Biology

Biology

A natural science concerned with the study of life or living matter in all its forms and phenomena, especially in relation to their origin, growth, reproduction, structure, behaviour and evolution.

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Biology > Toxicology

toxicity equivalency factor (in risk assessment) (TEF)

Biology; Toxicology

Ratio of the toxicity of a chemical to that of another structurally related chemical (or index compound) chosen as a reference. Factor used to estimate the toxicity of a complex ...

point mutation

Biology; Toxicology

Reaction that changes a single base pair in DNA.

sister chromatid exchange (SCE)

Biology; Toxicology

Reciprocal exchange of chromatin between two replicated chromosomes that remain attached to each other until anaphase of mitosis; used as a measure of mutagenicity of substances ...

safety

Biology; Toxicology

Reciprocal of risk: practical certainty that injury will not result from a hazard under defined conditions. Note 1. Safety of a drug or other substance in the context of human ...

risk identification

Biology; Toxicology

Recognition of a potential hazard and definition of the factors required to assess the probability of exposure of organisms or people to that hazard and of harm resulting from ...

surface layer

Biology; Toxicology

Region of space comprising and adjoining the phase boundary between a solid and liquid phase, between a solid and gas phase, or between a liquid and gas phase within which ...

temporary maximum residue limit

Biology; Toxicology

Regulatory value established for a specified, limited time when only a temporary acceptable daily intake has been established for the pesticide concerned or, with the existence of ...