Bioaerosol

A bioaerosol is a suspension of airborne particles that contain living organisms. These particles are very small and range in size from less than one micrometer to one hundred micrometers.

Fungus

A fungus is any member of a large group of eukaryotic organisms that includes microorganisms such as yeasts and moulds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, Fungi, which is separate from plants, animals, protists, and bacteria. One major difference is that fungal cells have cell walls that contain chitin, unlike the cell walls of plants and some protists, which contain cellulose, and unlike the cell walls of bacteria.

Macher

Am Ind Hyg Assoc J. 1989 Nov;50(11):561-8.
Positive-hole correction of multiple-jet impactors for collecting viable microorganisms.

Macher JM: Air and Industrial Hygiene Laboratory, California Department of Health Services, Berkeley 94704.

Multiple-jet impactors, typically with 200 or 400 holes, are used widely for collecting aerosols of living bacteria and fungi. In this type of impactor, the air jets impinge directly onto nutrient agar in a petri dish which is incubated after sampling until collected cells multiply into colonies. The observed number of colonies can be adjusted for the probability that more than one viable particle was collected through a sampling hole and merged with other microorganisms at an impaction site to produce a single colony.