Papers by María Florencia Carballido
En esta prueba encontrarás preguntas sobre textos. Por lo tanto, es importante que leas cada text... more En esta prueba encontrarás preguntas sobre textos. Por lo tanto, es importante que leas cada texto antes de responder cada pregunta. Debés tener en cuenta que un texto sirve para responder varias preguntas, tal como se te irá indicando.
Urban Ecosystems, 2011
The establishment of landfills in urban areas leads to extensive disturbances. Their development ... more The establishment of landfills in urban areas leads to extensive disturbances. Their development after landfill closure depends on the characteristics of the soil cover, the surrounding communities and the dispersal of plants and animals. This study was carried out in a landfill closed in 2004, surrounded by an urban area, freshwater marshes and a riparian forest. The aim of this study was to determine the role that the closed landfill may play in maintaining rodent communities typical of this zone and its relation to characteristics of the sites. Four rodent and plant samplings were carried out from December 2005 to September 2006 at five sites inside the landfill: three filled cells and two areas of the riparian margin. We recorded a total of 433 individual rodents. The rodent community of the closed landfill included species typical of rural, riparian and rural habitats: Akodon azarae (358), Oligoryzomys flavescens (32), Deltamys kempi , Rattus rattus , Cavia aperea and Scapteromys aquaticus (4). Rodent species composition varied among sites, but A. azarae was usually the dominant species. We found a rich rodent community mostly composed of wild species. The relictual riparian margin may have served as a major refuge for native rodent community while the landfill was in operation, and after closure it possibly acted as a source for some species to colonize the covered cells.
The American Journal of Digestive Diseases, 1971
The purpose of this study is to establish the ultrastructure of the parietal cell of normal, huma... more The purpose of this study is to establish the ultrastructure of the parietal cell of normal, human gastric mucosa, immediately after 60-minute stimulation with pentagastrin (6 ~g/kg body weight per hour) infused intravenously. A total of 20 oral biopsies were taken from 10 subjects. After acid secretion was stimulated, the microvilli and plasmalemmae of the apical and canalicular surfaces appear to increase markedly, whereas tubulovesicles become less prominent. Golgi complexes are frequently dilated and basal infoldings are increased, connecting, sometimes, with vesicles in the cytoplasm. After pentagastrin-stimulation, however, all parietal cells in a biopsy, do not exhibit the same stage of activity. Approximately 5% of the parietal cells resemble, more closely, those obtained from the nonacid-secreting gastric mucosa. Cytoplasmic structures were evaluated quantitatively in 5 subjects. Previous tests on these patients, had demonstrated their normal status from a gastroenterologic point of view. For each patient, 2 groups of 14 cells each, were measured: the first group contained cells in the resting stage; the second group contained cells immediately after stimulation. A total of 140 cells (70 before and 70 after the injection of pentagastrin) was studied. Statistical analysis, in all cases, confirmed the significant variations of tubulovesicles and microvilli, but failed to demonstrate, for 3 subjects, the increased number of mitochondria and canaliculi and the decrease in hyaloplasmic space.
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Papers by María Florencia Carballido