title: Common nitrogen control of caesium uptake, caesium toxicity and ammonium (methylammonium) uptake in the cyanobacterium Nostoc muscorum.
abstract: Studies were carried out to examine the role of ammonium transport activity in the control of caesium uptake and toxicity in Nostoc muscorum. The results showed a definite specific role of the ammonium-repressible/derepressible ammonium transport system of the cyanobacterium in caesium uptake, accumulation and toxicity. Furthermore, the results showed that N. muscorum can acquire resistance against diazotrophically-associated caesium toxicity when supplied with ammonium as a nitrogen source. In addition, alternatively, a mutant strain was Cs-resistant in the absence of any effect on NH(+4)-transport, suggesting that Cs+ resistance may be determined at more than one cellular site.
authors.affiliation: Department of Biological Sciences, Rani Durgavati University, Jabalpur, India.
authors.forename: S
authors.initials: S
authors.lastname: Singh
authors.forename: S
authors.initials: S
authors.lastname: Negi
authors.forename: N
authors.initials: N
authors.lastname: Bharati
authors.forename: H N
authors.initials: HN
authors.lastname: Singh
mesh_terms: D001692:Biological Transport; D002586:Cesium / Q000493:pharmacokinetics / Q000633:toxicity*; D000458:Cyanobacteria / Q000378:metabolism*; D008744:Methylamines / Q000493:pharmacokinetics*; D009584:Nitrogen / Q000378:metabolism*
chemical_list: D008744:Methylamines; D002586:Cesium; C027451:methylamine; D009584:Nitrogen