The aging of population at the world level requires more research from different areas, with ergo... more The aging of population at the world level requires more research from different areas, with ergonomics playing an important role due to its multidisciplinary character.
AIAA 2021-0356 (ARC - Aerospace Research Central), Jan 4, 2021
1 As humanity seeks outposts on other planetary bodies such as the Moon and Mars, technology must... more 1 As humanity seeks outposts on other planetary bodies such as the Moon and Mars, technology must enable safe, repeated landings and launches near habitation. The design of the Lunar Plume Al leviation Device (Lunar PAD) aims to mitigate plume impingement and abrasive regolith debris and protect the crew, lander, and surroundings. Key vent features have been designed to provide both structural support and a controlled exhaust flow, and their basic function has been analyzed via finite element analysis (FEA) and computational fluid dynamics (CFD) simulations. A subscale Lunar PAD model has been completed in October of 2020 that demonstrates its ability to be 3D printed. The Lunar PAD uses in-situ resource utilization (ISRU) methods and technologies to minimize launch mass and enable previously unimagined structures. The lessons from this work can be applied to the design, manufacturing, and testing of future full-scale landing pads. Together with future landing system developments, a...
The simultaneous adsorption of quinoline and 4,6-dimethyldibenzothiophene over adsorbents, based ... more The simultaneous adsorption of quinoline and 4,6-dimethyldibenzothiophene over adsorbents, based on alumina modified with boron and nickel under ambient temperature and pressure, was studied. The adsorbents were characterized by BET specific surface area, a potentiometric method for the determination of acid strength, electrophoretic migration, and X-ray diffraction. The results showed that the adsorbent containing nickel had better adsorption capacity than the adsorbent modified with nickel and boron, which was attributed to its greater acidity and ability to generate π-complexation between the adsorbent and the molecules. In terms of selectivity, quinoline was more adsorbed than 4,6-dimethyldibenzothiophene in all systems, due to the basic nature of quinoline. The experimental data in all cases were adjusted by three kinetic models (Yoon–Nelson, Yan and Thomas), and the regression coefficients in all models were close to one. Finally, the values of the kinetic constant obtained by...
41 Localización y ciclo de vida: dos conceptos recíprocos frente a la empresa Mariluz García Sala... more 41 Localización y ciclo de vida: dos conceptos recíprocos frente a la empresa Mariluz García Salazar Diana Marcela Restrepo Madrid Salvador Velásquez Saldarriaga Síntesis La entrada de empresas de la industria met-almecánica ha representado un hecho im-portante ...
Universidad Colegio Mayor Nuestra Senora Del Rosario Universidad Del Rosario Edocur Repositorio Institucional Disponible En Http Repository Urosario Edu Co, May 1, 2014
Universidad Colegio Mayor Nuestra Senora Del Rosario Universidad Del Rosario Edocur Repositorio Institucional Disponible En Http Repository Urosario Edu Co, Jan 15, 2014
... Inevitably, a survey of this type provokes a number of generalizations. ... read the sentimen... more ... Inevitably, a survey of this type provokes a number of generalizations. ... read the sentimental romancesge-nealogically, historically, politically, narratologically, culturallythey face a daunting task ... Yet, if Whinnom's bibliography shows that easy solutions are not at hand, at least ...
ABSTRACT This study presents the results obtained from the analysis of the pollen record from two... more ABSTRACT This study presents the results obtained from the analysis of the pollen record from two cores obtained from different sites at Boca Chavica in the San Juan River delta on the Pacific coast of Colombia. The sequence of changes in the vegetation during the late Holocene, which was probably determined by local processes associated with fluvio-marine dynamics, was documented. In the core from San Juan 15, there was a gradual substitution of freshwater swamp vegetation with transitional and mangrove elements. In the San Juan 8 core, mangrove forest elements were gradually replaced by tropical rain forest vegetation due to accumulation of sediments wich isolated the site from influences of the sea and main channel of the river. Although there was no lithological evidence of subsidence of tectonic origin, wich might explain the shifts in environmental gradients, the possibility that the site was siesmically affected and subjected to subsidence, marine inundation, and salination of the substrate, cannot be rejected. In order to corroborate the results obtained from the interpretation of the pollen diagrams, the statistic methods of ordenation and data clustering were used. Correspondence analysis showed that the two first ordination axes for the San Juan 15 core explained 40% of the total variation of taxa, coinciding with the pollen zones identified in the diagrams. The two first ordination axes obtained for the San Juan 8 section only explained the 29.43% of the total variation of elements, indicating a low reliability of the analysis.
