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Photo- and radio- luminescence characterizations in rare-earth-doped SrAl2O4 crystals
Daisuke Nakauchi,Masanori Koshimizu,Noriaki Kawaguchi,Takayuki Yanagida 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
SrAl2O4 bulk crystals doped with all rare-earth (RE) ions except for Sc, Y, La, Pm and Lu were synthesized by the optical floating zone method to systematically investigate the photoluminescence (PL) and radioluminescence (RL) properties for radiation detector applications. The crystal samples show PL and RL signals due to the 5d-4f or 4f-4f transitions of doped RE ions, and each decay curve consists of a sum of exponential functions with the typical decay time constants. Under VUV photon excitation, the Ce-, Pr-, Eu-, Tb-, Dy- and Ho-doped samples exhibit PL predominantly with two broad emission bands around 320 and 600 nm, which are possibly due to self-trapped excitons (STEs) perturbed by RE ions.
( Yuki Wada ),( Hideyuki Tamai ),( Akira Kawashima ),( Naoki Shingaki ),( Yoshiyuki Mori ),( Masanori Kawaguchi ),( Kosaku Moribata ),( Hisanobu Deguchi ),( Kazuki Ueda ),( Izumi Inoue ),( Takao Maeki 대한소화기학회 2014 Gut and Liver Vol.8 No.4
Background/Aims: The present study aimed to clarify whether virological response within 2 weeks after therapy initiation can predict a null response to pegylated interferon α-2b plus ribavirin therapy in patients with high viral load genotype 1b hepatitis C. Methods: The participants consisted of 72 patients with high viral load genotype 1b. The dynamics of viral load within 2 weeks were measured. Results: Significant differences between null responders and nonnull responders were noted for interleukin (IL)-28B genotype, amino acid 70 substitution, α-fetoprotein, low-density lipoprotein cholesterol, hyaluronic acid, and viral response. The area under the curve (AUC) for the receiver operating characteristic curve of the hepatitis C virus (HCV) RNA level decline at 2 weeks (AUC=0.993) was the highest among the factors predicting the null response. When the cutoff value for the HCV RNA level decline at 2 weeks was set at 0.80 log, the sensitivity, specificity, positive predictive value, negative predictive value, and accuracy in predicting a null response were 82%, 96%, 82%, 96%, and 94%, respectively. In comparison, values for the non-TT and mutant type of amino acid 70 substitution were similar to those for HCV RNA level decline at 2 weeks. Conclusions: Virological response at 2 weeks or the combination of IL-28B and amino acid 70 substitution are accurate predictors of a null response. (Gut Liver 2014;8:421-427)