TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

The lowest concentration of a chemical used in a toxicity test that has, relative to a control, a statistically significant adverse effect on the test organism.  2, record 1, English, - lowest%2Dobserved%2Deffect%20concentration

Record number: 1, Textual support number: 1 OBS

lowest-observed-effect concentration: term used by Environment Canada.  3, record 1, English, - lowest%2Dobserved%2Deffect%20concentration

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 DEF

Concentration minimale d'une substance chimique qui cause un effet nocif statistiquement significatif dans l'organisme soumis à l'essai par comparaison avec un témoin.  2, record 1, French, - concentration%20minimale%20avec%20effet%20observ%C3%A9

Record number: 1, Textual support number: 1 OBS

concentration minimale avec effet observé : terme en usage en Environnement Canada.  3, record 1, French, - concentration%20minimale%20avec%20effet%20observ%C3%A9

Record 1,  Textual support,  Spanish

Record number: 1, Textual support number: 1 OBS

La menor concentración ensayada de la muestra de ensayo a la cual se observa un efecto significativo [...] cuando se compara con el control.  1, record 1, Spanish, - %20concentraci%C3%B3n%20m%C3%A1s%20baja%20con%20efecto%20observado

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

The highest concentration of a contaminant used in a toxicity test that has, relative to a control, no statistically significant adverse effect on the exposed population of test organisms.  2, record 2, English, - no%2Dobserved%2Deffect%20concentration

Record number: 2, Textual support number: 1 OBS

no-observed-effect concentration: term used by Environment Canada.  3, record 2, English, - no%2Dobserved%2Deffect%20concentration

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Concentration la plus forte de contaminant qui ne cause aucun effet nocif statistiquement significatif dans la population exposée d'organismes soumis à l'essai par comparaison avec des témoins.  2, record 2, French, - concentration%20sans%20effet%20observ%C3%A9

Record number: 2, Textual support number: 1 OBS

concentration sans effet observé : terme en usage à Environnement Canada.  3, record 2, French, - concentration%20sans%20effet%20observ%C3%A9

Record 2,  Textual support,  Spanish

Record number: 2, Textual support number: 1 DEF

Concentración [más alta] probada, en la que el (los) parámetro(s) medido(s) no muestra(n) una inhibición significativa del crecimiento con relación a los valores del control.  1, record 2, Spanish, - concentraci%C3%B3n%20sin%20efecto%20observable

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

The greatest concentration ... of a substance, found by experiment or observation, which causes no detectable adverse alteration of morphology, functional capacity, growth, development or life span of the target organism under defined conditions of exposure.  2, record 3, English, - no%2Dobserved%2Dadverse%2Deffect%20concentration

Record number: 3, Textual support number: 1 OBS

no-observed-adverse-effect concentration: term used by Environment Canada.  3, record 3, English, - no%2Dobserved%2Dadverse%2Deffect%20concentration

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 DEF

[...] la concentration la plus élevée n'ayant pas provoqué un effet nocif observé, par rapport à un groupe témoin, au cours d'une expérimentation animale ou d'une étude épidémiologique.  2, record 3, French, - concentration%20sans%20effet%20nocif%20observ%C3%A9

Record number: 3, Textual support number: 1 OBS

concentration sans effet nocif observé : terme en usage en Environnement Canada.  3, record 3, French, - concentration%20sans%20effet%20nocif%20observ%C3%A9

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 OBS

EC; effect concentration: This [toxicological value] is generally followed by a number, which indicates the percentage of a population which experience the effect.  2, record 4, English, - effect%20concentration

Record number: 4, Textual support number: 2 OBS

Typical levels are EC 10, EC 25, EC 50, EC 75, EC 100. NOEC: No observable effect concentration; LOEC: Lowest observable effect concentration.  3, record 4, English, - effect%20concentration

Record number: 4, Textual support number: 1 CONT

Developing Hormosira banksii embryos, used as bioassays in toxicity studies, identified ammonium as a toxicant in secondary treated sewage effluent discharged at Boags Rocks, Victoria, Australia. Ammonium did not affect fertilization but had a significant effect on germination at 48 h and cell division at 72 h with most damage occurring in the first 48 h. Ammonium showed a similar effect as whole effluent (when expressed as mg N l^-1 ammonium), sampled in June, September and November 1997, on developing H. banksii embryos. This similarity is further confirmed with comparable EC₅₀ (concentration causing an effect on 50% of the population tested) and LOEC (lowest observable effect concentration) values. Mean EC₅₀ values for the ammonium bioassays were 3.19 mg N l^-1 for germination and 6.14 mg N l^-1 for cell division.  4, record 4, English, - effect%20concentration

Record number: 4, Textual support number: 1 PHR

Effect concentration low (ECL), median effect concentration (EC50), lowest observable effect concentration (LOEC), no-observed-effect concentration (NOEC), threshold effect concentration (TEC).  5, record 4, English, - effect%20concentration

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 CONT

Concentration entraînant un effet à long terme.  2, record 4, French, - concentration%20effective

Record number: 4, Textual support number: 2 CONT

Concentration minimale produisant un effet.  3, record 4, French, - concentration%20effective

Record number: 4, Textual support number: 3 CONT

Évaluation du rapport dose (concentration)-réponse (effet). L'objectif est de déterminer la concentration en dessous de laquelle la substance ne devrait pas avoir d'effets indésirables sur la composante de l'environnement considérée. Cette concentration est dénommée concentration prévue sans effet (PNEC). Toutefois, il se peut que dans certains cas il ne soit pas possible d'établir une PNEC et il faut alors effectuer une estimation qualitative de la relation dose (concentration)-réponse (effet). Pour calculer la PNEC, on peut appliquer un facteur d'évaluation aux valeurs provenant des essais effectués sur les organismes, par exemple à la DL50 (dose létale médiane), à la CL50 (concentration létale médiane), à la CE50 (concentration effective médiane), à la CI50 (concentration provoquant cinquante pour cent d'inhibition d'un paramètre donné, par exemple la croissance), au NOEL(C) (dose (concentration) sans effet observé), au LOEL(C) (dose (concentration) entraînant l'effet observé le plus faible) ou d'autres méthodes appropriées.  4, record 4, French, - concentration%20effective

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  French

Record 5,  Textual support,  Spanish