Vocabulary: words definition and meanings

Hydrate

Crystalline form of a compound in which water molecules are part of the crystal structure.

Hydrophile–lipophile Balance System

Empirical scale (of 0–20) used to classify surfactants and emulsifying agents.

Hydrophilicity

Tendency of a molecule to be solvated by water.

Hydrophobicity

Property of being water-repellent; tending not to absorb water.

Hygroscopicity

Tendency of a substance to absorb water from the atmosphere.

Hapten

a molecule that is too small to be antigenic alone but becomes antigenic when conjugated to a larger protein molecule

Helicase

enzyme that unwinds DNA by breaking the hydrogen bonds between the nitrogenous base pairs, using ATP

Helper T Cells

class of T cells that is the central orchestrator of the cellular and humoral defenses of adaptive immunity and the cellular defenses of innate immunity