cheap probe to detect log growth

Peter C. Giardina, Ph.D. pgiardin at
Sat Dec 2 11:44:56 EST 2000

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 C. Giardina, Ph.D.
Univ. Iowa Dept. Microbiology
BSB 3-401, 51 Newton Rd.
Iowa City, IA   52242
voice: (319) 353-5654
FAX:   (319) 335-9006
<peter-giardina at>

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