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Rodríguez-Valdez G, Romero-Geraldo R, Medina-Basulto G, Reyes-Becerril M, Angulo C. Immunostimulant Activity of Bacteria Isolated from Extreme Environments in Baja California Sur, Mexico: A Bioprospecting Approach. Indian J Microbiol 2022; 62:234-241. [DOI: 10.1007/s12088-022-01002-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 01/19/2022] [Indexed: 12/15/2022] Open
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Tello-Olea M, Rosales-Mendoza S, Campa-Córdova AI, Palestino G, Luna-González A, Reyes-Becerril M, Velazquez E, Hernandez-Adame L, Angulo C. Gold nanoparticles (AuNP) exert immunostimulatory and protective effects in shrimp (Litopenaeus vannamei) against Vibrio parahaemolyticus. Fish Shellfish Immunol 2019; 84:756-767. [PMID: 30368027 DOI: 10.1016/j.fsi.2018.10.056] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 10/19/2018] [Accepted: 10/22/2018] [Indexed: 06/08/2023]
Abstract
Gold nanoparticles (AuNP) stimulate immune responses in mammals but they have not been tested in species of relevance in aquaculture. In this study the immunostimulant and protective potential of orally administered AuNP against V. parahaemolyticus, the causative agent of Acute Hepatopancreatic Necrosis Disease, was determined in shrimp. Synthetized AuNP (18.57 ± 4.37 nm) were moderately dispersed with a negative ζ potential of -10.3 ± 0.208 mV (pH = 7). AuNP were administered (single dose) at 0.2, 2, and 20 μg/g feed in shrimp. Hemolymph samples were withdrawn daily for 6 days. Hemolymph or hemocytes were used to determine total hemocyte counts, immune-related enzymatic activities, and expression of immune-relevant genes. Hepatopancreas was sampled for the analysis of AuNP biodistribution and histological examination. Survival was recorded daily. No mortality or toxicity signs in hepatopancreas were found. AuNP were detected in hepatopancreas. Early (24-48 h) immunostimulation was mainly related to immune gene up-regulation. Upon a challenge with V. parahaemolyticus, survival was higher (80%) and histopathological damages were lower in shrimp treated with the 2 μg/g dose when compared to the control. Therefore orally administered AuNP are proposed as immunostimulants that protect shrimp against V. parahaemolyticus infection.
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Affiliation(s)
- M Tello-Olea
- Immunology & Vaccinology Group, Centro de Investigaciones Biológicas del Noroeste, Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, La Paz, B.C.S, 23090, Mexico
| | - S Rosales-Mendoza
- Sección de Biotecnología, Centro de Investigación en Ciencias de la Salud y Biomedicina, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava 6, SLP, 78210, Mexico
| | - A I Campa-Córdova
- Immunology & Vaccinology Group, Centro de Investigaciones Biológicas del Noroeste, Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, La Paz, B.C.S, 23090, Mexico
| | - G Palestino
- Sección de Biotecnología, Centro de Investigación en Ciencias de la Salud y Biomedicina, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava 6, SLP, 78210, Mexico
| | - A Luna-González
- Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional-Instituto Politécnico Nacional, Blvd. Juan de Dios Bátiz Paredes #250, Guasave, Sinaloa, Mexico
| | - M Reyes-Becerril
- Immunology & Vaccinology Group, Centro de Investigaciones Biológicas del Noroeste, Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, La Paz, B.C.S, 23090, Mexico
| | - E Velazquez
- Immunology & Vaccinology Group, Centro de Investigaciones Biológicas del Noroeste, Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, La Paz, B.C.S, 23090, Mexico
| | - L Hernandez-Adame
- Immunology & Vaccinology Group, Centro de Investigaciones Biológicas del Noroeste, Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, La Paz, B.C.S, 23090, Mexico; CONACyT-Centro de Investigaciones Biológicas del Noroeste, Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, La Paz, B.C.S, 23090, Mexico
| | - C Angulo
- Immunology & Vaccinology Group, Centro de Investigaciones Biológicas del Noroeste, Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, La Paz, B.C.S, 23090, Mexico.
