Institutional legitimacy is essential for democracies, yet public trust and confidence in the United States Congress are at an all-time low. A significant predictor of attitudes toward Congress is ...

We are updating our policy regarding the availability of data, with an emphasis on visual data, effective January 1, 2024. Image credit: François Parcy. PNAS strives to promote and endorse best ...

The world is in a battle for truth. A cadre of researchers is eagerly seeking ways to stymie the spread of mis- and disinformation. The stakes are high. Social media have become an accelerant for the ...

The enzymatic conversion of heme to bilirubin by microsomal heme oxygenase. R Tenhunen, H S Marver, and R Schmid Authors Info & Affiliations ...

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 ...

Minimax Theorems* 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 ...

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 ...

FOSSILS, EARLY LIFE, AND ATMOSPHERIC HISTORY ...

Various self-service options are available to institutional administrators at subscribing institutions. Select a topic below for step-by-step instructions and video guides. New administrators must ...

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 ...

Open in Viewer (A) Schematic of a photocell consisting of quantum dots sandwiched between p and n doped semiconductors. Open circuit voltage and solar photon energy ℏνh are related by the Carnot ...

Open in Viewer Illustration of the HC and its relationship to the midlatitude baroclinic eddies: (A) climatology in current climate; (B) the weaker and broader HC projected by many CMIP3 and CMIP5 ...