WE have undertaken a new determination of the 'conversion factor' relating the extinction factor to the biological activity of vitamin A. For the spectrophotometric and biological investigations ...

To build proteins, cells rely on a molecule called transfer RNA, or tRNA. tRNAs act like protein-building couriers, where ...

Enzyme mechanisms articles from across Nature Portfolio Enzyme mechanisms are the chemical transformations, and the steps within them, generated by enzymatic action on substrates.