Pub Date : 2019-09-01DOI: 10.33996/revistaingenieria.v3i7.47
Farith Augusto Hinojosa Coca
En esta investigación, se realizó la comparación técnico – económica de los resultados obtenidos del diseño de losas macizas de hormigón armado a partir del análisis estructural mediante el enfoque elástico de la norma CBH 87 y el enfoque plástico de la teoría de líneas de rotura. El objetivo de la investigación fue cuantificar los efectos que causa el empleo del método de análisis plástico de líneas de rotura, en el diseño de losas macizas de hormigón armado en cuanto al consumo de acero de refuerzo y en cuanto a las flechas y anchos de fisura en el estado límite de servicio. Se realizó la modelación del comportamiento resistente y deformacional de losas macizas en dos direcciones con el fin de definir los casos de estudio de la investigación. Se comprobó los estados límite de servicio en ambos casos de diseño y se efectuó una comparación técnico – económica de los resultados alcanzados por ambos casos de diseño, en cuanto a los valores de la cuantía y costo del acero de refuerzo, los anchos de fisura y las flechas que presenta cada caso de estudio.
{"title":"Comparación de losas macizas de hormigón mediante dos enfoques","authors":"Farith Augusto Hinojosa Coca","doi":"10.33996/revistaingenieria.v3i7.47","DOIUrl":"https://doi.org/10.33996/revistaingenieria.v3i7.47","url":null,"abstract":"En esta investigación, se realizó la comparación técnico – económica de los resultados obtenidos del diseño de losas macizas de hormigón armado a partir del análisis estructural mediante el enfoque elástico de la norma CBH 87 y el enfoque plástico de la teoría de líneas de rotura. El objetivo de la investigación fue cuantificar los efectos que causa el empleo del método de análisis plástico de líneas de rotura, en el diseño de losas macizas de hormigón armado en cuanto al consumo de acero de refuerzo y en cuanto a las flechas y anchos de fisura en el estado límite de servicio. Se realizó la modelación del comportamiento resistente y deformacional de losas macizas en dos direcciones con el fin de definir los casos de estudio de la investigación. Se comprobó los estados límite de servicio en ambos casos de diseño y se efectuó una comparación técnico – económica de los resultados alcanzados por ambos casos de diseño, en cuanto a los valores de la cuantía y costo del acero de refuerzo, los anchos de fisura y las flechas que presenta cada caso de estudio.","PeriodicalId":21335,"journal":{"name":"Revista Mexicana de Ingeniería Química","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80467779","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}
Pub Date : 2019-09-01DOI: 10.33996/revistaingenieria.v3i7.48
Andy Leal Rodríguez
El objetivo del estudio se centró en analizar la gestión de riesgos en las gerencias de seguridad industrial de la industria petrolera venezolana. Se tipificó como una investigación descriptiva, con diseño no experimental, transeccional y de campo. La población estuvo conformada por las cuatro (4) gerencias de seguridad industrial de la industria petrolera en occidente, cuyos sujetos informantes fueron gerentes y superintendentes. La técnica de recolección de datos fue la encuesta, y el instrumento un cuestionario con 69 reactivos y una escala de frecuencias de cinco (5) opciones de respuesta. Se utilizó el juicio de expertos para la validez del mismo y el coeficiente Alfa de Cronbach para su confiabilidad, cuyo valor de 0,863 demostró muy alta confiabilidad. Se aplicó como técnica para el análisis la estadística descriptiva, a través de la media aritmética (X ?). Del análisis se comprobó buena gestión dirigida a la prevención de los riesgos.
