Treatment of a substance by heat, radiation, or activating reagent to produce a more complete or rapid chemical or physical change.

The process of adding liquid to a manufactured cell or battery to make it operative.

The process of treating the cathode or target of an electron tube to increase its emission. Also known as sensitization.

1. A process of facilitating the separation and collection of ore powders by the use of substances which change the response of the particle surfaces to a flotation fluid.

2. A process that increases the rate of pressing and heating a metal powder into cohesion.

A change that is induced in an amino acid before it is utilized for protein synthesis.

The process of inducing radioactivity by bombardment with neutrons or with other types of radiation.

The designation for all changes in the ovum during fertilization, from sperm contact to the dissolution of nuclear membranes.