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They found that several bacterial species in the Massilia and Arthrobacter genera, and some fungi in the Penicillium and Fusicladium genera, were more abundant after a wildfire than before—especially at sites that burnt with greater intensity.

They found that several bacterial species in the Massilia and Arthrobacter genera, and some fungi in the Penicillium and Fusicladium genera, were more abundant after a wildfire than before — especially at sites that burnt with greater intensity.

With Biochemist David Gutnick, Rosenberg isolated a genus of bacteria called arthrobacter, which feast on crude oil, and then developed a particularly fast-multiplying new strain, which they named "RAG-1."