The pyridine nucleotide cycle is a network of salvage and recycling routes maintaining homeostasi... more The pyridine nucleotide cycle is a network of salvage and recycling routes maintaining homeostasis of NAD(P) cofactor pool in the cell. Nicotinamide mononucleotide (NMN) deamidase (EC 3.5.1.42), one of the key enzymes of the bacterial pyridine nucleotide cycle, was originally described in Enterobacteria, but the corresponding gene eluded identification for over 30 years. A genomics-based reconstruction of NAD metabolism across hundreds of bacterial species suggested that NMN deamidase reaction is the only possible way of nicotinamide salvage in the marine bacterium Shewanella oneidensis. This prediction was verified via purification of native NMN deamidase from S. oneidensis followed by the identification of the respective gene, termed pncC. Enzymatic characterization of the PncC protein, as well as phenotype analysis of deletion mutants, confirmed its proposed biochemical and physiological function in S. oneidensis. Of the three PncC homologs present in Escherichia coli, NMN deamidase activity was confirmed only for the recombinant purified product of the ygaD gene. A comparative analysis at the level of sequence and three-dimensional structure, which is available for one of the PncC family member, shows no homology with any previously described amidohydrolases. Multiple alignment analysis of functional and nonfunctional PncC homologs, together with NMN docking experiments, allowed us to tentatively identify the active site area and conserved residues therein. An observed broad phylogenomic distribution of predicted functional PncCs in the bacterial kingdom is consistent with a possible role in detoxification of NMN, resulting from NAD utilization by DNA ligase.
The aging of population at the world level requires more research from different areas, with ergo... more The aging of population at the world level requires more research from different areas, with ergonomics playing an important role due to its multidisciplinary character.
AIAA 2021-0356 (ARC - Aerospace Research Central), Jan 4, 2021
1 As humanity seeks outposts on other planetary bodies such as the Moon and Mars, technology must... more 1 As humanity seeks outposts on other planetary bodies such as the Moon and Mars, technology must enable safe, repeated landings and launches near habitation. The design of the Lunar Plume Al leviation Device (Lunar PAD) aims to mitigate plume impingement and abrasive regolith debris and protect the crew, lander, and surroundings. Key vent features have been designed to provide both structural support and a controlled exhaust flow, and their basic function has been analyzed via finite element analysis (FEA) and computational fluid dynamics (CFD) simulations. A subscale Lunar PAD model has been completed in October of 2020 that demonstrates its ability to be 3D printed. The Lunar PAD uses in-situ resource utilization (ISRU) methods and technologies to minimize launch mass and enable previously unimagined structures. The lessons from this work can be applied to the design, manufacturing, and testing of future full-scale landing pads. Together with future landing system developments, a...
The simultaneous adsorption of quinoline and 4,6-dimethyldibenzothiophene over adsorbents, based ... more The simultaneous adsorption of quinoline and 4,6-dimethyldibenzothiophene over adsorbents, based on alumina modified with boron and nickel under ambient temperature and pressure, was studied. The adsorbents were characterized by BET specific surface area, a potentiometric method for the determination of acid strength, electrophoretic migration, and X-ray diffraction. The results showed that the adsorbent containing nickel had better adsorption capacity than the adsorbent modified with nickel and boron, which was attributed to its greater acidity and ability to generate π-complexation between the adsorbent and the molecules. In terms of selectivity, quinoline was more adsorbed than 4,6-dimethyldibenzothiophene in all systems, due to the basic nature of quinoline. The experimental data in all cases were adjusted by three kinetic models (Yoon–Nelson, Yan and Thomas), and the regression coefficients in all models were close to one. Finally, the values of the kinetic constant obtained by...
