To solve the problems of aging of the body, it is necessary to trace how life span connected with the growth and differentiation of cells reproduction and genetic apparatus. To solve this problem, we have selected the rotifers Philodina roseola, which have endogenous aging and a very short lifespan. The distribution of DNA and RNA in organs of Philodina roseola rotifers taken from activated sludge and raw cultures was studied by histochemical methods. It has been shown that these microscopic animals contain DNA only in certain cellular and syncytial structures, while RNA is detected in the cytoplasm of most cells. The disappearance of nuclear chromatin with DNA in most organs during ontogenesis suggests that the lifespan of rotifers is limited by the lifespan of messenger RNA. In addition, the growth mechanism and the aging process in rotifers born from young and old individuals have been studied morphometrically. This study makes the rotifer Philodina roseola an irreplaceable object for gerontological research.
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