Through consortia, synthetic biologists have been able to design an enhanced efficiency in bacteria that can excrete bio-surfactants as well as degrade hydrocarbons for the interests of cleaning oil contamination in Assam, India.[8] Their experiment took combinations of five native naturally occurring hydrocarbon-degrading bacteria, and analyzed the different cocktails to see which degraded poly-aromatic hydrocarbons the best.[8] The combination of Bacillus pumilis KS2 and Bacillus cereus R2 was found to be the most effective, degrading 84.15% of the TPH after 5 weeks.[8]