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Why petri dishes should be placed upside down in the incubator?


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#1 hygienic

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Posted 19 February 2011 - 02:06 PM

Hi every one :

debate;

Technically and practically , in Food Microbiological testing , especially samples incubation step , the petri dishes should be placed inside the incubator in upside dowen , so do you know , why it shoul incubate in this situation , not normal ? what is the advantage if it is upside dowen ?


Thanks & Regards
Hygienic


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#2 Hongyun

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Posted 19 February 2011 - 03:30 PM

Hi every one :

debate;

Technically and practically , in Food Microbiological testing , especially samples incubation step , the petri dishes should be placed inside the incubator in upside dowen , so do you know , why it shoul incubate in this situation , not normal ? what is the advantage if it is upside dowen ?


Thanks & Regards
Hygienic




If I remembered my texts correctly, I think it is to prevent the condensation from dripping onto the medium and contaminating it.
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#3 DAVE84

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Posted 19 February 2011 - 10:02 PM

Yes hongyun.
You are totally correct. That is the one and only reason for keeping petri plates inverted.



Dave


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#4 raffay

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Posted 20 February 2011 - 03:49 AM

i agreed with dave that petri plates are placed upside down in ordor to avoid the absorption of moisture (resulted due to condensation) if it is not done colonies may not be distinct and clear.
regard
raffay

Yes hongyun.
You are totally correct. That is the one and only reason for keeping petri plates inverted.



Dave


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