University of San Simon

Cochabamba, Bolivia

University of San Simon

Cochabamba, Bolivia
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Perez-Rea D.,Lund University | Perez-Rea D.,University of San Simon | Rojas C.,University of San Simon | Carballo S.,University of San Simon | And 3 more authors.
Starch/Staerke | Year: 2013

The susceptibility to enzymatic hydrolysis of starch extracted from raw roots of Canna indica, Manihot esculenta and Xanthosoma sagittifolium, grown in Bolivia, were studied below the gelatinization temperature. The granule size and amylose content were as followed: C. indica>M. esculenta>X. sagittifolium. The hydrolysis showed a rapid rate at the initial stage, followed by a progressive decrease thereafter. At 30, 40 and 50°C, during the initial stage, the rate of hydrolysis was observed to be influenced by the size of the granules, being the highest for the small sized granules X. sagittifolium, followed by the medium sized granules M. esculenta and the lowest rate was for the large sized granules C. indica starch. During the slow phase, A-type M. esculenta and B-type C. indica showed higher hydrolysis rates than A-type X. sagittifolium. At 60°C, a positive correlation was found between the amylose content and the rate of hydrolysis among the starches. Microscopic observations showed a pattern of attack by the enzyme towards C. indica starch granules, suggesting that high amylose content is concentrated around the hilum. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Fernandez A.,University of San Simon | Duran D.G.N.,University of San Simon | Infante A.,University of Chile | Bergel A.,University of Chile
2015 IEEE 1st International Workshop on Software Analytics, SWAN 2015 - Proceedings | Year: 2015

Dynamic analyses tools are seldom crafted by practitioners. This paper discusses the benefits of supporting the practitioners to build their ad-hoc tool and presents our experience to lower the barrier to gather dynamic information. The experience we present is driven by the combination of the Spy profiling framework and the Roassal visualization engine, two frameworks used in industry and academia. We conclude with two question to discuss at the workshop. © 2015 IEEE.

Zabalaga R.F.,University of Sao Paulo | Carballo S.C.,University of San Simon
Journal of Food Processing and Preservation | Year: 2015

In this study, we modeled the convective drying of unripe banana slices and the water adsorption behavior of the banana flour. Drying experiments were conducted at temperatures from 30 to 60C with an air velocity of 1.5m/s, and adsorption isotherms were measured at 15, 25 and 35C. A four-parameter empirical model that we proposed fitted quite satisfactorily with the experimental drying data. In addition, the drying behavior during the first hours was described by an effective diffusivity coefficient, which ranges from 1.2×10-10 m2/s to 6.6×10-10m2/s. The observed sigmoid adsorption isotherms of unripe banana flour were modeled quite well by the GAB equation. Estimated monolayer moisture content has values between 0.08 and 0.09g/g. © 2015 Wiley Periodicals, Inc.

de Godos I.,University of Valladolid | de Godos I.,Aqualia Gestion Integral del Agua S.A. | Vargas V.A.,University of San Simon | Guzman H.O.,University of San Simon | And 4 more authors.
Water Research | Year: 2014

The carbon and nitrogen removal potential of an innovative anoxic-aerobic photobioreactor configuration operated with both internal and external recyclings was evaluated under different cyanobacterial-bacterial sludge residence times (9-31 days) during the treatment of wastewaters with low C/N ratios. Under optimal operating conditions, the two-stage photobioreactor was capable of providing organic carbon and nitrogen removals over 95% and 90%, respectively. The continuous biomass recycling from the settler resulted in the enrichment and predominance of rapidly-settling cyanobacterial-bacterial flocs and effluent suspended solid concentrations lower than 35mg VSS L-1. These flocs exhibited sedimentation rates of 0.28-0.42mh-1 but sludge volumetric indexes of 333-430ml/g. The decoupling between the hydraulic retention time and sludge retention time mediated by the external recycling also avoided the washout of nitrifying bacteria and supported process operation at biomass concentrations of 1000-1500mg VSS L-1. The addition of additional NaHCO3 to the process overcame the CO2 limitation resulting from the intense competition for inorganic carbon between cyanobacteria and nitrifying bacteria in the photobioreactor, which supported the successful implementation of a nitrification-denitrification process. Unexpectedly, this nitrification-denitrification process occurred both simultaneously in the photobioreactor alone (as a result of the negligible dissolved oxygen concentrations) and sequentially in the two-stage anoxic-aerobic configuration with internal NO3 -/NO2 - recycling. © 2014 Elsevier Ltd.

Freudenthal F.P.,University of San Andrés | Heath A.,University of San Andrés | Villanueva J.,University of San Andrés | Mendes J.,University of San Andrés | And 6 more authors.
Cardiology in the Young | Year: 2012

Background: Interventional closure of patent arterial duct has become an accepted alternative to surgical closure. Clinical trial with "Nit-Occlud® PDA-R". Methods and results: To assess the safety and efficacy of the device, we performed a prospective clinical study between June, 2009 and December, 2010 in La Paz, Bolivia. In all, 29 - 22 female patients and 7 male patients - out of 59 patients were selected on the basis of inclusion criteria. The procedures were performed under sedation at an age and weight of 5.7 years and 22.7 kilograms, respectively, with 4-6 French arterial sheaths and 5-7 French venous sheaths. The minimal diameter of the duct was 3.5 millimetres. The procedure, fluoroscopy, and hospitalisation times were 96.4 minutes (55 to 145), 13.1 minutes (3 to 25.2), and 24 hours, respectively. The "Nit-Occlud® PDA-R" was successfully deployed in all patients. Immediate, 24-hour, 1-, 3-, and 6-month closure rates were 65.5%, 79.3%, 96.5%, and 100%, respectively. The systolic pulmonary pressure diminished from 37 millimetres of mercury (21 to 57) before the intervention to 31 millimetres of mercury (21 to 45) after the intervention. No early or late embolisation, haemolysis, left pulmonary artery, or descending aorta obstruction occurred. Conclusions: We conclude that the "Nit-Occlud® PDA-R" device is safe and effective in closing patent arterial duct up to a diameter of 8 millimetres. © 2011 Cambridge University Press.

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