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.
Microbiology. Microbiology is a fundamental biological science concerned with bacteria, viruses and other microbes. Some of the most important scientific discoveries have been made by microbiologists.Since 1910, approximately one-third of the Nobel Prizes in medicine and physiology have been awarded to microbiologists. career in microbiology offers many opportunities. The microbiology major is an excellent preparation for professional school (such as veterinary and human medicine) and graduate school, due to its emphasis on the pathogenesis of infectious disease, molecular biology, sterile techniques and laboratory skills.