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Traders at the Toronto Stock Exchange, c. 1935 pose for a photograph at end of day. Note the discarded papers on the floor. End of day (EOD), end of business (EOB), close of business (COB), close of play (COP) or end of play (EOP) is the end of the trading day in financial markets, the point when trading ceases.
Abstract. Ethoxyresorufin-O-deethylase (EROD) activity is a biomarker of exposure to planar aromatic hydrocarbons, and it is often measured from the S9 fraction. The effect of the liver S9 fraction of seven boreal freshwater fish species on the fluorescence of resorufin was studied.he S9 fractions diminished resorufin fluorescence by 40â80%, and there were large differences between species. Thus, using a resorufin standard curve without the S9 fraction leads to a large underestimation of the EROD activity.