L-arginine has been studied in combination with the standard of care, oral type-5 phosphodiesterase (PDE-5) inhibitors, for erectile dysfunction. The efficacy of a combination of L-arginine, nicotinic acid, and propionyl-L-carnitine (PLC) with and without the PDE-5 inhibitor, vardenafil, was assessed in men with diabetes and erectile dysfunction.
Oroville Dam. Once called the ninth wonder of the world, the Oroville Dam is the tallest dam in the United States, besting Hoover Dam by more than 40 feet. Built between 1962 and 1968, the Oroville Dam is comprised of more than 85 million cubic yards of earth. Tours are available by appointment only.
The American Tunnel was constructed from 1959-61, extending beyond the Gold King property to the Sunnyside Mine workings. The disastrous Lake Emma flood in 1978 forced the closure of the mine. A treatment plant was commissioned for water discharges from the tunnel in the fall of 1978 and that plant was redesigned and upgraded in the late 1980s. In 1996 a bulkhead was installed at the American Tunnel portal.