title: Sodium-dependent uptake of nitrate and urea by a marine diatom.
abstract: Uptake of nitrate and urea by Phaeodactylum tricornutum is shown to be a sodium dependent process inhibited by lithium or potassium. The half-saturation constant for sodium (KNa) was 2.6 mM for nitrate uptake and 71 mM for urea uptake. It is suggested that sodium dependent uptake mechanisms may be characteristic of marine plants.
mesh_terms: D001693:Biological Transport, Active; D008094:Lithium / Q000494:pharmacology; D009566:Nitrates / Q000378:metabolism*; D010839:Phytoplankton / Q000378:metabolism*; D010933:Plankton / Q000378:metabolism*; D011188:Potassium / Q000494:pharmacology; D012964:Sodium / Q000378:metabolism*; D014508:Urea / Q000378:metabolism*
chemical_list: D009566:Nitrates; D014508:Urea; D008094:Lithium; D012964:Sodium; D011188:Potassium