Definition of Water Activity Water activity (aw) refers to “free” water available for microbial growth. For microbial growth to occur, moisture must be freely available. The water activity of a material determines which types of mold would grow on that material. Technically, the water activity is defined as the ratio of the vapour pressure exerted […]
Wallemia Mold
Wallemia spp. The genus Wallemia is xerophilic. Three species of Wallemia have been identified. These are W. ichthyophaga, W. sebi, and W. muriae. Wallemia sebi is the most well known species. It has been isolated from air, soil, dried food (causing spoilage) and salt. Since the species within the genus Wallemia have been recognized only […]