From: casi casi  <c_casi@y...>
Date: Wed Jan 24, 2001 10:08pm
Subject: Re: phenolic exudations

Hello World!

These exudates are usually considered to the various
phenolic compounds that oxidize to form brown material
in the medium. These substances tend to be inhibitory
to development. Treatments to minimize this problem
include pretreting the explants whith an antioxidant

         (citric or ascorbic acid)

including an adsorbent material in the medium
(polyvinilpyrrolidone or activated charcol)

You can use Gerlite instead of Agar.

It is not clear if Gerlite prevents the exudation or
the oxidation of that exudation.


Jorge Guzman