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.
1 Ozone is a naturally occurring gas found in the troposphere and other parts of the atmosphere. 2  Tropospheric ozone is often called bad ozone because it can damage living tissue and break down certain materials. Tropospheric ozone is often called bad ozone because it can damage living tissue and break down certain materials. 2  Concentrations of ozone are not uniform in the troposphere. 3  Longer exposure to ozone will increase the negative effects.