The reopening of the Mediterranean routes in tenth century sparked, some regions Europe, a long period economic boom. It also triggered social change whereby members nobility, despite their status, turned to commerce. I explain these events through lens Kiyotaki and Wright (1989) model, extended two-country world. response elite communication shock causes economy transit from low-to high-produc...

Starting with a novel definition of divided differences, this essay derives and discusses the basic properties of, and facts about, (univariate) divided differences. “It belongs to the most beautiful I have been able to do.”[Newton 1676]

Background: This study aimed to describe the association between age groups and antimicrobial susceptibility patterns, also integron presence in Escherichia coli and Klebsiella pneumoniae  isolates from Tabriz, Iran. Materials and methods: 140 isolates of E. coli and 150 isolates of K. pneumoniae, both comprising the same number of children and adult isolates were examined for susceptibil...