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Gonzalez-Perez, C.J.,Vargas-Arispuro, I.,Aispuro-Hernandez, E.,Aguilar-Gil, C.L.,Aguirre-Guzman, Y.E.,Castillo, A.,Hernandez-Mendoza, A.,Ayala-Zavala, J.F.,Martinez-Tellez, M.A. The Korean Society for Microbiology and Biotechnol 2019 한국미생물·생명공학회지 Vol.47 No.2
The consumption of fresh vegetables has been related to recurrent outbreaks of foodborne diseases (FBD) worldwide. Therefore, the development of effective alternative technologies is necessary to improve the safety of these products. This study aimed to isolate and identify epiphytic lactic acid bacteria (LAB) from fresh fruits and leafy vegetables and characterize their antagonistic capacity due to their ability to produce bacteriocins or antibacterial compounds. For this, 92 LAB isolates from fruits and leafy vegetables were screened for antagonistic activity. Two strains with the highest and broadest antagonistic activities were selected for further characterization; one from cantaloupe melon (strain CM175) and one from cilantro leaves (strain C15). The cell-free supernatants (CFS) of CM175 and C15 were found to exhibit antagonistic activity against FBD-causing pathogens. The CM175 and C15 strains were identified as Pediococcus pentosaceus and Lactobacillus graminis, respectively. Notably, the P. pentosaceus CM175 CFS stopped the growth of Salmonella Typhimurium, Salmonella Saintpaul, Staphylococcus aureus, and Listeria monocytogenes, and delayed Escherichia coli O157:H7 growth. Moreover, L. graminis C15 CFS delayed the growth of all indicator pathogens, but did not completely stop it. Organic acids and bacteriocin-like molecules were determined to be possibly exerting the observed antagonistic activity of the identified LAB strains. Thus, application of the antagonistic compounds produced by Pediococcus pentosaceus and Lactobacillus graminis could be a novel and ecological strategy in developing antimicrobial biopreservatives for the food industry and mitigating FBD by reducing the biological contamination in fruit and vegetable orchards, mainly via their potential in controlling both gram-negative and gram-positive pathogenic bacteria.
Angeles-Hernandez, J.C.,Albarran-Portillo, B.,Gomez Gonzalez, A.V.,Pescador Salas, N.,Gonzalez-Ronquillo, M. Asian Australasian Association of Animal Productio 2013 Animal Bioscience Vol.26 No.8
The objective of this study was to compare the goodness of fit of four lactation curve models: Wood's Gamma model (WD), Wilmink (WL), and Pollott's multiplicative two (POL2) and three parameters (POL3) and to determine the environmental factors affecting the complete lactation curve of F1 dairy sheep under organic management. A total of 5,382 weekly milk yields records from 150 ewes, under organic management were used. Residual mean square (RMS), determination coefficients ($R^2$), and correlation (r) analysis were used as an indicator of goodness of fit for each model. WL model best fitted the lactation curves as indicated by the lower RMS values (0.019), followed by WD (0.023), POL2 (0.025) and POL3 (0.029). The four models provided total milk yield (TMY) estimations that were highly correlated (0.93 to 0.97) with observed TMY (89.9 kg). The four models under estimated peak yield (PY), whereas POL2 and POL3 gave nearer peak time lactation estimations. Ewes lambing in autumn had higher TMY and showed a typical curve shape. Higher TMY were recorded in second and third lambing. Season of lambing, number of lambing and type of lambing had a great influenced over TMY shaping the complete lactation curve of F1 dairy sheep. In general terms WL model showed the best fit to the F1 dairy sheep lactation curve under organic management.
Tapia-Hernandez, Alejandro,Ponce-Silva, Mario,Olivares-Peregrino, Victor Hugo,Valdez-Resendiz, Jesus Elias,Hernandez-Gonzalez, Leobardo The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.4
The main contribution of this paper is the use of sensorless active diodes to generate the gate signals for a three-phase boost-rectifier with a self-powered control scheme. The sensorless operation is achieved making use of the gate control signals generated by the active diode schemes on each of the switching devices using a pulse width half-controlled boost rectifier modulation technique (PWM-HCBR). The proposed scheme synchronizes the gate control signals with a three phase voltage supply. Autonomous operation is obtained making use of the output DC bus to feed the control circuitry, the active diodes and the driver circuitry. The three-phase boost-rectifier is supplied by a three-phase permanent magnet electric generator powered by a solar concentrator dish with variable voltage and variable frequency conditions. Experimental results report an efficiency of up to 94.6% for 25 W and an input of 3.6 V peak per phase with 450.
