An ad valorem duty is an import tax that is a fixed percentage of the price of the article, whereas a specific duty is fixed amount per unit of measurement of the imported article. When abbreviations first came into use, they consisted only of a single letter. The magazine in its early years of publication stimulated its readers to thought by its impartial presentation of divergent and conflicting viewpoints on almost all subjects. Through the years, its editorial policy has evolved into rigid dogmatism, and each page of every issue seems to be stamped from one die. There is a verb in the English language that comes from the name of a mythical Greek king who was fated forever to stand chin-deep in a lake whose waters eluded him whenever he tried to drink.
Enzymes are chemicals involved in digestion.
Every enzyme has a specific function. One that is necessary for a given chemical reaction may be totally without effect in another. There are in the body separate and distinct enzymes for digesting carbohydrates, fats, and proteins. In the digestion, any one of these compounds, more than a single enzyme may be involved. The breakdown of carbohydrates, for example, is begun by the saliva in the mouth, but is completed by the activity of another enzyme.