41 Localización y ciclo de vida: dos conceptos recíprocos frente a la empresa Mariluz García Sala... more 41 Localización y ciclo de vida: dos conceptos recíprocos frente a la empresa Mariluz García Salazar Diana Marcela Restrepo Madrid Salvador Velásquez Saldarriaga Síntesis La entrada de empresas de la industria met-almecánica ha representado un hecho im-portante ...
Universidad Colegio Mayor Nuestra Senora Del Rosario Universidad Del Rosario Edocur Repositorio Institucional Disponible En Http Repository Urosario Edu Co, May 1, 2014
Universidad Colegio Mayor Nuestra Senora Del Rosario Universidad Del Rosario Edocur Repositorio Institucional Disponible En Http Repository Urosario Edu Co, Jan 15, 2014
... Inevitably, a survey of this type provokes a number of generalizations. ... read the sentimen... more ... Inevitably, a survey of this type provokes a number of generalizations. ... read the sentimental romancesge-nealogically, historically, politically, narratologically, culturallythey face a daunting task ... Yet, if Whinnom's bibliography shows that easy solutions are not at hand, at least ...
ABSTRACT This study presents the results obtained from the analysis of the pollen record from two... more ABSTRACT This study presents the results obtained from the analysis of the pollen record from two cores obtained from different sites at Boca Chavica in the San Juan River delta on the Pacific coast of Colombia. The sequence of changes in the vegetation during the late Holocene, which was probably determined by local processes associated with fluvio-marine dynamics, was documented. In the core from San Juan 15, there was a gradual substitution of freshwater swamp vegetation with transitional and mangrove elements. In the San Juan 8 core, mangrove forest elements were gradually replaced by tropical rain forest vegetation due to accumulation of sediments wich isolated the site from influences of the sea and main channel of the river. Although there was no lithological evidence of subsidence of tectonic origin, wich might explain the shifts in environmental gradients, the possibility that the site was siesmically affected and subjected to subsidence, marine inundation, and salination of the substrate, cannot be rejected. In order to corroborate the results obtained from the interpretation of the pollen diagrams, the statistic methods of ordenation and data clustering were used. Correspondence analysis showed that the two first ordination axes for the San Juan 15 core explained 40% of the total variation of taxa, coinciding with the pollen zones identified in the diagrams. The two first ordination axes obtained for the San Juan 8 section only explained the 29.43% of the total variation of elements, indicating a low reliability of the analysis.
The pyridine nucleotide cycle is a network of salvage and recycling routes maintaining homeostasi... more The pyridine nucleotide cycle is a network of salvage and recycling routes maintaining homeostasis of NAD(P) cofactor pool in the cell. Nicotinamide mononucleotide (NMN) deamidase (EC 3.5.1.42), one of the key enzymes of the bacterial pyridine nucleotide cycle, was originally described in Enterobacteria, but the corresponding gene eluded identification for over 30 years. A genomics-based reconstruction of NAD metabolism across hundreds of bacterial species suggested that NMN deamidase reaction is the only possible way of nicotinamide salvage in the marine bacterium Shewanella oneidensis. This prediction was verified via purification of native NMN deamidase from S. oneidensis followed by the identification of the respective gene, termed pncC. Enzymatic characterization of the PncC protein, as well as phenotype analysis of deletion mutants, confirmed its proposed biochemical and physiological function in S. oneidensis. Of the three PncC homologs present in Escherichia coli, NMN deamidase activity was confirmed only for the recombinant purified product of the ygaD gene. A comparative analysis at the level of sequence and three-dimensional structure, which is available for one of the PncC family member, shows no homology with any previously described amidohydrolases. Multiple alignment analysis of functional and nonfunctional PncC homologs, together with NMN docking experiments, allowed us to tentatively identify the active site area and conserved residues therein. An observed broad phylogenomic distribution of predicted functional PncCs in the bacterial kingdom is consistent with a possible role in detoxification of NMN, resulting from NAD utilization by DNA ligase.
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