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Group 11 metals, dithiocarbamate copper

Once the fungicides penetrate to the cell membrane or into the cytoplasm they may operate by devious means to disrupt vital functions. There is substantial evidence that the quinones immobilize the sultliydryl and imino prosthetic group of enzymes. The 8-hydroxyquinoline and dithiocarbamate compounds are active against copper and other metallic members of an enzyme system, presumably hy their ability to chelate metals. Heavy metals such as mercury alTect certain enzymes such as amylases and may serve as general protein precipitants. [Pg.693]

Polar functional groups of the additives are adsorbed on metal surfaces and this provides a barrier to prevent corrosive materials from contacting the metallic surfaces. Zinc dithiophosphates, dithiocarbamates and benzotriazoles are commonly used to protect copper-lead bearings from the type of corrosion present at concentrations of 50 to 300 mg/kg of oil. Rust inhibitors derived from sulfonates and amines also form absorbed films on ferrous metal, which prevents corrosive material from reaching the metal surface. [Pg.25]

The traditional copper fungicides are in fact inorganic copper coordination compounds The still most important group of organic protectant fungicides, the dithiocarbamates, are applied in the form of their metal-coordination compounds. Dimethyldithiocarbamate as the iron complex ferbam and the zinc complex ziram, ethylenebisthiocarbamate as the zinc complex zineb and the manganese complex maneb. [Pg.123]

The study of the inhibitors of enz3rmes has also contributed to our understanding of how enzymes act. Certain enzyme poisons such as carbon monoxide, cyanide and diethyl dithiocarbamate have been shown to inactivate enz)rmes by virtue of their high affinity for metals. Thus the inhibition of cytochrome oxidase by CO and CN is because these combine with the iron of the haem prosthetic group. Similarly, it is the affinity of dithiocarbamate for copper which makes... [Pg.73]


See other pages where Group 11 metals, dithiocarbamate copper is mentioned: [Pg.362]    [Pg.404]    [Pg.415]    [Pg.122]    [Pg.123]    [Pg.239]    [Pg.31]    [Pg.482]    [Pg.122]    [Pg.109]    [Pg.378]    [Pg.152]   
See also in sourсe #XX -- [ Pg.383 , Pg.412 ]




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