Gastric perforation is a life-threatening condition encountered in surgical emergency.Common conditions that cause gastric 5326058hx perforation requiring emergency exploration include peptic ulcers, trauma, iatrogenic injuries and corrosive burns.Gastroduodenal region is the most common site of perforation but perforation in fundus of stomach is u
In this review, we summarize the state of knowledge of the influence of light on the activity and physiology of elasmobranchs (sharks, skates, rays, and sawfish).These are a diverse group with great economic and ecological importance.The long-term success of a species is largely determined by its ability to respond to changes in its environment.Lig
Among extant vertebrates, pneumatization of postcranial bones is unique to birds, with few known exceptions in other groups.Through reduction in bone mass, this feature is thought to benefit flight capacity in modern birds, but its prevalence in non-avian dinosaurs of variable sizes has generated competing hypotheses on the initial adaptive signifi