In general, yeasts are grown in the laboratory on solid growth media or in liquid broths. Common media used for the cultivation of yeasts include potato dextrose agar or potato dextrose broth, Wallerstein Laboratories nutrient agar, yeast peptone dextrose agar, and yeast mould agar or broth.
Defining Perforating. Connecting to the reservoir. Perforatingâthe act of blasting holes through steel casing, cement, and formation rockâlasts only an instant, but the long-term viability of most oil and gas assets depends upon it.
Ear drum perforation â what is a perforated eardrum? 1  A hole or rupture in the eardrum, a thin membrane that separates the ear canal and the middle ear, is called a perforated eardrum. Middle ear infections may cause pain, hearing loss, and spontaneous rupture (tear) of the eardrum, resulting in a perforation. 2  In this circumstance, there may be infected or blood stained drainage from the ear. 3  In medical terms, this is called otitis media with perforation.