Transmembrane sodium-ion gradients provide energy that can be harnessed by 'secondary transporters' to drive the translocation of solute molecules into a cell. Decades of study have shown that such ...

Ion-gradient-coupled transport systems in plants are normally electrophoretic and carry inward current. Rapid inward electrical currents elicited by K+, by urea and by lysine in the freshwater ...

Migrating animals can bring food and contaminants to their destination. An assessment of Pacific salmon migrations from 1976 to 2015 reveals changes in the scale of this coupled transport and ...

A protein-containing fraction has been solubilized from E. coli ML 308-225 membrane vesicles that has many of the properties of the amino acid ``carrier proteins'' of the D-lactate ...

The alternative to active transport is passive transport, which uses kinetic energy only to move the molecules. Passive transport can only move molecules from a region of higher concentration to lower ...