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

No evidence of continuously advanced green-up dates in the Tibetan Plateau over the last decade

Satellite-derived greenness vegetation indices provide a valuable way to retrieve spatially continuous information about phenological change and have been thus widely used to assess the influences of ...
PNAS

Attenuation of sinking particulate organic carbon flux through the mesopelagic ocean

Edited by David M. Karl, University of Hawaii, Honolulu, HI, and approved December 9, 2014 (received for review August 8, 2014) ...
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

VALUATION EQUILIBRIUM AND PARETO OPTIMUM

Based on Cowles Commission Discussion Paper, Economics, No. 2067 (January, 1953). This article has been prepared under contract Nonr-358(01), NR 047-006 between the Office of Naval Research and the ...
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

Comparison of the Statically and Seismologically Determined Elastic Constants of Rocks

Paper No. 5 published under the auspices of the Committee on Geophysical Research and of the Division of Geological Sciences at Harvard University. Note: The article usage is presented with a three- ...
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

Mechanism of action of streptomycin in E. coli: interruption of the ribosome cycle at the initiation of protein synthesis.

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 Isolation and Culture of Gymnosporangium Juniperi-Virgininae Schw. Upon Artificial Media

Research Fellow, Div. of Plant Pathology and Botany, Univ. of Minnesota, St. Paul, Minn. This research was supported in part by a grant from the Rockefeller Foundation to the Dept. of Plant Science, ...
PNAS

Journal Club

Journal Club posts are short news stories featuring a recent important, timely journal article selected by one of our Journal Club panelists, who are post-doctoral associates and graduate students in ...