Abstract
Rats were administered 24 mg/kg of paraquat intraperitoneally. One, two, three, six and seven days after this injection, the rats were evaluated by several toxicologic, biochemical, and morphologic criteria. These included determinations of weight loss, visible lung hemorrhage, pulmonary edema, <i>in vitro</i> protein and collagen biosynthesis rates of lung tissue, and staining properties of lung sections. Morphologic evidence of mild edema was seen at day 1, while more severe edema was observed at days 2 through 7. Weight loss was apparent from day 1 throughout the experiment. <i>In vitro</i> protein biosynthesis rates by tissue were elevated above control values from day 3 onwards, while collagen biosynthesis rates were elevated from day 2 onwards. Increased staining with the Gomori reagent was observed from day 1, while increased staining with van Gieson's or Masson's trichrome appeared by day 2 or 3.
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