Proceedings of the National Academy of Sciences (PNAS)

Identifying variation in dinosaur footprints and classifying problematic specimens via unbiased unsupervised machine learning

Machine learning holds great promise for classifying and identifying fossils, and has recently been marshaled to identify trackmakers of dinosaur ...
Proceedings of the National Academy of Sciences (PNAS)

Table Of Contents Page, PNAS Volume 123, Number 6

The Middle Pleistocene (MP; ca. 774 to 129 ka) marks a critical period of human evolution, characterized by increasing ...
PNAS

Extreme triple oxygen isotope fractionation in Equisetum

Isotopic enrichment in Equisetum is extreme due to evaporative water loss along the entire plant stem. The Equisetum data extend the known oxygen isotope range of samples from Earth and our entire ...
PNAS

MALT1 inhibitor MI-2 induces ferroptosis by direct targeting of GPX4

Ferroptosis, a form of cell death driven by excessive lipid peroxidation, is induced by inhibiting GPX4, a key regulator of ferroptosis. Wang et al. reported that MALT1 protease activity regulates ...
PNAS

Catabolic repression of bacterial sporulation.

Catabolic repression of bacterial sporulation. 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 ...
PNAS

Front Matter

Dive into PNAS Front Matter for editorials, interviews, science news, and commentary that offer expert perspective on today’s most important research findings.
PNAS

Absolute and Unconditional Convergence in Normed Linear Spaces

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

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

Fermi surface nesting induced strong pairing in iron-based superconductors

The discovery of high-temperature superconductivity in iron pnictides raised the possibility of an unconventional superconducting mechanism in multiband materials. The observation of Fermi-surface ...
PNAS

Rate enhancement of bacterial extracellular electron transport involves bound flavin semiquinones

Abstract Extracellular redox-active compounds, flavins and other quinones, have been hypothesized to play a major role in the delivery of electrons from cellular metabolic systems to extracellular ...
PNAS

The molecular basis for the chemical denaturation of proteins by urea

Molecular dynamics simulations of the protein chymotrypsin inhibitor 2 in 8 M urea at 60°C were undertaken to investigate the molecular basis of chemical denaturation. The protein unfolded rapidly ...
PNAS

Programmable transdermal drug delivery of nicotine using carbon nanotube membranes

Edited by Mildred Dresselhaus, Massachusetts Institute of Technology, Cambridge, MA, and approved May 13, 2010 (received for review April 8, 2010) ...