42 results on '"Cervantes, Alejandra"'
Search Results
2. Artificial shade effects on behavior and body weight of pregnant grazing red deer (Cervus elaphus)
- Author
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Alvarez Ramírez, Lorenzo, Mejía Huerta, Nancy G., and Sánchez Cervantes, Alejandra
- Published
- 2021
- Full Text
- View/download PDF
3. Evaluation of the Air Quality and Greenhouse Gas Benefits of an Advanced Low‐NOx Compressed Natural Gas (CNG) Engine in Medium and Heavy‐Duty Vehicles in California
- Author
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MacKinnon, Michael, Shaffer, Brendan, Cervantes, Alejandra, and Samuelsen, Scott
- Subjects
Greenhouse gases ,air quality ,compressed natural gas ,heavy duty vehicles ,simulation - Abstract
The goal of this research is to assess the greenhouse gas (GHG) emissions and air quality (AQ) impacts of transitions to advanced low‐NOx Compressed Natural Gas (CNG) engines in medium-duty vehicle (MDV) and heavy-duty vehicle (HDV) applications in California with a particular emphasis on renewable natural gas (RNG) as a fueling pathway. To evaluate regional AQ impacts in 2035, pollutant emissions from all end-use sectors are projected from current levels and spatially and temporally resolved. Scenarios are constructed beginning with both a conservative (Base Case) and more optimistic (SIP) case regarding advanced vehicle technology and fuels integration to provide spanning of potential impacts. To capture the impact of seasonal dynamics on pollutant formation and fate, two modeling periods are conducted including a winter and summer episode. To estimate the potential GHG impacts of transitions to advanced CNG engines in HDV and MDV, scenarios are evaluated under various assumptions regarding fuel pathways to meet CNG demand from a life cycle perspective. Scenarios are compared to the baseline cases assuming (1) all CNG is provided from conventional fossil natural gas and (2) under a range of possible resource availabilities associated with RNG and renewable synthetic natural gas (RSNG) from in-state resources. Key findings include: i) expanding the deployment of advanced CNG MDV and HDV can reduce summer ground-level ozone concentrations and groundlevel PM2.5 in key regions of California; ii) the largest AQ benefits are associated with reducing emissions from HDV; iii) in-state RNG pathways can meet the CNG demand estimated for both baseline cases; iv) in-state resources are unable to entirely meet CNG demand for the high total CNG demand estimated for the majority of Base alternative cases, and v) advanced CNG HDV and MDV can moderately reduce GHG emissions if fossil natural gas is used (14 to 26%).
- Published
- 2017
4. Advanced Low-NOx Compressed Natural Gas Engines in Medium- and Heavy-Duty Vehicles Are Poised to Deliver Air Quality Benefits and Advance California’s Climate Goals
- Author
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MacKinnon, Michael, Shaffer, Brendan, Cervantes, Alejandra, and Samuelsen, Scott
- Abstract
Recent commercialization of advanced low-nitrogen oxides (NOx) Compressed Natural Gas (CNG) engines for medium- (MDV) and heavy-duty (HDV) vehicles has garnered significant interest due to the potential air quality benefits. Further, utilizing renewable natural gas (RNG) in advanced CNG engines from sources such as biomass and/ or biogas can achieve reductions in greenhouse gas (GHG) relative to using petroleum fuels and fossil CNG. However, the regional air quality and GHG reduction benefits of large‐scale deployment of advanced CNG trucks are currently unclear. Further, more information is required regarding RNG production potential from California instate biofuel resources, including potential supply volumes and production pathways that provide maximum GHG reductions. The UC Irvine Advanced Power and Energy Program assessed the air quality and GHG implications of transitioning to advanced CNG engines in MDVs and HDVs in California by developing and comparing different future adoption scenarios. The research team also leveraged prior research of biogas and biomass resources in California to consider different options for producing RNG in-state. Key findings from this research are highlighted in the following section.
- Published
- 2017
5. Prevalence of Salmonella spp. and Escherichia coli O157 in a red deer herd (Cervus elaphus scoticus) in central Mexico
- Author
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Salas-Rosas, Luz María, López González, Carlos Alberto, Sánchez-Cervantes, Alejandra, Vázquez-Peláez, Carlos Gustavo, Rodríguez-Torres, Angelina, Cervantes-Chávez, José Antonio, and Olvera-Ramírez, Andrea M.
- Published
- 2020
- Full Text
- View/download PDF
6. The phase 1/2 trial of indomethacin in chronic pancreatitis (The PAIR trial): Protocol for a parallel multi-center randomized controlled trial
- Author
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Han, Samuel, primary, Conwell, Darwin L., additional, Li, Liang, additional, Cervantes, Alejandra, additional, Hart, Phil A., additional, Cruz-Monserrate, Zobeida, additional, Hao, Wenrui, additional, Lesinski, Gregory B., additional, Mace, Thomas, additional, Palermo, Tonya M., additional, Saloman, Jami L., additional, Yadav, Dhiraj, additional, Vege, Santhi Swaroop, additional, and Topazian, Mark, additional
- Published
- 2023
- Full Text
- View/download PDF
7. Air Quality and Greenhouse Gases Impacts Associated with Zero and Near-Zero Heavy-Duty Vehicles in California
- Author
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Cervantes, Alejandra
- Subjects
Mechanical engineering ,Environmental engineering ,air quality ,biogas ,California ,transportation - Abstract
California’s transportation and power generation sectors emit more than 50 percent of the state’s greenhouse gas (GHG) emissions. The state GHG emission mitigation goals include reducing GHG emissions to 1990 levels by 2020. Additionally, to improve air quality throughout the state, aggressive criteria pollutant emission standards have been established for both sectors. Transitioning from fossil fuels to renewable fuels is one strategy to meet these environmental goals. Landfills and wastewater treatment plants are a source for the production of alternative fuels like renewable natural gas (RNG) and hydrogen (H2) which could then be used in either sector. To evaluate this strategy, the impact on GHG and criteria pollutant emissions, and on air quality resulting from the production and use of RNG in zero or near-zero emission medium-duty vehicles (MDV) and heavy-duty vehicles (HDV) are analyzed. The research reveals that (1) RNG produced from biogas is the most cost effective strategy to utilize the limited resource of biogas available in California even though H2 is the most attractive fuel, (2) the transportation sector is the more effective sector for the use of RNG fuel, (3) MDV and HDV outfitted with commercially available near-zero emission CNG engines with RNG results in substantial reductions in both GHG and criteria pollutant emissions, and significantly improves air quality than the use of H2 in LDV, and (4) the reductions in GHG and criteria pollutant emissions and improvements in air quality exceed those achieved with the MDV and HDV populations envisioned by the State Implementation Plan (SIP).
