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[Changes in the rat liver after exposure to high doses of bromex].

Experiments were carried out with male albino rats treated with the phosphorous-organic compound--bromex. The pesticide was perorally administered to one of the experimental groups--a single dose of 1/2 LD50. The same quantity bromex was administered to the other experimental group after a previous 20-day treatment with the same preparation but with a dose of 1/20 LD50. The changes, not particularly well manifested, progressing the organelles of the liver cells were followed up. The changes were established (in mitochondria, endoplasmatic reticulum, lysozoymes and some other organelles) to be better manifested in the group under a single effect of bromex. In this case they are interpreted as manifestation of one initial alterative process. In the group with the 20-day low doses, followed up by one high dose, the changes were gradual, lighter and considered a manifestation of a sort of adaptation or a form of subcellular liver regeneration.