Receive emails about upcoming NOVA programs and related content, as well as featured reporting about current events through a science lens. Our first question was about the concept of molecular ...

Students learn how to predict the shape of a molecule based on the electron dot diagram. Covalent Bonds: Students learn how to predict the shape of a molecule based on the electron dot diagram and to ...

Permeation of active drugs across the vascular brain endothelium into the central nervous system (CNS) is controlled by the blood-brain barrier (BBB). The BBB separates the bloodstream from the brain.

(Nanowerk Spotlight) Water bodies have absorbed millions of tons of plastic debris since mass production began in the 1950s. As these materials degrade, they break into microscopic and nanoscale ...

Iron (III) forms an octahedral geometry with siderophores via Fe-O and/or Fe-N bonds. In this study semi-empirical (PM3) calculations are used to estimate the number of stable complexes possible ...

The spatial distribution of molecular signals within cells is crucial for cellular functions. Here, as a model to study the polarized spatial distribution of molecular activities, we used cells on ...

This is a preview. Log in through your library . PNAS is the world's most-cited multidisciplinary scientific serial. It publishes high-impact research reports, commentaries, perspectives, reviews, ...