Onion

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Yellow onions.

An onion is the common name for many plants in the genus Allium, which are characterized by a strong, pungent odor. Onions can cause tearing when cut due to a series of chemical reactions in which natural sulfoxides are converted into sulfenic acids and finally syn-propanethial-S-oxide, which evaporates into the air and irritates the eyes' lachrymal glands.[1][2]

See also

References

  1. ↑ http://www.loc.gov/rr/scitech/mysteries/onion.html
  2. ↑ http://www.sciam.com/article.cfm?id=what-is-the-chemical-proc
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