- Published
- 2017
8. Vaginally use of iButton® loggers to measure body temperature in grazing red deer (Cervus elaphus).
- Author
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Álvarez Ramírez, Lorenzo, Arteaga Salazar, Gabriela, and Sánchez Cervantes, Alejandra
- Published
- 2023
- Full Text
- View/download PDF
9. Niveles de Confianza del Exceso de Mortalidad en los Estados Mexicanos en 2020
- Author
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Fuentes Flores, Noé Aarón, primary, González König, Gabriel, additional, Brugués Rodríguez, Alejandro, additional, and Ramirez Cervantes, Alejandra, additional
- Published
- 2022
- Full Text
- View/download PDF
10. CALIDAD DE LA ENERGÍA Y FUENTES DE ENERGÍA SUSTENTABLE EN LA RED ELÉCTRICA
- Author
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Arizpe Islas, Jorge Luis, Jiménez Mesa, Obed Renato, González Díaz, Lorena, and García Cervantes., Alejandra de Jesús
- Subjects
Sistemas Fotovoltaicos ,Energía Eléctrica ,Calidad de la Energía Eléctrica - Abstract
En este documento se presenta una revisión bibliográfica de los SFV además de mostrar algunos índices de acuerdo con la normatividad vigente, los cuales están relacionados con la calidad de energía utilizando FES. Así mismo se presenta un caso de estudio con el propósito de evaluar el efecto de estas sobre la potencia activa suministrada a la Red eléctrica en baja tensión y un segundo caso de estudio con el fin de analizar la magnitud de tensión eléctrica en el Punto de acoplamiento común. Se observa a menudo, que los niveles de tensión y corrientes eléctricas en la industria son distorsionados. Es interesante visualizar en este artículo como el flujo de potencia en la Red eléctrica se ve afectado por la aportación de potencia activa del sistema fotovoltaico de tal forma que esto puede ocasionar incremento en la capacidad de potencia de cortocircuito. En los casos que se presentan en el artículo se considera la Potencia y tensión eléctrica en el PAC considerando las FES.
- Published
- 2021
11. Benefits of near-zero freight: The air quality and health impacts of low-NOx compressed natural gas trucks
- Author
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Mac Kinnon, Michael, primary, Zhu, Shupeng, additional, Cervantes, Alejandra, additional, Dabdub, Donald, additional, and Samuelsen, G.S., additional
- Published
- 2021
- Full Text
- View/download PDF
12. Does royal jelly have a reproductive effect on progesterone-treated goats?/¿Tiene la jalea real un efecto reproductivo en cabras tratadas con progesterona?/A geleia real tem efeito reprodutivo em cabras tratadas com progesterona?
- Author
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Ramirez, Lorenzo Alvarez and Cervantes, Alejandra Sanchez
- Published
- 2018
- Full Text
- View/download PDF
13. Análisis del patrón espacio-temporal de transmisión del COVID-19 por municipios de Baja California
- Author
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Brugués Rodríguez, Alejandro, primary, Fuentes Flores, Noé Arón, additional, and Ramírez Cervantes, Alejandra, additional
- Published
- 2021
- Full Text
- View/download PDF
14. Análisis del patrón espacio-temporal de transmisión del COVID-19 por municipios de Baja California
- Author
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Brugués Rodríguez, Alejandro, Fuentes, Noé Arón, Ramírez Cervantes, Alejandra, Brugués Rodríguez, Alejandro, Fuentes, Noé Arón, and Ramírez Cervantes, Alejandra
- Abstract
The text analyzes the spatio-temporal pattern of spread of COVID-19 in the municipalities of Baja California from epidemiological week 10 to 31 based on System Dynamics (SD) and Geographic Information Systems (GIS) methodologies. The epidemic SIR model is used to model the critical factors of pandemic congestion —infection rate and infection recovery rate— with data from the General Directorate of Epidemiology of the Ministry of Health available on June 6, 2020. The epidemiological pattern tends to be spatially concentrated in Mexicali, Tijuana and Tecate, which are home to cross-border workers between the Californias. In addition, it presents a changing temporal dynamic towards the municipalities of Ensenada and Playas de Rosarito, which are the most demanded destinations by Californian tourist., El texto analiza del patrón espacio-temporal de propagación del COVID-19 en los municipios de Baja California desde la semana epidemiológica 10 hasta la 31 con base en las metodologías de Dinámica de Sistemas (DS) y Sistemas de Información Geográfica (SIG). Se usa el modelo susceptibles, infectados y recuperados (SIR) epidémico a fin de modelar los factores críticos de contagio de la pandemia —tasa de infección y tasa de recuperación de la infección— con datos de la Dirección General de Epidemiología de la Secretaría de Salud disponibles el día 6 de junio de 2020. El patrón epidemiológico tiende a concentrase espacialmente en Mexicali, Tijuana y Tecate, ciudades que albergan a los trabajadores transfronterizos entre las Californias. Además, presenta una dinámica temporal cambiante hacia los municipios de Ensenada y Playas de Rosarito que son el destino de mayor demanda de los turistas californianos.
- Published
- 2021
15. Tratamiento de aguas contaminadas con plomo (II) mediante una técnica en continuo de bioadsorción en columna de corcho
- Author
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Belaire Cervantes, Alejandra Catalina
- Subjects
Plomo (II) ,Bioabsorción en columna ,Columna de corcho ,Grado en Ciencias Ambientales-Grau en Ciències Ambientals ,Bioadsorción ,QUIMICA ANALITICA ,Biosorption of heavy metals ,Continuous techniqhe ,Lead (II) ,Cork column ,Técnica en continuo - Abstract
[ES] Actualmente, el agua es un recuso muy valorado y apreciado por las sociedades y por eso se quiere evitar su contaminación. Existen muchos tipos de contaminación, los cuales se pueden clasificar según su origen o tipo. El tipo de contaminación de origen artificial que se aborda en este trabajo es una contaminación por metales pesados. Los metales pesados son un grupo de elementos de la tabla periódico que comparten una serie de características en común, siendo las más destacable, su toxicidad (cambiando entre derivaciones del mismo elemento o su configuración electrónica), densidad, su movilidad en ambientes con pH ligeramente ácidos o su naturaleza metálica. El plomo (II) será el metal pesado estudiado en el proyecto. El plomo es un metal pesado cuya densidad es de 11,34 g/cm y se puede encontrar de manera natural en el medio. Este elemento químico es tóxico, denso y acumulativo, el cual afecta tanto a organismos vivos como seres humanos. Actualmente, existe normativa en materia de medioambiente de ámbito europeo,estatal y autonómico. En ámbito europeo se encuentra La Directiva 2000/60/CE del Parlamento Europeo y del Consejo, 23 de octubre de 2000. De ámbito estatal se encuentra el Real Decreto 60/2011, de 21 de enero, sobre las normas de calidad ambiental en el ámbito de la política de agua. Y, por último, de ámbito autonómico se encuentra el Decreto Legislativo 3/2003,de 4 de noviembre, ordena las competencias en materia de aguas para regular la organización y funcionamiento de la Administración hidráulica en Cataluña. Estas normativas han dado lugar al desarrollo y aplicación de tecnologías con la finalidad de tratar las aguas contaminadas. Existen muchas técnicas de tratamiento de aguas contaminadas con metales pesados como la precipitación, columnas de intercambio iónico, filtración. Debido a limitaciones técnicas o económicas se buscan nuevas tecnologías más baratascomo la bioadsorción. Ésta es una técnica de tratamiento de caudales contaminados a bajas concentraciones, que consigue retener este agente mediante el uso de materiales de origen biológico inerte. Para esta técnica existe una amplia gama de biomateriales a estudiar como el algodón, microalgas, cáscaras de café y corcho. El corcho (Quercus suber L.,) que se emplea como adsorbente, ha sufrido un proceso de triturado para obtener un tamaño de partícula pequeño (de entre 1-2 mm a 3-4 mm), y puede ser usado directamentesin ningún tipo de tratamiento. En este proyecto se ha estudiado el corcho como un material bioadsorbente para la eliminación de plomo (II) del agua. Para ello se ha realizado una técnica en continuo en columna a un caudal y concentración de entrada constantes. En esta técnica existen dos claras etapas, las cuales se estudiarán a lo largo del proyecto. Estas son la fase de extracción, donde se adsorbe el plomo (II) al corcho, y la fase de elución, donde se extrae el plomo adsorbido con ácido nítrico. De la fase de extracción se ha estudiado la influencia que tiene la compactación del corcho en la columna y la influencia del caudal de entrada sobre la adsorción del plomo (II) en el corcho, los cuales han demostrado ser factores a tener en cuenta en este tipo de técnicas. Se ha observado que es necesarios un mínimo grado de compactación para que los resultados sean reproducibles. También, se ha cuantificado la cantidad de biomaterial necesario y el tiempo de tratamiento del agua para poder visualizar toda la curva de saturación con su caudal correspondiente y concentración escogida, siendo esta masa de biomaterial 1 g. De la fase de elución se ha estudiado la eliminación de plomo (II) adsorbido en corcho mediante una elución de ácido nítrico a distintas concentraciones, obteniendo