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Deposition-Temperature Dependence of ZnO/Si Grown by Pulsed Laser Deposition
손창식,김영환,Homero Castaneda LOPEZ,최인훈,Ki Hyun YOON,Sang-Mun KIM,김성일,Yong Tae KIM 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
We have investigated structural and optical properties of ZnO lms deposited on (100) Si substrates at various deposition temperatures by pulsed laser deposition. All the ZnO lms show columnar structure due to the growth behavior of ZnO; the (0001) plane has the fastest growth rate, but on increasing the deposition temperature the lm texture varies from c-axis orientation normal to substrate surface to random orientation. This tendency can be explained by the negative activation energy evaluated from growth rate as a function of inverse deposition temperature, which implies that ZnO lms are grown in a surface-kinetics-limited regime. FWHM of the UV-emission peak does not change at various deposition temperatures, and its mean value is about 115 meV. In contrast to FWHM, the intensity of UV emission drastically increases with increasing deposition temperature, due to the reduction of grain-boundary recombination effect.
Photoluminescence of Er-implanted GaN
손창식,Seong-Il Kim,Akihiro Wakahara,Homero Castaneda Lapez,Il-Ki Han,최인훈,Yong Tae Kim,Young-Hwan Kim 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
Visible green emission has been observed from Er(Erbium)-doped GaN epilayers. Various doses of Er ions were implanted in GaN epilayers by using ion implantation. The optical properties of Er-doped GaN were analyzed by using photoluminescence (PL). Sharp emission lines due to inner 4f shell transitions for Er3+ were observed in the PL spectrum of Er-implanted GaN. The emission spectrum consisted of two narrow green lines, 537 and 558 nm. The green emission lines were identied as Er3+ transitions from the 5H11=2 and the 4S3=2 levels to the 4I15=2 ground state. The stronger peaks in the 5 1014 cmက2 sample, together with the relatively higher intensity of the Er3+ luminescence in the lower doped sample, indicate that some damage remains in the 1 1015 cmက2 sample.
양원석 ( Wonseog Yang ),이재민 ( Jeamin Lee ),김창규 ( Changkyu Kim ),안승호 ( Seungho Ahn ),( Homero Castaneda ) 한국부식방식학회 2021 Corrosion Science and Technology Vol.20 No.4
To improve corrosion resistance and reduce the hydrogen uptake of 22MnB5, up to 5% Mg was added to the AlSi coating of 22MnB5. After hot-stamping and electrocoating were done on the metallic-coated specimen, the surface characteristics of the steel, hydrogen uptake content, and corrosion resistance were examined by transmittance electron microscopy, thermal desorption spectrometry, cyclic corrosion testing, and electrochemical impedance spectroscopy. Mg was investigated as MgO on the surface layer after hotstamping while it existed as Mg<sub>2</sub>Si before hot-stamping. The total hydrogen content of 22MnB5 was decreased along with the Mg content. However, there was no difference at 0.2 wt% or more. When a small amount of Mg was added, the coating corrosion resistance was decreased, but when it was added at around 1.0 wt%, the greatest corrosion resistance increase was seen. However, when 3 wt% or more was added excessively, the corrosion resistance was decreased. MgO on the surface was considered to suppress H uptake by the AlSi melting solution and increase the barrier effect of the coating.
