RESUMEN
The aim of this study was to determine the isotopic-turnover rate (RIT ) and trophic-discrimination factor (FTD ) in muscle tissues of Lebranche mullet Mugil liza fed an experimental diet (δ13 C = -27·1; δ15 N = 1·0). Juvenile M. liza exhibited a relatively fast RIT , with a half-life (t50 ) of only 16 and 14 days for δ13 C and δ15 N respectively and a nearly complete isotopic turnover (t95 ) of 68 and 60 days for δ13 C and δ15 N.
Asunto(s)
Dieta , Músculos/química , Smegmamorpha/metabolismo , Animales , Isótopos de Carbono/análisis , Isótopos de Carbono/metabolismo , Conducta Alimentaria , Cadena Alimentaria , Músculos/metabolismo , Isótopos de Nitrógeno/análisis , Isótopos de Nitrógeno/metabolismo , Smegmamorpha/fisiologíaRESUMEN
Stable isotopes were used to evaluate the hypothesis that fish assemblages occurring in shallow and deep areas of a large coastal lagoon are structured in partially segregated trophic modules with consumers showing contrasting reliance on benthic or pelagic food sources. The results revealed that fishes in deep areas were mainly dependent on particulate organic matter in the sediment (SOM), whereas emergent macrophytes were as important as SOM to fish consumers in shallow areas. Conceptual trophic diagrams depicting relationships among basal food sources and consumers in different regions of the lagoon highlighted the greater use of multiple basal food sources by more feeding mode functional guilds in shallow water compared with the use of predominantly benthic resources (SOM) in deep areas. The findings appear to corroborate the initial hypothesis and offer complementary perspectives in understanding the role of spatial ecology in structuring coastal ecosystem function and productivity.
Asunto(s)
Peces , Cadena Alimentaria , Animales , Brasil , Isótopos de Carbono/análisis , Ecosistema , Isótopos de Nitrógeno/análisisAsunto(s)
Revascularización Miocárdica , Enfermedad Aguda , Adulto , Anciano , Puente de Arteria Coronaria , Electrocardiografía , Femenino , Humanos , Masculino , Persona de Mediana Edad , Contracción Miocárdica , Infarto del Miocardio/cirugía , Complicaciones Posoperatorias , Vena Safena/trasplante , Choque Cardiogénico/etiologíaRESUMEN
Dois pacientes com tetralogia de Fallot (TF) e agenesia da arteria pulmonar esquerda(AAPE) foram tratados cirurgicamente, com bons resultados. Como no ato cirurgico o anel pulmonar era inadequado, a via de saida do ventriculo direito (VSVD) foi ampliada com um "patch" de dacron. Uma revisao da literatura demonstrou que os resultados cirurgicos desta rara anomalia nao eram bons ate que, em duas experiencias recentes, a competencia valvular pulmonar foi mantida com o uso de protese biologica na VSVD. Apesar da incompetencia valvular pulmonar, bem tolerada na correcao classica da TF, os nossos pacientes evoluiram bem. Persiste a controversia sobre qual o melhor tratamento da VSVD na TF com AAPE