Matrix. Calcifications or mineralization within a bone lesion may be an important clue in the differential diagnosis. There are two kinds of mineralization: a chondroid matrix in cartilaginous tumors like enchondromas and chondrosarcomsa and an osteoid matrix in osseus tumors like osteoid osteomas and osteosarcomas.
Oil refinery jobs will have one set of required qualifications, while other jobs may have different qualification requirements. You will need to complete a high school education in order to become a refinery operator in most cases. Once you finish high school, it is a wise decision to enroll in an associate's degree program that will train you for work as a refinery operator.
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.