Proceedings of the National Academy of Sciences (PNAS)

Could dark energy be changing over time?

Einstein’s version of dark energy is known as the cosmological constant. It implies a fixed amount of dark energy in each ...
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

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

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

Membrane properties of living mammalian cells as studied by enzymatic hydrolysis of fluorogenic esters.

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

Terms of Use and Access

PNAS Terms of Access: “Proceedings of the National Academy of Sciences” and “PNAS” are registered trademarks of the National Academy of Sciences of the United ...
PNAS

The Shared-Electron Chemical Bond

The Shared-Electron Chemical BondNote: 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 ...