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Villarroel-Espíndola F, Maldonado R, Mancilla H, Ramírez A, Vander K, Cereceda K, López C, Castro M, Angulo C, Slebe J, Concha I. The Many Faces of Carbohydrate Metabolism in Male Germ Cells: From Single Molecules to Active Polymers. ACTA ACUST UNITED AC 2018. [DOI: 10.32457/ijmss.2015.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Spermatogenesis is a complex physiological process that involves cell proliferation, meiotic division and a final cell differentiation of post-meiotic cells into spermatozoa. During this process male germ cells also undergo a metabolic differentiation process, in which post-meiotic spermatogenic cells (spermatids) but not meiotic spermatogenic cells (spermatocytes) respond differentially to D-glucose metabolism, glucose transporters (GLUTs) distribution and utilization of non-hexose substrates, such as lactate/pyruvate or dihydroxyacetone. These differences might be explained by the requirement for a specific metabolic process to support cell differentiation or in some cases, cell viability. In addition, though glycogen is considered to be the main glucose store, in male germ cells this polymer may play a novel role in cell proliferation, acting as a new marker for apoptotic events in testicular tissue via a yet unknown mechanism. In this article, we summarize the main metabolic changes that occur during male germ differentiation, with a specific focus on metabolic sources during spermatocyte to spermatid transition. The latter considering that these cells come from the same cell linage as specialized cells, but are not isolated from their environment, describing the roles from single molecules to polymers on the viability of male germ cells.
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Gonzalez-Abril L, Angulo C, Nuñez H, Leal Y. Handling binary classification problems with a priority class by using Support Vector Machines. Appl Soft Comput 2017. [DOI: 10.1016/j.asoc.2017.08.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Reyes-Becerril M, Alamillo E, Trasviña A, Hirono I, Kondo H, Jirapongpairoj W, Ascencio-Valle F, Angulo C. In vivo and in vitro studies using larval and adult antigens from Neobenedenia melleni on immune response in yellowtail (Seriola lalandi). J Fish Dis 2017; 40:1497-1509. [PMID: 28422295 DOI: 10.1111/jfd.12620] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 01/10/2017] [Accepted: 01/20/2017] [Indexed: 06/07/2023]
Abstract
Neobenedenia melleni is a monogenean parasite that causes significant mortality and economic losses in fish aquaculture. Changes in the antigenic composition of this parasite occur during its developmental stages. In this study, we evaluated humoral parameters in serum and transcriptional immune responses of yellowtail naturally infected with N. melleni. In addition, in vitro assays were performed to study the stimulatory effects of antigens from larvae and adults on spleen leucocytes from non-infected fish at 6 and 24 h post-stimulation. The results showed enhanced total protein, myeloperoxidase and antiprotease activities in N. melleni-infected fish compared with non-infected ones. The induction of Toll-like receptors (TLRs) and pro-inflammatory cytokines in spleen leucocytes during natural infection with N. melleni suggests that these immune-related genes play an important role in the initiation of the immune defence mechanism for controlling parasite infection. Interestingly, the magnitude of in vitro responses of spleen leucocytes was dependent on the parasitic stage. An important stimulation of gene expression by adult antigens on spleen leucocytes was observed. Differential expression patterns of TLRs and target cytokines in yellowtail leucocytes in both in vivo and in vitro studies suggest that the quality of yellowtail immune response is conditioned by N. melleni development.