entre ambas experiencias diferencias no significativas. Por último, se ha estudiado el posible origen del deterioro del corcho a lo largo de su uso como bioadsorbente, [EN] Currently, water is a highly valued and appreciated by societies and that is why pollution is to be avoided. There are many types of pollution, which can be classified according to their origin or type. The type of contamination of artificial origin that is approached in this work, is a contamination by heavy metals. The heavy metals are a group of elements of the periodic table that share a series of characteristics in common, being the most remarkable, its toxicity (changing between derivations of the same element or its electronic configuration), density, its mobility in environments with slightly acid pH or their metallic nature. Lead (II) will be the heavy metal studied in the project. Lead is a heavy metal whose density is 11.34 g · cm-3 at 20oC and its atomic mass is 207.19 g · mol-1 and can be found in nature. This chemical element is toxic, dense and cumulative, which affects both, living organisms and humans. Currently, there are environmental regulations at European, state and regional level. At European level, there is the Directive 2000/60 / EC of the European Parliament and of the Council, of 23 October 2000. At State level there is the Royal Decree 60/2011 of 21 January on environmental quality standards in Area of water policy. And finally, at regional level there is the Legislative Decree 3/2003, of November 4, orders the water authority to regulate the organization and operation of the Water Authority in Catalonia. These regulations have led to the development and application of technologies to treat contaminated water. There are many techniques for treating water contaminated with heavy metals, such as precipitation, ion exchange columns, filtration. Due to technical or economic limitations, new cheaper technologies such as bioadsorption are being rehearsed. This is a technique of treatment of polluted water at low concentrations, which manages to retain pollutants through the use of materials of inert biological origin. For this technique there is a wide range of biomaterials to study such as cotton, microalgae, coffee husks and cork. The cork (Quercus suber L.), which is used as an adsorbent, has undergone a grinding process to obtain a small particle size (1-2 mm to 3-4 mm), and can be used directly without any type of treatment. In this project, cork has been studied as a bioadsorbent material for the removal of lead (II) from water. To do so, a continuous column technique has been performed at a constant flow rate and concentration. In this technique there are two clear stages, which will be studied throughout the project. These are the extraction phase, where the lead (II) is adsorbed to the cork, and the elution phase, where the lead adsorbed io the cork is extracted with nitric acid. From the extraction phase, we have studied the influence of cork compaction on the column and the influence of the input flow on the adsorption of lead (II) in the cork, which have been shown to be factors in this to take in consider for this techniques. It has been observed that a minimum degree of compaction of cork is necessary for the results to be reproducible. Also, the amount of biomaterial required and the treatment time of the water, have been quantified to be able to visualize the entire breaktrough curve with its corresponding flow and chosen concentration. This mass of biomaterial its 1 g. From the elution phase, the removal of lead (II) adsorbed in cork with two solutions of nitric acid at different concentrations has been studied, obtaining between both experiences non significant differences. Finally, the possible origin of the deterioration of the cork during its use as bioadsorbent has been studied. Cork has been shown to be a useful biomaterial for the treatment of water contaminated by lead (II).
- Published
- 2020
16. Tratamiento de aguas contaminadas con plomo (II) mediante una técnica en continuo de bioadsorción en columna de corcho
- Author
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Meseguer Lloret, Susana, Universitat Politècnica de València. Departamento de Química - Departament de Química, Universitat Politècnica de València. Escuela Politécnica Superior de Gandia - Escola Politècnica Superior de Gandia, Belaire Cervantes, Alejandra Catalina, Meseguer Lloret, Susana, Universitat Politècnica de València. Departamento de Química - Departament de Química, Universitat Politècnica de València. Escuela Politécnica Superior de Gandia - Escola Politècnica Superior de Gandia, and Belaire Cervantes, Alejandra Catalina
- Abstract
[ES] Actualmente, el agua es un recuso muy valorado y apreciado por las sociedades y por eso se quiere evitar su contaminación. Existen muchos tipos de contaminación, los cuales se pueden clasificar según su origen o tipo. El tipo de contaminación de origen artificial que se aborda en este trabajo es una contaminación por metales pesados. Los metales pesados son un grupo de elementos de la tabla periódico que comparten una serie de características en común, siendo las más destacable, su toxicidad (cambiando entre derivaciones del mismo elemento o su configuración electrónica), densidad, su movilidad en ambientes con pH ligeramente ácidos o su naturaleza metálica. El plomo (II) será el metal pesado estudiado en el proyecto. El plomo es un metal pesado cuya densidad es de 11,34 g/cm y se puede encontrar de manera natural en el medio. Este elemento químico es tóxico, denso y acumulativo, el cual afecta tanto a organismos vivos como seres humanos. Actualmente, existe normativa en materia de medioambiente de ámbito europeo,estatal y autonómico. En ámbito europeo se encuentra La Directiva 2000/60/CE del Parlamento Europeo y del Consejo, 23 de octubre de 2000. De ámbito estatal se encuentra el Real Decreto 60/2011, de 21 de enero, sobre las normas de calidad ambiental en el ámbito de la política de agua. Y, por último, de ámbito autonómico se encuentra el Decreto Legislativo 3/2003,de 4 de noviembre, ordena las competencias en materia de aguas para regular la organización y funcionamiento de la Administración hidráulica en Cataluña. Estas normativas han dado lugar al desarrollo y aplicación de tecnologías con la finalidad de tratar las aguas contaminadas. Existen muchas técnicas de tratamiento de aguas contaminadas con metales pesados como la precipitación, columnas de intercambio iónico, filtración. Debido a limitaciones técnicas o económicas se buscan nuevas tecnologías más baratascomo la bioadsorción. Ésta es una técnica de tratamiento de caudales contaminados a bajas c, [EN] Currently, water is a highly valued and appreciated by societies and that is why pollution is to be avoided. There are many types of pollution, which can be classified according to their origin or type. The type of contamination of artificial origin that is approached in this work, is a contamination by heavy metals. The heavy metals are a group of elements of the periodic table that share a series of characteristics in common, being the most remarkable, its toxicity (changing between derivations of the same element or its electronic configuration), density, its mobility in environments with slightly acid pH or their metallic nature. Lead (II) will be the heavy metal studied in the project. Lead is a heavy metal whose density is 11.34 g · cm-3 at 20oC and its atomic mass is 207.19 g · mol-1 and can be found in nature. This chemical element is toxic, dense and cumulative, which affects both, living organisms and humans. Currently, there are environmental regulations at European, state and regional level. At European level, there is the Directive 2000/60 / EC of the European Parliament and of the Council, of 23 October 2000. At State level there is the Royal Decree 60/2011 of 21 January on environmental quality standards in Area of water policy. And finally, at regional level there is the Legislative Decree 3/2003, of November 4, orders the water authority to regulate the organization and operation of the Water Authority in Catalonia. These regulations have led to the development and application of technologies to treat contaminated water. There are many techniques for treating water contaminated with heavy metals, such as precipitation, ion exchange columns, filtration. Due to technical or economic limitations, new cheaper technologies such as bioadsorption are being rehearsed. This is a technique of treatment of polluted water at low concentrations, which manages to retain pollutants through the use of materials of inert biological origin. For this technique th
- Published
- 2020
17. Curcumin Decreases the Oxidative Damage Indexes and Increases the Adiponectin Levels in Serum of Obese Subjects: 224
- Author
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Campos-Cervantes, Alejandra, Murillo-Ortiz, Blanca Olivia, Alvarado-Caudillo, Yolanda, Pérez-Vázquez, Victoriano, and Ramírez-Emiliano, Joel
- Published
- 2011
- Full Text
- View/download PDF
18. Curcumin Restores Levels of BDNF and GDNF and Decreases Oxidative Damage in Brain of db/db Diabetic Mice: 380
- Author
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Franco-Robles, Elena, Segovia, José, Campos-Cervantes, Alejandra, López-Briones, Sergio, Pérez-Vázquez, Victoriano, and Ramírez-Emiliano, Joel
