Science Buddies: "Ask an Expert"

I was just wondering whether it was very important to keep the plates at a constant temperature. I ask this, because, as it is winter, it will be hard for me to keep the temperature extremely constant, as at night it can get quite cold. If the temperature varied from 10-25 degrees, what effect would that have on the bacteria?

Hi Benji,

Temperature has an effect on the growth rate of bacteria. The optimal temperature for growth varies for different types of bacteria. For example, bacteria that live in soil prefer cooler temperatures and can grow at 10-25C, those that live inside human guts prefer to grow at 37C, they will grow at 25C but much slower.
So it depends on what your project is as to whether this will be a problem. If you are measuring growth rates, then not being able to keep the temperature constant would be a problem. Perhaps you can find a lab with an incubator where you can grow your bacteria at a constant temperature.
If you tell us some more about your project we can help you figure out if variable temperature will be a problem.

good luck,
Caroline

benji wrote:I was just wondering whether it was very important to keep the plates at a constant temperature. I ask this, because, as it is winter, it will be hard for me to keep the temperature extremely constant, as at night it can get quite cold. If the temperature varied from 10-25 degrees, what effect would that have on the bacteria?

Do you know if there is a inexpensive heater you can buy to moderate the temperature without tainting the project?