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| English | Russian |
| no observed effect concentration The greatest effluent dilution which does not result in lethality that is statistically different from the control (0% effluent) at the 95% confidence level. For discharges, the critical dilution must be equal or less than the NOEC. | недействующая концентрация |
| observed amplitude | наблюденная амплитуда |
| observed arrival time | наблюденные времена первых вступлений |