title: The transport of NH3 and NH4+ across biological membranes.
mesh_terms: D000641:Ammonia / Q000378:metabolism*; D000818:Animals; D001419:Bacteria / Q000378:metabolism; D001692:Biological Transport; D002412:Cations; D004734:Energy Metabolism; D005658:Fungi / Q000378:metabolism; D008566:Membranes / Q000378:metabolism*; D009586:Nitrogen Fixation; D010944:Plants / Q000378:metabolism; D013045:Species Specificity
chemical_list: D002412:Cations; D000641:Ammonia