DNA Repair Disorders. Four genetic disorders of the skin are caused by the inability of cells to remove damage caused by sunlight to DNA, the genetic material.our genetic disorders of the skin are caused by the inability of cells to remove damage caused by sunlight to DNA, the genetic material.
Excerpt from Petroleum Refining Industry Profile. Companies in this industry refine crude oil to produce fuel and other products. Major companies include Chevron, Exxon Mobil, and Valero (headquartered in the US); BP (UK); and Royal Dutch Shell (the Netherlands).Worldwide, the petroleum refining industry processes about 95 million barrels of crude oil each day, including about 18 million barrels per day refined in the US.The countries with the largest refining capacity are the US, China, Russia, India, Japan, and South Korea.ajor companies include Chevron, Exxon Mobil, and Valero (headquartered in the US); BP (UK); and Royal Dutch Shell (the Netherlands). Worldwide, the petroleum refining industry processes about 95 million barrels of crude oil each day, including about 18 million barrels per day refined in the US.
This is a list of selected petroleum (crude oil) exploration and production companies (petroleum industry) in alphabetical order. This list does not include companies involved in refining and marketing only.