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Search Results: 1 - 10 of 666206 matches for " Carlos M. Cortés-Romero "
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Degradation of Indigo Carmine Using Advanced Oxidation Processes: Synergy Effects and Toxicological Study  [PDF]
Elba Ortiz, Violeta Gómez-Chávez, Carlos M. Cortés-Romero, Hugo Solís, Rubén Ruiz-Ramos, Sandra Loera-Serna
Journal of Environmental Protection (JEP) , 2016, DOI: 10.4236/jep.2016.712137
Abstract:
The physicochemical degradation of Indigo Carmine (IC) dye in aqueous solution was performed using single and combined Advanced Oxidation Processes (AOP’s). Photocatalysis (TiO2-UV), Ozonation (O3) and Sonolysis (SN) were tested either in a standalone methodology or by combination of two simultaneous AOP’s. The dye conversion was followed by both measurements: 1) color removal determined by UV-VIS spectrometry and 2) organic and inorganic load determined by the chemical oxygen demand (COD). A complete and quick color disappearance of model water waste has been obtained by using combination of non-irradiated AOP’s, namely, O3/SN, which contrasts to the combination of irradiated photocatalysis with O3 or sonolysis. Color removal with simultaneous TiO2-UV/SN reached 77% while TiO2-UV/O3 reached 96% at similar reaction time. On the other hand, the standalone O3 yielded the highest color removal (94.4%) in 32 minutes whereas SN reached only 39.2% in 4 hours. The standalone light irradiated TiO2-UV reached 93.3% color re-moval in one hour of reaction time. These results indicated that non-irradiated (SN and O3) enhance synergistic effects that provoke structural changes in dye molecule without reaching total degradation. This is evidenced from FTIR of residuals from reaction mixture in which it has been observed the presence of organic molecules such as aromatics, sulfonic and amines refractory compounds that are mechanisti-cally possible to be found during IC degradation. Also, toxicity tests (MicroTox
Analysis and Optimization of Bulk DNA Sampling with Binary Scoring for Germplasm Characterization
M. Humberto Reyes-Valdés, Amalio Santacruz-Varela, Octavio Martínez, June Simpson, Corina Hayano-Kanashiro, Celso Cortés-Romero
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0079936
Abstract: The strategy of bulk DNA sampling has been a valuable method for studying large numbers of individuals through genetic markers. The application of this strategy for discrimination among germplasm sources was analyzed through information theory, considering the case of polymorphic alleles scored binarily for their presence or absence in DNA pools. We defined the informativeness of a set of marker loci in bulks as the mutual information between genotype and population identity, composed by two terms: diversity and noise. The first term is the entropy of bulk genotypes, whereas the noise term is measured through the conditional entropy of bulk genotypes given germplasm sources. Thus, optimizing marker information implies increasing diversity and reducing noise. Simple formulas were devised to estimate marker information per allele from a set of estimated allele frequencies across populations. As an example, they allowed optimization of bulk size for SSR genotyping in maize, from allele frequencies estimated in a sample of 56 maize populations. It was found that a sample of 30 plants from a random mating population is adequate for maize germplasm SSR characterization. We analyzed the use of divided bulks to overcome the allele dilution problem in DNA pools, and concluded that samples of 30 plants divided into three bulks of 10 plants are efficient to characterize maize germplasm sources through SSR with a good control of the dilution problem. We estimated the informativeness of 30 SSR loci from the estimated allele frequencies in maize populations, and found a wide variation of marker informativeness, which positively correlated with the number of alleles per locus.
Quantum Chemical Calculations on the Interaction between Flavonol and Functional Monomers (Methacrylic Acid and 4-Vinylpyridine) in Molecularly Imprinted Polymers
Luis Enrique Gómez-Pineda,Georgina Esther Pina-Luis,Carlos Martín Cortés-Romero,Manuel Eduardo Palomar-Pardavé,Giselle Alicia Rosquete-Pina,Marta Elena Díaz-García,María de los Angeles Cuán Hernández
Molecules , 2010, DOI: 10.3390/molecules15064017
Abstract: Quantum chemical calculations were performed to characterize the interaction of the flavonol molecule (FL) with methacrylic acid (MAA) and 4-vinylpyridine (4VPy) in the formation of imprinted polymers. The polarizable continuum model (PCM) was used to gain insight on the type of interaction between the reactant molecules under vacuum conditions and in the presence of different solvents. The effect of solvent on the pre-polymerization complex formation was evaluated through the stability energy, in which chloroform behaves as the best solvent for the synthesis of the imprinted polymers since it facilitates the reaction by lowering its degree of stabilization. The reactivity was analyzed in terms of the electrostatic surface potential (ESP) and Mulliken charge. By means of these results, it has been possible to determine two potential recognition sites for the interaction of the MAA monomer and one for the 4VPy in relation to the strength of interaction with FL. In this concern, the interaction of the system FL-MAA is stronger than FL-4VPy.