- Published
- 2009
19. Benefits of near-zero freight: The air quality and health impacts of low-NOx compressed natural gas trucks.
- Author
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Mac Kinnon, Michael, Zhu, Shupeng, Cervantes, Alejandra, Dabdub, Donald, and Samuelsen, G.S.
- Subjects
AIR quality ,AIR freight ,ZERO emissions vehicles ,NATURAL gas ,COMPRESSED gas ,COMPRESSED natural gas - Abstract
The use of low-NOx compressed natural gas (CNG) medium-duty vehicles (MDVs) and heavy-duty vehicles (HDVs) has the potential to significantly reduce NO
x emissions and yield improvements in regional air quality. However, the extent of air quality improvement depends on many factors including future levels of vehicle deployment, the evolution of emissions from other sources, and meteorology. An analysis of the impacts requires modeling the atmosphere to account for both primary and secondary air pollutants, and the use of health impact assessment tools to map air quality changes into quantifiable metrics of human health. Here, we quantify and compare the air quality and health impacts associated with the deployment of low-NOx CNG engines to power future MDV and HDV fleets in California relative to both a business-as-usual and a more advanced fleet composition. The results project that reductions in summer ground-level ozone could reach 13 ppb when compared to a baseline fleet of diesel and gasoline HDV and MDV and could reach 6 ppb when compared to a cleaner fleet that includes some zero-emission vehicles and fuels. Similarly, for all CNG cases considered reductions in PM2.5 are predicted to range from 1.2 ug/m3 to 2.7 ug/m3 for a summer episode and from 3.1 ug/m3 to approximately 7.8 ug/m3 for a winter episode. These improvements yield short-term health benefits equivalent to $47 to $56 million in summer and $38 to $43 million in winter during episodes conducive to poor air quality. Additionally, the use of zero emission vehicle options such as battery electric and hydrogen fuel cell trucks could achieve approximately 25% to 31% higher benefits for an equivalent fleet penetration level due to the additional emission reductions achieved. Implications: The paper provides a quantitative estimate of the air quality and human health benefits that can be achieved through the use of novel compressed natural gas engines (i.e., low-NOx CNG) in medium- and heavy-duty vehicles and provide a comparison with zero emission vehicles. Thus, our findings will provide support for policy development seeking to transform the trucking sector to meet clean air and climate goals given the current struggle policymakers have with selecting between alternative truck technologies due to variance in factors like cost and technical maturity. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
20. Management of the postraumatic dental complication. A case report
- Author
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Peralta Cervantes, Alejandra and Curiel Torres, Sergio
- Subjects
stomatognathic diseases ,ferulización ,Dental trauma ,stomatognathic system ,diagnosis ,dental ,apicoformación ,apicoformation ,splinting ,diagnóstico - Abstract
Resumen Se presenta el caso clínico de una paciente femenina de 7 años de edad, la cual sufrió traumatismo dental en el central superior derecho permanente, al impactarse de manera directa en el pavimento al caer de una bicicleta. Se presenta necrosis pulpar como complicación postraumática a un mes de ocurrido el evento. El objetivo de este caso es mostrar que el diagnóstico adecuado y el conocimiento sobre un protocolo para el manejo del paciente con trauma dental son indispensables para el éxito del tratamiento y pronóstico del diente. Abstract The clinical case of a 7-year-old female patient who suffered dental trauma in the permanent upper right central incisor presented by directly impacting the pavement after falling from a bicycle. Pulpar necrosis is presented as a postraumatic complication one month after the event. The objective of this case is to show that the adequate diagnosis and knowledge about the protocol for the management of the patient with dental trauma is essential for the success of the treatment and prognosis of the tooth.
- Published
- 2019
21. Locally-Sourced Architecture
- Author
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Cervantes, Alejandra, Douma, Amy, Moore, Jim, Mans, Jacob, Cervantes, Alejandra, Douma, Amy, Moore, Jim, and Mans, Jacob
- Abstract
Architectural projects contribute to economic development through many channels, including the specifying of materials and building systems. As specification systems become more standardized, relying on familiar manufacturers or product lines, architects inadvertently contribute to concentrations of opportunity - and potentially resulting wealth - along established supply chain channels. With increased globalization of product manufacturers and supply chains, those who benefit from this system are frequently distant from the community in which the project resides. This research identifies an interdisciplinary process to help refocus the economic benefits of material choices through repositioning the design professional within the ecosystem of those decisions. This process leverages architectural services to enhance local economies through social and material capital. Developed through a national research consortium connecting academia and architectural practice, the research is led by a HGA Architects & Engineers and the University of Minnesota who teamed to explore these questions beginning in 201S. Preliminary outcomes of the research identified ways architecture projects could embed data-driven processes within an effective economic development strategy, in turn opening possibilities for architects to impart positive change in a project's local economy and improve their agency in the systems of material and social currency that enable local economic growth. Through this research a ‘locally-sourced' design process was developed in which embedding the data of local economic experts within the process of material and systems selections could maximize targeted impact, and architects would be able to track the benefits of these selections for ultimate sustainment. This research not only offers architects an opportunity for expanded architectural services, it also posits an equitable design and construction process with the potential to enhance client relationships
- Published
- 2019
22. Benefits of near-zero freight: The air quality and health impacts of low-NOxcompressed natural gas trucks
- Author
-
Mac Kinnon, Michael, Zhu, Shupeng, Cervantes, Alejandra, Dabdub, Donald, and Samuelsen, G.S.
