Influence of Zeazine herbicide on different tissues during acute, subacute, and chronic stages was examined, when sublethal doses not exceeding the quantity usually used were applied. Structural changes of lung tissue, specially in short and medium interval resulted, comprising circulatory, and partially regressive changes on alveolocapillary membrane level with special tendency to multiplication of collagenous tissue in the long-term stage, without any tendency to chronical lesion and change of the function.
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