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Magnetic Memory in a Ceramic YBCO Superconductor Composed of Sub-micron-size Grains
Hiroyuki Deguchi,Takuya Ashida,Mitsuhiro Syudo,Masaki Mito,Seishi Takagi,Makoto Hagiwara,Kuniyuki Koyama 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The ceramic YBa2Cu4O8 (YBCO) composed of sub-micron-size grains is considered as a randomJosephson-coupled network of 0 and junctions and shows successive phase transitions. The firsttransition occurs inside each grain at Tc1 = 81 K, and the second transition occurs among thegrains at Tc2 = 47 K. A magnetic glass behavior similar to those of spin-glasses is observed attemperatures below Tc2. The memory phenomena are investigated by recording the zero-fieldcooledand thermoremanent magnetizations measured on heating after the cooling process witha halt at Ts = 41 K. Memory effects of the halt are imprinted in the system when the sampleis re-heated. In the case without a field switch at Ts, the influence of the halt is confined to anarrow temperature region near Ts whereas the memory effect of the halt employing a field switchis extended over a wide temperature region below Ts. The results suggest that chiral-glass orderingoccurs at Tc2 in the ceramic YBCO.
Kajitani, Koji,Ken-Ichi, Honda,Terada, Hiroyuki,Yasui, Tomoyo,Sumi, Toshiyuki,Koyama, Masayasu,Ishiko, Osamu Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.18
The p53 gene is inactivated by the human papillomavirus (HPV) E6 protein in the majority of cervical cancers. Treatment of HeLa S3 cells with siRNA for HPV E6 permitted adenovirus-mediated transduction of a p53 gene linked to an upstream estrogen response element (ERE). Our previous study in non-siRNA treated HHUA cells, which are derived from an endometrial cancer and express estrogen receptor ${\beta}$, showed enhancing effects of an upstream ERE on adenovirus-mediated p53 gene transduction. In HeLa S3 cells treated with siRNA for HPV E6, adenovirus-mediated transduction was enhanced by an upstream ERE linked to a p53 gene carrying a proline variant at codon 72, but not for a p53 gene with arginine variant at codon 72. Expression levels of p53 mRNA and Coxsackie/adenovirus receptor (CAR) mRNA after adenovirus-mediated transfer of an ERE-linked p53 gene (proline variant at codon 72) were higher compared with those after non-ERE-linked p53 gene transfer in siRNA-treated HeLa S3 cells. Western blot analysis showed lower ${\beta}$-tubulin levels and comparatively higher p53/${\beta}$-tubulin or CAR/${\beta}$-tubulin ratios in siRNA-treated HeLa S3 cells after adenovirus-mediated ERE-linked p53 gene (proline variant at codon 72) transfer compared with those in non-siRNA-treated cells. Apoptosis, as measured by annexin V binding, was higher after adenovirus-mediated ERE-linked p53 gene (proline variant at codon 72) transfer compared with that after non-ERE-linked p53 gene transfer in siRNA-treated cells.