ABSTRACT Plesiomonas shigelloides isolated from water in Brazil was previously described as a hemorrhagic heat-labile cytotoxic-enterotoxin producer. We purified this toxin from culture supernatants using ion metallic affinity chromatography (IMAC) followed by molecular exclusion chromatography. The pure...
Supervivencia Celular/efectos de los fármacos,
Chlorocebus aethiops,
Vesículas Citoplasmáticas,
Enterotoxinas/farmacología,
Dosificación Letal Mediana,
Microscopía Electrónica de Rastreo,
Pruebas de Neutralización,
Plesiomonas/metabolismo,
Plesiomonas/patogenicidad,
Plesiomonas/ultraestructura,
Ríos/microbiología,
Células Vero,
Factores de Virulencia
Abstract Though their broad distribution in most Brazilian rivers, scarce studies concerning ecological interactions on Hypostomus species are available. This study observes the diet, the trophic interactions and some morphological aspects of four syntopic species of Hypostomus. These fishes were studied...
Abstract This study aims to evaluate the environmental factors determining of the changes in phytoplankton structure in spatial (upper, middle and lower course) and seasonal (dry and rainy period) scales in a eutrophic river (Almada River, northeastern Brazil). In the study period, total accumulated rain...
Biodiversidad,
Brasil,
Clorofila,
Clorofila A,
Diatomeas,
Ecosistema,
Monitoreo del Ambiente/métodos,
Fitoplancton/crecimiento & desarrollo,
Lluvia,
Ríos,
Estaciones del Año,
Análisis Espacio-Temporal,
Clima Tropical
Abstract:The Indian hill trout cyprinid, Barilius bendelisis is a member of family Cyprinidae that dwells in shallow, cold, and clear water. In this study, growth parameters and reproductive biology of Indian hill trout, Barilius bendelisis from river Gaula, Central Himalaya region, India, were studied. ...
Tamaño Corporal,
Cyprinidae/fisiología,
India,
Dinámica Poblacional,
Valores de Referencia,
Reproducción/fisiología,
Ríos,
Estaciones del Año,
Distribución por Sexo,
Factores Sexuales,
Factores de Tiempo
ResumenLas plantas carnívoras del género Utricularia, capturan un amplio ámbito de organismos acuáticos. La mayoría se desarrollan en ambientes con carencias de nutrientes y tienen la capacidad de cambiar las condiciones de su microambiente. El objetivo de la presente investigación fue estudiar la ...
AbstractLocal communities in some Asian, African and American countries, use plant toxins in fish poisoning for fishing activities; however, the effects of this practice on the particular wild fish assemblages is unknown. This study was conducted with the aim to investigate the effects of fish poisoning ...
Abstract The aim of this study was to investigate the component community of parasite metazoans of Piaractus brachypomus in the lower Amazon River, northern Brazil. From 34 necropsied fish, 27,384 metazoan parasites were collected, such as Anacanthorus spathulatus, Mymarothecium viatorum and Notozotheciu...
Abstract Trypanosome infections have been reported in several species of fish, in majority of cases described on the basis of morphological characteristics. Trypanosomes in fish are heteroxenous and transmitted by hirudineans. This study aims to evaluate the prevalence and density of infections by Trypan...
Abstract The evaluation of abiotic and biotic variables can provide information for understanding the structure and function of lotic systems. To obtain this information, measurements of 15 chemical and physical variables and of phytoplankton were conducted at two sampling stations. The present study aim...
Abstract The objectives of the present study is to describe the size for exploitation and gonadal maturation of L. pectinata in Peças Island in Paraná coast. Twenty two individuals were sampled every month, from an intertidal flat of the Peças River, Municipality of Guaraqueçaba, during two periods &...
Bivalvos/crecimiento & desarrollo,
Bivalvos/fisiología,
Tamaño Corporal,
Brasil,
Ambiente,
Gametogénesis/fisiología,
Gónadas/crecimiento & desarrollo,
Reproducción/fisiología,
Ríos,
Salinidad,
Estaciones del Año,
Agua de Mar/análisis,
Temperatura
