title: The distribution of ammonia between extracellular and intracellular compartments of the rat brain.
abstract: 1. The distribution of ammonia between extra-and intra-cellular compartments of the brain was evaluated in anaesthetized rats exposed to sustained hyperammonaemia and superimposed acute hypo- or hyper-capnia. 2. It is concluded that the concentration gradient for ammonia between arterial plasma and cerebro-spinal fluid (CSF) cannot be explained by pH-dependent non-ionic diffusion of ammonia. A continuous uptake by the brain tissue of ammonia from the CSF is postulated and possible mechanisms are discussed.
mesh_terms: D000641:Ammonia / Q000097:blood / Q000134:cerebrospinal fluid / Q000378:metabolism*; D000818:Animals; D001921:Brain / Q000378:metabolism*; D001923:Brain Chemistry; D002245:Carbon Dioxide / Q000097:blood; D006863:Hydrogen-Ion Concentration; D008297:Male; D010100:Oxygen / Q000097:blood; D010313:Partial Pressure; D051381:Rats
chemical_list: D002245:Carbon Dioxide; D000641:Ammonia; D010100:Oxygen