the concentration which affects 50 % of a test population after a specified exposure time; usually relates to effects other than lethality (e.g. immobilization, growth rate, equilibrium, development abnormality or deformity), ainesisaldus, mis kahjustab keskmiselt pooli katseorganismidest

an economic and political association of European States that came into being in 1967, when the legislative and executive bodies of the European Economic Community merged with those of the European Coal and Steel Community and the European Atomic Energy Community: subsumed into the European Union in 1993, the former W European economic association created by the Treaty of Rome in 1957; in 1967 its executive and legislative bodies merged with those of the European Coal and Steel Community and the European Atomic Energy Community to form the European Community (now part of the European Union)

coefficient by which pollutants emitted by a combustion engine increase or decrease over a given time period of engine operation

a patient characterized by undetectable plasma viral loads for extended periods of time in the absence of ART, a subset of HIV-infected individuals who maintain plasma viral loads to levels below the limits of clinical detection (<50–75copies/ml) in the absence of anti-retroviral therapy, sujet non progresseur à long terme et séropositif non traité aux antirétroviraux, qui maintient une charge virale indétectable correspondant à moins de 50 copies de VIH par millilitre de sang