Edwin David Morales-Álvarez,Claudia Marcela Rivera-Hoyos,Angélica María Baena-Moncada,Patricia Landázuri,Raúl A. Poutou-Piñales,Homero Sáenz-Suárez,Luis A. Barrera,Olga Y. Echeverri-Peña 한국미생물학회 2013 The journal of microbiology Vol.51 No.2
The sulfatase family involves a group of enzymes with a large degree of similarity. Until now, sixteen human sulfatases have been identified, most of them found in lysosomes. Human deficiency of sulfatases generates various genetic disorders characterized by abnormal accumulation of sulfated intermediate compounds. Mucopolysaccharidosis type II is characterized by the deficiency of iduronate 2-sulfate sulfatase (IDS), causing the lysosomal accumulation of heparan and dermatan sulfates. Currently, there are several cases of genetic diseases treated with enzyme replacement therapy, which have generated a great interest in the development of systems for recombinant protein expression. In this work we expressed the human recombinant IDS-Like enzyme (hrIDS-Like) in Escherichia coli DH5α. The enzyme concentration revealed by ELISA varied from 78.13 to 94.35 ng/ml and the specific activity varied from 34.20 to 25.97 nmol/h/mg. Western blotting done after affinity chromatography purification showed a single band of approximately 40 kDa, which was recognized by an IgY polyclonal antibody that was developed against the specific peptide of the native protein. Our 100 ml-shake-flask assays allowed us to improve the enzyme activity seven fold,compared to the E. coli JM109/pUC13-hrIDS-Like system. Additionally, the results obtained in the present study were equal to those obtained with the Pichia pastoris GS1115/pPIC-9-hrIDS-Like system (3 L bioreactor scale). The system used in this work (E. coli DH5α/pGEX-3X-hrIDS-Like)emerges as a strategy for improving protein expression and purification, aimed at recombinant protein chemical characterization,future laboratory assays for enzyme replacement therapy, and as new evidence of active putative sulfatase production in E. coli.
Physiological adaptations induced by swimming in mice fed a high fat diet
Pedro Augusto Silva Nogueira,Miriam Pimenta Pereira,Jeferson José Gomes Soares,Anderson Ferraz Norton Filho,Izadora Mayumi Fujinami Tanimoto,Ivana Alice Teixeira Fonseca,Homero Oliveira Avelar,Francoi 한국운동재활학회 2017 JER Vol.13 No.3
This study examined physiological variables of animals fed with a high-fat diet (HFD) or with a normal diet (ND) subjected to swimming at low and moderate level. Over 16 weeks, a group of animals was fed with HFD or ND, and at the 8 weeks, they started swimming with 50% or 80% of the maximum load achieved in the progressive work test. Weekly, body weight and the amount of ingested food were registered. The gly-cemic level was measured at the beginning, middle and at the end of the experiment. Adipose tissue, gastrocnemius muscles and hearts were collected for morphometry. The results showed that the animals fed an HFD had a minor caloric intake; however, the HFD increased body weight and adiposity, likely causing cardiac hypertrophy and an increase in the glycemic level. In this context, swimming with an 80% load contributed positively to weight control, adiposity, glycemic level, to control cardiac hypertrophy and induce hypertrophy in the gastroc-nemius muscle. All parameters assessed showed better results for the ND animals. Therefore, the importance of fat consumption was empha-sized in relation to obesity onset. The practice of swimming with an 80% load produced greater benefits than swimming with a 50% load for overweight treatment.
Eduardo de Paula Miranda,Cristiano Mendes Gomes,Fábio César Miranda Torricelli,José de Bessa Júnior,José Everton de Castro,Bruno Roberto da Silva Ferreira,Ariel Gustavo Scafuri,Homero Bruschini,Miguel 대한배뇨장애요실금학회 2014 International Neurourology Journal Vol.18 No.2
Purpose: Lower urinary tract symptoms are numerous, but the specific impact of each of these symptoms on the quality of life (QoL) has not been evaluated in community-dwelling men. An assessment of these symptoms and their effects on QoL was the focus of this study. Methods: We performed a cross-sectional study with 373 men aged >50 years from a community setting. Patients completed the International Prostate Symptom Score questionnaire, which includes questions on each of the specific urinary symptoms and a question addressing health-related QoL that are graded from 0 to 5. We used the Pearson correlation test to assess the impact of each symptom on QoL. Results: Nocturia (58.9%) was the most prevalent urinary symptom. The mean score was 0.9±1.4 for incomplete emptying, 1.0±1.5 for frequency, 0.9±1.3 for intermittency, 0.8±1.3 for urgency, 1.0±1.5 for weak stream, 0.5±1.0 for straining, and 2.0±1.6 for nocturia. Nocturia and frequency were the only symptoms associated with poorer QoL, with nocturia showing a stronger association. Conclusions: Nocturia affects 50% of community dwelling men aged >50 years, and is the lower urinary tract symptom with the greatest negative impact on QoL.