Empirical models have sometimes been derived from these. Commercially available LPG is currently derived mainly from fossil fuels. Rather, the relevant knowledge has mostly derived from laboratory studies in rabbits. The theorem can be derived as follows. It can also be derived from microscopic considerations. Another name is derived from the names . Maltodextrin can be enzymatically derived from any starch. The name was derived from methanol. The variant may be further derived, humorously, from . These can be derived geometrically, using arguments that date to Ptolemy. They may have been derived from dermal scales. In music, many English terms are derived from Latin. Activated carbon is usually derived from charcoal. Anthocyanins are derived from anthocyanidins by adding sugars. Thought is not derived from action but tested by application.