Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Cytoarchitectural model of nutrient kinetics. Ambient nutrient S diffuses through a porin to periplasmic concentration ([SP]), where it combines with a proton-empowered permease having an active-site radius of rs. Transport produces a [Sc] that generates both a proton potential and a concentration-driving force that facilitates substrate flow through an enzyme sequence (E) to produce cell material (X).
