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.
Salary by Industry. According to May 2014 BLS figures, the top-paying industry was amusement and recreation industries, where electricians had an average annual salary of $85,190. Other top-paying industries included professional, scientific, and technical services ($81,720), natural gas distribution ($85,100), transportation equipment manufacturing ($78,290) and real estate lessors ($76,550).