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).
6# Keeps your skin healthy: The antioxidants present in onions prevent your skin from getting wrinkles and fine lines which appear with age. Not only this, onions also help in the treatment of acne due to its anti-microbial, anti-bacterial and anti-inflammatory qualities. 7# Boosts sperm health: Did you know eating onions could be a good way to boost sperm count and quality? Antioxidants in onions have an essential effect on sperm health.