RESUMEN
The goal of this study was to analyse the vertical structure of the phytoplankton community at the Mundaú reservoir, located in the semi-arid region of northeastern Brazil, and to correlate it to environmental conditions over two distinct seasons, dry and rainy. Samples were collected bimonthly at eight depths in the dry and rainy season for analyses of the physical and chemical variables of the water, as well as density, abundance, dominance, species diversity index and equitability of the community. Analysis of variance (ANOVA-two way) was used to analyse the vertical and seasonal differences, and Canonical Correspondence Analysis (CCA) was used to assess associations between phytoplankton and environmental variables Cylindrospermopsis raciborskii (Woloszynska) Seenaya and Subba Raju was the only dominant species and Geitlerinema amphibium (C. Agardh) Anagnostidis, Merismopedia punctata Meyen and Synedra rumpens Kützing. Others six taxa were abundant in at least one of the samples. Distinct vertical distribution patterns were observed for the abundant taxa between depths and seasons. The cyanobacteria, with the exception of C. raciborskii, showed similar seasonal patterns, with higher densities in the dry season. The CCA showed a strong correlation between the density of the phytoplanktonic species and abiotic variables. The vertical changes in abundant taxa revealed distinct patterns regulated by the variation in the environmental factors that were directly linked to seasonality, with the success of one or more species being dependent on their life strategies and ecological needs. The present study restates the importance of environmental and seasonal factors for phytoplankton composition and distribution in a freshwater tropical reservoir through a vertical gradient.
Asunto(s)
Biodiversidad , Monitoreo del Ambiente , Fitoplancton/clasificación , Biomasa , Brasil , Agua Dulce , Densidad de Población , Dinámica Poblacional , Estaciones del AñoRESUMEN
We present a female patient with acute non-lymphoblastic leukemia (ANLL) and with haematologic features suggestive of its evolution from chronic myeloid leukaemia (CML), in which a bone marrow karyotype showing a "masked" Philadelphia (Ph) chromosome due to a variant translocation of complex type t(9;9;22)(q32;q34;q11) was found. We comment the peculiarities of this special Ph chromosome as well as the differential diagnostic problems between ANLL Ph(+) and CML with onset in blastic crisis.
Asunto(s)
Crisis Blástica/diagnóstico , Cariotipificación , Leucemia Mielógena Crónica BCR-ABL Positiva/diagnóstico , Leucemia Mieloide Aguda/diagnóstico , Cromosoma Filadelfia , Anciano , Crisis Blástica/patología , Cromosomas Humanos Par 22/ultraestructura , Cromosomas Humanos Par 9/ultraestructura , Diagnóstico Diferencial , Reacciones Falso Negativas , Femenino , Reordenamiento Génico , Humanos , Leucemia Mielógena Crónica BCR-ABL Positiva/patología , Modelos Genéticos , Translocación GenéticaRESUMEN
A new scheme for the treatment of dermatopolymyositis with pulmonary fibrosis not responding to corticosteroid therapy is presented. Monthly endovenous administration of a small dose of cyclophosphamide is advocated. Two patients with dermatopolymyositis not responding to prednisone were treated for two years with small doses of cyclophosphamide given monthly after which recovered from muscular and pulmonary involvement showing at present normal clinical parameters.