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Discovery of off-axis jet structure of TeV blazar Mrk 501 with mm-VLBI
Koyama, S.,Kino, M.,Giroletti, M.,Doi, A.,Giovannini, G.,Orienti, M.,Hada, K.,Ros, E.,Niinuma, K.,Nagai, H.,Savolainen, T.,Krichbaum, T. P.,Pé,rez-Torres, M. Á,. Springer-Verlag 2016 Astronomy and astrophysics Vol.586 No.-
H. Matubara,K. Miharu,K. Kinoshita,K. Koyama,Yang Ye,K. Takahashi,I. Yoshimura,Y. Yamamoto,Y. Miura,Y. Kinoshita 한국생약학회 1998 Natural Product Sciences Vol.4 No.3
The analogues of lichen components showing anti-tyrosinase activities were synthesized. 4-Alkylresorcinol derivatives showed both the inhibitory activity and cytotoxicity in B-16 melanona cells at the doses of 10 mM to 1.2 mM. Resorcinol and 4-methylresorcinol showed the inhibitory effect with a low cytotoxicity at the doses of 2.5 mM and 600 μM among 4-alkylresorcinols, respectively. Some diphenylmethane derivatives (Type A, B, and C) had strong activities with a low cytotoxicity. While xanthene derivatives had no effect. Glucosides of 4,5-alkylresorcinol and the diphenylmethaney derivative (Type B) were prepared to decrease the cytotoxicity. As result, no effect were observed. Liposome of the diphenylmethane derivative (Type B) was prepared for the same purpose, and the later showed a remarkable effect at the dose at 1.5 μM with a low cytotoxicity.
Domain Wall Pinning by a Stray Field from NiFe on a Co/Ni Nanowire
R. Hiramatsu,T. Koyama,H. Hata,T. Ono,D. Chiba,S. Fukami,N. Ishiwata 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have investigated the influence of a stray field on a magnetic domain wall (DW). Thedepinning fields of a DW in a perpendicularly magnetized Co/Ni nanowire with partly-stackedNi81Fe19/SiO2 islands on it was measured. The depinning field for the wire with Ni81Fe19/SiO2was found to be higher than that for the wire without the stack, indicating that the stray field fromthe Ni81Fe19/SiO2 stack clearly served as an artificial pinning site for the DW. The magnetic forcemicroscopy observation evidenced that the DW was pinned near the Ni81Fe19 stack.