Re: A level Investigation - help required please!
>I am a sixth form student studying A level Biology. As part of the course,
>students are required to do a Longer Investigation.
>My proposed title for this investigation is:
>THE EFFECT OF TOOTHPASTE ON MICROBES.
>I have thought about which species of bacteria to use, and have in the end
>decided to use two different species, Rhizopus stolonifer, and
>Penicillium. I would greatly appreciate any help, for example, suggestions
>of suitable methods, reading material, etc.
Neither Rhizopus (a bread mold) nor Penicillium (another bread mold) is a
bacterium. Molds require different culture conditions that bacteria, and you
cannot investigate toothpaste's effects on bacteria by experimenting with
Why not culture some of whatever is growing in your mouth and test toothpaste
on that? That might be more relevant to your study.