Ecological significance Plant volatiles

Serum proteins see Plasma proteins. Sesquiterpenes aliphatic, mono-, di- or tricyclic terpenes, formed from three isoprene units (C15H24). About 100 structural types are known, and about 1,000 natural representatives, forming the largest class of terpenes. Most are found in the volatile oils of plants. Little is known of the physiological significance of S. some compounds have an ecological role (Table). Smne are isolated for use in perfumery. 

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