Buscar
Mostrando ítems 1-10 de 1810
Isotopic carbon turnover in pig hoof and rib
(Editora da Universidade Estadual de Maringá - EDUEM, 2021-06-14)
The objective of this study was to evaluate the behavior of carbon incorporation and turnover in hoof and ribs of pigs at different periods of development in the search for tissues that reflect longer the former diet. We ...
Sm-Nd system in total rock open versus closed isotopic composition in zones of high deformation
(2002-12-01)
High strain shear zones of Brasiliano age, developed in Paleoproterozoic basement gneiss of the Caicó region, Borborema Province, NE Brazil, were associated with medium- to low-grade metamorphism and deformational processes ...
The U-isotopes modeling in aquifers from Pocos de Caldas plateau, Brazil
(Springer, 2005-08-01)
U-modeled groundwater residence times were estimated by changes in U-234/U-238 activity ratio (AR) and U content of groundwaters from Pocos de Caldas city situated at the Pocos de Caldas alkaline massif, Brazil. The estimated ...
The U-isotopes modeling in aquifers from Pocos de Caldas plateau, Brazil
(Springer, 2005-08-01)
U-modeled groundwater residence times were estimated by changes in U-234/U-238 activity ratio (AR) and U content of groundwaters from Pocos de Caldas city situated at the Pocos de Caldas alkaline massif, Brazil. The estimated ...
Groundwater isotope ratios reflect convective and stratiform (paleo)precipitation fractions in Brazil
(2020-06-01)
The stable isotope ratios of oxygen and hydrogen in shallow groundwater reflect the long-term amount-weighted mean isotopic composition of precipitation. Here, we report the isotopic composition of more than 1000 shallow ...