Talk:Paraquat

From Wikipedia, the free encyclopedia

You have new messages (last change).
  • paraquat is it illegal? 12:28, 29 October 2005 82.38.113.127
  • In the United States, paraquat is classified as a Restricted Use Pesticide, which means that only appropriately licensed individuals are allowed to purchase or apply it -- but it's not what you'd call illegal. ---Belgrano 07:03, 15 December 2005 (UTC)
  • Removed a section that seemed to be from a company selling Paraquat. Added a linke to the CDC's information sheet about paraquat insted. Problems? 23:45, 3 January 2006 131.230.28.41
  • I'd like to bring attention to the "Caracteristics" section of this article which appears quite biased to my eye. this sounds like the type of thing you'd expect from a brochure meant to promote the product. I'm not implying that any of the information is false, just that the tone might be misleading. Can anyone more knowlegeable than I please rework this section ? 65.93.193.205

Contents

[edit] Paraquat pot?

As paraquat is very quick acting, rapidly destroying the green tissues of plants exposed to it, it would seem unlikely that much of a crop sprayed with the chemical would ever have been used. Booshank 16:10, 18 October 2006 (UTC)

The tissues are destroyed in the sense of being killed, but they remain otherwise intact. Assuming the plant is mature enough that an adequate concentration of pyschoactive compounds has formed, it could still be harvested and used.
--Belgrano 14:37, 27 February 2007 (UTC)

[edit] Operation Paraquat

[edit] Diquat redirection

  • Sorry if this is not the correct talk-page to post this on but I just searched for diquat and got redirected here. I find that a bit bothersome since they are two completely different molecules and even though they have approximately the same mechanisms (inducing oxidative stress) diquat is primarily nephrotioxic while paraquat does a lot of its damage to the lungs... Winterbay 13:53, 16 November 2006 (UTC)

[edit] mode of action?

i have read that paraquat only reacts on the green parts of plants and not roots and woody stems. the article mentions a superoxide radical that can attack unsaturated membrane lipids.

  • are there only saturated membrane lipids in roots and stems?
  • is there any other reason for this specificity?
  • what happens when the unsaturated lipids are "attacked" by the superoxide radical?
I can't say anything about the first two questions (sicne I'm not a biologist of any kind) but the last one I can. What you get is this reaction scheme:
Radical + LH (Lipid) -> L*, L-radical + O2 -> LOO*, LOO* + LH -> LOOH + L* (a new one that can continue the radical cycle...)
The * indicates a radical. This leads to the distruction of the cell membrane integrity and cell death (usually by necrosis). |Winterbay 20:00, 20 november 2006 (CET)
Roots and stems are susceptible to damage by oxygen radicals, but the radicals and other secondary compounds produced by paraquat destroy vascular tissue so rapidly that those compounds have little chance to translocate out of the foliage.
--Belgrano 15:56, 7 February 2007 (UTC)

[edit] mode of action?

please, TELL US MORE ABOUT THE MODE OF ACTION!! there are several articles about this, i guess the biochemistry of the mode of action it is at least as important as the "wonderful story of paraquat pot" !!!!!!!!!!

Retrieved from "http://en.wikipedia.org../../../p/a/r/Talk%7EParaquat_2cfd.html"