Molecular and Functional Characterization of Novel Fructosyltransferases and Invertases from Agave tequilana
Celso Cortés-Romero, Aída Martínez-Hernández, Erika Mellado-Mojica, Mercedes G. López, June Simpson
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0035878
Abstract: Fructans are the main storage polysaccharides found in Agave species. The synthesis of these complex carbohydrates relies on the activities of specific fructosyltransferase enzymes closely related to the hydrolytic invertases. Analysis of Agave tequilana transcriptome data led to the identification of ESTs encoding putative fructosyltransferases and invertases. Based on sequence alignments and structure/function relationships, two different genes were predicted to encode 1-SST and 6G-FFT type fructosyltransferases, in addition, 4 genes encoding putative cell wall invertases and 4 genes encoding putative vacuolar invertases were also identified. Probable functions for each gene, were assigned based on conserved amino acid sequences and confirmed for 2 fructosyltransferases and one invertase by analyzing the enzymatic activity of recombinant Agave protein s expressed and purified from Pichia pastoris. The genome organization of the fructosyltransferase/invertase genes, for which the corresponding cDNA contained the complete open reading frame, was found to be well conserved since all genes were shown to carry a 9 bp mini-exon and all showed a similar structure of 8 exons/7 introns with the exception of a cell wall invertase gene which has 7 exons and 6 introns. Fructosyltransferase genes were strongly expressed in the storage organs of the plants, especially in vegetative stages of development and to lower levels in photosynthetic tissues, in contrast to the invertase genes where higher levels of expression were observed in leaf tissues and in mature plants.
Dealing with Run-Time Variability in Service Robotics: Towards a DSL for Non-Functional Properties
Juan Francisco Inglés-Romero,Alex Lotz,Cristina Vicente Chicote,Christian Schlegel
Computer Science , 2013,
Abstract: Service robots act in open-ended, natural environments. Therefore, due to combinatorial explosion of potential situations, it is not possible to foresee all eventualities in advance during robot design. In addition, due to limited resources on a mobile robot, it is not feasible to plan any action on demand. Hence, it is necessary to provide a mechanism to express variability at design-time that can be efficiently resolved on the robot at run-time based on the then available information. In this paper, we introduce a DSL to express run- time variability focused on the execution quality of the robot (in terms of non-functional properties like safety and task efficiency) under changing situations and limited resources. We underpin the applicability of our approach by an example integrated into an overall robotics architecture.
Applying the Wiener-Hermite Random Technique to Study the Evolution of Excess Weight Population in the Region of Valencia (Spain)  [PDF]
J.-C. Cortés, J.-V. Romero, M.-D. Roselló, R.-J. Villanueva
American Journal of Computational Mathematics (AJCM) , 2012, DOI: 10.4236/ajcm.2012.24037
Abstract: This paper proposes a stochastic model to study the evolution of normal and excess weight population between 24 - 65 years old in the region of Valencia (Spain). An approximate solution process of the random model is obtained by taking advantage of Wiener-Hermite expansion together with a perturbation method (WHEP). The random model takes as starting point a classical deterministic SIS—type epidemiological model in order to improve it in several ways. Firstly, the stochastic model enhances the deterministic one because it considers uncertainty in its formulation, what it is considered more realistic in dealing with a complex problem as obesity is. Secondly, WHEP approach provides valuable information such as average and variance functions of the approximate solution stochastic process to random model. This fact is remarkable because other techniques only provide predictions in some a priori chosen points. As a consequence, we can compute and predict the expectation and the variance of normal and excess weight population in the region of Valencia for any time. This information is of paramount value to both doctors and health authorities to set optimal investment policies and strategies.
Ayuntamientos michoacanos: separación y sujeción de pueblos indios, 1820-1827
Juan Carlos Cortés Máximo
Tzintzun. Revista de Estudios Históricos , 2007,
Abstract:
Hardware copyleft como herramienta para la ense?anza del procesamiento de se?ales e imágenes
Camargo Bare?o,Carlos Iván; Cortés Romero,John Alexander; Jiménez Triana,Alexander;
Tecnura , 2012,
Abstract: digital signal-and-image processing is an area that covers a wide range of academic and commercial applications. it is a compulsory topic in most courses at engineering colleges. moreover, thanks to the current achievements of the semiconductor industry, it is possible to obtain specialized devices that enable the creation of commercializable products in this area. this is important in developing countries such as colombia, where the electronics industry is virtually non-existent and the country relies on products brought in from developed countries, specially from some asian countries. this paper introduces two copyleft hardware platforms that can be studied, reproduced and modified even for commercial purposes. this prepresents a tool to study signal-and-image processing as well as a starting point for the creation of technology-based companies, which should reduce the high rates of unemployed professionals in technology-related markets.
Hardware copyleft como herramienta para la ense anza del procesamiento de se ales e imágenes
Carlos Iván Camargo Bare?o,John Alexander Cortés Romero,Alexander Jiménez Triana
Tecnura , 2012,
Abstract: Digital signal-and-image processing is an area that covers a wide range of academic and commercial applications. It is a compulsory topic in most courses at engineering colleges. Moreover, thanks to the current achievements of the semiconductor industry, it is possible to obtain specialized devices that enable the creation of commercializable products in this area. This is important in developing countries such as Colombia, where the electronics industry is virtually non-existent and the country relies on products brought in from developed countries, specially from some Asian countries. This paper introduces two copyleft hardware platforms that can be studied, reproduced and modified even for commercial purposes. This prepresents a tool to study signal-and-image processing as well as a starting point for the creation of technology-based companies, which should reduce the high rates of unemployed professionals in technology-related markets.
El Corpus Christi en un pueblo de la sierra P'urhépecha. Noticia hemerográfica de la fiesta de Paracho, 1902
Juan Carlos Cortés Máximo,Gerardo Baltazar Chávez
Tzintzun. Revista de Estudios Históricos , 2010,
Abstract:
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