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Hideki Hayakawa,Quang Dung Le,Masato Kinoshita,Yusuke Takehana,Kei Sakuma,Hirohiko Takeshima,Shigeaki Kojima,Kiyoshi Naruse,Koji Inoue 한국해양과학기술원 2015 Ocean science journal Vol.50 No.2
Ricefishes of the genus Oryzias, including Japanese medaka (O. latipes), are known as excellent model organisms for studies in various fields of science. Some species of the genus inhabit brackish water, and such species are recognized to be useful to investigate physiological phenomena in seawater. However, only a limited number of species have been recorded from brackish waters. In addition, there is no information about the genetic relationship among populations inhabiting sites with different salinities. Here we report the discovery of Oryzias fish in two locations near Haiphong, northern Vietnam, a brackish mangrove planting area and a freshwater pond. A phylogenetic analysis using mitochondrial 12S and 16S ribosomal RNA (rRNA) gene sequences indicated that the fish from the two localities are the same species, Hainan medaka,O. curvinotus. Population genetic analysis using the mitochondrial 12S and 16S rRNA gene sequences revealed a close genetic relationship between the two populations. These results suggest that O. curvinotus is adaptable to both hyperosmotic and hypoosmotic environments. Due to its osmotic adaptability and ease of rearing in the laboratory, this species is expected to become a model for marine environmental and toxicological studies, as well as for studies of osmotic adaptation mechanisms.
KenichiKakimoto,Lien Thi-Kim Nguyen,Yusuke Hayakawa,Yuya Shinkai,Isao Kagomiya 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
Preparation of alkali niobate ceramic powder of KNbO_3, (Na,K)NbO_3, and (Li,Na,K)NbO_3 has been carried out by using a citrate-based liquid precursor route which was a newly developed innovative wet powder processing technique. The derived powder showed a well-sinterable property and the sintered ceramics demonstrated excellent ferroelectric property. Orthorhombic KNbO_3 showed a remanent polarization (P_r) of 23.3 μC/cm^2 and coercive field (E_c) of 7.8 kV/cm, and (Na,K)NbO_3 showed a P_r of 31.4 μC/cm^2 and E_c of 17.3 kV/cm. On the other hand, tetragonal (Li,Na,K)NbO_3 demonstrated Pr of 19.0 μC/cm^2 and Ec of 13.6 kV/cm. The citrate liquid precursor route demonstrated a good potential for the synthesis of fine powders for lead-free alkaline niobate ceramics.