Tampons shouldn't be worn overnight because... 1  Tampons need to be changed every 4-6 hours and many people sleep longer than this - changing often is important as tampons allow bacterial growth while preventing vaginal cleaning so the longer a tampon is worn the more bacteria can multiply within the vagina.
MacConkey agar is a selective medium containing bile salts and crystal violet that inhibits the growth of Gram-positive bacteria while allowing for the growth of Gram-negative bacteria.MacConkey agar is often used when investigating and culturing fecal bacteria.he MacConkey agar we talked about as an example of a selective media is also a differential media. In addition to the selective bile salts and crystal violet, MacConkey agar contains a pH indicator and the sugar lactose.
Culture Media â 1. CULTURE MEDIA AND CULTIVATION OF BACTERIA. The study of microorganisms requires techniques for isolating cells from natural sources and. growing them in the laboratory on synthetic media. Thus, development of synthetic culture media. and culture techniques have played important roles in the advancement of this field. Microbiologists.