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- 저자 : Torrico, Raul (검색결과 5 건)
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( Damir Dennis Torrico ),( Marlene E. Janes ),( Hong Kyoon No ),( Sujinda Sriwattana ),( Witoon Prinyawiwatkul ) 한국키틴키토산학회 2013 한국키틴키토산학회지 Vol.18 No.2
Antimicrobial activities of chitosan solutions (pH 5.6) with different molecular weights (470 and 1,100 kDa) and concentrations (0.5 and 1.0% in 1.0% acetic acid) against Listeria monocytogenes and Escherichia coli O157:H7 were evaluated during 4 weeks of storage at -20, 4 and 25 o C. Antimicrobial activities of chitosan solutions decreased with increasing storage periods. Higher antimicrobial activity was observed at lower storage temperatures. 470 kDa chitosan showed stronger antimicrobial activity against L. monocytogenes, while 1,100 kDa chitosan was slightly more effective against E. coli. For both bacteria, 1.0% chitosan was more effective than 0.5%. Only 1,100 kDa chitosan (1.0%) showed significant decreases in viscosity over time. At 25 o C, a significant correlation (r=0.97; P<0.05) between antimicrobial activity (log CFU/mL reduction) against L. monocytogenes and viscosity of 1,100 kDa chitosan solution at 1.0% was observed. Antimicrobial activity of chitosan was dependent on molecular weight, concentration, storage temperature and time.
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Akram Hernández-Vásquez,Horacio Chacón-Torrico 한국역학회 2019 Epidemiology and Health Vol.41 No.-
OBJECTIVES: Early initiation of breastfeeding (EIBF) is one of the most cost-effective strategies to reduce neonatal mortality. We sought to determine the prevalence and determinants of EIBF in Peru. METHODS: We performed a cross-sectional analytical study of the 2018 Peruvian Demographic and Family Health Survey as a secondary data source. In total, 19,595 children born during the 5 years prior to the survey were included in the study. The dependent variable (EIBF status), socio-demographic variables, and pregnancy-related variables were analyzed using a multivariate logistic regression model to identify the determinants of EIBF. RESULTS: The prevalence of EIBF in the study population was 49.7%. Cesarean deliveries were associated with a lower likelihood of EIBF (adjusted odds ratio [aOR], 0.06; 95% confidence interval [CI], 0.05 to 0.07) than were vaginal deliveries. Newborns born at public health centers (aOR, 1.37; 95% CI, 1.15 to 1.65) had a higher rate of EIBF than those not born at public or private health centers. Women from the jungle region (aOR, 2.51; 95% CI, 2.17 to 2.89) had higher odds of providing EIBF than those from the coast. Mothers with more than a secondary education (aOR, 0.65; 95% CI, 0.55 to 0.76) were less likely to breastfeed during the first hour of the newborn’s life than women with primary or no education. CONCLUSIONS: More than half of Peruvian children do not breastfeed during the first hour after birth. The major determinants of EIBF status were the delivery mode and the region of maternal residence. Strategies are needed to promote early breastfeeding practices.
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Heat-induced coarsening of layer-by-layer assembled mixed Au and Pd nanoparticles
Shon, Young-Seok,Shon, Dayeon Judy,Truong, Van,Gavia, Diego J.,Torrico, Raul,Abate, Yohannes Techno-Press 2014 Advances in nano research Vol.2 No.1
This article shows the coarsening behavior of nanoparticle multilayers during heat treatments which produce larger metallic nanostructures with varying shapes and sizes on glass slides. Nanoparticle multilayer films are initially constructed via the layer-by-layer self-assembly of small and monodispersed gold and/or palladium nanoparticles with different compositions (gold only, palladium only, or both gold and palladium) and assembly orders (compounding layers of gold layers over palladium layers or vice versa). Upon heating the slides at $600^{\circ}C$, the surface nanoparticles undergo coalescence becoming larger nanostructured metallic films. UV-Vis results show a clear reliance of the layering sequence on the optical properties of these metal films, which demonstrates an importance of the outmost (top) layers in each nanoparticle multilayer films. Topographic surface features show that the heat treatments of nanoparticle multilayer films result in the nucleation of nanoparticles and the formation of metallic cluster structures. The results confirm that different composition and layering sequence of nanoparticle multilayer films clearly affect the coalescence behavior of nanoparticles during heat treatments.
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Akram Herná,ndez-Vá,squez,Horacio Chacó,n-Torrico 한국역학회 2019 Epidemiology and Health Vol.41 No.-
OBJECTIVES: Early initiation of breastfeeding (EIBF) is one of the most cost-effective strategies to reduce neonatal mortality. We sought to determine the prevalence and determinants of EIBF in Peru. METHODS: We performed a cross-sectional analytical study of the 2018 Peruvian Demographic and Family Health Survey as a secondary data source. In total, 19,595 children born during the 5 years prior to the survey were included in the study. The dependent variable (EIBF status), socio-demographic variables, and pregnancy-related variables were analyzed using a multivariate logistic regression model to identify the determinants of EIBF. RESULTS: The prevalence of EIBF in the study population was 49.7%. Cesarean deliveries were associated with a lower likelihood of EIBF (adjusted odds ratio [aOR], 0.06; 95% confidence interval [CI], 0.05 to 0.07) than were vaginal deliveries. Newborns born at public health centers (aOR, 1.37; 95% CI, 1.15 to 1.65) had a higher rate of EIBF than those not born at public or private health centers. Women from the jungle region (aOR, 2.51; 95% CI, 2.17 to 2.89) had higher odds of providing EIBF than those from the coast. Mothers with more than a secondary education (aOR, 0.65; 95% CI, 0.55 to 0.76) were less likely to breastfeed during the first hour of the newborn’s life than women with primary or no education. CONCLUSIONS: More than half of Peruvian children do not breastfeed during the first hour after birth. The major determinants of EIBF status were the delivery mode and the region of maternal residence. Strategies are needed to promote early breastfeeding practices.
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Samuel Vasconcelos Araujo,Peter Zacharias,Benjamin Sahan,Rene P. Torrico Bascope,Fernando L. M. Antunes 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
Usually considered as one of the future solutions for grid connection of photovoltaic systems, module integrated converters were already the focus of several researches and projects. Most of the proposed approaches relied so far on the use of high frequency step-up transformers either in isolated operation or integrated in isolated dc-dc topologies. This paper analyses the possibility of using non-isolated topologies to achieve the necessary high-voltage gain for grid connection. Several circuits were analyzed and the best suited one for the current application was evaluated and optimized. Experimental results are presented in the final section.
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