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weird bacteria

Scott J. Coutts scott.coutts at med.monash.edu.au
Tue Mar 4 05:33:57 EST 2003



Trond Erik Vee Aune wrote:
> 
> 
> Anne Thomas wrote:
> 
>>>> What about subculturing the swarmer onto a plate with a stronger agar
>>>> concentration? We used to use one (6% agar if I remember correctly)
>>>
>>>
>> which
>>
>>>> would stop the swarmers.
>>>
>>>
>>> Does this mean that swarming bacteria spreads through the agar and not
>>> on top of it?
>>>
>>> Trond Erik
>>>
>>
>>
>> No, Proteus mirabilis, for example, grows as a discrete colony onstead of
>> swarming.
> 
> 
> I don't get this. Why would increasing the agar concentration help 
> prevent swarming if they don't move through the agar?
> 

Because it decreases the availability of water at the surface of the 
agar. It's a 'dryer' surface for them to move across, so they move more 
slowly. Kind of like a slug trying to move across a wet surface versus a 
dry surface.


-- 
Scott J. Coutts
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