2023年8月10日 · The yellow color could also be a fungus which has contaminated your plate which happens often in a non-sterile classroom environment. Never open a petri dish after bacterial growth or fungal ...

2024年6月11日 · The bottoms of petri plates are labeled to avoid confusion or mix-ups when handling multiple plates. Since the plates are stacked with the bottom facing up, labeling the bottom ensures that the ...

2024年6月13日 · Agar can be kept in a petri dish in the refrigerator at 4 degrees Celsius for up to 7 days. If kept at room temperature there is a high chance of contamination occurring due to motile swarming ...

2024年6月17日 · A nutrient agar plate provides a larger surface area for bacterial growth and easier visualization of colony characteristics. In contrast, a nutrient agar slant is often used for long-term storage ...

2024年5月29日 · Incubating petri dishes upside down helps prevent condensation from accumulating on the agar surface, which can interfere with microbial growth and observation.

2023年9月14日 · This is to stop condensation from forming on the top of the lid. Condensation causes two problems (1) It will allow contamination to enter into the dish by moving accross the water film from the ...

2024年6月9日 · A liquid agar environment typically has more total bacteria compared to a petri dish. This is because liquid agar provides a larger surface area for bacteria to grow and reproduce, leading to ...

2024年6月13日 · To culture on plates, bacteria and bacteriophage are combined in melted agar and then poured into plates. The bacterial cells divide and evenly cover the surface of the plate forming a lawn.

2024年6月13日 · The ending agar is significantly diluted. If the undiluted agar is pured in sink, it will solidify and block up the sink.

2024年6月13日 · It may also affect the growth of the culture as the splashed media can mix with the top agar layer. To prevent inaccurate results and contamination, it is best to discard the petri plate.