ET50

This abbreviation is used for the exposure time required to produce a defined effect when a test population is exposed to a fixed concentration or specified dose of a toxicant.
Found on http://www.encyclo.co.uk/visitor-contributions.php

et50

This abbreviation is used for the exposure time required to produce a defined effect when a test population is exposed to a fixed concentration or specified dose of a toxicant.
Found on http://www.chemicalglossary.net/definition/674-ET50
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