pasteurs exp with cheese slices

louie · Post by **louie** » 24 Nov 2006, 10:24

Hi Everyone ! I'm going through my bio book looking at what did and didn't work this year. If anyine knows the prac I'm refering to it's 7.4 pasteurs classic experiment in Heineman Biology Activity Manual. Well nothing much grew on any of the pieces of cheese. Any ideas or better alternatives would be appreciated

Sue

Post by **Ocker** » 24 Nov 2006, 11:00

Hey Sue
For this I make2 conical flasks / group
1 with air trap delivery tube & 1 with Straight vent tube
half fill both with chicken broth fron supermarket sit both on hotplate and boil, within a week the vented one grows fur, while the air trap remains free of bacteria

Ocean Breeze · Post by **Ocean Breeze** » 24 Nov 2006, 12:20

Hi Sue..

I set up the same apparatus as Graeme. I buy a chicken neck from supermarket, and boil up a broth brew. Has worked well for us.

louie · Post by **louie** » 24 Nov 2006, 12:37

Thanks Guys will do

louie · Post by **louie** » 24 Nov 2006, 12:57

How many bends do I need to make an air trap delivery tube

2 ?

Ocean Breeze · Post by **Ocean Breeze** » 24 Nov 2006, 13:20

Yes, 2 bends. You can buy then cheaply from brewing supplies.. couple of dollars.

louie · Post by **louie** » 27 Nov 2006, 09:29

Clever thinking Rainbow sky ...thanks

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pasteurs exp with cheese slices

pasteurs exp with cheese slices

cheese slice exp