title: Inhibition of NO3-, NH4+, and PO4(3-) uptake in Anabaena doliolum exposed to a petroleum oil.
abstract: The aqueous extract of Assam crude inhibited the uptake of NO3-, NH4+, and PO4(3-) in Anabaena doliolum and the response was essentially concentration dependent. Inhibition was most severe for the uptake of NH4+ followed in decreasing order by PO4(3-) and NO3-. Uptake of nutrients was competitively inhibited as in all the cases oil extract did not change Vmax; however, apparent Km was increased. The nature of oil components competing with nutrient ions is not certain at present. Oil-induced inhibition of nutrient uptake in cyanobacteria might be reversed in eutrophic waters rich in nutrients.
authors.affiliation: Department of Botany, School of Life Sciences, North-Eastern Hill University, Shillong, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Singh
authors.forename: J P
authors.initials: JP
authors.lastname: Gaur
mesh_terms: D000641:Ammonia / Q000493:pharmacokinetics*; D003470:Culture Media; D000458:Cyanobacteria / Q000187:drug effects / Q000378:metabolism*; D009566:Nitrates / Q000493:pharmacokinetics*; D010578:Petroleum / Q000633:toxicity*; D010710:Phosphates / Q000493:pharmacokinetics*
chemical_list: D003470:Culture Media; D009566:Nitrates; D010578:Petroleum; D010710:Phosphates; D000641:Ammonia