DamonIRB wrote:
Bacillus thuringiensis (Bt) is an insecticide with unusual properties that make it useful for pest control in certain situations.
Bt is a insecticide/pesticide. Monsanto explains, in detail, how they take this soil born bacterium that is commonly used as a commercial pesticide and insert it into the DNA of a plant, confusing the plant, making it think the bacterium is supposed to be there. When a bug eats the plant, they die. Why? Because they have unwittingly ingested a pesticide that lives within the plant that causes their digestive system to shut down. Monsanto has done the same thing with their 'Roundup Ready Crops', but with a herbicide, Agrobacterium tumefaciens, which renders the plant immune to glyphosate, the main ingredient in Round Up weed killer.
Exactly where in there website is this? Can you please give the exact link, because I am not finding it. I have found where they describe using Bt to transfer in
the genes that are then
used by the plant cell
to produce the compound that is toxic to the insects, causing them to die when they consume the plant.
I found this:
http://www.monsanto.com/newsviews/Pages/glossary.aspx
Bacillus thuringiensis (Bt) - A naturally occurring bacterium present in soil and used successfully by home gardeners and organic farmers to control certain insects for more than 40 years. When ingested by a target insect, the protein produced by Bt destroys the insect by disturbing the digestive system. The Bt protein is harmless to other insects, people and animals.
Bt crops - Crops that are genetically engineered to carry a gene from the soil bacterium Bacillus thuringiensis (Bt). The bacterium produces proteins that are toxic to target pests but non-toxic to humans and other mammals. Crops containing the Bt gene are able to produce this toxin, thereby providing protection for the plant.
Insect-resistant crops - Plants with the ability to withstand, deter or repel insects and thereby prevent them from feeding on the plant. The traits (genes) determining resistance may be selected by plant breeders through cross-pollination with other varieties of this crop or through the introduction of novel genes such as Bt genes through genetic engineering.
Glyphosate tolerant (Roundup Ready) crops – A common herbicide-tolerant crop, which provide tolerance to glyphosate, an herbicide effective on many species of grasses, broadleaf weeds and sedges. Roundup Ready crops (cotton, corn, soybeans, and canola) contain the Roundup Ready gene, which allows glyphosate to be applied to the crop to provide effective weed control without damaging the crop itself.
Herbicide - A substance used to kill plants, especially weeds.
Genetically Modified Organisms (GMO) – Plants or animals that have had their genetic makeup altered to exhibit traits that are not naturally theirs. In general, genes are taken (copied) from one organism that shows a desired trait and transferred into the genetic code of another organism.
Gene - A specific segment of DNA in a chromosome that produces a specific product or has an assigned
And many more.
Science is a language all its own. Scientific terms mean very specific things, and are not freely interchangeable with other terms that are used within a general topic. Terms such as bacteria, genes, herbicide, pesticide, DNA, are NOT interchangeable. A "biopesticide" and a pesticide are not necessarily the same thing. If you know the science, know the terms, use them correctly, then what is said makes sense. Your last statement about "a herbicide, Agrobacterium tumefaciens, which renders the plant immune to glyphosate, the main ingredient in Round Up weed killer." demonstrates this exactly.
A. tumefaciens is a bacteria. An herbicide is a plant killer. So you are saying that Monsanto put a plant killer in their plants to make them immune to plant killer. Wrong. Monsanto used a bacterium to transfer the genes that give a plant immunity against a chemical plant killer found in their weed killer. That way, the weed killer (Round Up) can be applied to the crops, which are now resistant to the weed killer (do not die from it), so that the weeds die and the crop grows. How does the weed killer work? The chemical(s) in it interfere with the metabolism of the plant, so it cannot maintain its life. The original weed killers, the kind you use on your lawn to kill the dandelions but leave the grass alone, were designed on the naturally occuring situation that broadleaf plants (dicotyledonous plants) have a different metabolic pathway than grasses (monocotylendous plants). Killing weed grasses versus crop grasses like wheat and corn did not used to be possible, until someone found a way to change the metabolic pathways; this time it was man-made. Given a hundred or a thousand or ten thousand years, it might have occurred anyway. Science sped it up. And there are both good and potentially bad aspects to that. But why worry about killing the weeds anyway? Less weeds means better growing crops means more food from the field, means lower cost for that food, and more available. Which might not matter to you, but to many, and much of the world, that is a big concern. Hence, man messing with plants to try to make them better. Now using new and potentially scary methods, the unknown, the new frontiers, are always a bit scary.
Your descriptions are NOT spot on. Your use of the scientific language shows it is not a language you are fluent in. I was going to ignore this when I saw your first post, but you pushed it when there wasn't the obvious outcry you wanted or expected. There are reasons to be concerned about GMOs in some cases, but misinformation should not be the source.
Bacillus thuringiensis (or Bt) is a Gram-positive, soil-dwelling bacterium, commonly used as a biological pesticide; alternatively, the Cry toxin may be extracted and used as a pesticide. B. thuringiensis also occurs naturally in the gut of caterpillars of various types of moths and butterflies, as well on leaf surfaces, aquatic environments, animal feces, insect rich environments, flour mills and grain storage facilities.[1][2]
This is from Wikipedia, and the references are listed there as well. Follow the links for "biological pesticide" etc. You can learn a lot from going back to the basics.