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Affiliation(s)
- M Reyes-Becerril
- Immunology and Vaccinology Group, Centro de Investigaciones Biológicas del Noroeste (CIBNOR), La Paz, Mexico
| | - E Alamillo
- Immunology and Vaccinology Group, Centro de Investigaciones Biológicas del Noroeste (CIBNOR), La Paz, Mexico
| | - A Trasviña
- Immunology and Vaccinology Group, Centro de Investigaciones Biológicas del Noroeste (CIBNOR), La Paz, Mexico
| | - I Hirono
- Laboratory of Genome Science, Tokyo University of Marine Science and Technology, Tokyo, Japan
| | - H Kondo
- Laboratory of Genome Science, Tokyo University of Marine Science and Technology, Tokyo, Japan
| | - W Jirapongpairoj
- Laboratory of Genome Science, Tokyo University of Marine Science and Technology, Tokyo, Japan
| | - F Ascencio-Valle
- Immunology and Vaccinology Group, Centro de Investigaciones Biológicas del Noroeste (CIBNOR), La Paz, Mexico
| | - C Angulo
- Immunology and Vaccinology Group, Centro de Investigaciones Biológicas del Noroeste (CIBNOR), La Paz, Mexico
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Campa-Córdova AI, León-Gallo AF, Romero-Maldonado A, Ibarra-Serrano AC, Rosales-Mendoza S, Hirono I, Angulo C. Recombinant PirA-like toxin protects shrimp against challenge with Vibrio parahaemolyticus, the aetiological agent of acute hepatopancreatic necrosis disease. J Fish Dis 2017; 40:1725-1729. [PMID: 28422302 DOI: 10.1111/jfd.12625] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 02/02/2017] [Accepted: 02/03/2017] [Indexed: 06/07/2023]
Affiliation(s)
- A I Campa-Córdova
- Grupo de Inmunología & Vacunología, Centro de Investigaciones Biológicas del Noroeste, SC, Instituto Politécnico Nacional 195, La Paz, México
| | - A F León-Gallo
- Laboratorio de biofarmacéuticos recombinantes, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosi, México
| | - A Romero-Maldonado
- Laboratorio de biofarmacéuticos recombinantes, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosi, México
| | - A C Ibarra-Serrano
- Grupo de Inmunología & Vacunología, Centro de Investigaciones Biológicas del Noroeste, SC, Instituto Politécnico Nacional 195, La Paz, México
| | - S Rosales-Mendoza
- Laboratorio de biofarmacéuticos recombinantes, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, San Luis Potosi, México
| | - I Hirono
- Laboratory of Genome Science, Tokyo University of Marine Science and Technology, Minato-ku, Tokyo, Japan
| | - C Angulo
- Grupo de Inmunología & Vacunología, Centro de Investigaciones Biológicas del Noroeste, SC, Instituto Politécnico Nacional 195, La Paz, México
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Mansani L, Artioli C, Schikorr M, Rimpault G, Angulo C, Bruyn DD. The European Lead-Cooled EFIT Plant: An Industrial-Scale Accelerator-Driven System for Minor Actinide Transmutation—I. NUCL TECHNOL 2017. [DOI: 10.13182/nt11-96] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- L. Mansani
- Ansaldo Nucleare, Corso Perrone 25, 16152 Genova, Italy
| | - C. Artioli
- ENEA, Via Martiri di Monte Sole 4, 40129 Bologna, Italy
| | - M. Schikorr
- Karlsruhe Institute of Technology, Institute for Neutron Physics and Reactor Technology Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - G. Rimpault
- CEA, DEN, Cadarache, 13108 Saint Paul Lez Durance CEDEX, France
| | - C. Angulo
- Tractebel Engineering S.A., Avenue Ariane 7, 1200 Brussels, Belgium
| | - D. De Bruyn
- SCK•CEN, Boeretang 200, BR1 Building, BE-2400 Mol, Belgium
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Peralta O, Bucher D, Angulo C, Castro M, Ratto M, Concha I. Tissue localization of GM-CSF receptor in bovine ovarian follicles and its role on glucose uptake by mural granulosa cells. Anim Reprod Sci 2016; 170:157-69. [DOI: 10.1016/j.anireprosci.2016.04.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 04/25/2016] [Accepted: 04/28/2016] [Indexed: 12/16/2022]
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Gonzalez-Abril L, Nuñez H, Angulo C, Velasco F. GSVM: An SVM for handling imbalanced accuracy between classes inbi-classification problems. Appl Soft Comput 2014. [DOI: 10.1016/j.asoc.2013.12.013] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Asseng S, Ewert F, Rosenzweig C, Jones JW, Hatfield JL, Ruane AC, Boote KJ, Thorburn PJ, Rötter RP, Cammarano D, Brisson N, Basso B, Martre P, Aggarwal PK, Angulo C, Bertuzzi P, Biernath C, Challinor AJ, Doltra J, Gayler S, Goldberg R, Grant R, Heng L, Hooker J, Hunt LA, Ingwersen J, Izaurralde RC, Kersebaum KC, Müller C, Naresh Kumar S, Nendel C, O’Leary G, Olesen JE, Osborne TM, Palosuo T, Priesack E, Ripoche D, Semenov MA, Shcherbak I, Steduto P, Stöckle C, Stratonovitch P, Streck T, Supit I, Tao F, Travasso M, Waha K, Wallach D, White JW, Williams JR, Wolf J. Uncertainty in simulating wheat yields under climate change. Nature Clim Change 2013. [PMID: 0 DOI: 10.1038/nclimate1916] [Citation(s) in RCA: 267] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
