A normal range for blood urea nitrogen is generally 8 to 24 mg/dL for adult men (2.86 to 8.57 mmol/L) and 6 to 21 mg/dL (2.14 to 7.50 mmol/L) for adult women. However, urea nitrogen levels vary by age. Infants have lower levels than other people do.
Fortunately, freezing zucchini and other summer squash is a snap: All you do is cut it into half-inch slices, blanch it in a pot of boiling water for three minutes, transfer it to a bowl of ice water to cool, drain it, and bag it.
Zucchini/Summer Squash Chips. Take a zucchini and/or a summer squash or two and slice them as thinly as you can, making lots of little thin round discs. Take those discs, pat them dry, then toss them in a mixture of a cup of olive oil, some salt, and some black pepper. Take the discs out of the olive oil and lay them flat on a baking sheet.