Publications by authors named "Machi Kawano"
Article Synopsis
- The study examines the complexity of defining the "moribund state" in fish for acute toxicity testing, emphasizing the need to link observable signs to imminent death.
- Researchers assessed 13 clinical signs in Japanese medaka fish exposed to various toxicants and found that immobility, lethargy, and surface immobility reliably indicated the moribund state.
- The findings included survival times for each sign, aiding in decisions about euthanasia to minimize suffering in laboratory settings.
Toxic evaluations of sediments in Tokyo Bay, Japan, using Japanese medaka embryos.
Environ Sci Pollut Res Int
December 2017
Toxic risks of sediments collected from seven sites in Tokyo Bay were evaluated using Japanese medaka embryos. Those sediments with slight pore water were placed in grass petri dishes without overlying water. The most remarkable effect in the field sediment was to cause hatching delay in embryos, and the longest time until hatching took was 12.
View Article and Find Full Text PDFEffects of oxygenated polycyclic aromatic hydrocarbons on the early life stages of Japanese medaka.
Environ Sci Pollut Res Int
December 2017
Oxygenated polycyclic aromatic hydrocarbons (oxyPAHs) are directly discharged into the atmosphere with exhaust gas from diesel engine automobiles and industry and are also generated by photo-oxidation and/or microbial metabolism of parent polycyclic aromatic hydrocarbons (PAHs). They are widely distributed in environment, especially around urban areas. We evaluated the effects of exposure to oxyPAHs as acenaphthenequinone (ANQ), 7,12-benz(a)anthracenequinone (BAQ), 1,4-naphthoquinone (NAQ), and 9,10-phenanethrenequinone (PHQ) in Japanese medaka (Oryzias latipes) embryos.
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