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Bacteria Manage Perfume Oil Production From Grass
ScienceDaily (Nov. 7, 2008) — Scientists in Italy have found bacteria in the root of a tropical grass whose oils have been used in the cosmetic and perfumery industries.
These bacteria seem to promote the production of essential oils, but also they change the molecular structure of the oil, giving it different flavours and properties: termicidal, insecticidal, antimicrobial and antioxidant.
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Bacteria Manage Perfume Oil Production From Grass

There is a lot of interest in Vetiver because it has such a dense root system.
It can therefore be used for stopping erosion or as a possible bio-fuel.