Intestinal metaplasia is also a common in Barrett esophagus. It this condition it is the esophageal squamous epithelial cells that undergo metaplasia. Approximately, 60% of esophageal cancers diagnosed in the U.S. stem from focal intestinal metaplasia.
Ozone Emission Sources. Emissions contributing to ozone formation come from many areas. The main emission sources categories are: On-road - cars, trucks, and buses. Off-road - aircraft, locomotive,etc. Non-road - construction, agricultural equipment, etc. Point - cement and power plants.
Ozone is a gas that is naturally present in our atmosphere. Each ozone molecule contains three atoms of oxygen and is. denoted chemically as O 3. Ozone is found primarily in two regions of the atmosphere. About 10% of atmospheric ozone is in. the troposphere, the region closest to Earth (from the surface to about 10â16 kilometers (6â10 miles)). The remaining ozone.