نتایج جستجو برای: stable isotope geochemistry
تعداد نتایج: 287576 فیلتر نتایج به سال:
Rare earth elements (REE) and Nd isotope compositions of surface groundwaters from the Indian River Lagoon in Florida were measured to investigate influence submarine groundwater discharge (SGD) on these parameters coastal waters. The flux terrestrial component SGD is around 0.7±0.03 ?mol Nd/day per m shoreline across nearshore seepage face subterranean estuary. This translates a 4±0.2 mmol/day...
Bacteria grow and transform elements at different rates, and as yet, quantifying this variation in the environment is difficult. Determining isotope enrichment with fine taxonomic resolution after exposure to isotope tracers could help, but there are few suitable techniques. We propose a modification to stable isotope probing (SIP) that enables the isotopic composition of DNA from individual ba...
stable isotope analysis, being used in many research areas, has also been applied in archaeology during the last three decades to address questions regarding the paleoclimatology and ancient diet, mobility and migration. despite the growing number of the application of stable isotope analysis in archaeological studies, there is a very few research in this regard in archaeology of iran. this res...
Patterns of late Palaeogene mammalian evolution appear to be very different between Eurasia and North America. Around the Eocene-Oligocene (EO) transition global temperatures in the Northern Hemisphere plummet: following this, European mammal faunas undergo a profound extinction event (the Grande Coupure), while in North America they appear to pass through this temperature event unscathed. Here...
Deep basins of the North Atlantic were occupied by a cold 13 C-depleted (nutrient-rich) water mass during glaciations, and a warmer 13C-enriched (nutrient-poor) water mass (modern NADW) during interglaciations. This mode of deep-water variability is related directly to migration of the North Atlantic Polar Front. Down-core stable isotope records from the Atlantic and Antarctic suggest that 13C ...
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