The present study focuses mainly on knowing the current status of wetlands in the context of carbon sequestration in Mexican soils, for a good attention, management and dissemination of these ecosystems, without neglecting the importance it represents at local, regional and national levels before this environmental crisis and the eco-systemic services that wetlands provide, both social and environmental, since most of the studies on C sequestration and GHG emission have been conducted in temperate zones. In this review study, emphasis is placed on coastal, lacustrine or riparian wetlands, which are currently in a state of conservation risk due to various anthropogenic activities, for example, cattle ranching and agriculture (Marín-Muñiz, 2013).
{"title":"Carbon storage in Mexican wetland soils","authors":"José Enrique López-Alba, J. L. Marín-Muñíz","doi":"10.56845/rebs.v2i1.15","DOIUrl":"https://doi.org/10.56845/rebs.v2i1.15","url":null,"abstract":"The present study focuses mainly on knowing the current status of wetlands in the context of carbon sequestration in Mexican soils, for a good attention, management and dissemination of these ecosystems, without neglecting the importance it represents at local, regional and national levels before this environmental crisis and the eco-systemic services that wetlands provide, both social and environmental, since most of the studies on C sequestration and GHG emission have been conducted in temperate zones. In this review study, emphasis is placed on coastal, lacustrine or riparian wetlands, which are currently in a state of conservation risk due to various anthropogenic activities, for example, cattle ranching and agriculture (Marín-Muñiz, 2013).","PeriodicalId":194964,"journal":{"name":"Renewable Energy, Biomass & Sustainability","volume":"383 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123223089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Arvizu-Hernández, J. Caballero-Pérez, George H. Jones, J. Campos-Guillén
In its natural habitat, the soil bacterium Bacillus subtilis is exposed to fluctuating environmental conditions, mainly osmotic stress and nutrient deficiency stress (Marles-Wright and Lewis, 2007; Schultz et al., 2007). When nutrients are depleted, this bacterium generates spores that germinate to form vegetative cells when nutrients become available again in the medium (Bremer, 2002). In this regard, the molecular mechanisms of tRNA accumulation during sporulation are a priority, as they play an essential role in translation during spore germination and its subsequent growth phase (Keijser et al., 2007). The effects of salt stress on gene expression have been previously analyzed during germination and growth. However, the processing of tRNAs under these conditions has not been extensively studied. In this study we investigated the profile of tRNACys in B. subtilis spores and growth in the absence/presence of 1.2M NaCl.
在其自然栖息地，土壤细菌枯草芽孢杆菌暴露于波动的环境条件下，主要是渗透胁迫和营养缺乏胁迫(Marles-Wright and Lewis, 2007;Schultz et al.， 2007)。当营养物质耗尽时，这种细菌产生孢子，当营养物质在培养基中再次可用时，孢子萌发形成营养细胞(Bremer, 2002)。在这方面，tRNA在孢子形成过程中积累的分子机制是一个优先考虑的问题，因为它们在孢子萌发及其随后的生长阶段的翻译中起着至关重要的作用(Keijser et al.， 2007)。盐胁迫对种子萌发和生长过程中基因表达的影响已经被分析过。然而，在这些条件下trna的加工尚未得到广泛的研究。在本研究中，我们研究了tRNACys在枯草芽孢杆菌孢子中的分布，以及在120 m NaCl缺席和存在下的生长情况。
{"title":"Evaluation of the effect of salinity on tRNACys processing during Bacillus subtilis spore germination using RNA-seq","authors":"I. Arvizu-Hernández, J. Caballero-Pérez, George H. Jones, J. Campos-Guillén","doi":"10.56845/rebs.v2i1.13","DOIUrl":"https://doi.org/10.56845/rebs.v2i1.13","url":null,"abstract":"In its natural habitat, the soil bacterium Bacillus subtilis is exposed to fluctuating environmental conditions, mainly osmotic stress and nutrient deficiency stress (Marles-Wright and Lewis, 2007; Schultz et al., 2007). When nutrients are depleted, this bacterium generates spores that germinate to form vegetative cells when nutrients become available again in the medium (Bremer, 2002). In this regard, the molecular mechanisms of tRNA accumulation during sporulation are a priority, as they play an essential role in translation during spore germination and its subsequent growth phase (Keijser et al., 2007). The effects of salt stress on gene expression have been previously analyzed during germination