***PLEASE HELP-milk microbiology project
alpha01 at execpc.com
Wed Mar 26 08:53:09 EST 1997
My daughter did a similar study for her 8th grade science fair
project. What she found out was that bacterial counts when ballistic
when milk was left out at room temperature for two night. The
experiment was set up to leave a tube of milk out on the kitchen
counter overnight and then to return it to the refrigerator each
morning. There was a dramatic difference between one and two night
out on at room temperature.
She also tested unpasturized vs pasturized milk. As expected the
pasturized sample contained very few bacterial coloines when properly
stored, while the unpasturized has 20-50,000 colonies per ml. By
comparison, the sample left out two night were to numerous to count
by our test, but we estimated many millions of colonies per ml.
I hope this info is helpful.
In article <19970325160000.LAA19845 at ladder01.news.aol.com>,
paulparty at aol.com says...
>I am doing a project entitled:
>'Investigating how different milk types (skimmed/whole and
>UHT/Pasteurized) and days milk is left at room temperature unexposed,
>affects the bacterial content'
>I am measuring bacterial content by counting colonies on incubated
>agar plates and also carrying out titrations against sodium hydroxide
>order to measure lactic acid content.
>I would be very grateful if anyone could provide any relevant
>information about milk microbiology information and what results I
>expect from each of the different milk types and why.
>Thanks very much.
More information about the Microbio