Stereology was used to quantify components within the kidney of honeyeater birds. Arid zone and wet zone inhabiting 'matched' body mass pairs of birds were examined. The kidney structure of the arid zone white-fronted honeyeater, Phylidonyris albifrons (16.9 g), was compared with that of the wet zone New Holland honeyeater, Phylidonyris novaehollandiae (21.9 g), and that of the arid zone spiny-...

The present study aimed at investigating the possible impact ofZone of Proximal Development (ZPD) on the learners’ performance. Forty-sixIranian university students participated in this study by taking two types of readingcomprehension tests (i.e., the main idea and Wh-question type). The researchersused the Winstep program to analyze the data and estimate the learners’ Raschmeasure in pre, pos...

introduction: electrophysiological studies have demonstrated a relationship between aging and atrioventricular (av) nodal conduction and refractoriness. the aim of the present study was to determine the effects of nodal aging on dynamic av nodal field potential recording during atrial fibrillation (af) in rabbit. methods: two groups of male new zealand rabbits (neonatal 2-week-olds and adult 12...

The experiments examine the extent of reduplication of skeletal parts across the anteroposterior axis, following the transplantation of a zone of polarizing activity (ZPA) to the anterior margin of the limb-bud at successively later stages. Previous studies have suggested that the function of the apical ectodermal ridge (AER) is to maintain cells in a special region at the distal tip (the progr...