Alejandro Tapia-Hernandez,Mario Ponce-Silva,Victor Hugo Olivares-Peregrino,Jesus Elias Valdez-Resendiz,Leobardo Hernandez-Gonzalez 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.4
The main contribution of this paper is the use of sensorless active diodes to generate the gate signals for a three-phase boost-rectifier with a self-powered control scheme. The sensorless operation is achieved making use of the gate control signals generated by the active diode schemes on each of the switching devices using a pulse width half-controlled boost rectifier modulation technique (PWM-HCBR). The proposed scheme synchronizes the gate control signals with a three phase voltage supply. Autonomous operation is obtained making use of the output DC bus to feed the control circuitry, the active diodes and the driver circuitry. The three-phase boost-rectifier is supplied by a three-phase permanent magnet electric generator powered by a solar concentrator dish with variable voltage and variable frequency conditions. Experimental results report an efficiency of up to 94.6% for 25 W and an input of 3.6 V peak per phase with 450.
Nelida A. Gonzalez Hernandez,Rebeca O. Millan Guerrero,Gabriel Ceja Espiritu,Luz M. Baltazar Rodriguez,Rafael Rodriguez Salazar,Bertha A. Olmedo Buenrostro,Irma G. Enriquez Maldonado,Valery Melnikov,J 한국유전학회 2008 Genes & Genomics Vol.30 No.6
The action of matrix metalloproteinases (MMPs) can weaken the arterial wall, contributing to the destabilizing and rupture of atheromatous plaque. Within the MMPs, type 2 stands out due to its action on basement membrane constituents. Previous studies have revealed elevated levels of MMP-2 in the acute phase of ischemic stroke (IS). An MMP-2 single nucleotide polymorphism, -1306T>C (rs243865), displayed strikingly high promoter activity with the C allele. Our study analyzed whether or not the MMP-2-1306T>C polymorphism contributed to the development of IS in a Mexican population. Ninety-eight patients with IS and 213 control subjects were analyzed. Genomic DNA isolation, polymerase chain reaction (PCR), and polymorphism detection by restriction enzyme digestion were performed to detect MMP-2-1306T>C polymorphism. An increased probability of IS associated with the MMP-2 CC genotype (OR, 1.70; 95% CI, 1.02-2.85) was found. IS risk associated with the CC genotype was more pronounced in hypertensive subjects (OR, 2.81; 95% CI, 1.4-5.5). The CC genotype was not associated with the development of primary hypertension. The data suggest that MMP-2-1306T>C polymorphism greatly contributes to IS development in the population studied, principally in hypertensive subjects. This case-control study lends support to the association of MMP-2 with stroke at the genetic level, an association consistent with MMP-2 participation in IS physiopathology.
( C. J. Gonzalez-perez ),( I. Vargas-arispuro ),( E. Aispuro-hernandez ),( C. L. Aguilar-gil ),( Y. E. Aguirre-guzman ),( A. Castillo ),( A. Hernandez-mendoza ),( J. F. Ayala-zavala ),( M. A. Martinez 한국미생물생명공학회(구 한국산업미생물학회) 2019 한국미생물·생명공학회지 Vol.47 No.2
The consumption of fresh vegetables has been related to recurrent outbreaks of foodborne diseases (FBD) worldwide. Therefore, the development of effective alternative technologies is necessary to improve the safety of these products. This study aimed to isolate and identify epiphytic lactic acid bacteria (LAB) from fresh fruits and leafy vegetables and characterize their antagonistic capacity due to their ability to produce bacteriocins or antibacterial compounds. For this, 92 LAB isolates from fruits and leafy vegetables were screened for antagonistic activity. Two strains with the highest and broadest antagonistic activities were selected for further characterization; one from cantaloupe melon (strain CM175) and one from cilantro leaves (strain C15). The cell-free supernatants (CFS) of CM175 and C15 were found to exhibit antagonistic activity against FBD-causing pathogens. The CM175 and C15 strains were identified as Pediococcus pentosaceus and Lactobacillus graminis, respectively. Notably, the P. pentosaceus CM175 CFS stopped the growth of Salmonella Typhimurium, Salmonella Saintpaul, Staphylococcus aureus, and Listeria monocytogenes, and delayed Escherichia coli O157:H7 growth. Moreover, L. graminis C15 CFS delayed the growth of all indicator pathogens, but did not completely stop it. Organic acids and bacteriocin-like molecules were determined to be possibly exerting the observed antagonistic activity of the identified LAB strains. Thus, application of the antagonistic compounds produced by Pediococcus pentosaceus and Lactobacillus graminis could be a novel and ecological strategy in developing antimicrobial biopreservatives for the food industry and mitigating FBD by reducing the biological contamination in fruit and vegetable orchards, mainly via their potential in controlling both gram-negative and gram-positive pathogenic bacteria.
