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.
One year after the fire and explosion on the BP Deepwater Horizon rig in the Gulf of Mexico, we round up the main points so far. BP's Deepwater Horizon oil well explosion last year killed 11 workers and caused the biggest offshore spill in US history. Photograph: Reuters.