{"title":"Gestión de riesgos en las gerencias de seguridad industrial de la industria petrolera venezolana","authors":"Andy Leal Rodríguez","doi":"10.33996/revistaingenieria.v3i7.48","DOIUrl":"https://doi.org/10.33996/revistaingenieria.v3i7.48","url":null,"abstract":"El objetivo del estudio se centró en analizar la gestión de riesgos en las gerencias de seguridad industrial de la industria petrolera venezolana. Se tipificó como una investigación descriptiva, con diseño no experimental, transeccional y de campo. La población estuvo conformada por las cuatro (4) gerencias de seguridad industrial de la industria petrolera en occidente, cuyos sujetos informantes fueron gerentes y superintendentes. La técnica de recolección de datos fue la encuesta, y el instrumento un cuestionario con 69 reactivos y una escala de frecuencias de cinco (5) opciones de respuesta. Se utilizó el juicio de expertos para la validez del mismo y el coeficiente Alfa de Cronbach para su confiabilidad, cuyo valor de 0,863 demostró muy alta confiabilidad. Se aplicó como técnica para el análisis la estadística descriptiva, a través de la media aritmética (X ?). Del análisis se comprobó buena gestión dirigida a la prevención de los riesgos.","PeriodicalId":21335,"journal":{"name":"Revista Mexicana de Ingeniería Química","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86570878","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}
Pub Date : 2019-09-01DOI: 10.33996/revistaingenieria.v3i7.49
M. Borrero
El estudio buscó identificar las condiciones de trabajo de seguridad industrial, ambiente e higiene ocupacional en las universidades públicas de la Costa Oriental del Lago de Maracaibo. Metodológicamente, la investigación se tipificó como descriptiva, con diseño de campo, no experimental y transeccional. La población estuvo constituida por los trabajadores de mantenimiento y supervisores de SIAHO de las universidades bajo estudio. Para la recolección de datos se utilizó la encuesta mediante un cuestionario, conformado por 18 ítems con escala de frecuencia, validado a través del juicio de expertos y cuya confiabilidad (Alfa de Cronbach), fue de 0,96. El análisis de los datos se realizó mediante la estadística descriptiva, con base en la media aritmética. Se concluye que existe alta presencia para identificar las condiciones de trabajo inseguro, incidente, accidente de trabajo y orden – limpieza como condiciones bajo las cuales se realiza la ejecución de las tareas.
{"title":"Condiciones de trabajo de SIAHO en las universidades públicas de la Costa Oriental del Lago de Maracaibo","authors":"M. Borrero","doi":"10.33996/revistaingenieria.v3i7.49","DOIUrl":"https://doi.org/10.33996/revistaingenieria.v3i7.49","url":null,"abstract":"El estudio buscó identificar las condiciones de trabajo de seguridad industrial, ambiente e higiene ocupacional en las universidades públicas de la Costa Oriental del Lago de Maracaibo. Metodológicamente, la investigación se tipificó como descriptiva, con diseño de campo, no experimental y transeccional. La población estuvo constituida por los trabajadores de mantenimiento y supervisores de SIAHO de las universidades bajo estudio. Para la recolección de datos se utilizó la encuesta mediante un cuestionario, conformado por 18 ítems con escala de frecuencia, validado a través del juicio de expertos y cuya confiabilidad (Alfa de Cronbach), fue de 0,96. El análisis de los datos se realizó mediante la estadística descriptiva, con base en la media aritmética. Se concluye que existe alta presencia para identificar las condiciones de trabajo inseguro, incidente, accidente de trabajo y orden – limpieza como condiciones bajo las cuales se realiza la ejecución de las tareas.","PeriodicalId":21335,"journal":{"name":"Revista Mexicana de Ingeniería Química","volume":"84 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86616942","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. D. Valenzuela-Cobos, R. O. Rodríguez-Grimón, M. L. Jara-Bastidas, A. Grijalva-Endara, D. C. Zied, M. E. Garín-Aguilar, G. Valencia del Toro
The kinetics of mycelial growth of parental strains, hybrid and reconstituted of Pleurotus and Lentinula was calculated using the mycelial growth diameter for (malt extract agar) MEA. For wheat grain was determinate using the mycelial growth volume. The parameters were adjusted to one Linear Model and 3 nonlinear models (Baranyi, Exponential, Logistic) to determine the specific growth speed (μmax) and lag phase time (λ). The hybrid and reconstituted strains of Pleurotus spp. and Lentinula edodes showed similar mycelial morphology with exception of the hybrid PD4xLC3. The mycelial kinetics of the dikaryotic strains on MEA using 4 mathematical models showed μmax between 6.30 and 23.49 mm day−1 and the lag phase ranged from 0.22 to 4.47 h; while on wheat grain presented μmax since 0.08 to 11.41 cm3 day−1 and lag duration between 0.06 and 8.04 h. The hybrid strain PO5xLC2 and the reconstituted strain of Pleurotus djamor PD1xPD4 showed the highest μmax and lowest lag phase on MEA and wheat grain respectively in comparison to the other strains include their parental strains. The results showed that the hybrid and reconstituted strains of Pleurotus and Lentinula presented high st my elial growth kinetics on EMA and on wheat grain in relation to their parental strains.
