TY JOUR TI THE CONTENT OFORGANIC SUBSTANCE IN AQUATIC ECOSYSTEMSAS ECOLOGICAL CONDITIONINDICATOR KW aquatic ecosystem KW organic substance KW eutrophication KW dissolved oxygen KW permanganate oxidation KW saprophytic bacteria KW self-purification JO Bulletin of KSAU AU Pakusina, A.P. AU Platonova, T.P. PY 2012 IS PB Krasnoyarsk State Agrarian University