What pathogen (Staphylococcus epidermidis or E. coli) is able to grow on a MacConkey Agar plate and why? Is this type of agar serving as differential, selective, or both? Explain why. How long does a viral culture take? A laboratory culture of bacteria is transferred to two petr...
Define anaerobes. How can they be (theoretically) distinguished in FTM tubes and by using Brewer's agar plates? How does ampicillin biochemically act on bacteria? How do pathogenic fungi penetrate their host? Explain the mechanism. How does microbes develop r...
Using readily available materials (plus extras like powdered agar), readers can learn bacteria basics by taking samples from around the house and examining the growth in agar plates, inflating a balloon using yeast, and mummifying a fish with baking soda. Clear explanations of each experiment's ...
Skim milk agar plates are used to provide a nutritious medium for growing micro-organisms. Once prepared, the agar can be plated with a population of micro-organisms to test for the micro-organism's ability to digest casein protein. Casein is a large insoluble protein found in skim milk. As...
During which phase does growth occur at the fastest rate? Name two factors that limit microbial growth. Measurement of Bacterial Growth Estimating the number of bacterial cells in a sample, known as a bacterial count, is a common task performed by microbiologists. The number of bacteria in a ...
Agar is a type of nutrient used in a laboratory to grow cultures of bacteria, fungi, and other various microorganisms. Proper disposal of agar plates is a safety concern for the lab and the environment. Used plates have a different protocol than unused plates. The type of petri dish the ag...
Naturally occurring bacteria grow over 1–2 weeks to produce lactic acid, which then prevents the growth of food poisoning bacteria and other spoilage microorganisms. The amount of added salt controls the type and rate of the fermentation, and (ii) in sweet fermented pickles, they are preserved...
To determine if the Sc spores are transported by both swarming and swimming motilities, we repeated the experiments with a laboratory-cultivated Bs strain that is incapable of swarming, and spore transport does not occur on the agar swimming plates (0.27% agar) (Figs. 2A and S2) [20]. ...
There were two tubes used in this process: the tube that contained the primary culture and the tube that contained the nutrient agar where the unknown bacteria would grow. First, the inoculating loop was flamed. After removing the caps of both the test tubes, they were flamed to prevent cont...
Why did the mix of E.Coli 1 and E.Coli 2 grow on the S+A Petri dish when neither strain grew alone? How does Ampicillin function to prevent bacteria from growing? If it targets an enzyme, name it. Explain the process by which a single microscopic bacteriophag...