Publications by authors named "Misa Toda"
To clarify the characteristics of compounds with strong or weak nitrification inhibition in sewage, 64 organic compounds including compounds registered in Pollutant Release and Transfer Register (PRTR) were evaluated in terms of their chemical structures and molecular weights. Nineteen compounds showed strong nitrification inhibition by testing with Nitrosomonas europaea. Compounds with thioamide structures had the lowest median value of EC (0.
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- A study on the synthetic progestin levonorgestrel (LNG) in medaka fish revealed that exposure can lead to both masculinization and feminization of embryos, with the effects varying based on concentration levels.
- * At lower concentrations (0.1-10 μg/L), LNG significantly promoted masculinization, while higher doses (100 μg/L) led to a decrease in masculinization and exhibited feminizing effects.
- * The research found that LNG's action is linked to its estrogenic and androgenic properties, highlighting its potential to disrupt endocrine function and suggesting that medaka fish can serve as a suitable alternative model for studying these effects.
To clarify the basal aspects of sexual development in Javafish medaka, Oryzias javanicus (ZZ/ZW), a model marine species for ecotoxicity testing, we examined the details of gonadal sex differentiation and exogenous sex hormone-dependent sex reversals using genetic sex-linked DNA markers. Sex differences in germ cell numbers were observed at 5 days post hatching (dph), in which there was a significant increase in the germ cells of ZW. In ZW, diplotene oocytes and the ovarian cavity appeared at approximately 10, and 30 dph, respectively.
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