23 BEITRÄGE
PNAS is one of the world's most-cited and comprehensive multidisciplinary scientific journals, publishing more than 3,500 research papers annually. As the flagship peer-reviewed journal of the National Academy of Sciences (NAS), PNAS serves as an authoritative source of high-impact, original research that spans the biological, physical, and social sciences, with global reach and open submission to researchers worldwide.
Fluid polarity shifts initiate and amplify preferential flow in clay-rich media
Preferential flow plays a crucial role in fluid and solute transport and is typically attributed to static heterogeneity in pore structures. Here, we demonstrate...
The 2026 western US snow drought was about four times more likely due to climate change
In the spring of 2026, anomalously low snow conditions in the western United States threatened winter recreation and water supplies. Here, we investigate: to...
Rapidly evolving composition of nebular infall recorded by magnesium isotopes in refractory inclusions
As the oldest solids formed in our Solar System, refractory inclusions provide direct evidence of the earliest stages of its evolution. We show that...
Disentangling dissociative and nondissociative reaction dynamics in molecular mutual neutralization reactions between CO+ and O−
The products and dynamics in mutual neutralization (MN) of CO+with O−occurring in planetary atmospheres and cometary comae are unknown, accessible only through new approaches...
Differences in physiological tolerance to global warming caused the Permian–Triassic transition between the Paleozoic and Modern faunas
The well-established faunal turnover event between the Paleozoic fauna (e.g., brachiopods, crinoids) and the Modern fauna (e.g., clams, snails, urchins) coincided with intense global...
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