| sperm-ovum interactions | Interactive processes between the ovum and the spermatozoon. (12 Dec 1998) |
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| elementary particle interactions | The interactions of particles responsible for their scattering and transformations (decays and reactions). Because of interactions, an isolated particle may decay into other particles. Two particles passing near each other may transform, perhaps into the same particles but with changed momenta (elastic scattering) or into other particles (inelastic scattering). Interactions fall into three groups: strong, electromagnetic, and weak. (12 Dec 1998) |
| food-drug interactions | The pharmacological result, either desirable or undesirable, of drugs interacting with components of the diet. (12 Dec 1998) |