Abstract Background Distributional responses by alpine taxa to repeated, glacial-interglacial cycles throughout the last two million years have significantly influenced spatial genetic structure of populations. These effects been exacerbated for American pika ( Ochotona princeps ), a small lagomorph constrained thermal sensitivity and limited dispersal capacity. As species conservation concern,...

The hypothesis of isolation by distance (IBD) predicts that genetic differentiation between populations increases with geographic distance. However, gene flow is governed by numerous factors and the correlation between genetic differentiation and geographic distance is never simply linear. In this study, we analyze the interaction between the effects of geographic distance and of wild or domest...

Background: The tan spot disease of wheat caused by Pyrenophera tritici-repentis has become a major disease in most wheat growing areas worldwide. Objectives: Here we used ISSR and RAPD markers to study the genetic diversity of 34 P. tritici-repentis isolates collected from North of Iran. Materials and Methods: The leaves having the typical symptoms of tan spot disease were collected and after...

OTWITHSTANDING their morphological similarity, Drosophila pseudoN obscura and Drosophila persimilis are distinct species. No hybrids between them have been recorded in natural populations, although the two species frequently occur together in the same habitats. Although in laboratory experiments species hybrids may be obtained without much difficulty, intraspecific matings succeed more easily t...

Published Ahead of Print 16 January 2008. 10.1128/JCM.02122-07. 2008, 46(3):842. DOI: J. Clin. Microbiol. Ng, A. Colombo, J. Finquelievich, R. Barnes and J. Wadula M. A. Pfaller, D. J. Diekema, D. L. Gibbs, V. A. Newell, K. P. Surveillance Program, 2001 to 2005 from the ARTEMIS DISK Antifungal : a Global Assessment Candida parapsilosis Isolation and Antifungal Susceptibility of Geographic and T...