The team then measured the composition of three different oxygen isotopes. Isotopes are atoms of the same element that have varying numbers of neutrons, which changes their mass — the more ...

Clement Bataille, Associate Professor at uOttawa’s Faculty of Science, highlighted their method: “By analyzing hydrogen and strontium isotopes, we traced these butterflies back to their ...

They utilized isotope geolocation to estimate the geographic origin of each butterfly. “The key principle of this method is that the isotopic makeup—or the stable isotopes—of the adult ...

The results were published in the Proceedings of the National Academy of Sciences (PNAS). The researchers analysed oxygen isotopes from 14 samples from the Moon and carried out 191 measurements on ...

Collagen was extracted and analyzed for bulk stable isotopes of carbon-13 (δ 13 C) and nitrogen-15 (δ 15 N) and compound-specific isotopes of individual amino acids. Radiocarbon dating provided ...

Carbon and nitrogen isotope ratios in dentine from the first permanent molars record diet from three months to about nine years of age. In particular, breast milk has a high nitrogen-15 to ...

The Boise State University Isotope Geology Laboratory (IGL) is a state-of-the-art geoanalytical facility for the analysis of trace elements and radiogenic isotopes in Earth materials, using both ...

Introduction: Recent work has proposed that the nitrogen isotopes in marine sediments can be impacted by anaerobic oxidation of methane (AOM), since nitrogen uptake by anaerobic methanotrophic archaea ...

Since 2002, PNAS has offered free and immediate access to journal content for researchers in an initial group of 81 countries, a number that has grown to over 120 lower-income countries. This access ...