| CFU | colony forming unit |
| DIMS | direct-injection mass spectrometry |
| GC | gas chromatography |
| PCA | principal component analysis |
| PEEK | polyether ether ketone |
| PTR-MS | proton-transfer-reaction mass spectrometry |
| PTR-TOF-MS | proton-transfer-reaction time-of-flight mass spectrometry |
| SEM | scanning electron microscopy |
| VOC | volatile organic compound |
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