Balance the tubes by adding isopropanol or extraction buffer. Produce a pellet of DNA by centrifuging at 15,000 rpm for 15 min. Gently pour off the supernatant and lightly dry the pellets by inverting the tubes on paper towels for 1-2 min.
Onions not only provide flavor, they also provide important nutrients and health-promoting phytochemicals. High in vitamin C, onions are a good source of dietary fiber, and folic acid. They also contain calcium, iron, and have a high protein quality (ratio of mg amino acid/gram protein). Onions are low in sodium and contain no fat. Onions contain quercetin, a flavonoid (one category of antioxidant compounds).
Total Carbohydrates. A 1-cup serving of chopped, sauteed yellow onions contains 6.84 total grams of carbohydrates. This amount supplies approximately 2 percent of the recommended daily allowance of carbohydrates for adults.Each cup of yellow onion has 115 calories, with 27.4 calories provided by carbohydrates, or about 24 percent of a yellow onion's total caloric content.Compared to foods like apples, corn, bananas, bread, orange juice, beans and rice, yellow onions have a very low concentration of carbohydrates.otal Carbohydrates. A 1-cup serving of chopped, sauteed yellow onions contains 6.84 total grams of carbohydrates. This amount supplies approximately 2 percent of the recommended daily allowance of carbohydrates for adults.