Public Variables. 1  Create a variable in the Command window. 2  Any variable created in the Command window is automatically declared public. 3  For example, from the Command window, type X=1000. 4  The variable X is now public to all applications. 5  Within a program, declare a variable as public by using the PUBLIC command. Create a variable in the Command window. 2  Any variable created in the Command window is automatically declared public. 3  For example, from the Command window, type X=1000. 4  The variable X is now public to all applications.
Any of various unsaturated hydrocarbons in essential oils and certain resins of plants and used in organic syntheses. terpene. Any of a class of hydrocarbons consisting of two or more isoprene (C5H8) units joined together. Simple terpenes are found in the essential oils and resins of plants such as conifers.
Steroids. The important class of lipids called steroids are actually metabolic derivatives of terpenes, but they are customarily treated as a separate group. Steroids may be recognized by their tetracyclic skeleton, consisting of three fused six-membered and one five-membered ring, as shown in the diagram to the right.