Curium is a hard, brittle, radioactive silvery metal. It does not occur in nature and must be made in a nuclear reactor by neutron capture reactions from plutonium and americium isotopes. It tarnishes slowly in dry air at room temperature.
Romaine lettuce is a rich source of fiber and has very few calories, only 8 in a one-cup serving. In terms of vitamins, a cup of Romaine lettuce delivers more than 50% of your daily requirement for vitamin A, as well as significant levels of vitamin K and vitamin C.
Lutein and Zeaxanthin. Romaine lettuce contains 1,087 mgs of lutein and zeaxanthin â carotenoids that filter harmful high-energy blue wavelengths of light on the retina, says the American Optometric Association (AOA). Iceberg lettuce only contains 199 mgs of these two nutrients. The recommended amount of lutein is six to 10 mg per day, whereas the dose for zeaxanthin is 2 mg per day, to maximize the health benefits for your eyes.