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.
Soil pH measures the acidity of the soil. Romaine lettuce requires a neutral pH between 6.0 and 6.5. Existing successful vegetable garden soil usually falls within this range. For new beds, a soil test determines the pH. Use a home testing kit or take a soil sample to a testing laboratory to determine pH.omaine lettuce (Lactuca sativa) produces an upright head of large loose leaves. The crisp leaves and firm central rim make it a prized fresh addition to salads. Like most lettuce, romaine grows best in cool weather when the temperatures are above freezing, but below 80 degrees Fahrenheit.