Bio aerosols Flashcards
Examples of bioaerosols
- Bacteria
- Viruses
- Pollen
- Mold/fungal spores
- Cell fragments
- Toxins/Mycotoxins
- Algae
Where do bioaerosols come from?
Natural: dry and wet emissions
Human: Agriculture, waste water treatment, waste treatment, animal farms, humans
Why is air a harsh environment for micro organisms?
UV light, - UV radiation, Drying and wetting (osmotic pressure), Freezing and thawing, Changing pH (due to water content), Low nutrition, Single or a couple of cells - no colonies
Protection of microorganisms in air?
- Spore formation
- Antifreeze proteins – or ice nucleation proteins
- Pigmentation for photo protection
bioaerosols ice formation
Bacterial membrane surface proteins are the most ice- nucleating active agents at high subzero temperatures.
Examples of airborne diseases
Tuberculusis, anthrax, Pneumonic Plaugue, wooping caugh, smallpox, measles, rubella…
Problems when sampling bioaerosols
May harm cell membrane. Long sampling time may cause some aerosols to dry out.
Common collection techniques
Collection on fibrous or gelatin filters or in impactor with algar or collection plate. Impinger, collection into liquid. Liquid cyclone, centrifugal collection into liquid.
