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- W2013075277 abstract "Tetramethylurea (TMU, CAS No. 632-22-4) was tested for its inhalation toxicity in rats following repeated exposures. Male rats were exposed whole-body to TMU for 6 hours/day, 5 days/week for a total of 9 exposures over 2 weeks. Concentrations of 0 (control), 2, 20, and 100 ppm were studied. Four groups of 10 rats each were used to measure clinical signs and growth, clinical pathology (including hematology, biochemistries, and urine analysis), and tissue pathology. One-half of the rats were sacrificed 1 day following the 9th exposure; the other half underwent an 18-day recovery period prior to being sacrificed (recovery group). Body weight gains in rats exposed to 100 ppm were reduced as compared to the controls; no body weight effects were seen in either 2 or 20 ppm rats and no clinical signs of toxicity were observed in rats at any of the levels throughout the study. No compound-related clinical pathology changes were seen in any of the test groups and tissue pathology effects only occurred in the nasal tissue. In rats exposed to 100 ppm, microscopic observations of degeneration, necrosis, and ulceration of olfactory mucosa was seen. These lesions were still present but seen as recovering and healing after the 18-day recovery. Under the conditions of this test, the no-observed-adverse-effect level (NOAEL) was determined to be 20 ppm based upon both body weight changes and upper respiratory tract pathologic changes in 100 ppm rats." @default.
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- W2013075277 date "2001-01-01" @default.
- W2013075277 modified "2023-09-23" @default.
- W2013075277 title "INHALATION TOXICITY OF TETRAMETHYLUREA IN RATS" @default.
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- W2013075277 doi "https://doi.org/10.1081/dct-100106261" @default.
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