利用(麦芽提取物琼脂)MEA的菌丝生长直径计算了侧耳菇和香菇亲本菌株、杂交菌株和重组菌株的菌丝生长动力学。用菌丝生长量法测定小麦籽粒中菌丝的生长量。将参数调整为1个线性模型和3个非线性模型(Baranyi、Exponential、Logistic)来确定比生长速度(μmax)和滞后相位时间(λ)。除杂交菌株PD4xLC3外，侧耳菇和香菇的菌丝形态与重组菌株相似。采用4种数学模型对双核菌株在MEA上的菌丝动力学进行了分析，结果表明μmax在6.30 ~ 23.49 mm day - 1之间，滞后期在0.22 ~ 4.47 h之间;杂交菌株PO5xLC2和重组菌株PD1xPD4在MEA和小麦籽粒上的μmax和滞后期分别为0.08 ~ 11.41 cm3 day - 1和0.06 ~ 8.04 h。与包括亲本菌株在内的其他菌株相比，杂种菌株PO5xLC2和重组菌株PD1xPD4在MEA和小麦籽粒上的μmax和滞后期分别最高和最低。结果表明，侧耳菇和香菇的杂交和重组菌株在EMA和小麦籽粒上的生长动力学均高于亲本菌株。
{"title":"MODELING OF MYCELIAL GROWTH OF PARENTAL, HYBRID AND RECONSTITUTED STRAINS OF Pleurotus AND Lentinula","authors":"J. D. Valenzuela-Cobos, R. O. Rodríguez-Grimón, M. L. Jara-Bastidas, A. Grijalva-Endara, D. C. Zied, M. E. Garín-Aguilar, G. Valencia del Toro","doi":"10.24275/rmiq/bio533","DOIUrl":"https://doi.org/10.24275/rmiq/bio533","url":null,"abstract":"The kinetics of mycelial growth of parental strains, hybrid and reconstituted of Pleurotus and Lentinula was calculated using the mycelial growth diameter for (malt extract agar) MEA. For wheat grain was determinate using the mycelial growth volume. The parameters were adjusted to one Linear Model and 3 nonlinear models (Baranyi, Exponential, Logistic) to determine the specific growth speed (μmax) and lag phase time (λ). The hybrid and reconstituted strains of Pleurotus spp. and Lentinula edodes showed similar mycelial morphology with exception of the hybrid PD4xLC3. The mycelial kinetics of the dikaryotic strains on MEA using 4 mathematical models showed μmax between 6.30 and 23.49 mm day−1 and the lag phase ranged from 0.22 to 4.47 h; while on wheat grain presented μmax since 0.08 to 11.41 cm3 day−1 and lag duration between 0.06 and 8.04 h. The hybrid strain PO5xLC2 and the reconstituted strain of Pleurotus djamor PD1xPD4 showed the highest μmax and lowest lag phase on MEA and wheat grain respectively in comparison to the other strains include their parental strains. The results showed that the hybrid and reconstituted strains of Pleurotus and Lentinula presented high st my elial growth kinetics on EMA and on wheat grain in relation to their parental strains.","PeriodicalId":21335,"journal":{"name":"Revista Mexicana de Ingeniería Química","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84564407","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}
Maylem Z Rodríguez-Rodríguez, A. Quintero-Ramos, C. O. Meléndez-Pizarro, J. A. Meza-Velázquez, J. Jiménez-Castro, M. Sánchez‐Madrigal, M. G. Ruiz-Gutiérrez, J. Espinoza-Hicks
UV-C irradiation doses (12.8, 24.2, 35.8, and 54.6 mJ · cm − 2 ) on the physicochemical and microbiological properties of 10% Aloe vera gel at di ff erent pHs (3.5, 4.5, and 5.5) were evaluated. An unprocessed treatment (UP) and a short (45 s) thermal treatment (TT) at 90 °C were used as controls. The irradiation doses and pH levels a ff ected ( p < 0 . 05) the elimination of coliforms and aerobic mesophilic microorganisms with the same e ffi ciency as TT. Molds and yeasts were successfully eliminated at doses ≥ 24.2 mJ · cm − 2 regardless of pH. Reducing sugars, total polyphenols, and aloin A content decreased as pH increased ( p < 0 . 