cheap probe to detect log growth

Michael Witty mw132 at
Sat Dec 2 14:03:46 EST 2000

Dear Peter, I use E. coli only, so I could just dip the probe in dilute
ethanol before use.  Actually nothing more that washing up liquid might
be OK!  What do you do at the Department of Microbiology?

On Sat, 2 Dec 2000, Peter C. Giardina, Ph.D. wrote:

> On Sat, 2 Dec 2000, Michael Witty wrote:
> > Dear All, I am convinced there must be a better way of finding the log
> > phase of growth (for example of a conical flask of E. coli) than
> > repeatedly taking 1ml samples and putting them in a spec.
> > 
> >      My ambition is to have a cheap detector with a probe consisting of a
> > light source and photoresistor which can be dangled into my flask and
> > record data continuously.
> > 
> >      But I am a biologist not an electrical engineer.  Does anyone share
> > my ambition?  Or know how I can make this happen?  Mike.
> > 
> > 
> Hmmm... Not sure how you'd sterilize the thing by a convenient method
> without destroying it. And some folks have to shake their cultures pretty
> hard.  It would have to be one tough little device.
> Peter

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