Please find this artical published in J. Neurosci 1986 Vol 16 pages 191-200.
Godde, J A fast voltage-controlled continous-flow miniaturechemostat.

Heres some info that might help you.. 
that would be volume #47 of the journal I believe.. 
note I believe this was printed in the "J. Neuroscience Methods" not
the "J. Neuroscience"

Found it.. 
           
Journal of Neuroscience Methods 
Copyright © 2004 Elsevier B.V. All rights reserved
Volume 16, Issue 3, Pages 175-249 (May 1986) 

A fast voltage-controlled continuous-flow miniature chemostat  ? ARTICLE
Pages 191-200 
Josef Gödde
Abstract | Abstract + References | PDF (526 K) 

You can purchase this at http://www.sciencedirect.com/

Here's the abstract

A fast voltage-controlled continuous-flow miniature chemostat 

Josef Gödde 

Institut für Zoologie, Universität Regensburg, Regensburg, F.R.G. 

Received 29 September 1985;  revised 12 February 1986;  accepted 18
February 1986. ; Available online 13 March 2003.




Abstract
A continuous-flow mixing device was developed for fast concentration
changes in a 0.25 t volume. The mixing chamber is designed to study
the effects of fast concentration changes in the bathing solution on
small probes (e.g. chemoreceptive hairs or membrane patches). It
consists of a freely accessible hanging droplet which is viewed with a
microscope. Mixtures are generated by injecting variable amounts of a
fluid into another fluid under photometric control. Time courses for
the concentration steps are (computer-)generated as voltage-time
courses which serve as set point of the injection-control servo
circuit. Positive steps of the concentration of the injected fluid can
be reached within less than 30 ms; falling concentrations are
determined by wash-out time constants around 100 ms.

Author Keywords: miniature chemostat; concentration; control;
continuous flow; ultrasound; photometry
 

Corresponding author. Correspondence: J. Gödde, Institut für Zoologie,
Universität Regensburg, Postfach 397, D-8400, , Regensburg, , F.R.G.

$30.00 bucks for the pdf file.. 
You should try a medical library at a local university or local
hospital if they will allow you access to the materials, if cost is a
concern. Call ahead to see if they carry the publication too.. it will
save you time.