The main interest of this study is to assess whether uranium deposits located in the San Marcos outcrops (NW of Chihuahua City, Mexico) could be considered as a source of U-isotopes in its surrounding environment. Uranium activity concentrations were determined in biota, ground, and surface water by either alpha or liquid scintillation spectrometries. Major ions were analyzed by ICP-OES in surf...

R. Paul Philp obtained his B.Sc. degree in chemistry from the University of Aberdeen in 1968 and his Ph.D. and D.Sc. degree from the University of Sydney in 1972 and 1998, respectively. He is currently a geochemistry professor at the University of Oklahoma. His interests include geochemical characterization of unconventional gas shales, characterization of novel biomarkers and high-molecular-we...

Stable isotopes in barnacles as a tool to understand green sea turtle (Chelonia mydas) regional movement patterns M. Detjen, E. Sterling, and A. Gómez Department of Ecology, Evolution and Environmental Biology, Columbia University, 1200 Amsterdam Avenue, New York, NY 10027, USA Center for Biodiversity and Conservation, American Museum of Natural History, 200 Central Park West, New York, NY 1002...

A Smarandache quasigroup(loop) is shown to be universal if all its f, g-principal isotopes are Smarandache f, g-principal isotopes. Also, weak Smarandache loops of Bol-Moufang type such as Smarandache: left(right) Bol, Moufang and extra loops are shown to be universal if all their f, g-principal isotopes are Smarandache f, gprincipal isotopes. Conversely, it is shown that if these weak Smaranda...

BACKGROUND Tracking small migrant organisms worldwide has been hampered by technological and recovery limitations and sampling bias inherent in exogenous markers. Naturally occurring stable isotopes of H (δ(2)H) in feathers provide an alternative intrinsic marker of animal origin due to the predictable spatial linkage to underlying hydrologically driven flow of H isotopes into foodwebs. This ap...

Non-conventional stable isotopes have received increasing attention in the past decade to investigate multi-level ecological connections from individuals ecosystems. More recently, trace and non-nutrient elements, potentially toxic (i.e., Hg), also been recognized of great significance discriminate sources, transports, bioaccumulation, as well trophic transfers. In contrast, lithium (Li) concen...