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Culture Microscope

December 28th, 2009 Leave a comment Go to comments

Culture Microscope
do you need a microscope to see bacteria in a petri dish??

are bacteria visible if they are cultured in a petri dish??
im just trying to prove that anti bacterial soaps wont kill all fo the bacteria. so i only need see if they do or do not exist
im just trying to prove that anti bacterial soaps wont kill all fo the bacteria. so i only need see if they do or do not exist

If you mean an individual bacterium, then yes you need a microscope in order to see that. Bacteria sizes range from .5 to 5 micrometers, which is impossible for the naked eye to see. However, bacteria in a petri dish will most likely form colonies, which are basically groups of a whole bunch of bacterium smooshed together in a circular shape that you can see with the naked eye. If your culture is new, you can count the number of colonies to get and idea of how many individual bacterium there are in your sample. If you let the bacteria grow, however, the colonies will eventually collide into one another until you get a bacterial lawn, where enough colonies combine to cover the whole plate. Sometimes the bacteria dies before that happens though.

The type of growth agent you use will also affect whether you see bacteria. Some mediums are general use, like nutrient agar, so you can grow a number of bacteria with them. Others are more species specific, such as tomato juice mediums.

Cancer cells in 3D cell culture (breast adenocarcinoma)


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