictet–Spengler reaction of N-aralkylsulfonamides with s-trioxane. The reactions proceed with 0.5 mol% of silica-supported catalyst in toluene at 70°C. The catalyst can be recycled without appreciable loss of the catalytic activity.Centro de Investigación y Desarrollo en Ciencias AplicadasFacultad de Ciencias Agrarias y Forestale

Cultura de la evaluación de los aprendizajes en el área matemática. Reflexión y análisis como base de nuevas propuestas pedagógicas

Ningun

Understanding Total Monte Carlo uncertainty propagation in burn up calculations with Generalized Perturbation Theory

International audienceThe last few years has seen Total Monte Carlo becoming the most used method for uncertainty propagation in burn up calculations.This straightfoward approach allows for the direct observation of output uncertainties (keff, isotopic concentrations etc…)of the coupled Bateman equation (fuel depletion) and Boltzmann equation (neutron transport). The application of GPT in thiscoupled case implies not only the calculation of nuclide adjoint functions but also the calculation of a number of importancefunctions. The coupling is thus almost never done.In this paper, we compare the propagation of Pu239 fission, capture and (n,2n) cross sections’ uncertainties with both TMC andGPT methods in a simple Na-cooled fast reactor assembly. In such a case, the change of spectrum due to the change in in onenuclide’s cross sections is expected to be smaller than in a thermal spectrum where the importance of individual resonances ishigh. We will see that it can’t be negligeted. Thanks to the combined use of TMC and GPT we can separate the effects of uncertaintieson a selection of other heavy nuclide densitities.The power normalisation gives minor, but important contributions. The sensitivities to depletion terms are the dominant termsfor Pu239 and its direct daughters’ evolution. The minor actinide density uncertainties are dominated by the impact of Pu239on neutron spectrum and then on minor actinides’ average cross sections. The results of uncertainty analyses could thereforebe very different if basic uncertainties with complete energy and cross nuclide correlations were available