314 research outputs found
Control de la enfermedad de Chagas a traves del mejoramiento de la vivienda : informe final; sectores salud y social
New prenylated quinones from Peperomia galioides
Two new prenylated quinones, piperogalone and galopiperone, and a new prenylated dihydroquinone, hydropiperone, were isolated from #Peperomia galioides H.B.K (#Piperaceae). Hydropiperone exhibited potent antiparasitic activity against three species of #Leishmania$. (Résumé d'auteur
In vitro and in vivo leishmanicidal studies of Peperomia galioides (Piperaceae)
Petroleum ether and methylene chloride extracts of #Peperomia galioides and three phenylated diphenols, grifolic acid, grifolin and piperogalin exhibited in vitro antileishmanial activity. During the course of infection of BALB/c mice with #Leishmania amazonensis, the treatments with each of these compounds did not influence the progression of the disease. (Résumé d'auteur
Small-spatial scale variations of nebular properties and the abundance discrepancy in three Galactic HII regions
We present results of long-slit spectroscopy in several slit positions that
cover different morphological structures of the central parts of three bright
Galactic HII regions: M8, M17 and NGC7635. We study the spatial distributions
of a large number of nebular parameters such as the extinction coefficient,
line fluxes, physical conditions and ionic abundances at the maximum spatial
resolution attainable with our instrumentation. Particularly, our goal is to
study the behaviour of the abundance discrepancy factor of O^{2+}, ADF(O^{2+}),
defined as the logarithmic difference of the O^{2+} abundances derived from
collisionally excited and recombination lines. We find that the ADF(O^{2+})
remains fairly constant along the slit positions of M8 and M17. In the case of
NGC7635, we only detect the OII recombination lines in the integrated spectrum
along the whole slit, where the ADF(O^{2+}) reaches a remarkably high value of
about 0.59 dex. We compare our results with previous ones obtained for the
Orion Nebula. We find several evidences that suggest the presence of a
candidate to Herbig-Haro object in M8.Comment: 18 pages, 9 figures. Table A1 available only in the online version.
Accepted for publication in MNRAS
A research agenda on geoinformation sciences towards responsible land administration in Colombia
Barcodes of marine invertebrates from north Iberian ports: Native diversity and resistance to biological invasions
Ports are gateways for many marine organisms transported by ships worldwide, especially non-indigenous species (NIS). In this study carried out in North Iberian ports (Cantabrian Sea, Bay of Biscay) we have observed 38% of exotic macroinvertebrates. Four species, namely the barnacle Austrominius modestus, the tubeworm Ficopomatus enigmaticus, the Pacific oyster Crassostrea gigas and the pygmy mussel Xenostrobus securis, exhibited clear signs of invasiveness. A total of 671 barcode (cytochrome oxidase subunit I or 18S rRNA) genes were obtained and confirmed the species status of some cryptic NIS. Negative and significant correlation between diversity estimators of native biota and proportion of NIS suggests biotic resistance in ports. This could be applied to management of port biota for contributing to prevent the settlement of biopollutants in these areas which are very sensitive to biological invasions.Versión del editor2,359
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