Lack of constraint on spatial and long-term temporal variability the El Niño southern Oscillation (ENSO) its sensitivity to external forcing limit our ability evaluate climate models ENSO future projections. Current knowledge Holocene derived from paleoclimate reconstructions does not separate role insolation internal variability. Using an updated synthesis coral bivalve monthly resolved record...

Since the epoch making discoveries of Hellriegel~ there have followed in quick succession many series of investigations relative to the hxation of atmospheric nitrogen by living organisms. Especially brilliant are the investigations of Winogradskyt on Clostridium pastorianum and those of Beyerincka on the Azotobacter group, and it is unnecessary here to go into a review of the investigations wh...

introduction. in order to improve planning, educational methodology, and evaluation in medical education, well-proportioned, exact and prospective programs are needed. without doubt, the main changes in medical education programs have resulted from researches performed in this area during the last decades. revision of medical education in iran began by the cultural revolution council by order o...