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Finiti I, Leyva MO, López-Cruz J, Calderan Rodrigues B, Vicedo B, Angulo C, Bennett AB, Grant M, García-Agustín P, González-Bosch C. Functional analysis of endo-1,4-β-glucanases in response to Botrytis cinerea and Pseudomonas syringae reveals their involvement in plant-pathogen interactions. Plant Biol (Stuttg) 2013; 15:819-31. [PMID: 23528138 DOI: 10.1111/j.1438-8677.2012.00701.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Accepted: 10/10/2012] [Indexed: 05/21/2023]
Abstract
Plant cell wall modification is a critical component in stress responses. Endo-1,4-β-glucanases (EGs) take part in cell wall editing processes, e.g. elongation, ripening and abscission. Here we studied the infection response of Solanum lycopersicum and Arabidopsis thaliana with impaired EGs. Transgenic TomCel1 and TomCel2 tomato antisense plants challenged with Pseudomonas syringae showed higher susceptibility, callose priming and increased jasmonic acid pathway marker gene expression. These two EGs could be resistance factors and may act as negative regulators of callose deposition, probably by interfering with the defence-signalling network. A study of a set of Arabidopsis EG T-DNA insertion mutants challenged with P. syringae and Botrytis cinerea revealed that the lack of other EGs interferes with infection phenotype, callose deposition, expression of signalling pathway marker genes and hormonal balance. We conclude that a lack of EGs could alter plant response to pathogens by modifying the properties of the cell wall and/or interfering with signalling pathways, contributing to generate the appropriate signalling outcomes. Analysis of microarray data demonstrates that EGs are differentially expressed upon many different plant-pathogen challenges, hormone treatments and many abiotic stresses. We found some Arabidopsis EG mutants with increased tolerance to osmotic and salt stress. Our results show that impairing EGs can alter plant-pathogen interactions and may contribute to appropriate signalling outcomes in many different biotic and abiotic plant stress responses.
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Affiliation(s)
- I Finiti
- Departamento de Bioquímica y Biología Molecular, Universidad de Valencia, IATA (CSIC), Valencia, Spain
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Angulo C, Bogusch E, Bredimas A, Delannay N, Viala C, Ruer J, Muguerra P, Sibaud E, Chauvet V, Hittner D, Fütterer M, de Groot S, von Lensa W, Verfondern K, Moron R, Baudrand O, Griffay G, Baaten A, Segurado-Gimenez J. EUROPAIRS: The European project on coupling of High Temperature Reactors with industrial processes. Nuclear Engineering and Design 2012. [DOI: 10.1016/j.nucengdes.2011.12.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Dalouzy JC, Achouri L, Aliotta M, Angulo C, Benhabiles H, Borcea C, Borcea R, Bourgault P, Buta A, Coc A, Damman A, Davinson T, de Grancey F, de Oliveira Santos F, de Séréville N, Kiener J, Pellegriti MG, Negoita F, Sánchez-Benítez AM, Sorlin O, Stanoiu M, Stefan I, Woods PJ. Discovery of a new broad resonance in 19Ne: implications for the destruction of the cosmic gamma-ray emitter 18F. Phys Rev Lett 2009; 102:162503. [PMID: 19518704 DOI: 10.1103/physrevlett.102.162503] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Indexed: 05/27/2023]
Abstract
Six proton-emitting states in 19Ne were studied through the inelastic scattering reaction H(19Ne,p);{19}Ne; (p)18F. Their energies and widths were derived from the protons detected at zero degree, while proton-proton angular correlations between the detector at zero degree and a segmented annular detector were used to determine their spin value. In addition to the known states, a new broad J=1/2 resonance has been evidenced at E_{x} approximately 7.9 MeV, approximately 1.45 MeV above the proton emission threshold. By introducing this resonance, the 18F(p,alpha)15O destruction rate in novae is significantly enhanced. This reduces the chance to observe the cosmic gamma-ray emission of 18F from novae in space telescopes.
