need help regarding this procedure experiment

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dummyperson
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need help regarding this procedure experiment

Post by dummyperson » Fri Feb 26, 2010 8:52 am

this is the procedure:
1. stone is inserted into 10L of plastic tank until 1/10 the tank
2. bacteria is then inserted into the tank
3. distill water that had been autoclave is inserted in the 10L plastic tank


the question is:
why step at 2 is done first before inserting the distilled water ?
what happen if the distill water is pour first before the bacteria?

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jwalin
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Post by jwalin » Fri Feb 26, 2010 3:55 pm

answer 1
had stone been put after the bacteria they could affect them adversely

answer 2
that depends on what your experriment is about
it isn't what you do that matters but it is how you do it

AndrewPhD
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Post by AndrewPhD » Fri Feb 26, 2010 6:25 pm

otherwise the bacteria could stay on top of the water because of surface tension and not have a chance to settle to the bottom with the stones.

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JackBean
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Post by JackBean » Fri Feb 26, 2010 6:49 pm

jwalin: you're totally out
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

dummyperson
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Post by dummyperson » Sat Feb 27, 2010 3:38 am

it is 100% that the bacteria do not settle to the bottom?

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