Substrate transport observed activation energies

This behavior is generally observed and in this chapter, we will refer to the apparent activation energy (Ea) and the maximum growth rate in the mass-transport controlled regime. The dependence of the growth rate on the substrate temperature will only be described in detail if it differs from this behavior. 

There are two primary transport systems in neurons facilitated and active. Facilitated transport systems do not require metabolic energy from the cell. These systems are believed to be carrier mediated, since the presence of carriers can account for the kinetic findings observed in facilitated transport systems, such as saturability, competition by other substrates, and specificity toward certain families of molecules. Facilitated transport systems can... 

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