Well-studied model systems present ideal opportunities to understand the relative roles of contemporary selection versus historical processes in determining population differentiation and speciation. Although guppy populations in Trinidad have been a model for studies of evolutionary ecology and sexual selection for more than 50 years, this work has been conducted with little understanding of t...

  The present studywas carried out to survey ectoparasites fauna of gold fish (Carassius auratus) in Mazandaran province (Iran) from April 2009 to March 2010. A total of 200 samples were obtained from 10 ornamental fish supply centers and transferred alive to the laboratory. In this study, the following ectoparasites were isolated: Ichthyophthirius multifillis , Trichodina spp., Gyrodactyl...

Los ecosistemas tropicales tienen altas limitaciones en la disponibilidad natural de fósforo el suelo, condición que se intensifica con su pérdida y fragmentación. En paisajes modificados, relación entre árboles aislados precipitación puede representar una entrada PO₄-P al suelo. Este estudio realiza mediciones sobre 16 individuos 4 especies aislados: Cariniana pyriformis, Cedrela odorata, Lueh...

Introducción: en la actualidad el uso de productos naturales son una opción tratamiento diversas enfermedades, como bien podría ser oleorresina copaiba, que presenta propiedades podrían usadas un coadyuvante periodontitis. Objetivo: determinar efecto clínico y antibacteriano Copaifera reticulata (C. reticulata) «copaiba» apoyo a terapia periodontal no quirúrgica (TPNQ) periodontitis pacientes d...

Specimens of Trichodina magna Van As and Bassson, 1989 (Ciliophora: Peritrichia) from the Nile tilapia Oreochromis niloticus collected from October 2004 to June 2005 in fish ponds situated in three regions of Santa Catarina State, Brazil are described here. Wet smears of skin and gills were prepared in the field, air dried, impregnated with Klein's dry silver method and Giemsa's solution. From ...

BACKGROUND AND OBJECTIVE This study was aimed to analyse the curative effects of Pinellia ternata, Citrus reticulata, and their combination on airway hyperresponsiveness (AHR) to inhaled methacholine, pulmonary eosinophilic infiltration, Th2 cytokine production, and IgE and histamine production in a murine model of asthma. METHODS For this purpose, BALB/c mice were systemically sensitized to ...

A multidisciplinary approach was followed to investigate whether the opioid-like peptide nociceptin/orphanin FQ (N/OFQ) regulates the nigrostriatal dopaminergic pathway and motor behavior. Nigrostriatal dopaminergic cells, which express N/OFQ peptide (NOP) receptors, are located in the substantia nigra pars compacta and extend their dendrites in the substantia nigra pars reticulata, thereby mod...