Browsing by Autor "Freddy Soria"

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Análisis multitemporal y espacial del sedimento depositado en el embalse San Jacinto
(Mexican Institute of Water Technology, 2024) Moisés Perales; Freddy Soria; Oliver Saavedra; Centro de Investigación en Agua, Energía y Sostenibilidad (Cinaes), Universidad Católica Boliviana, La Paz, Bolivia; Oliver Saavedra; Centro de Investigaciones en Ingeniería Civil y Ambiental (CIICA), Universidad Privada Boliviana, Cochabamba, Bolivia
El tratamiento y análisis de las mediciones topobatimétricas genera una mejor comprensión de la dinámica sedimentaria de un embalse; esto contribuye a los encargados de la operación del embalse a implementar mejores prácticas de manejo, además de diseñar e implementar medidas efectivas para el manejo y conservación de estas importantes infraestructuras para asegurar su sostenibilidad. El propósito de este estudio fue analizar la información disponible de las topobatimetrías del embalse San Jacinto que fueron ejecutadas en 1989, 1995, 2004, 2013, 2016 y 2019, para así poder determinar la variación temporal y espacial del sedimento depositado. Este estudio permitió identificar los cursos de agua de mayor aporte de sedimentos y los patrones morfológicos longitudinales. Los resultados muestran que en 30 años de operación se tiene un volumen acumulado de sedimento de 16.5 hm3, 3.1 hm3 por encima del volumen muerto previsto en proyecto, evidenciando la subestimación de la vida útil en la etapa de diseño.
Antimicrobial resistance genes are enriched in aerosols near impacted urban surface waters in La Paz, Bolivia
(Elsevier BV, 2021) Olivia Ginn; Dennis Nichols; Lucas Rocha-Melogno; Aaron Bivins; David Berendes; Freddy Soria; Marcos Andrade; Marc A. Deshusses; Mike Bergin; Joe Brown
Bioaerosol sampling optimization for community exposure assessment in cities with poor sanitation: A one health cross-sectional study
(Elsevier BV, 2020) Lucas Rocha-Melogno; Olivia Ginn; Emily S. Bailey; Freddy Soria; Marcos Andrade; Michael Bergin; Joe Brown; Gregory C. Gray; Marc A. Deshusses
Capacity-Building Initiatives to Foster Sustainable Tourism in a Climate Change Context in Bolivia
(Springer International Publishing, 2025) Georgina Chávez; Vidfa Garvizu; Freddy Soria; Omar Salinas
Detection and assessment of the antibiotic resistance of Enterobacteriaceae recovered from bioaerosols in the Choqueyapu River area, La Paz – Bolivia
(Elsevier BV, 2020) Claudia Medina; Olivia Ginn; Joe Brown; Freddy Soria; Carolina Garvizu; Ángela Skantria Salazar; Alejandra Tancara; Jhoana Herrera
Detection and quantification of enteric pathogens in aerosols near open wastewater canals in cities with poor sanitation
(2021) Olivia Ginn; Lucas Rocha-Melogno; Aaron Bivins; Sarah Lowry; Maria Cardelino; Dennis Nichols; S. N. Tripathi; Freddy Soria; Marcos Andrade; Mike Bergin
ABSTRACT Urban sanitation infrastructure is inadequate in many low-income countries, leading to the presence of highly concentrated, uncontained fecal waste streams in densely populated areas. Combined with mechanisms of aerosolization, airborne transport of enteric microbes and their genetic material is possible in such settings but remains poorly characterized. We detected and quantified enteric pathogen-associated gene targets in aerosol samples near open wastewater canals (OWCs) or wastewater-impacted surface waters and control sites in La Paz, Bolivia; Kanpur, India; and Atlanta, USA via multiplex reverse-transcription qPCR (37 targets) and ddPCR (13 targets). We detected a wide range of enteric targets, some not previously reported in extramural urban aerosols, with more frequent detections of all enteric targets at higher densities in La Paz and Kanpur near OWCs. We report density estimates ranging up to 4.7 × 10 2 gc per m 3 air across all targets including heat stabile enterotoxigenic E. coli, C. jejuni , enteroinvasive E. coli/Shigella spp., Salmonella spp., norovirus, and Cryptosporidium spp. An estimated 25%, 76%, and 0% of samples containing positive pathogen detects were accompanied by culturable E. coli in La Paz, Kanpur, and Atlanta, respectively, suggesting potential for viability of enteric microbes at the point of sampling. Airborne transmission of enteric pathogens merits further investigation in cities with poor sanitation. SYNOPSIS We detected and quantified molecular targets associated with important enteric pathogens in outdoor aerosols in cities with poor sanitation to assess the potential role of the aeromicrobiological pathway in enteric infection transmission in such settings.
