Proceedings of the National Academy of Sciences (PNAS)

Energy costs of Hannibal’s alpine crossing

Hannibal crossed the Alps with a large army containing 37 war elephants in 218 BC. Details of his route have scholars ...
PNAS

Early evidence for a stable and flexible foraging niche in the evolution of Homo

The Koobi Fora Formation preserves a rich Plio-Pleistocene record of hominins, fauna, and environments, providing a cornerstone for understanding human evolution. Nearly all zooarchaeological evidence ...
PNAS

EPIGENETIC CONTROL SYSTEMS

Aided by grants from the National Science Foundation. This essay is based on remarks given at a conference on “Extrachromosomal Heredity” held at Gif-sur-Yvette, France, in March, 1958. The conference ...
PNAS

Acoustical Impedance and the Theory of Horns and of the Phonograph

Note: The article usage is presented with a three- to four-day delay and will update daily once available. Due to ths delay, usage data will not appear immediately following publication. Citation ...
PNAS

The Structure of Atoms and the Octet Theory of Valence

Note: The article usage is presented with a three- to four-day delay and will update daily once available. Due to ths delay, usage data will not appear immediately following publication. Citation ...
PNAS

Hamiltonian Systems and Transformation in Hilbert Space

Hamiltonian Systems and Transformation in Hilbert Space Note: The article usage is presented with a three- to four-day delay and will update daily once available. Due to ths delay, usage data will not ...
PNAS

From molecular motors to chromosome architecture

From molecular motors to chromosome architecture The President’s Council of Advisors on Science and Technology has called for a 33% increase in the number of science, technology, engineering, and ...
PNAS

Plant species invasions and community composition processes

Plant species invasions and community composition processes Join the global community of subscribers to PNAS, the flagship journal of the US National Academy of Sciences, a mission-driven nonprofit ...
PNAS

Ferment to survive: How an aerobic bacterium persists during hypoxia

Work in the lab of R.G.S. is supported by the German Research Council (grants SA 494/9-1 and SA 494/11-1). D. L. Gillett et al., Aerobic soil bacteria adapt to hypoxia by hybridizing fermentation with ...
PNAS

In This Issue

Animal pollination benefits 75% of major crops and plays a crucial role in global food production. However, wild pollinators are declining in abundance and diversity. To examine how the decline in ...
PNAS

Editorial and Journal Policies

The PNAS Editorial Board is made up of NAS members who are active scientists and experts in their fields. On submission, your paper is assigned to an Editorial Board member in one of the 31 NAS ...
PNAS

Submissions Contributed by NAS Members

NAS members may contribute up to two research manuscripts annually, which must be within the member’s area of expertise and in which the member had a direct, significant role in the design and ...