As an essential amino acid, leucine cannot be synthesized by animals. Consequently, it must be ingested, usually as a component of proteins. In plants and microorganisms, leucine is synthesised from pyruvic acid by a series of enzymes:
Electricians in California earned an average of $27.33 per hour and $56,840 per year as of May 2009, according to the U.S. Bureau of Labor Statistics. Average annual salaries in California were more than 11 percent above the U.S. national average of $50,850.
National Salary Statistics. Information published by the Bureau of Labor Statistics indicates that electricians working in the United States earned an average salary of $52,910 per year and an average wage of $25.44 per hour as of May 2011.