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23.Trans.Infl.Tox.11

23.Trans.Infl.Tox.11 - Special Topic How Transformations...

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Special Topic: How Transformations Influence Toxicity Introduction Some Processes in Vascular Plants Some Processes in Vertebrates Summary and Conclusions
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I. Introduction Reactions often directly detoxify a chemical. Reactions almost always increase water solubility of a chemical. However, chemicals may be instead activated. Differences in toxicity are often traced to differences in biodegradation.
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II. Some Processes in Vascular Plants Monuron, a substituted urea class herbicide, is used in cotton fields and on other crops. Cotton is selectively resistant via P450- catalyzed N -demethylation (oxidation).
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Some Processes in Vascular Plants Propanil, an acetanilide herbicide, is commonly used for weed control on many crops, including rice, potatoes and wheat. Most crops are selectively resistant via amidase-catalyzed hydrolysis. The weeds are often not!
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Some Processes in Vascular Plants Atrazine, a triazine herbicide, is commonly used in for weed control in corn fields. Corn is selectively resistant via GST-catalyzed glutathione conjugation (Cl is the leaving group).
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