
Geosmin is an organic compound with a distinct earthy flavor and aroma produced by a type of Actinobacteria, and is responsible for the earthy taste of beets and a contributor to the strong scent (petrichor) that occurs in the air when rain falls after a dry spell of weather or when soil is disturbed. In chemical terms, it is a bicyclic alcohol wi...
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http://en.wikipedia.org/wiki/Geosmin

A compound produced by many cyanobacteria and streptomycetes which cause the 'earthy' odour of soil.
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http://www.encyclo.co.uk/visitor-contributions.php
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