Activity characteristic of life, such as reproduction, growth, or metabolism.

A protein's ability to function correctly after it has been delivered to the active site of the body (in vivo).

Bioactivity is the combination of Energy Flow, Productivity, Biomass and the Resource Cycles, measured by the speed of the resource cycles. It thus describes the living activities of an Ecosystem.

a material that elicits a specific biological response at the interface of the material which results in the formation of a bond between tissues and the material.