and growth. However, the processing of tRNAs under these conditions has not been extensively studied. In this study we investigated the profile of tRNACys in B. subtilis spores and growth in the absence/presence of 1.2M NaCl.","PeriodicalId":194964,"journal":{"name":"Renewable Energy, Biomass & Sustainability","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133831734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This document aims to publicize the temperature evaluation carried out in the production area of a bakery in the city of Misantla, said evaluation was carried out to know the temperatures to which the workers in this space are exposed during their working hours, as well as, to determine if the temperatures are within the permissible limits as established in NOM-015-STP-200. The methodology comprised recognition, evaluation, and control of elevated temperature conditions within the bakery. This study is descriptive and is developed as a quantitative investigation. The research population is made up of exposed workers in the bakery. The temperature evaluation was carried out according to the procedure established in point No. 9 of the standard, taking the temperatures with the help of a prototype measuring temperature and relative humidity (prepared at the Higher Technological Institute of Misantla) and a anemometer, obtaining a temperature index of 40.7 ° C, and given this result it has been concluded that the temperature index exceeds the Maximum Permissible Limits of exposure to high temperatures established by the standard, which becomes a threat for the health of Occupationally Exposed Personnel (POE).
{"title":"Study of high temperature conditions in Misantla bakery","authors":"Ana Roselyn Pérez-Méndez, Romeo García-Cruz","doi":"10.56845/rebs.v1i1.12","DOIUrl":"https://doi.org/10.56845/rebs.v1i1.12","url":null,"abstract":"This document aims to publicize the temperature evaluation carried out in the production area of a bakery in the city of Misantla, said evaluation was carried out to know the temperatures to which the workers in this space are exposed during their working hours, as well as, to determine if the temperatures are within the permissible limits as established in NOM-015-STP-200. The methodology comprised recognition, evaluation, and control of elevated temperature conditions within the bakery. This study is descriptive and is developed as a quantitative investigation. The research population is made up of exposed workers in the bakery. The temperature evaluation was carried out according to the procedure established in point No. 9 of the standard, taking the temperatures with the help of a prototype measuring temperature and relative humidity (prepared at the Higher Technological Institute of Misantla) and a anemometer, obtaining a temperature index of 40.7 ° C, and given this result it has been concluded that the temperature index exceeds the Maximum Permissible Limits of exposure to high temperatures established by the standard, which becomes a threat for the health of Occupationally Exposed Personnel (POE).","PeriodicalId":194964,"journal":{"name":"Renewable Energy, Biomass & Sustainability","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127961187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Hernández-Vasquez, N. A. Vallejo-Cantú, A. Alvarado-Lassman, Sergio Reyes-Rosas
The citrus industry produces a considerable amount of solid and liquid waste, which are mostly wasted. Anaerobic digestion of sewage sludge is an attractive option as it can produce fuels in the form of methane gas. However, the presence of complex organic compounds and pathogenic microorganisms significantly hinders the effectiveness of this process. The objective of this work is the selection of a source of inoculum free of pathogenic microorganisms by means of a thermal pretreatment and in this way is conducive to the treatment of residual sludge from the Citrus industry. The inoculum was taken from a geomembrane reactor which uses cattle manure as a substrate. 6 biodegradability kinetics were performed, varying the substrate-inoculum ratio, three of them with inoculum without pretreatment and another three with treatment, all under mesophilic conditions. SV parameters, pH, and biogas production were determined.
