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Classification of the carotenoids and polyenes detected in the present study.
| Carotenoid/polyene group | I | II | III |
|---|---|---|---|
| C–C and C=C stretching frequencies in biofilm (cm−1) | 1154, 1510 | 1128, 1517 | 1157, 1520 |
| C–C and C=C stretching frequencies in isolated cells (cm−1) | 1154, 1510 | 1132, 1530 | 1157, 1520 |
| Estimated C=C double bond number N | 12 | 11 | 10 |
| Isolated microorganisms (labels used in Fig. 4A) | f | g | c, d, e |