Detection and Quantification of Enteric Pathogens in Aerosols Near Open Wastewater Canals in Cities with Poor Sanitation
(American Chemical Society, 2021) Olivia Ginn; Lucas Rocha-Melogno; Aaron Bivins; Sarah Lowry; Maria Cardelino; Dennis Nichols; S. N. Tripathi; Freddy Soria; Marcos Andrade; Mike Bergin
Urban sanitation infrastructure is inadequate in many low-income countries, leading to the presence of highly concentrated, uncontained fecal waste streams in densely populated areas. Combined with mechanisms of aerosolization, airborne transport of enteric microbes and their genetic material is possible in such settings but remains poorly characterized. We detected and quantified enteric pathogen-associated gene targets in aerosol samples near open wastewater canals (OWCs) or impacted (receiving sewage or wastewater) surface waters and control sites in La Paz, Bolivia; Kanpur, India; and Atlanta, USA, via multiplex reverse-transcription qPCR (37 targets) and ddPCR (13 targets). We detected a wide range of enteric targets, some not previously reported in extramural urban aerosols, with more frequent detections of all enteric targets at higher densities in La Paz and Kanpur near OWCs. We report density estimates ranging up to 4.7 × 102 gc per mair3 across all targets including heat-stable enterotoxigenic Escherichia coli, Campylobacter jejuni, enteroinvasive E. coli/Shigella spp., Salmonella spp., norovirus, and Cryptosporidium spp. Estimated 25, 76, and 0% of samples containing positive pathogen detects were accompanied by culturable E. coli in La Paz, Kanpur, and Atlanta, respectively, suggesting potential for viability of enteric microbes at the point of sampling. Airborne transmission of enteric pathogens merits further investigation in cities with poor sanitation.
Evaluation of the Vicia faba seed flour efficiency for turbidity removal in drinking water treatment. Case study: Copacabana, Bolivia
(2021) Diego Morales; Carolina Garvizu; Freddy Soria
It is evaluated the efficiency of Vicia faba (i.e., bean) seed flour, in water turbidity removal at drinking water treatment plants. The evaluation of the bean's coagulant potential was carried out through the use of extracted aqueous and saline crude extract of the pure and delipidified flour. The experimental design with three levels and three factors, pointed out to the coagulant dose and the flocculation rate as the most important variables. The optimal coagulant dose of saline raw bean flour extract and the flocculation rate determined throughout the tests, resulted in a 49% reduction in turbidity in synthetic water (kaolinite), 33% in tank water from the sump tank of the Potable Water Service Provider and Municipal Sanitary Sewerage (EPSA) of Copacabana and 91.2% of the water adduction point, which is located on the beach of the city of Copacabana.
Multicriteria Analysis For Identifying Forest Fire Risk Zones In The Biological Reserve Of The Sama Cordillera, Bolivia
(2020) S. Mariscal; Mariana Ríos; Freddy Soria
Forest fires have negative effects on biodiversity, the atmosphere and human health. The paper presents a spatial risk model as a tool to assess them. Risk areas refer to sectors prone to the spread of fire, in addition to the influence of human activity through remote sensing and multi-criteria analysis. The analysis includes information on land cover, land use, topography (aspect, slope and elevation), climate (temperature and precipitation) and socio-economic factors (proximity to settlements and roads). Weights were assigned to each in order to generate the forest fire risk map. The investigation was carried for a Biological Reserve in Bolivia because of the continuous occurrence of forest fires. Five risk categories for forest fires were derived: very high, high, moderate, low and very low. In summary, results suggest that approximately 67% of the protected area presents a moderate to very high risk; in the latter, populated areas are not dense which reduces the actual risk to the type of events analyzed.
Risk factors for enteric diseases transmission through street vended juices: Assessment from empirical data in La Paz, Bolivia
(National Institute of Environmental Health Sciences, 2024) Freddy Soria; Verónica Leytón