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Martínez-Sánchez L, López-Ávila J, Barasoain-Millán A, Angelats-Romero CM, Azkunaga-Santibañez B, Molina-Cabañero JC, Alday A, Andrés A, Angelats C, Aquino E, Astete J, Baena I, Barasoain A, Bello P, Benito C, Benito H, Botifoll E, Burguera B, Campos C, Canduela V, Clerigué N, Comalrena C, Del Campo T, De Miguel B, Fernández R, Fernández B, García E, García M, García M, García M, García-Vao C, Herrero L, Huerta P, Humayor J, Hurtado P, Iturralde I, Jordá A, Khodayar P, Lalinde M, Lobato Z, López J, López V, Luaces C, Mangione L, Martín L, Martínez S. L, Martínez L, Martorell J, May M, Melguizo M, Mesa S, Molina J, Muñiz M, Muñoz J, Muñoz N, Oliva S, Palacios M, Pérez A, Pérez C, Pinyot M, Peñalba A, Pociello N, Rodríguez A, Rodríguez M, Señer R, Serrano I, Vázquez P, Vidal C. Actions that should not be taken with a paediatric patient who has been exposed to a potentially toxic substance. An Pediatr (Barc) 2021. [DOI: 10.1016/j.anpede.2020.07.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Mesa S, Arboleda J, Echavarría A, López-Suárez F. Ferrierite zeolite passivation and its catalytic application in toluene disproportionation. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.08.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Pineda Zapata JA, Delgado de Bedout JA, Rascovsky Ramírez S, Bustamante C, Mesa S, Calvo Betancur VD. A practical introduction to the hemodynamic analysis of the cardiovascular system with 4D Flow MRI. Radiologia 2014; 56:485-95. [PMID: 25447368 DOI: 10.1016/j.rx.2014.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 08/12/2014] [Accepted: 08/14/2014] [Indexed: 11/28/2022]
Abstract
The 4D Flow MRI technique provides a three-dimensional representation of blood flow over time, making it possible to evaluate the hemodynamics of the cardiovascular system both qualitatively and quantitatively. In this article, we describe the application of the 4D Flow technique in a 3T scanner; in addition to the technical parameters, we discuss the advantages and limitations of the technique and its possible clinical applications. We used 4D Flow MRI to study different body areas (chest, abdomen, neck, and head) in 10 volunteers. We obtained 3D representations of the patterns of flow and quantitative hemodynamic measurements. The technique makes it possible to evaluate the pattern of blood flow in large and midsize vessels without the need for exogenous contrast agents.
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Affiliation(s)
- J A Pineda Zapata
- Grupo de Investigación, Instituto de Alta Tecnología Médica (IATM), Medellín, Antioquia, Colombia.
| | - J A Delgado de Bedout
- Grupo de Investigación, Instituto de Alta Tecnología Médica (IATM), Medellín, Antioquia, Colombia
| | - S Rascovsky Ramírez
- Grupo de Investigación, Instituto de Alta Tecnología Médica (IATM), Medellín, Antioquia, Colombia
| | - C Bustamante
- Grupo de Investigación, Instituto de Alta Tecnología Médica (IATM), Medellín, Antioquia, Colombia
| | - S Mesa
- Universidad CES, Medellín, Antioquia, Colombia
| | - V D Calvo Betancur
- Grupo de Investigación, Instituto de Alta Tecnología Médica (IATM), Medellín, Antioquia, Colombia
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Pineda Zapata J, Delgado de Bedout J, Rascovsky Ramírez S, Bustamante C, Mesa S, Calvo Betancur V. A practical introduction to the hemodynamic analysis of the cardiovascular system with 4D Flow MRI. Radiología (English Edition) 2014. [DOI: 10.1016/j.rxeng.2014.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Silva J, Mesa S. W042 EXPECTANT MANAGEMENT IN A PREGNANT PATIENT HIV POSITIVE WITH RUPTURED MEMBRANE LONG BEFORE TERM. Int J Gynaecol Obstet 2012. [DOI: 10.1016/s0020-7292(12)61768-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Abstract
In Bradyrhizobium japonicum, the nitrogen-fixing soya bean endosymbiont and facultative denitrifier, three CRP (cAMP receptor protein)/FNR (fumarate and nitrate reductase regulatory protein)-type transcription factors [FixK1, FixK2 and NnrR (nitrite and nitric oxide reductase regulator)] have been studied previously in the context of the regulation of nitrogen fixation and denitrification. The gene expression of both fixK1 and nnrR depends on FixK2, which acts as a key distributor of the ‘low-oxygen’ signal perceived by the two-component regulatory system FixLJ. While the targets for FixK1 are not known, NnrR transduces the nitrogen oxide signal to the level of denitrification gene expression. Besides these three regulators, the complete genome sequence of this organism has revealed the existence of 13 additional CRP/FNR-type proteins whose functions have not yet been studied. Based on sequence similarity and phylogenetic analysis, we discuss in this paper the peculiarities of these additional factors.
