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.
Biological formation of the terpenes occurs by the combination of two molecules of acetic acid to give mevalonic acid (C6H12O4) and conversion of the latter to isopentenyl pyrophosphate, which contains the five-carbon isoprene skeleton.