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.
A point source is a single, identifiable source of pollution (Wikipedia), such as a pipe or a drain. Industrial wastes are commonly discharged to rivers and the sea in this way.onpoint sources. Non-point sources of pollution are often termed âdiffuseâ pollution and refer to those inputs and impacts which occur over a wide area and are not easily attributed to a single source.