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Affiliation(s)
- J C Dalouzy
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, B.P. 55027, F-14076 Caen Cedex 5, France
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Ventura M, Sanchez-Niubo A, Ruiz F, Agell N, Ventura R, Angulo C, Domingo-Salvany A, Segura J, Torre RDL. Qualitative evaluation of chromatographic data from quality control schemes using a support vector machine. Analyst 2008; 133:105-11. [DOI: 10.1039/b711653p] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Téllez R, Angulo C. Webots Simulator 5.1.7. Developed and supported by Cyberbotics Ltd. (2006). Artif Life 2007; 13:313-8. [PMID: 17567251 DOI: 10.1162/artl.2007.13.3.313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Affiliation(s)
- R Téllez
- Technical University of Catalonia, Rambla del'Exposició s/n E-08800 Vilanova i la Geltrú, Barcelona, Spain.
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Freer M, Casarejos E, Achouri L, Angulo C, Ashwood NI, Curtis N, Demaret P, Harlin C, Laurent B, Milin M, Orr NA, Price D, Raabe R, Soić N, Ziman VA. Alpha:2n:alpha molecular band in 10Be. Phys Rev Lett 2006; 96:042501. [PMID: 16486811 DOI: 10.1103/physrevlett.96.042501] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2005] [Indexed: 05/06/2023]
Abstract
The 10.15 MeV resonance in 10Be has been probed via resonant 6He+4He elastic scattering. It is demonstrated that it is the Jpi=4+ member of a rotational band built on the 6.18 MeV 0+ state. A Gammaalpha of 0.10-0.13 MeV and Gammaalpha/Gamma=0.35-0.46 were deduced. The corresponding reduced alpha width, gamma2alpha, indicates one of the largest alpha-cluster spectroscopic factors known. The deformation of the band, including the 7.54 MeV, 2+ member, is large (h2/2I=200 keV). Such a deformation and the significant degree of clusterization signals a well-developed alpha:2n:alpha molecular structure.
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Affiliation(s)
- M Freer
- School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
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Runkle RC, Champagne AE, Angulo C, Fox C, Iliadis C, Longland R, Pollanen J. Direct measurement of the 14N(p,gamma)15O S factor. Phys Rev Lett 2005; 94:082503. [PMID: 15783885 DOI: 10.1103/physrevlett.94.082503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2004] [Indexed: 05/24/2023]
Abstract
The 14N(p,gamma)15O reaction regulates the rate of energy generation in the stellar CN cycle. Because discrepancies have been found in the analysis and interpretation of previous capture data, we have measured the 14N(p,gamma)15O excitation function for energies in the range E(lab)(p)=155-524 keV. Fits of these data using R-matrix theory yield a value for the S factor at zero energy of 1.68+/-0.09(stat)+/-0.16(syst) keV b, which is significantly smaller than the previous result. The corresponding reduction in the stellar reaction rate for 14N(p,gamma)15O has a number of interesting consequences, including an impact on estimates for the age of the Galaxy derived from globular clusters.