- Abstract
ABSTRACTThe use of low-NOx compressed natural gas (CNG) medium-duty vehicles (MDVs) and heavy-duty vehicles (HDVs) has the potential to significantly reduce NOxemissions and yield improvements in regional air quality. However, the extent of air quality improvement depends on many factors including future levels of vehicle deployment, the evolution of emissions from other sources, and meteorology. An analysis of the impacts requires modeling the atmosphere to account for both primary and secondary air pollutants, and the use of health impact assessment tools to map air quality changes into quantifiable metrics of human health. Here, we quantify and compare the air quality and health impacts associated with the deployment of low-NOxCNG engines to power future MDV and HDV fleets in California relative to both a business-as-usual and a more advanced fleet composition. The results project that reductions in summer ground-level ozone could reach 13 ppb when compared to a baseline fleet of diesel and gasoline HDV and MDV and could reach 6 ppb when compared to a cleaner fleet that includes some zero-emission vehicles and fuels. Similarly, for all CNG cases considered reductions in PM2.5are predicted to range from 1.2 ug/m3to 2.7 ug/m3for a summer episode and from 3.1 ug/m3to approximately 7.8 ug/m3for a winter episode. These improvements yield short-term health benefits equivalent to $47 to $56 million in summer and $38 to $43 million in winter during episodes conducive to poor air quality. Additionally, the use of zero emission vehicle options such as battery electric and hydrogen fuel cell trucks could achieve approximately 25% to 31% higher benefits for an equivalent fleet penetration level due to the additional emission reductions achieved.Implications: The paper provides a quantitative estimate of the air quality and human health benefits that can be achieved through the use of novel compressed natural gas engines (i.e., low-NOxCNG) in medium- and heavy-duty vehicles and provide a comparison with zero emission vehicles. Thus, our findings will provide support for policy development seeking to transform the trucking sector to meet clean air and climate goals given the current struggle policymakers have with selecting between alternative truck technologies due to variance in factors like cost and technical maturity.
- Published
- 2021
- Full Text
- View/download PDF
23. Tratamiento de aguas contaminadas con plomo (II) mediante una técnica en continuo de bioadsorción en columna de corcho
- Author
-
Belaire Cervantes, Alejandra Catalina, Jacobs Fantassi, Benjamín, Universitat Autònoma de Barcelona. Facultat de Ciències, Hierro Gutiérrez, Almudena, López Mesas, Montserrat, Palet i Ballús, Cristina, and López-Mesas, Montserrat
- Subjects
Corcho ,Suro ,Plomo (II) ,Columna ,Técnica en continuo ,Bioadsorción ,Tècnica en continu ,Plom ,Bioadsorció - Abstract
En este proyecto se ha estudiado el corcho como un material bioadsorbente para la eliminación de plomo (II) del agua. Para ello se ha realizado una técnica en continuo en columna a un caudal y concentración de entrada constante. En esta técnica existen dos claras etapas, las cuales se estudiarán a lo largo del proyecto. Estas son la fase de extracción, donde se adsorbe el plomo (II) al corcho, y la fase de elución, donde se extrae el plomo adsorbido con ácido nítrico. De la fase de extracción se ha estudiado la influencia tiene la compactación del corcho en la columna y la influencia del caudal de entrada sobre la adsorción del plomo (II) en el corcho, los cuales han demostrado ser factores a tener en cuenta en este tipo de técnicas. Se ha observado que es necesario un mínimo grado de compactación para que los resultados sean reproducibles. También se ha cuantificado la cantidad de biomaterial necesario y el tiempo de tratamiento del agua para poder visualizar toda la curva de saturación con su caudal correspondiente y concentración escogida, siendo esta masa de biomaterial 1 g. Por último, de la fase de elución se ha estudiado la eliminación de plomo (II) adsorbido en corcho mediante una elución de ácido nítrico a distintas concentraciones, obteniendo entre ambas experiencias diferencias no significativas. Se ha demostrado que el corcho es un biomaterial útil para el tratamiento de aguas contaminadas por plomo (II).
- Published
- 2017
24. Physical activity by children: an analysis based on Social Network Theory
- Author
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Mota-Cervantes, Alejandra, González-González, Edgar Leonel, Henao-Morán, Santiago Andrés, Moreno-Saracho, Jessica E., and Rodríguez-Oliveros, Guadalupe
- Subjects
obesity ,red social ,social neworking ,children ,health promotion ,promoción de la salud ,Actividad física ,physical activity ,obesidad ,niños - Abstract
Introduction: Physical inactivity is a risk factor for obesity and non-transmissible chronic diseases; this represents a burden for health services and limits the development of social capital. Objective: To identify the structure of the school and the community social network for the practice of structured and unstructured physical activity (PA) by schoolchildren. Methods: Cross-sectional study based on Social Network Theory conducted in Morelos, Mexico. A convenience sample of 33 children aged 8 to 10 years-old was selected from two public elementary schools. PA evaluations through pedometry, anthropometric assessments, and PA social network assessments (size, density, homophily, and centrality of actors) were performed. Results: The overall PA network was composed by 239 actors that were mostly peers (40.2%). The school sub-network had an average of 122 actors (87.0% children/peers and 13.0% teachers). Most children conducted PA in groups with their peers; overweight/obese children (mostly girls) lingered in the periphery of the school sub-network. The community sub-network had an average of 160 actors (55.0% parents/family members, 41.2% children/peers, and 3.8% Soccer-coaches). This sub-network, composed mostly by men (60.6%), was highly fragmented (19 sets of actors); they generally promoted unstructured "masculine" activities. The girls who did not perform structured PA and did not meet the recommended number of steps/day were in isolated and small community networks. Conclusions: School teachers are key actors in promoting structured PA. Male peers stand out as promoters of unstructured activity in the school and the community. Overweight and obese girls are a vulnerable group by having fragmented social networks. Public health interventions based in social networks should empower girls motor activity and adult women to become prestige leaders for promoting PA among children. Introducción: La inactividad física es factor de riesgo para desarrollar enfermedades crónicas no transmisibles como la obesidad, limitando el desarrollo del capital social. Objetivo: Identificar la estructura de las redes sociales escolar y comunitaria para la práctica de la actividad física (AF) en escolares. Metodología: Estudio transversal basado en la Teoría de redes sociales, realizado en escuelas primarias públicas de Morelos, México, en 33 niños de 8 a 10 años de edad. Se realizaron mediciones de AF estructurada y no estructurada mediante podometría, evaluaciones antropométricas y de la estructura de las redes sociales de los escolares (tamaño, densidad, homofilia, y centralidad). Resultados: La red general incluyó 239 actores, la mayoría (40.2%) pares de los escolares. La sub-red escolar incluyó 122 actores, 87.0% escolares/pares y 13.0% maestros. Las niñas con sobrepeso/obesidad se ubicaron en la periferia de la sub-red; la mayoría de los escolares realizaron AF grupal con sus pares. La sub-red comunitaria incluyó 160 actores (55.0% padres/otros familiares, 41.2% escolares/pares y 3.8% entrenadores de futbol). Esta sub-red estuvo altamente fragmentada (19 conjuntos de actores), con 60.6% hombres promotores de actividades no estructuradas "masculinas". Las niñas sedentarias y que no realizaban AF estructurada formaron redes pequeñas y aisladas. Conclusión: Los maestros y pares de sexo masculino son actores clave en la promoción de AF en la escuela y la comunidad. Las niñas con sobrepeso/obesidad son un grupo vulnerable al tener redes fragmentadas. Intervenciones de salud pública basadas en redes sociales, deben empoderar a niñas y mujeres para convertirse en líderes promotoras de AF en escolares.
