Gram staining. Gram staining or Gram stain, also called Gram's method, is a method of staining used to differentiate bacterial species into two large groups (gram-positive and gram-negative). The name comes from the Danish bacteriologist Hans Christian Gram, who developed the technique.
Horizon Oil Sands. Horizon Oil Sands The Horizon Oil Sands project (or Horizon) is an oil sands mining and upgrading project. Horizon is 100% owned and operated by Canadian Natural Resources Limited.
Oil is burned off the surface of the water near the source of Deepwater Horizon oil spill in the Gulf of Mexico off the Louisiana coast, July 13, 2010. Oil is burned off the surface of the water near the source of Deepwater Horizon oil spill in the Gulf of Mexico off the Louisiana coast, July 13, 2010. REUTERS/Lee Celano. Tuesday, July 20, 2010.  Pelicans and other birds fly near a boom protecting against oil from the Deepwater Horizon spill off Racoon Island near Cocodrie, Louisiana July 15, 2010.