Bacterial smells, odorants

EDIT: This article proves to be very popular, I will append it in the future.

  1. streptococcus milleri — browned butter
  2. pseudomonas aeruginosa — flowery, sickly sweet, “concord grapes”, naphtalene-like, grape candy
  3. clostridium difficile — horse excrement, heinous smell
  4. proteus sp. — sweet, corn tortilla smell, ‘masculine notes’
  5. actinomyces sp. — wet earth smell after rain
  6. flavobacterium odoratum, alcaligenes faecalis — ‘fruity’
  7. alcaligenes odorans — ‘fresh cut apple’
  8. streptomyces — ‘dirt cellar’
  9. cyanobacteria, actinomyces — geosmin, ‘potting soil’
  10. source
  11. streptococcus pneumoniae — methyl methacrylate up to 1420 ppb! (Methyl methacrylate, that is what is used to manufacture acrylic plexiglass, also used in dentistry, you absolutely should know this chemical! Basically, if you smell this on the lung breath (among other things), act fast, direct your ‘hits’.)
  12. staph sp., corynebacterium sp. and 100 others — sulphur odours
  13. choline metabolism –> trimethylamine
  14. dimethyl disulfide, sludge –> lactobacillus, corynebacterium, pseudomonas acidovorans, pseudomonas alcaligenes, preudomonas pseudoalcaligenes, pseudomonas testosteroni, Alcaligenes denitrificans subsp. xylosoxydans, Alcaligenes denitrificans subsp. denitrificans, Alcaligenes faecalis, Alcaligenes odorans, Achromobacter group Vd, source
  15. dimethyl sulfide, nature –> Pseudomonas spp., Streptomyces, Bacterium spp., Aspergillus spp., Clostridium sporogenes, Alteromonas putrefaciens, Pseudomonas fluorescens, Achromobacter spp., Pseudomonas putida, Proteus spp., Pseudomonas fluorescens, Proteus vulgaris, Serratia marcescens, source

“Anaerobes are particularly pungent due to their reliance on sulfhydryl compounds to maintain redox balance.”

grape, sweet aroma: 2-Aminoacetophenone

NOTE HERE: notice that sickly sweet-ish aromas may be also products of not only purely bacterial “fermentation” (in the generic sense of the word), but also a combination of human pheromones, scent glands (oiling glands on specific body locations), the mentioned microbially processed aforementioned excretions, or these may be even pure, unaltered scents. (Remember how sweetly baby heads smell? Those are hormones/pheromones and fatty acids in action, the smell itself can alter human emotions/actions, so we can argue humans do have a pheromone/scent gland system, even if it is marginal.)

16. butyric acid and butyrates… you know this smell all too well. Easily located in dental plaques, it is many times the product of fusobacterium nucleatum, you better learn to recognize this smell quickly, it is very unique smell, even if not unique to this bacteria. The butyric acid is an irritant and among other bacterial products helps to damage cell walls (bleeding, shriveled gums, anyone?). Fusobacterium nucleatum is a “bridge” bacteria, it provides the biofilm framework on which plethora of others, even pretty dangerous ones will operate. Don’t bother throwing antibiotics at it, this bacteria works differently; as it consumes proteins for all its energy needs, protease inhibitors will lead to cell death. I heard that Bestatin might be very efficient. As this bacteria is not motile, very conscientious physical clean-up of plaques, followed by surface sterilisation (like very weak solution of AgNO3), may trigger rapid wound healing, as this bacteria stops *forgot the name of the progenitor cells that facilitate healing” from working. Also some tumors need this bacteria to operate, so eradicating in on the spot may make the tumour to die away on its own. Link: Bacteria and tumours: causative agents or opportunistic inhabitants?

17: propionic acid: I do not have separate info right now, so assume the above is valid as well, when these acids are present in significant quantities, assume that bacteria able to permanently colonize mouth is present.

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