Black-band disease on a stony coralWIKIMEDIA COMMONS, ANDY BRUCKNER, NOAA
Are air microbes alive?
Air contains a multitude of bacteria, up to 10,000 per cubic meter, which researchers have assumed exist in spore or dormant forms. To test this assumption, investigators from Rutgers University in New Brunswick, New Jersey, collected air from several locations from around the state and tried to increase the numbers of microbes using a spare liquid culture containing water and small amounts of salts, acids, and alcohols—conditions that mimic the compounds typically found in the air. The researchers then aerosolized successfully growing bacterial cultures using a reactor that they designed and built in-house, and recorded the amount of the carbon isotope 13 that was incorporated into the bacterial DNA -- a proxy for growth. Although the results showing some bacterial growth ...
