title: Ammonium (methylammonium) transport by heterocysts and vegetative cells of Anabaena variabilis.
abstract: Transport of the ammonium analogue [(14)C]methylammonium was similar in non-growing, fully differentiated heterocysts as compared to vegetative, multiplying cells of the filamentous cyanobacterium Anabaena variabilis. NH(4)(+) inhibited uptake into the cells and released accumulated methylammonium from the cells. These observations suggest that the main function of ammonium transport in heterocysts may not be NH(4)(+) acquisition but cyclic retention of ammonia produced by nitrogenase.
authors.affiliation: Mikrobiologie, Universität, D-95440, Bayreuth, Germany.
authors.forename: R M
authors.initials: RM
authors.lastname: Shehawy
authors.forename: D
authors.initials: D
authors.lastname: Kleiner
mesh_terms: D000643:Ammonium Chloride / Q000494:pharmacology; D017033:Anabaena / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D003470:Culture Media / Q000737:chemistry; D008744:Methylamines / Q000037:antagonists & inhibitors / Q000378:metabolism*; D013997:Time Factors
chemical_list: D003470:Culture Media; D008744:Methylamines; D000643:Ammonium Chloride; C027451:methylamine