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...

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...

Adult Swiss albino male mice exposed to mercuric chloride via drinking water at 5 μg/ml for 100 days revealed significant reduction in the wet weight and severe histopathological changes in male accessory organs, poor level of serum testosterone and infertility. These effects were reduced remarkable and fertility was restored when drug (12.50 mg/mouse/day orally) was administered during mercury...

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 ...