{"title":"Evaluation of the biodegradability of a heat-treated anaerobic inoculum","authors":"L. Hernández-Vasquez, N. A. Vallejo-Cantú, A. Alvarado-Lassman, Sergio Reyes-Rosas","doi":"10.56845/rebs.v1i1.9","DOIUrl":"https://doi.org/10.56845/rebs.v1i1.9","url":null,"abstract":"The citrus industry produces a considerable amount of solid and liquid waste, which are mostly wasted. Anaerobic digestion of sewage sludge is an attractive option as it can produce fuels in the form of methane gas. However, the presence of complex organic compounds and pathogenic microorganisms significantly hinders the effectiveness of this process. The objective of this work is the selection of a source of inoculum free of pathogenic microorganisms by means of a thermal pretreatment and in this way is conducive to the treatment of residual sludge from the Citrus industry. The inoculum was taken from a geomembrane reactor which uses cattle manure as a substrate. 6 biodegradability kinetics were performed, varying the substrate-inoculum ratio, three of them with inoculum without pretreatment and another three with treatment, all under mesophilic conditions. SV parameters, pH, and biogas production were determined.","PeriodicalId":194964,"journal":{"name":"Renewable Energy, Biomass & Sustainability","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131589558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. C. Robles-Heredia, A. Ruíz-Marín, A. Narváez-García, Luis E. Escalante-Montejo, Mario Martínez-De la Cruz, Y. Canedo-López, L. J. Pérez-Reda, F. Tamayo‐Ordóñez, J. Zavala-Loría
In this work we analyzed different biochemical parameters such as cell growth, nitrogen removal, lipid productivity and fatty acid profile in Chlorella vulgaris by hydrodynamic effect varying the aeration to (0.75, 1.25, 1.75, 2.25) vvm and white light conditions continuous in column photobioreactor; hydrodynamic calculations of the FBR were carried out to determine the shear rate and possible existence of hydrodynamic stress at the proposed aeration conditions; the values reached in the shear rate were reduced (0.0025 to 0.0220) s-1, observing flow of homogeneous type in all the experiments; however, the maximum values of cell growth and specific growth rate (μ) were (5.90x106 cells mL-1 and 0.0229 d-1) respectively, as well as the highest N consumption (60%) and the highest productivity of lipids (8.98 mgL-1d-1) were reached during the experiment at 0.75 vvm. In relation to the analysis of the fatty acid profile greater presence of polyunsaturated fatty acids (PUFA) was observed in the experiments at 0.75 vvm, 1.75 vvm and 2.25 vvm, however, at 1.25 vvm, higher productivity of saturated fatty acids (SFA) was obtained; with respect to monounsaturated fatty acids (MUFA) the highest concentration was reflected at 0.75 vvm. The components with the highest presence in the fatty acid profile analysis were C12: 0; C20: 5N3; C24: 1; C 22: 0; C22: 2.
{"title":"Study of the hydrodynamic effect in column PBR on cellular growth, nitrogen removal, lipid productivity and fatty acid profile in Chlorella vulgaris.","authors":"J. C. Robles-Heredia, A. Ruíz-Marín, A. Narváez-García, Luis E. Escalante-Montejo, Mario Martínez-De la Cruz, Y. Canedo-López, L. J. Pérez-Reda, F. Tamayo‐Ordóñez, J. Zavala-Loría","doi":"10.56845/rebs.v1i1.11","DOIUrl":"https://doi.org/10.56845/rebs.v1i1.11","url":null,"abstract":"\u0000In this work we analyzed different biochemical parameters such as cell growth, nitrogen removal, lipid productivity and fatty acid profile in Chlorella vulgaris by hydrodynamic effect varying the aeration to (0.75, 1.25, 1.75, 2.25) vvm and white light conditions continuous in column photobioreactor; hydrodynamic calculations of the FBR were carried out to determine the shear rate and possible existence of hydrodynamic stress at the proposed aeration conditions; the values reached in the shear rate were reduced (0.0025 to 0.0220) s-1, observing flow of homogeneous type in all the experiments; however, the maximum values of cell growth and specific growth rate (μ) were (5.90x106 cells mL-1 and 0.0229 d-1) respectively, as well as the highest N consumption (60%) and the highest productivity of lipids (8.98 mgL-1d-1) were reached during the experiment at 0.75 