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Affiliation(s)
- R C Runkle
- The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255, USA
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Golovkov MS, Grigorenko LV, Fomichev AS, Krupko SA, Oganessian YT, Rodin AM, Sidorchuk SI, Slepnev RS, Stepantsov SV, Ter-Akopian GM, Wolski R, Itkis MG, Bogatchev AA, Kondratiev NA, Kozulin EM, Korsheninnikov AA, Nikolskii EY, Roussel-Chomaz P, Mittig W, Palit R, Bouchat V, Kinnard V, Materna T, Hanappe F, Dorvaux O, Stuttgé L, Angulo C, Lapoux V, Raabe R, Nalpas L, Yukhimchuk AA, Perevozchikov VV, Vinogradov YI, Grishechkin SK, Zlatoustovskiy SV. Observation of excited states in 5H. Phys Rev Lett 2004; 93:262501. [PMID: 15697971 DOI: 10.1103/physrevlett.93.262501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2004] [Indexed: 05/24/2023]
Abstract
The 5H system was produced in the 3H(t,p)5H reaction studied with a 58 MeV tritium beam at small c.m. angles. High statistics data were used to reconstruct the energy and angular correlations between the 5H decay fragments. A broad structure in the 5H missing mass spectrum showing up above 2.5 MeV was identified as a mixture of the 3/2+ and 5/2+ states. The data also present evidence that the 1/2+ ground state of 5H is located at about 2 MeV.
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Affiliation(s)
- M S Golovkov
- Flerov Laboratory of Nuclear Reactions, JINR, Dubna, RU-141980 Russia
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Raabe R, Sida JL, Charvet JL, Alamanos N, Angulo C, Casandjian JM, Courtin S, Drouart A, Durand DJC, Figuera P, Gillibert A, Heinrich S, Jouanne C, Lapoux V, Lepine-Szily A, Musumarra A, Nalpas L, Pierroutsakou D, Romoli M, Rusek K, Trotta M. No enhancement of fusion probability by the neutron halo of 6He. Nature 2004; 431:823-6. [PMID: 15483606 DOI: 10.1038/nature02984] [Citation(s) in RCA: 148] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2004] [Accepted: 09/03/2004] [Indexed: 11/09/2022]
Abstract
Quantum tunnelling through a potential barrier (such as occurs in nuclear fusion) is very sensitive to the detailed structure of the system and its intrinsic degrees of freedom. A strong increase of the fusion probability has been observed for heavy deformed nuclei. In light exotic nuclei such as 6He, 11Li and 11Be (termed 'halo' nuclei), the neutron matter extends much further than the usual nuclear interaction scale. However, understanding the effect of the neutron halo on fusion has been controversial--it could induce a large enhancement of fusion, but alternatively the weak binding energy of the nuclei could inhibit the process. Other reaction channels known as direct processes (usually negligible for ordinary nuclei) are also important: for example, a fragment of the halo nucleus could transfer to the target nucleus through a diminished potential barrier. Here we study the reactions of the halo nucleus 6He with a 238U target, at energies near the fusion barrier. Most of these reactions lead to fission of the system, which we use as an experimental signature to identify the contribution of the fusion and transfer channels to the total cross-section. At energies below the fusion barrier, we find no evidence for a substantial enhancement of fusion. Rather, the (large) fission yield is due to a two-neutron transfer reaction, with other direct processes possibly also involved.
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Affiliation(s)
- R Raabe
- DSM/DAPNIA, CEA Saclay, F-91191 Gif sur Yvette Cedex, France.
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González L, Angulo C, Velasco F, Vilches M. Probabilistic outputs for a new multi-class Support Vector Machine. Int Artif 2002. [DOI: 10.4114/ia.v6i17.735] [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: 11/20/2022] Open
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25
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Parra X, Angulo C, Agell N, Rovira X. Aproximacion a un problema financiero mediante redes neuronales con funciones base radiales y maquinas de soporte vectorial. Int Artif 2001. [DOI: 10.4114/ia.v5i14.760] [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: 11/20/2022] Open
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26
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Hammache F, Bogaert G, Aguer P, Angulo C, Barhoumi S, Brillard L, Chemin JF, Claverie G, Coc A, Hussonnois M, Jacotin M, Kiener J, Lefebvre A, Le Naour C, Ouichaoui S, Scheurer JN, Tatischeff V, Thibaud JP, Virassamynaïken E. Low-energy measurement of the 7Be(p,gamma)8B cross section. Phys Rev Lett 2001; 86:3985-3988. [PMID: 11328076 DOI: 10.1103/physrevlett.86.3985] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2000] [Indexed: 05/23/2023]
Abstract
We have measured the cross section of the 7Be(p,gamma)8B reaction for E(c.m.) = 185.8, 134.7, and 111.7 keV using a radioactive 7Be target (132 mCi). Single and coincidence spectra of beta+ and alpha particles from 8B and 8Be* decay, respectively, were measured using a large acceptance spectrometer. The zero energy S factor inferred from these data is 18.5+/-2.4 eV b and a weighted mean value of 18.8+/-1.7 eV b (theoretical uncertainty included) is deduced when combining this value with our previous results at higher energies.