- Published
- 2016
25. Tratamiento de aguas contaminadas con plomo (II) mediante una técnica en continuo de bioadsorción en columna de corcho
- Author
-
Hierro Gutiérrez, Almudena, López Mesas, Montserrat, Palet i Ballús, Cristina, Belaire Cervantes, Alejandra Catalina, Jacobs Fantassi, Benjamín, Universitat Autònoma de Barcelona. Facultat de Ciències, Hierro Gutiérrez, Almudena, López Mesas, Montserrat, Palet i Ballús, Cristina, Belaire Cervantes, Alejandra Catalina, Jacobs Fantassi, Benjamín, and Universitat Autònoma de Barcelona. Facultat de Ciències
- Abstract
En este proyecto se ha estudiado el corcho como un material bioadsorbente para la eliminación de plomo (II) del agua. Para ello se ha realizado una técnica en continuo en columna a un caudal y concentración de entrada constante. En esta técnica existen dos claras etapas, las cuales se estudiarán a lo largo del proyecto. Estas son la fase de extracción, donde se adsorbe el plomo (II) al corcho, y la fase de elución, donde se extrae el plomo adsorbido con ácido nítrico. De la fase de extracción se ha estudiado la influencia tiene la compactación del corcho en la columna y la influencia del caudal de entrada sobre la adsorción del plomo (II) en el corcho, los cuales han demostrado ser factores a tener en cuenta en este tipo de técnicas. Se ha observado que es necesario un mínimo grado de compactación para que los resultados sean reproducibles. También se ha cuantificado la cantidad de biomaterial necesario y el tiempo de tratamiento del agua para poder visualizar toda la curva de saturación con su caudal correspondiente y concentración escogida, siendo esta masa de biomaterial 1 g. Por último, de la fase de elución se ha estudiado la eliminación de plomo (II) adsorbido en corcho mediante una elución de ácido nítrico a distintas concentraciones, obteniendo entre ambas experiencias diferencias no significativas. Se ha demostrado que el corcho es un biomaterial útil para el tratamiento de aguas contaminadas por plomo (II).
- Published
- 2017
26. contemporáneo59Incorporación del peritaje social desde el análisis de género a los procedimientos en materia familiar, interacciones de un trabajo social contemporáneo
- Author
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Casas Cervantes, Alejandra, primary and Niño Zúñiga, Mayra Guadalupe, additional
- Published
- 2017
- Full Text
- View/download PDF
27. Manejo de complicación postraumática dental. Informe de caso.
- Author
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Peralta Cervantes, Alejandra and Curiel Torres, Sergio
- Abstract
Copyright of Revista Odontología Vital is the property of Universidad Latina de Costa Rica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
- Full Text
- View/download PDF
28. Informe de un brote de fiebre catarral maligna asociada con herpesvirus ovino tipo 2 en rumiantes domésticos del altiplano mexicano.
- Author
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Pérez Guiot, Alfredo, Páez Trejo, Allan Arturo, Carranza Velázquez, José Alfredo, Sánchez Cervantes, Alejandra, Rodríguez García, Juan Antonio, Domínguez Hernández, Yesmín María, Basurto Camberos, Héctor, Yabuta Osorio, Adolfo Kunio, Hernández García, Diana Laura, Ruíz Olvera, Maximiliano, González Mendoza, Jorge Luis, and Candanosa Aranda, Irma Eugenia
- Abstract
Copyright of Revista Acadêmica: Ciência Animal is the property of Revista Academica: Ciencia Animal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
29. Physical activity by children: an analysis based on Social Network Theory
- Author
-
Mota Cervantes, Alejandra, González González, Edgar Leonel, Henao Morán, Santiago, Moreno Saracho, Jessica E., Rodríguez Oliveros, Guadalupe, Mota Cervantes, Alejandra, González González, Edgar Leonel, Henao Morán, Santiago, Moreno Saracho, Jessica E., and Rodríguez Oliveros, Guadalupe
- Abstract
Introduction: Physical inactivity is a risk factor for obesity and non-transmissible chronic diseases; this represents a burden for health services and limits the development of social capital. Objective: To identify the structure of the school and the community social network for the practice of structured and unstructured physical activity (PA) by schoolchildren. Methods: Cross-sectional study based on Social Network Theory conducted in Morelos, Mexico. A convenience sample of 33 children aged 8 to 10 years-old was selected from two public elementary schools. PA evaluations through pedometry, anthropometric assessments, and PA social network assessments (size, density, homophily, and centrality of actors) were performed. Results: The overall PA network was composed by 239 actors that were mostly peers (40.2%). The school sub-network had an average of 122 actors (87.0% children/peers and 13.0% teachers). Most children conducted PA in groups with their peers; overweight/obese children (mostly girls) lingered in the periphery of the school sub-network. The community sub-network had an average of 160 actors (55.0% parents/family members, 41.2% children/peers, and 3.8% Soccer-coaches). This sub-network, composed mostly by men (60.6%), was highly fragmented (19 sets of actors); they generally promoted unstructured “masculine” activities. The girls who did not perform structured PA and did not meet the recommended number of steps/day were in isolated and small community networks. Conclusions: School teachers are key actors in promoting structured PA. Male peers stand out as promoters of unstructured activity in the school and the community. Overweight and obese girls are a vulnerable group by having fragmented social networks. Public health interventions based in social networks should empower girls motor activity and adult women to become prestige leaders for promoting PA among children., Introducción: La inactividad física es factor de riesgo para desarrollar enfermedades crónicas no transmisibles como la obesidad, limitando el desarrollo del capital social. Objetivo: Identificar la estructura de las redes sociales escolar y comunitaria para la práctica de la actividad física (AF) en escolares. Métodología: Estudio transversal basado en la Teoría de redes sociales, realizado en escuelas primarias públicas de Morelos, México, en 33 niños de 8 a 10 años de edad. Se realizaron mediciones de AF estructurada y no estructurada mediante podometría, evaluaciones antropométricas y de la estructura de las redes sociales de los escolares (tamaño, densidad, homofilia, y centralidad). Resultados: La red general incluyó 239 actores, la mayoría (40.2%) pares de los escolares. La sub-red escolar incluyó 122 actores, 87.0% escolares/pares y 13.0% maestros. Las niñas con sobrepeso/obesidad se ubicaron en la periferia de la sub-red; la mayoría de los escolares realizaron AF grupal con sus pares. La sub-red comunitaria incluyó 160 actores (55.0% padres/otros familiares, 41.2% escolares/pares y 3.8% entrenadores de futbol). Esta sub-red estuvo altamente fragmentada (19 conjuntos de actores), con 60.6% hombres promotores de actividades no estructuradas “masculinas”. Las niñas sedentarias y que no realizaban AF estructurada formaron redes pequeñas y aisladas. Conclusiones: Los maestros y pares de sexo masculino son actores clave en la promoción de AF en la escuela y la comunidad. Las niñas con sobrepeso/obesidad son un grupo vulnerable al tener redes fragmentadas. Intervenciones de salud pública basadas en redes sociales, deben empoderar a niñas y mujeres para convertirse en líderes promotoras de AF en escolares.
