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 ...

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 ...

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 ...

Probably each part will thus give rise to a chain of disintegrations. If one of the parts is an isotope of barium 5, the other will be krypton (Z = 92 − 56), which might decay through rubidium ...

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 ...

Wave impinging a canopy of seagrass mimics in a laboratory flume. Image credit: Marco Barretta (photographer). Seagrass beds not only provide habitat, improve water quality, and sequester organic ...

Cable bacteria (Desulfaobulbaceae) are known for their ability to conduct electricity in the form of negatively charged electrons over many millimeters. To determine whether cable bacteria can also ...

High-resolution measurement of Roman-era lead pollution in Arctic ice cores at the Desert Research Institute. Image credit: Jessi LeMay (Desert Research Institute, Reno, Nevada). Atmospheric lead ...