05). Although, the antioxidant activity was significantly reduced at doses ≥ 35.8 mJ · cm − 2 . TT and UV-C treatments a ff ected the a ∗ color parameter ( p < 0 . 05), resulting the UV-C with the highest values. In both treatments, a reddish color was present at pH ≥ 4.5. The UV-C treatment resulted in minimal changes in most physicochemical properties, compared to UP treatment. However, TT significantly a ff ected most physicochemical properties of A. vera gel blends. These results suggest that dose of 24.2 mJ · cm − 2 in a continuous flow UV system is a non-thermal alternative for the stabilization of 10% A. vera gel blends at pH of 3.5.
{"title":"MICROBIAL AND PHYSICOCHEMICAL PROPERTIES OF UV-C PROCESSED Aloe vera GEL BLENDS AT DIFFERENT pHs USING A CONTINUOUS FLOW UV SYSTEM","authors":"Maylem Z Rodríguez-Rodríguez, A. Quintero-Ramos, C. O. Meléndez-Pizarro, J. A. Meza-Velázquez, J. Jiménez-Castro, M. Sánchez‐Madrigal, M. G. Ruiz-Gutiérrez, J. Espinoza-Hicks","doi":"10.24275/RMIQ/PROC566","DOIUrl":"https://doi.org/10.24275/RMIQ/PROC566","url":null,"abstract":"UV-C irradiation doses (12.8, 24.2, 35.8, and 54.6 mJ · cm − 2 ) on the physicochemical and microbiological properties of 10% Aloe vera gel at di ff erent pHs (3.5, 4.5, and 5.5) were evaluated. An unprocessed treatment (UP) and a short (45 s) thermal treatment (TT) at 90 °C were used as controls. The irradiation doses and pH levels a ff ected ( p < 0 . 05) the elimination of coliforms and aerobic mesophilic microorganisms with the same e ffi ciency as TT. Molds and yeasts were successfully eliminated at doses ≥ 24.2 mJ · cm − 2 regardless of pH. Reducing sugars, total polyphenols, and aloin A content decreased as pH increased ( p < 0 . 05). Although, the antioxidant activity was significantly reduced at doses ≥ 35.8 mJ · cm − 2 . TT and UV-C treatments a ff ected the a ∗ color parameter ( p < 0 . 05), resulting the UV-C with the highest values. In both treatments, a reddish color was present at pH ≥ 4.5. The UV-C treatment resulted in minimal changes in most physicochemical properties, compared to UP treatment. However, TT significantly a ff ected most physicochemical properties of A. vera gel blends. These results suggest that dose of 24.2 mJ · cm − 2 in a continuous flow UV system is a non-thermal alternative for the stabilization of 10% A. vera gel blends at pH of 3.5.","PeriodicalId":21335,"journal":{"name":"Revista Mexicana de Ingeniería Química","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90779227","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}
{"title":"THIOUREA DETERMINATION FOR THE PRECIOUS METALS LEACHING PROCESS BY IODATE TITRATION","authors":"D. Calla-Choque, F. Nava-Alonso","doi":"10.24275/rmiq/ia539","DOIUrl":"https://doi.org/10.24275/rmiq/ia539","url":null,"abstract":"","PeriodicalId":21335,"journal":{"name":"Revista Mexicana de Ingeniería Química","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74621846","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}