- Published
- 2016
30. Condición jurídica del extranjero en México
- Author
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Valdovinos Cervantes, Alejandra and Campus Guadalajara
- Subjects
CIENCIAS SOCIALES - Abstract
La presente tesis tiene la pretensión de proponer opciones a problemas derivados por la insuficiente legislación y reglamentación, tal es el caso de la Ley General de Población, que por años ha sido intocada, así como su Reglamento, entre otras. Los Tratados Internacionales celebrados y ratificados por México, aportan una serie de elementos a considerar en relación a extranjeros. La Ley de Inversión Extranjera y su Reglamento, crean complejidades prácticas, traducidas en múltiples requisitos a cumplimentar por los extranjeros, quienes a fin de esquivarlas, optan por opciones traducidas en prestanombres o apoyo en socios mexicanos, entre otros aspectos, lo cual crea inseguridad jurídica.
- Published
- 2008
31. Effects of curcumin on brain-derived neurotrophic factor levels and oxidative damage in obesity and diabetes
- Author
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Franco-Robles, Elena, primary, Campos-Cervantes, Alejandra, additional, Murillo-Ortiz, Blanca O., additional, Segovia, José, additional, López-Briones, Sergio, additional, Vergara, Paula, additional, Pérez-Vázquez, Victoriano, additional, Solís-Ortiz, Martha S., additional, and Ramírez-Emiliano, Joel, additional
- Published
- 2014
- Full Text
- View/download PDF
32. Curcumin decreases oxidative stress in mitochondria isolated from liver and kidneys of high-fat diet-induced obese mice
- Author
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Martínez-Morúa, Antonia, primary, Soto-Urquieta, María G., additional, Franco-Robles, Elena, additional, Zúñiga-Trujillo, Ismael, additional, Campos-Cervantes, Alejandra, additional, Pérez-Vázquez, Victoriano, additional, and Ramírez-Emiliano, Joel, additional
- Published
- 2013
- Full Text
- View/download PDF
33. Evaluación de desempeño del glucómetro GLUCOCARD™ 01.
- Author
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Ramírez-Fernández, Norma A., Pacheco-Cervantes, Alejandra, and Lira-Reyes, Ana R.
- Abstract
Introduction: Capillary blood glucose is the recommended method for the self monitoring of glucose in order to ensure the right insulin therapy, for that reason is important use a reliable measurement method. Objective: To verify the lineality and precision of the GLUCOCARDTM 01 meter and its correlation with an standard laboratory method. Method: The metodology we used is based in the CENAM/ EMA guide and the manufacturer recomendations. For the statistical analysis we calculated correlation for lineality, coeficiente of variation (CV) and % bias. The system accuracy was determined based on ISO 15197:2003 recommendations. Results: For lineality r = 0.9991, precision: CV < 5% in the four samples tested. About comparison between total blood analyzed in glucometer with serum in standard method r=0.9788, for total blood with heparin compared with serum in the standard method r= 0.9775. Referent to accuracy and based on ISO 15197:2003, we observed that more than 95% of the results gotten, fall into the group with a difference smaller or equal to 20% compared to the standard method. Conclusions: GLUCOCARDTM 01 is a lineal, accurate and precise method in accordance with international standars and can be used as a reliable self monitoring blood glucose device. [ABSTRACT FROM AUTHOR]
- Published
- 2016
34. Activity Coefficients at Infinite Dilution and Critical Micelle Concentrations of Poly(oxy-1,2-ethanedyil), α-Tridecyl-ω-hydroxy Ethers (C13Ei=6,10,18) in Aqueous Media by the Volmer Surface Equation of State and Group Contributions
- Author
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Pardo-Cervantes, Alejandra, primary, Viades-Trejo, Josefina, additional, and Gracia-Fadrique, Jesús, additional
- Published
- 2011
- Full Text
- View/download PDF
35. Efectos ambientales y parámetros genéticos de variables de crecimiento para un rebaño de ciervo rojo (Cervus elaphus) en cautiverio.
- Author
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Ramírez-Valverde, Rodolfo, Sánchez-Cervantes, Alejandra, García-Muñiz, José G., Núñez-Domínguez, Rafael, and Lemus-Ramírez, Vicente
- Subjects
- *
RED deer , *HERITABILITY , *ANIMAL genetics , *GRASS-legume pastures , *ANIMAL models in research , *STANDARD deviations - Abstract
The objective was to estimate environmental effects and genetic parameters on growth traits in a flock of farmed red deer of the central Mexican highland. Animals were raised on an intensive rotational grazing system of grass-legume mixed temperate pastures. Evaluated traits were birth (BW), weaning adjusted to 100 d (WW) and yearling (YW) weights. Analyses were performed using the MTDFREML program. Final univariate animal models considered the fixed effect of sex-year, and calving age as a covariate for BW and WW, and the random direct (BW, WW and YW) and maternal (WW) genetic effects. Means and standard deviations for BW, WW and YW were 8.7±1.2, 42.4±5.6 and 80.8±13.3 kg. Males were higher (P<0.05) than those of females (4.6, 9.9 and 21.9 %, for BW, WW and YW). There were differences between contemporary groups for all traits (P<0.05). The linear effect of hind calving age was important (P<0.05) for both BW and WW. Estimates of direct heritability were 0.00±0.08, 0.41±0.33 and 0.17±0.15 for BW, WW and YW. Maternal heritability of WW was 0.22±0.16. Based on the estimated genetic additive variability of WW and YW in this herd, the results suggest the possibility for genetic improvement of those traits through selection; however, these results are not definitive given the limited quantity and quality of the used information. [ABSTRACT FROM AUTHOR]
- Published
- 2011
36. Vulvovaginitis y balanopostitis pustular sugerente a herpesvirus caprino-1 en cabras (Querétaro, México).
- Author
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Aranda, Irma Eugenia Candanosa, García, Mayra Sierra, Cervantes, Alejandra Sánchez, Garrido, Gerardo Salas, Bernal, Adriana Méndez, Marín, Laura Cobos, and Ramírez, Lorenzo Álvarez
- Subjects
VULVOVAGINITIS ,PENIS diseases ,HERPESVIRUS diseases in animals ,GOAT diseases ,RESPIRATORY diseases ,IMMUNOHISTOCHEMISTRY ,CYTOLOGY - Abstract
Copyright of Veterinaria México is the property of Facultad de Medicina Veterinaria y Zootecnia UNAM and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2011
37. Pustular vulvovaginitis and balanoposthitis suggestive of caprine herpesvirus-1 infection in goats (Queretaro, Mexico).
