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What Is the Advance-Decline Line? What Does It Tell the Technician

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What is the advance-decline line? What does it tell the technician?


Definitions:

Hydrophilic Region

A part of a molecule that has affinity for water and can form hydrogen bonds with water molecules.

Hydrophobic Region

A part of a molecule that is repelled by water and typically soluble in nonpolar solvents.

Hydrogen Bond

A weak bond formed between a hydrogen atom in one molecule and an electronegative atom, such as oxygen or nitrogen, in another molecule, important in the structure of water and biological molecules.

Polar Covalent Bond

A type of chemical bond where a pair of electrons is unequally shared between two atoms.

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