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Re: GE Debate v0.2
- To: h.j.deelstra@bioledu.rug.nl
- Subject: Re: GE Debate v0.2
- From: Roberto Verzola <rverzola@phil.gn.apc.org>
- Date: 30 Nov 99 10:01:29
- Resent-From: gentech@gen.free.de
Heine,
As far as I know, Stotzky was referring to the natural Bt toxin.
The valid question can be raised: how do we know the persistence
is also true for the corn-synthesized toxin? We don't. More research
is needed. -- Roberto Verzola
>> > 2.2.4. BT IN THE SOIL
>>
>> > - "Bound humic acid-toxin complexes were toxic to larvae of
>> > the tobacco hornwork (Manduca sexta). The lethal concentration
......
>> > soil. Soil Biol. Biochem. 30: 463-470). See also: J. Koskella and
>> > G. Stotzky, "Microbial Utilization of Free and Clay-Bound
>> > Insecticidal Activity after Incubation with Microbes," Applied
>> > and Env. Microbiology, Sep 1997: 3561-3568. See further: H. Tapp
>> > and G. Stotzky, "Persistence of the Insecticidal Toxin from Bt
>> > subsp. Kurstaki in Soil," Soil Biology and Biochemistry, Vol 30
>> > No 4 1998: 471-476.)
>>
>> Could you elaborate on this; modified toxin or also native toxin?
>> Same for below:
>>
>> > -- Studies Note Risks of Genetically Modified Plants: Dr.
>> > Guenther Stotzky, soil microbiologist at New York University, has
>> > found that Bt toxin in the soil, as it might be found after a
>> > crop is plowed under, can remain active for at least eight
>> > months. "We were surprised," Dr. Stotzky said. "I'm sure it hangs
>> > around longer. We just terminated the experiment after eight
>> > months."