F. Alcázar-Medina, C. Núñez-Núñez, M. Rodríguez-Rosales, S. Valle‐Cervantes, M. Alarcón-Herrera, J. Proal-Nájera
{"title":"LEAD REMOVAL FROM AQUEOUS SOLUTION BY SPHERICAL AGGLOMERATION USING AN EXTRACT OF Agave lechuguilla Torr. AS BIOSURFACTANT","authors":"F. Alcázar-Medina, C. Núñez-Núñez, M. Rodríguez-Rosales, S. Valle‐Cervantes, M. Alarcón-Herrera, J. Proal-Nájera","doi":"10.24275/rmiq/bio491","DOIUrl":"https://doi.org/10.24275/rmiq/bio491","url":null,"abstract":"","PeriodicalId":21335,"journal":{"name":"Revista Mexicana de Ingeniería Química","volume":"114 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80083232","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}
M. T. Hernández-Botello, J.L. Barriada-Pereira, M. E. Sastre de Vicente, J. Mendoza-Pérez, J. Chanona-Pérez, M. López-Cortez, D. Téllez-Medina
{"title":"DETERMINATION OF BIOSORPTION MECHANISM IN BIOMASS OF AGAVE, USING SPECTROSCOPIC AND MICROSCOPIC TECHNIQUES FOR THE PURIFICATION OF CONTAMINATED WATER","authors":"M. T. Hernández-Botello, J.L. Barriada-Pereira, M. E. Sastre de Vicente, J. Mendoza-Pérez, J. Chanona-Pérez, M. López-Cortez, D. Téllez-Medina","doi":"10.24275/rmiq/ia501","DOIUrl":"https://doi.org/10.24275/rmiq/ia501","url":null,"abstract":"","PeriodicalId":21335,"journal":{"name":"Revista Mexicana de Ingeniería Química","volume":"89 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80266327","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}
G. Montalvo, M. Téllez-Téllez, Rubén Díaz, Carmen Sánchez, G. Díaz-Godínez
Pleurotus ostreatus produces laccase isoenzymes depending on the conditions in which it grows, it has been suggested that the presence of inducers, the pH of the culture medium as well as the type and concentration of carbon and nitrogen sources promote the production of these isoenzymes, however, the e ff ect of temperature of Pleurotus ostreatus growth on its production of laccase isoenzymes has not been evaluated. In this study, Pleurotus ostreatus was grown in solid-state fermentation at di ff erent temperatures (10, 15, 20, 25, 30 and 35 °C) and the activity and isoenzymes number of laccases produced in each bioprocess was determined. At 10 and 35 °C there was no growth of the fungus. The activity of laccases was di ff erent in each fermentation, being at 25 ºC where the highest value was observed (20000 U L − 1 ). The laccase isoenzymes pattern was also di ff erent depending on the incubation temperature of the fungus, it was observed in some times of the culture, 4 isoenzymes in the fermentations incubated at 15 and 20 ºC, 3 isoenzymes at 25 ºC and 2 isoenzymes at 30 ºC. These results show that the growth temperature of Pleurotus ostreatus modifies its activity profiles and its isoenzyme patterns of laccases. Pleurotus , solid-state fermentation, temperature, zymograms.
