W ho becomes the most central individual in a society and why? What determines how many friends a given individual has? What determines how clustered or tightly-knit the friendships in a society are? In a set of important and original new findings reported in this issue of PNAS, Fowler, Dawes, and Christakis (1) provide evidence that network characteristics such as those mentioned above are her...

background: no data is available on morphology and genetic characteristics of echinococcus granulosus derived from donkeys of iran, despite of its existence in donkeys.in the present study morphometric variations of the rostellar hooks of protoscoleces and genotype characteristics of hydatid cyst of donkey from iran were determined. methods: protoscoleces prepared from hydatid cyst of donkey of...

BACKGROUND The increasing incidence of mental health problems among young people is a major concern in many Western countries. The causal mechanisms underlying these trends are not well established, but factors influenced by current societal changes ought to be implicated. Such factors include immigration and social adversity as well as the timing of taking on adult social roles (e.g. gainful e...

behcet's disease (bd) is a multisystemic inflammatory disease that occurs most often between the second and fourth decade of life. patients have been reported during the first months of life and after 70 years. our objective was to determine the clinical, paraclinical and genetic characteristics of bd in patients aged < 20 and > 40 years. we conducted a comparative retrospective study including...

Background: Sexual reproduction affords the stands for conserving genetic characteristics and sequentially, genetic inconsistency may influence the capability to imitate. Materials and Methods: Research was conducted by subject in PubMed and other databases. Results: A significant number of genotypes have been related with infertility phenotypes and evaluation of precise genes in humans and mod...