Cellular production of nitric oxide (NO) by nitric oxide synthase (NOS) in the face of limiting pools of arginine requires the intracellular citrulline-to-NO pathway, catalyzed by the enzyme ...

A century ago, the strange behavior of atoms and elementary particles led physicists to formulate a new theory of nature. That theory, quantum mechanics, found immediate success, proving its worth ...

Imaginary numbers might seem like unicorns and goblins — interesting but irrelevant to reality. But for describing matter at its roots, imaginary numbers turn out to be essential. They seem to be ...