Illustration of ω and Δ annotation for the chemical structure of i -C 17:1 ω7 / 15-Me-C 16:1 Δ 9 .

The a ( i ) -notation for methyl branching describes the total number of C, while the Me-notation describes the number of C in the backbone. For sponge LCFAs, a mixture of both nomenclatures is, however, commonly used.

Bibliographic Details
Main Authors:	Anna de Kluijver (9997862), Klaas G. J. Nierop (10042102), Teresa M. Morganti (10042105), Martijn C. Bart (9997865), Beate M. Slaby (10042108), Ulrike Hanz (4710162), Jasper M. de Goeij (7891805), Furu Mienis (4710161), Jack J. Middelburg (119295)
Format:	Still Image
Language:	unknown
Published:	2021
Subjects:	Biochemistry Microbiology Ecology Inorganic Chemistry Environmental Sciences not elsewhere classified Biological Sciences not elsewhere classified FA profiles HMA precursor Arctic sponge grounds MBFA LCFA study endosymbiont-host interactions Arctic
Online Access:	https://doi.org/10.1371/journal.pone.0241095.g001

Description
Summary:	The a ( i ) -notation for methyl branching describes the total number of C, while the Me-notation describes the number of C in the backbone. For sponge LCFAs, a mixture of both nomenclatures is, however, commonly used.