- Author
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Aranda, Irma Eugenia Candanosa, García, Mayra Sierra, Cervantes, Alejandra Sánchez, Garrido, Gerardo Salas, Bernal, Adriana Méndez, Marín, Laura Cobos, and Ramírez, Lorenzo Álvarez
- Subjects
VULVOVAGINITIS ,PENIS diseases ,HERPESVIRUS diseases in animals ,GOAT diseases ,RESPIRATORY diseases ,IMMUNOHISTOCHEMISTRY ,CYTOLOGY - Abstract
Infectious pustular vulvovaginitis and balanoposthitis in goats is caused by caprine herpesvirus 1 (CpHV-1), from the Herpesviridae family Alphaherpesvirinae subfamily, sometimes produces abortion, neonatal enteritis and respiratory disease in adult goats. In a herd of 244 dairy and meat goats, physical examinations were performed in does and bucks, presenting vulvar and preputial lesions. Necropsies were done in four discarded animals (one male and two females) and one stillborn; immunohistochemistry (IHC) with bovine herpesvirus 1 (BHV-1) antibodies in prepuce and vulva samples was carried out. Penis and prepuce exfoliative cytology was carried out in six bucks. Prepuce biopsies were collected for electron microscopy and viral isolation. Macroscopically, moderate to severe coalescent multifocal pustular and ulcerative vulvovaginitis was observed; and severe coalescent multifocal pustular and ulcerative balanoposthitis. Microscopically, different degrees of inflammatory lesions with presence of eosinophilic and amphophilic intranuclear inclusion bodies were present. In electron microscopy, the prepuce samples and MBDK cell culture showed several intranuclear viral particles of 150 to 230 nm size. There was slight epithelial cell positivity in IHC with BHV-1 antibodies in vulva and prepuce histological cuts made at necropsy. In the viral isolate was observed a cytopathic effect and the presence of viral particles by microscopy electronic suggesting herpes virus. This is the first documented report suggesting the presence of herpes virus outbreak in caprine herds in Mexico. [ABSTRACT FROM AUTHOR]
- Published
- 2011
38. Evaluation of the Air Quality and Greenhouse Gas Benefits of an Advanced Low-NOx Compressed Natural Gas (CNG) Engine in Medium and Heavy-Duty Vehicles in California
- Author
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State of California, University of California Institute of Transportation Studies, MacKinnon, Michael, Shaffer, Brendan, Cervantes, Alejandra, Samuelsen, Scott, University of California, Irvine. Institute of Transportation Studies, State of California, University of California Institute of Transportation Studies, MacKinnon, Michael, Shaffer, Brendan, Cervantes, Alejandra, Samuelsen, Scott, and University of California, Irvine. Institute of Transportation Studies
- Abstract
UC-ITS-2017-35, The goal of this research is to assess the greenhouse gas (GHG) emissions and air quality (AQ) impacts of transitions to advanced low‐NOx Compressed Natural Gas (CNG) engines in medium-duty vehicle (MDV) and heavy-duty vehicle (HDV) applications in California with a particular emphasis on renewable natural gas (RNG) as a fueling pathway. To evaluate regional AQ impacts in 2035, pollutant emissions from all end-use sectors are projected from current levels and spatially and temporally resolved. Scenarios are constructed beginning with both a conservative (Base Case) and more optimistic (SIP) case regarding advanced vehicle technology and fuels integration to provide spanning of potential impacts. To capture the impact of seasonal dynamics on pollutant formation and fate, two modeling periods are conducted including a winter and summer episode. To estimate the potential GHG impacts of transitions to advanced CNG engines in HDV and MDV, scenarios are evaluated under various assumptions regarding fuel pathways to meet CNG demand from a life cycle perspective. Scenarios are compared to the baseline cases assuming (1) all CNG is provided from conventional fossil natural gas and (2) under a range of possible resource availabilities associated with RNG and renewable synthetic natural gas (RSNG) from in-state resources. Key findings include: i) expanding the deployment of advanced CNG MDV and HDV can reduce summer ground-level ozone concentrations and ground-level PM2.5 in key regions of California; ii) the largest AQ benefits are associated with reducing emissions from HDV; iii) in-state RNG pathways can meet the CNG demand estimated for both baseline cases; iv) in-state resources are unable to entirely meet CNG demand for the high total CNG demand estimated for the majority of Base alternative cases, and v) advanced CNG HDV and MDV can moderately reduce GHG emissions if fossil natural gas is used (14 to 26%).
39. Work in Progress: Impact on Students Dropout rates of Introducing a First-Year Hands-on Civil Engineering Course
- Author
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CERVANTES, ALEJANDRA, primary and Guerra, Miguel Andres, additional
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- View/download PDF
40. RUTA NY-NIÁGARA.
- Author
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Cervantes, Alejandra
- Published
- 2017
41. Analysis of the spatio-temporal transmission pattern of COVID-19 by municipalities of Baja California.
- Author
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Brugués Rodríguez, Alejandro, Fuentes Flores, Noé Arón, and Ramírez Cervantes, Alejandra
- Subjects
- *
COVID-19 pandemic , *INFECTIOUS disease transmission - Abstract
The text analyzes the spatio-temporal pattern of spread of COVID-19 in the municipalities of Baja California from epidemiological week 10 to 31 based on System Dynamics (sd) and Geographic Information Systems (gis) methodologies. The epidemic sir model is used to model the critical factors of pandemic congestion -infection rate and infection recovery rate-with data from the General Directorate of Epidemiology of the Ministry of Health available on June 6, 2020. The epidemiological pattern tends to be spatially concentrated in Mexicali, Tijuana and Tecate, which are home to cross-border workers between Baja California and California. In addition, it presents a changing temporal dynamic towards the municipalities of Ensenada and Playas de Rosarito, which are the most demanded destinations by Californian tourist. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
42. Benefits of near-zero freight: The air quality and health impacts of low-NO x compressed natural gas trucks.
- Author
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Mac Kinnon M, Zhu S, Cervantes A, Dabdub D, and Samuelsen GS
- Subjects
- Environmental Monitoring, Gasoline analysis, Humans, Motor Vehicles, Natural Gas analysis, Vehicle Emissions analysis, Air Pollutants analysis, Air Pollution analysis, Air Pollution prevention & control
- Abstract
The use of low-NOx compressed natural gas (CNG) medium-duty vehicles (MDVs) and heavy-duty vehicles (HDVs) has the potential to significantly reduce NO
x emissions and yield improvements in regional air quality. However, the extent of air quality improvement depends on many factors including future levels of vehicle deployment, the evolution of emissions from other sources, and meteorology. An analysis of the impacts requires modeling the atmosphere to account for both primary and secondary air pollutants, and the use of health impact assessment tools to map air quality changes into quantifiable metrics of human health. Here, we quantify and compare the air quality and health impacts associated with the deployment of low-NOx CNG engines to power future MDV and HDV fleets in California relative to both a business-as-usual and a more advanced fleet composition. The results project that reductions in summer ground-level ozone could reach 13 ppb when compared to a baseline fleet of diesel and gasoline HDV and MDV and could reach 6 ppb when compared to a cleaner fleet that includes some zero-emission vehicles and fuels. Similarly, for all CNG cases considered reductions in PM2.5 are predicted to range from 1.2 ug/m3 to 2.7 ug/m3 for a summer episode and from 3.1 ug/m3 to approximately 7.8 ug/m3 for a winter episode. These improvements yield short-term health benefits equivalent to $47 to $56 million in summer and $38 to $43 million in winter during episodes conducive to poor air quality. Additionally, the use of zero emission vehicle options such as battery electric and hydrogen fuel cell trucks could achieve approximately 25% to 31% higher benefits for an equivalent fleet penetration level due to the additional emission reductions achieved. Implications : The paper provides a quantitative estimate of the air quality and human health benefits that can be achieved through the use of novel compressed natural gas engines (i.e., low-NOx CNG) in medium- and heavy-duty vehicles and provide a comparison with zero emission vehicles. Thus, our findings will provide support for policy development seeking to transform the trucking sector to meet clean air and climate goals given the current struggle policymakers have with selecting between alternative truck technologies due to variance in factors like cost and technical maturity.- Published
- 2021
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