专业术语—口腔生理学术语P2(英文详解)（在线收听）

    pH - a measure of how acid or alkali a solution is. As the pH gets lower, the solution is more acid. At a pH of 7 the solution is neither acid nor alkali. pH is the inverse of the logarithm of the concentration of hydrogen ions.

    Phagocytosis - the ingestion of small particles, bacteria or viruses into the cell, by engulfing it in a vacuole.

    Phosphate - a salt in which the negatively charged part is a phosphorus molecule joined to four oxygen molecules as PO4.

    Phospho-proteins - proteins which contain available phosphate groups.

    Phospholipids - are the most common lipids in our cell membranes. The head group contains a phosphate and is readily soluble in water. Phospholipids are also found inmatrix vesicles, and they provide the first step in the synthesis of prostaglandins

    Planktonic - a form of life style in which an organisms floats freely in a fluid without significant attachment or association with other living forms.

    Plaque is a film of bacteria in a matrix of salivary and bacterial polymers. It can be called a biofilm as it has a complex population of organisms which when mature, reach an ecological balance with one another.