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.
This can be a lucrative career. In 2013, the median wage for an electrician was $50,510. The highest-paid earned north of $80,000, while the lowest-paid electricians earned around $30,000 that year.