Proceedings of the National Academy of Sciences (PNAS)

Earliest evidence of smoke-dried mummification: More than 10,000 years ago in southern China and Southeast Asia

This finding documents smoke-dried mummification of the dead, mostly in tightly bound crouched postures, from archaeological ...
PNAS

Publication Charges

PNAS depends, in part, on the payment of article processing charges (APCs) to finance its operations. Papers are accepted or rejected for publication and published solely on the basis of merit. For ...
PNAS

BEHAVIORAL MUTANTS OF Drosophila ISOLATED BY COUNTERCURRENT DISTRIBUTION

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

Dynamical Systems of Continuous Spectra

Dynamical Systems of Continuous SpectraNote: 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 ...
PNAS

Rates of change in natural and anthropogenic radiative forcing over the past 20,000 years

Open in Viewer Evolution of atmospheric CO 2 (a), methane (b), and nitrous oxide (c), and sampling intervals (d) over the past 20,000 years. The gray bar denotes the range of the preindustrial, ...
PNAS

Greenhouse gas mitigation by agricultural intensification

Edited by G. Philip Robertson, W. K. Kellogg Biological Station, Hickory Corners, MI, and accepted by the Editorial Board May 4, 2010 (received for review December 9, 2009) The second counterfactual ...
PNAS

Atmospheric composition 1 million years ago from blue ice in the Allan Hills, Antarctica

Bubbles of ancient air trapped in ice cores permit the direct reconstruction of atmospheric composition and allow us to link greenhouse gases and global climate over the last 800 ky. Here, we present ...
PNAS

US particulate matter air quality improves except in wildfire-prone areas

Wildfires are a major source of fine particulate matter (diameter <2.5 µm; PM 2.5), which is a health hazard. Since the mid-1980s, the total US area burned by wildfires has been increasing, with fires ...
PNAS

Soil warming, carbon–nitrogen interactions, and forest carbon budgets

Soil warming has the potential to alter both soil and plant processes that affect carbon storage in forest ecosystems. We have quantified these effects in a large, long-term (7-y) soil-warming study ...
PNAS

Spontaneous knotting of an agitated string

Formation of knots in mathematical self-avoiding random walks has been extensively studied (10 – 16). In the 1960s, Frisch and Wasserman (10) and Delbruck (11) conjectured that the probability of ...
PNAS

Temperature-memory polymer actuators

Edited by Alexander M. Klibanov, Massachusetts Institute of Technology, Cambridge, MA, and approved June 12, 2013 (received for review January 30, 2013) We hypothesized that a temperature-memory ...
PNAS

Alcohol-sensitive GABA receptors and alcohol antagonists

Taken together, these findings suggest that a subtype of extrasynaptic GABA A receptor that contains δ subunits and gives rise to tonic (sustained) GABAergic inhibition in brain (21) is indeed an ...