Amazon River propagation evidenced by a CO2 decrease at 8°N, 38°W in September 2013

Assessment of Cd, Cr and Pb Pollution in Sediment and Water of Gheshlagh River, Iran, in September 2013

Background: This study aimed to evaluate the pollution levels of surface water with heavy metals including Pb, Cd and Cr in Gheshlagh River, western Iran. Methods: Water and sediment were sampled in five monitoring stations with three replicates in time along the river. The concentration of Cr, Pb and Cd in both water and sediment samples were measured with graphite furnace atomic absorption ...

In the September 2013 issue

An extensive reef system at the Amazon River mouth

Large rivers create major gaps in reef distribution along tropical shelves. The Amazon River represents 20% of the global riverine discharge to the ocean, generating up to a 1.3 × 10(6)-km(2) plume, and extensive muddy bottoms in the equatorial margin of South America. As a result, a wide area of the tropical North Atlantic is heavily affected in terms of salinity, pH, light penetration, and se...

Package ‘ surveillance ’ September 9 , 2013

Package ‘ Zelig ’ September 21 , 2013

Description Zelig is an easy-to-use program that can estimate, and help interpret the results of, an enormous range of statistical models. It literally is ‘‘everyone’s statistical software’’ because Zelig’s simple unified framework incorporates everyone else’s (R) code. We also hope it will become ‘‘everyone’s statistical software’’ for applications and teaching, and so have designed Zelig so t...