vvm. In relation to the analysis of the fatty acid profile greater presence of polyunsaturated fatty acids (PUFA) was observed in the experiments at 0.75 vvm, 1.75 vvm and 2.25 vvm, however, at 1.25 vvm, higher productivity of saturated fatty acids (SFA) was obtained; with respect to monounsaturated fatty acids (MUFA) the highest concentration was reflected at 0.75 vvm. The components with the highest presence in the fatty acid profile analysis were C12: 0; C20: 5N3; C24: 1; C 22: 0; C22: 2. \u0000","PeriodicalId":194964,"journal":{"name":"Renewable Energy, Biomass & Sustainability","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133725349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Astorga-Zaragoza, Laura Vélez-Landa, Héctor Ricardo Hernández de-León, G. Osorio-Gordillo, José Roberto Bermúdez-Hernández
In this paper, a nonlinear observer design is presented for simultaneous parameter estimation and state variables estimation. The case of study is microalgae cultures for biodiesel generation, where reaction rates, biomass concentration, intracellular quota and nitrogen concentration are critical variables that provide information about the state of the process. However, these variables might be difficult to measure due to the lack of specific instruments, high sensor costs or infeasibility of installation in the process. Therefore, two observer-based virtual sensors are presented in this paper as an analytical alternative to perform estimation of the main important variables or parameters of the process: a nonlinear adaptive observer and a nonlinear high-gain observer. The observers are based on the Droop´s mathematical model that describes the ability of microalgae to store nutrients and the decoupling between substrate uptake and biomass growth. Numerical simulations are made in order to evaluate the performance of the proposed observers.
{"title":"Observer-based virtual sensors for microalgae cultures monitoring","authors":"C. Astorga-Zaragoza, Laura Vélez-Landa, Héctor Ricardo Hernández de-León, G. Osorio-Gordillo, José Roberto Bermúdez-Hernández","doi":"10.56845/rebs.v1i1.5","DOIUrl":"https://doi.org/10.56845/rebs.v1i1.5","url":null,"abstract":"In this paper, a nonlinear observer design is presented for simultaneous parameter estimation and state variables estimation. The case of study is microalgae cultures for biodiesel generation, where reaction rates, biomass concentration, intracellular quota and nitrogen concentration are critical variables that provide information about the state of the process. However, these variables might be difficult to measure due to the lack of specific instruments, high sensor costs or infeasibility of installation in the process. Therefore, two observer-based virtual sensors are presented in this paper as an analytical alternative to perform estimation of the main important variables or parameters of the process: a nonlinear adaptive observer and a nonlinear high-gain observer. The observers are based on the Droop´s mathematical model that describes the ability of microalgae to store nutrients and the decoupling between substrate uptake and biomass growth. Numerical simulations are made in order to evaluate the performance of the proposed observers.","PeriodicalId":194964,"journal":{"name":"Renewable Energy, Biomass & Sustainability","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122191863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Resumen: De acuerdo con las estadísticas del Banco Mundial, se estima que la cantidad anual generada de Residuos Sólidos Municipales - RSM en el mundo para el año 2014 fue de 1.3 billones de toneladas, con posibilidad de incrementarse a 2.2 billones para el año 2025. La proporción predominante de los RSM corresponde a los residuos sólidos orgánicos o Biorresiduos que se definen como los residuos orgánicos biodegradables de origen vegetal y/o animal, susceptibles de degradarse biológicamente y que son generados en el ámbito domiciliario y comercial tal como lo planteó la Unión Europea en su directiva 2008/98/CE. Es así como Waste to Energy - WtE se convierte en un área prometedora para el posible aprovechamiento energético de los RSM a nivel mundial, ya que constituye un eslabón en las cadenas de suministro de