MadSci Network: Microbiology

Re: What does different kinds of bacterial growth look like?

Area: Microbiology
Posted By: Rolf Marteijn, Grad Student, dept of Foodscience -> Bioprocesengineering and dept. of Virology, Wageningen Agricultural University
Date: Mon Apr 28 20:52:25 1997
Area of science: Microbiology
ID: 855447810.Mi

Hi Amelia,

Bacteria and Fungi are probably the most fancy organisms around. At least they can be found in many different sizes, shapes and colors.

The pictures show some diffent bacteria. They were put together on these plates to illustrate the diversity. Bacterial colonies may be 'hairy', really round or even shining. I've done the experiment your describing and found many different bacteria, but you'll have to be a bit lucky. A good way is to 'dilute' the bacteria, so the slower growers won't be outgrown. To do so, make a single streak with the first tissue. Then take an metal spatula (but a small metal fork will do too) and hold it in a flame for a few seconds. Make a second streak with this fork, as shown in the next picture. (etc.)

There are many ways to study bacteria. The best you can do is use a microscope and study your bacteria. You'll see all different kind of shapes and sizes.

Hope this helps,

Regards, and goodluck,

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