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.
Macronutrients. The four most common types of green lettuce -- green leaf, romaine, butterhead and iceberg -- have 13 to 17 calories in 100 grams, which is about a 1/2-cup serving of shredded lettuce.They deliver 1 gram of protein, or about 2 percent of the recommended daily intake.ceberg only has half the amount of iron. The same serving size of green leaf, romaine or butterhead lettuce provides 3 to 5 percent of the recommended daily intake of calcium, magnesium, phosphorus and potassium.