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WHOI chemist Ben Van Mooy holds a sample of water taken from the plume of hydrocarbons more than 1,000 meters below the surface of the Gulf of Mexico. He has prepared the sample for the Winkler titration, a method that determines the concentration of oxygen dissolved in the water. Van Mooy's work in the Gulf showed that oxygen levels in and around the plume were not significantly lowered by microbial activity. (Photo by Dana Yoerger, Woods Hole Oceanographic Institution)