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Possible definitions for vaseline
gasoline
Mixture of volatile, flammable hydrocarbons derived from petroleum, used as fuel for internal combustion engines (also as a solvent for oils and fats). Gasoline became the preferred automobile fuel because it releases so much energy when burned, it mixes readily with air in a carburetor, and initially was cheap due to a large supply. Costs have now increased greatly except where subsidized. Gasoline was first produced by distillation. Later processes increased the yield from crude oil by splitting large molecules into smaller ones. Still other methods, such as conversion of straight-chain hydrocarbons into their branched-chain isomers, followed. The result is a complex mixture of hundreds of hydrocarbons. A gasoline's octane number indicates its ability to resist knocking (which means combustion is too rapid) and can be altered by changing the proportions of certain components. Lead, once used to reduce knocking, has been banned as toxic. Other additives include detergents, antifreezes, and antioxidants. Since the mid-20th cent. gasoline fumes have been a major component of urban air pollution. Efforts to reduce dependence on gasoline, which is a nonrenewable resource, include use of "gasohol," a 90:10 mix of gasoline and ethanol, and the development of electric automobiles.
valine
One of the essential amino acids, found in most proteins. Produced industrially by hydrolysis of proteins or by chemical synthesis, it is used in biochemical and nutritional research and as a dietary supplement.
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