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Molybdenum dioxide (MoO2)/carbon nanofiber composites were successfully fabricated by LiCl–KCl flux cooling. The preparation was obtained by heating mixtures of MoO3, LiCl, KCl, and carbon nanofibers at 500 °C for 10 h and then carrying out quenching in a furnace with the electric power turned off. The obtained MoO2/nanocarbon composites were blackish and had a metallic luster. The obtained composites have lengths of about 5–150 µm and are in the form of prism. The carbon nanofibers and MoO2 crystals were interfused densely with each other. Carbon nanofibers were found to act as a reducing agent.

To investigate histamine formation in Japanese marine fish, model samples were made from fish meat mixed with intestines of commercial 73 fish species. After the samples were stored at 25℃ for 12 hr, histamine was detected in 35 fish species at 50 mg/kg or more. These fish species might potentially be related to histamine poisoning. In addition, the effect of frozen storage at -45℃ on histamine formation was examined. Although histamine was formed in some fish species, and Photobacterium damselae and Photobacterium iliopiscarium were isolated from the frozen samples, the amount of histamine formed in the model samples was reduced in all tested fish species after frozen storage. Therefore frozen storage of fish may be effective to control histamine formation, even though histamine forming bacteria survived under these conditions.