Workup. 1  Saylam G, Tanrikulu S, Dursun E, Iriz A, Eryilmaz A. A mass at fat density in the parotid gland: dermoid cyst or lipoma. B-ENT. 2009. 2  Sandborn WD, Shafer AD. A branchial cleft cyst of fourth pouch origin. 3  Thompson LD, Herrera HB, Lau SK. A Clinicopathologic Series of 685 Thyroglossal Duct Remnant Cysts.
Ozone forms readily in the stratosphere as incoming ultraviolet radiation breaks molecular oxygen (two atoms) into atomic oxygen (a single atom). In that process, oxygen absorbs much of the ultraviolet radiation and prevents it from reaching the Earthâs surface where we live.
Ozone is formed in the troposphere by various chemical reactions involving a combination of the oxides of nitrogen, reactive volatile organic compounds (VOC) produced by a combination of exhaust from automobiles in the form of unburned hydrocarbons, and diatomic oxygen in the presence of sunlight (Figure 12).zone is formed in the troposphere by various chemical reactions involving a combination of the oxides of nitrogen, reactive volatile organic compounds (VOC) produced by a combination of exhaust from automobiles in the form of unburned hydrocarbons, and diatomic oxygen in the presence of sunlight (Figure 12).