producción y servicios ya que de acuerdo con los principios de economía circular es necesario mantener mayor tiempo los residuos generados dentro de la cadena con preferencia por las practicas como el reciclaje y el aprovechamiento. En la búsqueda por conocer las tendencias de avance de WtE como área de conocimiento, se utilizan procesos como la vigilancia tecnológica que se sustenta en disciplinas sistemáticas como lo son la bibliometría con el objetivo de establecer el estado de avance de un área de conocimiento determinada comenzando por establecer una ruta de búsqueda bibliográfica en bases de datos indexadas, donde se utiliza una ecuación de búsqueda compuesta por palabras clave complementada por conectores booleanos. Posteriormente, estas búsquedas se introducen en software especializados de código libre como lo son Vosviewer® y SciMAT® para facilitar el cálculo de los principales indicadores bibliométricos (relevancia de autores, temáticas y revistas destacadas) y finamente establecer mapas estratégicos de desarrollo de campos de investigación relacionados. Como resultado final se establece que existe un amplio interés en enfocarse en el área de las decisiones frente a la selección de tecnologías WtE aplicadas en el contexto de la biomasa o biorresiduos, incluyendo áreas de análisis técnico-económicas para la planeación urbana del tratamiento y aprovechamiento de los RSM alineados con los planes institucionales.
{"title":"Estudio de las tendencias de investigación con respecto al tratamiento y aprovechamiento de los residuos sólidos municipales: un análisis bibliométrico aplicado","authors":"Jenny Fabiana Gaviria-Cuevas","doi":"10.56845/rebs.v1i1.4","DOIUrl":"https://doi.org/10.56845/rebs.v1i1.4","url":null,"abstract":"\u0000Resumen: De acuerdo con las estadísticas del Banco Mundial, se estima que la cantidad anual generada de Residuos Sólidos Municipales - RSM en el mundo para el año 2014 fue de 1.3 billones de toneladas, con posibilidad de incrementarse a 2.2 billones para el año 2025. La proporción predominante de los RSM corresponde a los residuos sólidos orgánicos o Biorresiduos que se definen como los residuos orgánicos biodegradables de origen vegetal y/o animal, susceptibles de degradarse biológicamente y que son generados en el ámbito domiciliario y comercial tal como lo planteó la Unión Europea en su directiva 2008/98/CE. Es así como Waste to Energy - WtE se convierte en un área prometedora para el posible aprovechamiento energético de los RSM a nivel mundial, ya que constituye un eslabón en las cadenas de suministro de producción y servicios ya que de acuerdo con los principios de economía circular es necesario mantener mayor tiempo los residuos generados dentro de la cadena con preferencia por las practicas como el reciclaje y el aprovechamiento. En la búsqueda por conocer las tendencias de avance de WtE como área de conocimiento, se utilizan procesos como la vigilancia tecnológica que se sustenta en disciplinas sistemáticas como lo son la bibliometría con el objetivo de establecer el estado de avance de un área de conocimiento determinada comenzando por establecer una ruta de búsqueda bibliográfica en bases de datos indexadas, donde se utiliza una ecuación de búsqueda compuesta por palabras clave complementada por conectores booleanos. Posteriormente, estas búsquedas se introducen en software especializados de código libre como lo son Vosviewer® y SciMAT® para facilitar el cálculo de los principales indicadores bibliométricos (relevancia de autores, temáticas y revistas destacadas) y finamente establecer mapas estratégicos de desarrollo de campos de investigación relacionados. Como resultado final se establece que existe un amplio interés en enfocarse en el área de las decisiones frente a la selección de tecnologías WtE aplicadas en el contexto de la biomasa o biorresiduos, incluyendo áreas de análisis técnico-económicas para la planeación urbana del tratamiento y aprovechamiento de los RSM alineados con los planes institucionales. \u0000","PeriodicalId":194964,"journal":{"name":"Renewable Energy, Biomass & Sustainability","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122516697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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