Inhibition of light-induced pH increase and O2 evolution of marine microalgae by water-soluble components of crude and refined oils.
Light-induced alkalinization of the extracellular medium was found to be a common feature of the primary photosynthetic process of several marine microalgae. The light-induce PH increase of suspensions of whole cells was immediately and severely inhibited by a single dose of water-soluble components from crude and fuel oils. Differential effects on the rates of microalgal photosynthetic O2 evolution and cell suspension pH increase suggest different toxicity mechanisms of the water-soluble components of no. 2 fuel oil as compared with Southern Louisiana and Jay Crude oils. These short-term studies on the nature of sublethal petroleum toxicity to microalgae indicate that the primary effect may be through direct action on the energy-yielding electron transport systems.
D056890:Eukaryota / Q000378:metabolism*; D005648:Fuel Oils; D006838:Hydrocarbons / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008027:Light; D010100:Oxygen / Q000378:metabolism*; D010578:Petroleum; D010788:Photosynthesis; D012623:Seawater; D014871:Water Microbiology
D005648:Fuel Oils; D006838:Hydrocarbons; D010578:Petroleum; D010100:Oxygen