The speed of diffusion across the OM through non-specific porins and receptors is dependent on the concentration gradient, but the speed increases only up to the saturation concentration through the porins and receptors specific for that nutrient.
The speed of diffusion across the OM through non-specific porins and receptors is dependent on the concentration gradient, but the speed increases only up to the saturation concentration through the porins and receptors specific for that nutrient.