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Re: GE Debate v0.2



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."