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Affiliation(s)
- S Mesa
- Institute of Microbiology, Eidgenössische Technische Hochschule, CH-8093 Zürich, Switzerland.
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Velasco L, Mesa S, Delgado MJ, Bedmar EJ. Characterization of the nirK gene encoding the respiratory, Cu-containing nitrite reductase of Bradyrhizobium japonicum. Biochim Biophys Acta 2001; 1521:130-4. [PMID: 11690645 DOI: 10.1016/s0167-4781(01)00279-2] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The structural gene, nirK, for the respiratory Cu-containing nitrite reductase from Bradyrhizobium japonicum USDA110 has been isolated and sequenced. The deduced amino acid sequence exhibited a high degree of similarity to other Cu-containing nitrite reductases from various sources. The full-length protein included a signal peptide for protein export. Analysis of the sequence upstream from the structural nirK gene revealed the presence of an anaerobox located 83 base pairs from the putative translational start codon. Cells of strain GRK308, a nitrite reductase-deficient derivative of strain USDA110, were unable to grow when cultured under microaerobic conditions (1% O(2)) in the presence of either nitrate or nitrite. Maximal expression of a nirK-lacZ fusion in strain USDA110 required simultaneously both low level oxygen conditions and the presence of nitrate. Expression of beta-galactosidase activity was not detected in the B. japonicum fixL 7403, fixJ 7360 and fixK(2) 9043 mutants transformed with the nirK-lacZ fusion after incubation of the cells under oxygen-limiting conditions either with or without nitrate. Complementation of B. japonicum 9043 with the fixK(2) gene restored beta-galactosidase activity to levels similar to those found in the parental strain. These results suggest that nirK expression depends on the low-oxygen-responsive two-component regulatory system FixLJ and on the Fnr/FixK-like DNA binding protein FixK(2).
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Affiliation(s)
- L Velasco
- Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, CSIC, P.O. Box 419, 18080-, Granada, Spain
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Mesa S, Göttfert M, Bedmar EJ. The nir, nor, and nos denitrification genes are dispersed over the Bradyrhizobium japonicum chromosome. Arch Microbiol 2001; 176:136-42. [PMID: 11479713 DOI: 10.1007/s002030100305] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2000] [Accepted: 05/07/2001] [Indexed: 10/27/2022]
Abstract
Cleavage of genomic DNA from Bradyrhizobium japonicum strain 3I1b110 by the restriction enzymes PmeI, PacI, and SwaI has been used together with pulsed-field gel electrophoresis and Southern hybridization to locate the nirK, norCBQD, and nosRZDFYLX denitrification genes on the chromosomal map of B. japonicum strain 110spc4. Mutant strains GRK13, GRC131, and GRZ25 were obtained by insertion of plasmid pUC4-KIXX-aphII-PSP, which carries recognition sites for the enzymes PacI, PmeI and SwaI, into the B. japonicum 3I1b110 nirK, norC and nosZ genes, respectively. Restriction of strain 3I1b110 genomic DNA with PacI, PmeI and SwaI yielded three, five and nine fragments, respectively. Pulsed-field gel electrophoresis of restricted mutant DNAs resulted in an altered fragment pattern that allowed determination of the position of the selected genes. Complementary mapping data were obtained by hybridization using digoxigenin-labeled B. japonicum 3I1b110 nirK, norBQD and nosZD as gene probes. The nirK, norCBQD and nosRZDFYLX genes were located close to the groEL(2), cycH and cycVWX genes, respectively, on the strain 110spc4 genetic map. In contrast to other denitrifiers, B. japonicum 3I1b110 denitrification genes were dispersed over the entire chromosome.
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Affiliation(s)
- S Mesa
- Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, CSIC, PO Box 419, 18080 Granada, Spain
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