Warm autoimmune hemolytic anemia: experience from a single referral center in Mexico City
Hernandez-Company Alonso,Anguiano-Alvarez Victor Manuel,Carmona Gonzalez Carlos Amir,Rodriguez-Rodriguez Sergio,Pomerantz Allan,Lopez-Karpovitch Xavier,Tuna-Aguilar Elena Juventina 대한혈액학회 2017 Blood Research Vol.52 No.1
Background: Autoimmune hemolytic anemia (AIHA) is characterized by an autoimmune-mediated de-struction of red blood cells. Warm AIHA (wAIHA) represents 60% of AIHA cases and is associated with the positive detection of IgG and C3d in the direct antiglobulin test (DAT). This study aimed to assess the clinical and laboratorial differences between primary and secondary wAIHA patients from a referral center in Mexico City. Methods: All patients diagnosed with wAIHA in our institution from January 1992 to December 2015 were included and received corticosteroids as the first-line treatment. We analyzed the response to the first-line treatment, relapse-free survival, and time to splenectomy. Results: Eighty-nine patients were included. Secondary wAIHA represented 55.1% of the cases. At diagnosis, secondary wAIHA patients showed a DAT mixed pattern more frequently than primary wAIHA patients (36.7 vs. 17.5%, P<0.001). In the survival analysis, patients with secondary wAIHA had a lower time to response (18 vs. 37 days, P=0.05), median disease-free survival (28.51 vs. 50.95 weeks, P=0.018), and time to splenectomy (43.5 vs. 61 wks, P=0.029) than those with primary wAIHA. Due to economic constraints, ritux-imab was considered as the third-line treatment in only two patients. Conclusion: Secondary wAIHA may benefit from a longer low-dose steroid maintenance period mainly due to its shorter time to relapse and time to splenectomy than primary wAIHA.
Warm autoimmune hemolytic anemia: experience from a single referral center in Mexico City
Hernandez-Company Alonso,Anguiano-Alvarez Victor Manuel,Carmona Gonzalez Carlos Amir,Rodriguez-Rodriguez Sergio,Pomerantz Allan,Lopez-Karpovitch Xavier,Tuna-Aguilar Elena Juventina 대한혈액학회 2017 Blood Research Vol.52 No.1
Background: Autoimmune hemolytic anemia (AIHA) is characterized by an autoimmune-mediated de-struction of red blood cells. Warm AIHA (wAIHA) represents 60% of AIHA cases and is associated with the positive detection of IgG and C3d in the direct antiglobulin test (DAT). This study aimed to assess the clinical and laboratorial differences between primary and secondary wAIHA patients from a referral center in Mexico City. Methods: All patients diagnosed with wAIHA in our institution from January 1992 to December 2015 were included and received corticosteroids as the first-line treatment. We analyzed the response to the first-line treatment, relapse-free survival, and time to splenectomy. Results: Eighty-nine patients were included. Secondary wAIHA represented 55.1% of the cases. At diagnosis, secondary wAIHA patients showed a DAT mixed pattern more frequently than primary wAIHA patients (36.7 vs. 17.5%, P<0.001). In the survival analysis, patients with secondary wAIHA had a lower time to response (18 vs. 37 days, P=0.05), median disease-free survival (28.51 vs. 50.95 weeks, P=0.018), and time to splenectomy (43.5 vs. 61 wks, P=0.029) than those with primary wAIHA. Due to economic constraints, ritux-imab was considered as the third-line treatment in only two patients. Conclusion: Secondary wAIHA may benefit from a longer low-dose steroid maintenance period mainly due to its shorter time to relapse and time to splenectomy than primary wAIHA.
La Productividad en los Distritos Agrícolas de Durango, México
Juana Hernandez Chavarria,Ivan Gonzalez Lazalde,Maria Quetzalcihuatl Galvan Is 한국라틴아메리카학회 2021 라틴아메리카연구 Vol.34 No.3
The objective of this work is to analyze the productivity index of the agricultural districts of the state of Durango, and to identify the influence of education, age and gender. It was started from the alternative hypothesis that the mean distribution is different in the districts and between the categories. The Kruskal Wallis and Wilcoxon tests were applied to identify results in the districts with the highest and lowest productivity, as well as 129 structured questionnaires for producers. The results show that there are differences in productivity between district VI and district I. The results can be explained by the cultivation modality in district VI 60% is irrigated and in district I only 24%when they coincide in the types of crops. No differences are found in the average productivity in relation to the categories. The results show that the factors that are exogenous to the characteristics of the producer are those that have the greatest impact, and it is shown that access to water is one of them.