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Circumferential irradiation for interstitial coagulation of urethral stricture.
Nguyen, Trung Hau,Rhee, Yun-Hee,Ahn, Jin-Chul,Kang, Hyun Wook Optical Society of America 2015 Optics express Vol.23 No.16
<P>An optical diffuser was developed to achieve radially uniform light irradiation by micro-machining helical patterns on the fiber surface for endoscopically treating urethral stricture. Spatial emission from the diffuser was evaluated by goniometric measurements. A computational model was developed to predict spatio-temporal heat distribution during the interstitial coagulation. The fabricated diffuser yielded circumferential light distribution with slightly concentrated energy at the proximal end. Both simulation and tissue testing demonstrated approximately 1-mm coagulation thickness at 6 W for 10 sec with 1470 nm. The proposed optical diffuser may be a feasible tool to treat the urethral stricture in a uniform manner.</P>
( Trung Hau Nguyen ),( Chae Hun Ra ),( In Yung Sunwoo ),( Gwi-taek Jeong ),( Sung-koo Kim ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.6
Bioethanol was produced from Kappaphycus alvarezii seaweed biomass using separate hydrolysis and fermentation (SHF). Pretreatment was evaluated for 60 min at 121ºC using 12% (w/v) biomass slurry with 364 mM H2SO4. Enzymatic saccharification was then carried out at 45ºC for 48 h using Celluclast 1.5 L. Ethanol fermentation with 12% (w/v) K. alvarezii hydrolyzate was performed using the yeasts Saccharomyces cerevisiae KCTC1126, Kluyveromyces marxianus KCTC7150, and Candida lusitaniae ATCC42720 with or without prior adaptation to high concentrations of galactose. When non-adapted S. cerevisiae, K. marxianus, and C. lusitaniae were used, 11.5 g/l, 6.7 g/l, and 6.0 g/l of ethanol were produced, respectively. When adapted S. cerevisiae, K. marxianus, and C. lusitaniae were used, 15.8 g/l, 11.6 g/l, and 13.4 g/l of ethanol were obtained, respectively. The highest ethanol concentration was 15.8 g/l, with YEtOH = 0.43 and YT% = 84.3%, which was obtained using adapted S. cerevisiae.
The Effectiveness of Macroprudential Policy on Credit Growth at Bank-Level Data in Vietnam
Hau Trung NGUYEN,Anh Thi Hoang PHAM,Thuy T. DANG 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.8
The study investigates the effectiveness of the macroprudential policy on credit growth in Vietnam. The authors use the logic of the transmission mechanism of macroprudential policy on credit growth. Research variables include economic growth, inflation, interest rate, and quarterly bank-level data from 28 commercial banks in Vietnam during 2011–2018. The results reveal that: (i) GDP growth had a positive impact on credit growth of small banks but had no impact on large banks, (ii) Domestic Systemically Important Banks (D-SIBs) and small banks respond differently to macroprudential measures of imposing different credit growth targets for different bank groups, (iii) Restrictions on foreign currency loans are found to be effective in curbing credit growth for the full sample and small banks, (iv) Inflation and economic cycle have significantly impacted credit growth at bank-level in Vietnam and (v) Interestingly, a significant positive relationship between interest rates and credit growth is found for the full sample and D-SIBs in Vietnam. The findings suggest that a stable macroeconomic environment should be good conditions for financial stability, and monetary authority should pay more attention to small banks’ behaviors than D-SIBs behavior, toward such “administration” tools since small banks tend to prefer “breaking the rules” to make profits.
Trung Hau Nguyen,YongGyeong Kim,Jin-Sung Kim,Yulah Jeong,Hye Min Park,Jin Woo Kim,Ji-Eun Kim,Hyemin Kim,Nam-Soo Paek,강창호 한국생물공학회 2020 Biotechnology and Bioprocess Engineering Vol.25 No.2
To expect the positive physiological functions from probiotic consumption, the lactic acid bacteria should survive, partially, in the gastrointestinal (GI) tract. This study aimed to evaluate the viable stability of probiotic bacterial cells (Lactobacillus plantarum MG989, L. fermentum MG901, Streptococcus thermophilus MG5140, Lactococcus lactis MG5125, and Enterococcus faecium MG89-2) that were coated with sodium alginate and pumpkin powder (SP) by comparing their resistance in simulated intestinal fluid (with pancreatin) and simulated gastric fluid (with pepsin) in vitro with that of the non-coated free cells. The viable stability was determined by counting cells with colony forming unit (CFU) from agar plate culture of SP coated and non-coated free cells in simulated GI conditions. Survival rate enhanced up to 28.7% and 14.0% in the condition of simulated gastric fluid and simulated intestinal fluid, respectively. The results showed that the SP coated cells exhibited considerably greater resistance to the simulated gastric fluid than the activated cells (p < 0.001), showing that the SP coating may enhance the survival of probiotic bacteria after consumption during their transit through the GI tract after freeze-drying process.
Nguyen, Trung Hau,Ra, Chae Hun,Sunwoo, In Yung,Jeong, Gwi-Taek,Kim, Sung-Koo The Korean Society for Microbiology and Biotechnol 2016 Journal of microbiology and biotechnology Vol.26 No.7
Bioethanol was produced from Kappaphycus alvarezii seaweed biomass using separate hydrolysis and fermentation (SHF). Pretreatment was evaluated for 60 min at 121℃ using 12% (w/v) biomass slurry with 364 mM H<sub>2</sub>SO<sub>4</sub>. Enzymatic saccharification was then carried out at 45℃ for 48 h using Celluclast 1.5 L. Ethanol fermentation with 12% (w/v) K. alvarezii hydrolyzate was performed using the yeasts Saccharomyces cerevisiae KCTC1126, Kluyveromyces marxianus KCTC7150, and Candida lusitaniae ATCC42720 with or without prior adaptation to high concentrations of galactose. When non-adapted S. cerevisiae, K. marxianus, and C. lusitaniae were used, 11.5 g/l, 6.7 g/l, and 6.0 g/l of ethanol were produced, respectively. When adapted S. cerevisiae, K. marxianus, and C. lusitaniae were used, 15.8 g/l, 11.6 g/l, and 13.4 g/l of ethanol were obtained, respectively. The highest ethanol concentration was 15.8 g/l, with Y<sub>EtOH</sub> = 0.43 and Y<sub>T%</sub> = 84.3%, which was obtained using adapted S. cerevisiae.