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I. C. Robin,C. Tavares,J. Rothman,G. Feuillet,A. H. El-Shaer,A. Bakin,A. Waag,Le Si Dang 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
The structural and the spectroscopic properties of a 2-inch ZnO epilayer grown by using molecular beam epitaxy are investigated. A 500-nm-thick substrate was grown on c-sappire by using a MgO buffer. In spite of the high dislocation density in the epilayer, temperature-dependent photoluminescence measurements show only a small decrease in the luminescence intensity between 4 K and 300 K. Time-resolved photoluminescence measurements reveal a decay time independent of temperature. Cathodoluminescence presents an inhomogeneous emission on a micrometric scale: a stronger emission is measured in small nanometric areas. A tentative explanation of this behavior is proposed.
Aleksandro S. Da Silva,Vinicius R. Fanfa,Mateus A. Otto,Lucas T. Gressler,Kaio C.S. Tavares,Cicera R. Lazzarotto,Alexandre A. Tonin,Luiz C. Miletti,Marta M. M. F. Duarte,Silvia G. Monteiro 대한기생충학열대의학회 2011 The Korean Journal of Parasitology Vol.49 No.4
The aim of this study was to test the susceptibility of mice to Trypanosoma evansi treated with human plasma containing different concentrations of apolipoprotein L-1 (APOL1). For this experiment, a strain of T. evansi and human plasma (plasmas 1, 2, and 3) from 3 adult males clinically healthy were used. In vivo test used 50 mice divided in 5 groups (A to E) with 10 animals in each group. Animals of groups B to E were infected, and then treated with 0.2 ml of human plasma in the following outline: negative control (A), positive control (B), treatment with plasma 1 (C), treatment with plasma 2 (D), and treatment with plasma 3 (E). Mice treated with human plasma showed an increase in longevity of 40.9±0.3 (C), 20±9.0 (D) and 35.6±9.3 (E) days compared to the control group (B) which was 4.3±0.5 days. The number of surviving mice and free of the parasite (blood smear and PCR negative) at the end of the experiment was 90%, 0%, and 60% for groups C, D, and E, respectively. The quantification of APOL1 was performed due to the large difference in the treatments that differed in the source plasma. In plasmas 1, 2, and 3 was detected the concentration of 194, 99, and 115 mg/dl of APOL1, respectively. However, we believe that this difference in the treatment efficiency is related to the level of APOL1 in plasmas.
Photoluminescence Dynamics in ZnO Nanorods
I. C. Robin,B. Gauron,M. Rosina,P. Ferret,C. Tavares,G. Feuillet,Le Si Dang,B. Gayral,J. M. Gera 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Low-temperature cathodoluminescence and temperature-dependent time-resolved photoluminescence are used to investigate the emission properties of ZnO nanowires grown by using metal organic vapor-phase epitaxy. In particular, temperature-dependent decay-time measurements show that at temperatures up to room temperature, the escape toward non-radiative channels is limited in the ZnO nanowires. Low-temperature cathodoluminescence and temperature-dependent time-resolved photoluminescence are used to investigate the emission properties of ZnO nanowires grown by using metal organic vapor-phase epitaxy. In particular, temperature-dependent decay-time measurements show that at temperatures up to room temperature, the escape toward non-radiative channels is limited in the ZnO nanowires.
I. C. Robin,A. Jouini,C. Tavares,J. Rothman,G. Feuillet,D. Ehrentraut,T. Fukuda 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Homoepitaxial layers grown by liquid phase epitaxy on hydrothermally grown ZnO bulk wafers are studied by means of temperature-dependent photoluminescence. The properties of the films are compared to those of hydrothermal ZnO substrates. The effect of Ga doping is studied. Liquid phase epitaxy is shown to be a promising method for achieving substantial variations of the electrical and the luminescent properties of ZnO.