平菇产生漆酶同工酶取决于其生长条件，有人认为诱导剂的存在、培养基的pH以及碳源和氮源的类型和浓度促进了这些同工酶的产生，但平菇生长温度对其产生漆酶同工酶的影响尚未得到评价。本研究以平菇为研究对象，在不同温度(10、15、20、25、30和35℃)下进行固态发酵，测定各生物过程中产生的漆酶活性和同工酶数。在10°C和35°C时，真菌没有生长。每次发酵中漆酶的活性不同，在25℃时达到最高值(20000 U L−1)。漆酶同工酶模式也因真菌培养温度的不同而不同，在培养的某些时间，在15和20℃的发酵中观察到4个同工酶，在25℃的发酵中观察到3个同工酶，在30℃的发酵中观察到2个同工酶。这些结果表明，平菇的生长温度改变了平菇漆酶的活性谱和同工酶谱。侧耳菌，固态发酵，温度，酶谱。
{"title":"ISOENZYMES AND ACTIVITY OF LACCASES PRODUCED BY Pleurotus ostreatus GROWN AT DIFFERENT TEMPERATURES","authors":"G. Montalvo, M. Téllez-Téllez, Rubén Díaz, Carmen Sánchez, G. Díaz-Godínez","doi":"10.24275/RMIQ/BIO570","DOIUrl":"https://doi.org/10.24275/RMIQ/BIO570","url":null,"abstract":"Pleurotus ostreatus produces laccase isoenzymes depending on the conditions in which it grows, it has been suggested that the presence of inducers, the pH of the culture medium as well as the type and concentration of carbon and nitrogen sources promote the production of these isoenzymes, however, the e ff ect of temperature of Pleurotus ostreatus growth on its production of laccase isoenzymes has not been evaluated. In this study, Pleurotus ostreatus was grown in solid-state fermentation at di ff erent temperatures (10, 15, 20, 25, 30 and 35 °C) and the activity and isoenzymes number of laccases produced in each bioprocess was determined. At 10 and 35 °C there was no growth of the fungus. The activity of laccases was di ff erent in each fermentation, being at 25 ºC where the highest value was observed (20000 U L − 1 ). The laccase isoenzymes pattern was also di ff erent depending on the incubation temperature of the fungus, it was observed in some times of the culture, 4 isoenzymes in the fermentations incubated at 15 and 20 ºC, 3 isoenzymes at 25 ºC and 2 isoenzymes at 30 ºC. These results show that the growth temperature of Pleurotus ostreatus modifies its activity profiles and its isoenzyme patterns of laccases. Pleurotus , solid-state fermentation, temperature, zymograms.","PeriodicalId":21335,"journal":{"name":"Revista Mexicana de Ingeniería Química","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74898026","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}
Se presenta un método analítico, matemáticamente exacto y explícito para implementar la corrección por inclinación, descrita en la norma ISO 12917:2017 para calibración de tanques horizontales cilíndricos. El método es superior al método gráfico propuesto en la norma hasta 2017 y mejora lo propuesto en la norma actual. Se discuten y aclaran varias de las dificultades que presenta el método de corrección de la norma. Como aporte novedoso, se produjeron dos tablas numéricas con valores de corrección por inclinación, equivalentes a la Figura A-1 de la norma ISO 12917:2002 y las cuales no se han reportado previamente.
{"title":"Implementación de tablas de corrección al volumen del tanque cilíndrico horizontal inclinado, compatibles con la norma ISO 12917:2017","authors":"R. M. Casal, José Rafael Mora Casal","doi":"10.15517/ri.v29i2.36211","DOIUrl":"https://doi.org/10.15517/ri.v29i2.36211","url":null,"abstract":"Se presenta un método analítico, matemáticamente exacto y explícito para implementar la corrección por inclinación, descrita en la norma ISO 12917:2017 para calibración de tanques horizontales cilíndricos. El método es superior al método gráfico propuesto en la norma hasta 2017 y mejora lo propuesto en la norma actual. Se discuten y aclaran varias de las dificultades que presenta el método de corrección de la norma. Como aporte novedoso, se produjeron dos tablas numéricas con valores de corrección por inclinación, equivalentes a la Figura A-1 de la norma ISO 12917:2002 y las cuales no se han reportado previamente.","PeriodicalId":21335,"journal":{"name":"Revista Mexicana de Ingeniería Química","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84202594","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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