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Affiliation(s)
- F Hammache
- CSNSM, IN2P3-CNRS, F-91405 Orsay et Université de Paris-Sud, France
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27
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Córdoba C, Aguirre de Cárcer I, Pérez A, Sanz A, Angulo C, Vila P, Monroy E, Muñoz E, Jaque F. UV-B irradiance at Madrid during 1996, 1997, and 1998. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999jd900253] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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28
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Angulo C, Rauch MC, Droppelmann A, Reyes AM, Slebe JC, Delgado-López F, Guaiquil VH, Vera JC, Concha II. Hexose transporter expression and function in mammalian spermatozoa: cellular localization and transport of hexoses and vitamin C. J Cell Biochem 1998; 71:189-203. [PMID: 9779818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
We analyzed the expression of hexose transporters in human testis and in human, rat, and bull spermatozoa and studied the uptake of hexoses and vitamin C in bull spermatozoa. Immunocytochemical and reverse transcription-polymerase chain reaction analyses demonstrated that adult human testis expressed the hexose transporters GLUT1, GLUT2, GLUT3, GLUT4, and GLUT5. Immunoblotting experiments demonstrated the presence of proteins of about 50-70 kD reactive with anti-GLUT1, GLUT2, GLUT3, and GLUT5 in membranes prepared from human spermatozoa, but no proteins reactive with GLUT4 antibodies were detected. Immunolocalization experiments confirmed the presence of GLUT1, GLUT2, GLUT3, GLUT5, and low levels of GLUT4 in human, rat, and bull spermatozoa. Each transporter isoform showed a typical subcellular localization in the head and the sperm tail. In the tail, GLUT3 and GLUT5 were present at the level of the middle piece in the three species examined, GLUT1 was present in the principal piece, and the localization of GLUT2 differed according of the species examined. Bull spermatozoa transported deoxyglucose, fructose, and the oxidized form of vitamin C, dehydroascorbic acid. Transport of deoxyglucose and dehydroascorbic acid was inhibited by cytochalasin B, indicating the direct participation of facilitative hexose transporters in the transport of both substrates by bull spermatozoa. Transport of fructose was not affected by cytochalasin B, which is consistent for an important role for GLUT5 in the transport of fructose in these cells. The data show that human, rat, and bull spermatozoa express several hexose transporter isoforms that allow for the efficient uptake of glucose, fructose, and dehydroascorbic acid by these cells.
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Affiliation(s)
- C Angulo
- Instituto de Bioquímica, Facultad de Ciencias, Universidad Austral de Chile, Valdivia
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Monroy E, Calle F, Angulo C, Vila P, Sanz A, Garrido JA, Calleja E, M Oz E, Haffouz S, Beaumont B, Omnes F, Gibart P. GaN-Based Solar-Ultraviolet Detection Instrument. Appl Opt 1998; 37:5058-5062. [PMID: 18285975 DOI: 10.1364/ao.37.005058] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We report on the fabrication of a solar-UV monitoring system that uses GaN-based photodetectors. GaN photoconductors, p-n junction photodiodes, and Schottky barrier photodiodes have been fabricated and characterized as UV sensors. The best performances are obtained in Schottky photodiodes, which show a linear response, a flat responsivity of 100 mA/W, a visible rejection ratio higher than 10(3), and a noise-equivalent power of 1 nW/Hz(-1/2). Preliminary data on Al(x)Ga(1-x)N (x = 0.15, 0.22) detectors are also presented. Using GaN Schottky diodes, we fabricate and evaluate a complete solar-UV detection head.
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Concha II, Velásquez FV, Martínez JM, Angulo C, Droppelmann A, Reyes AM, Slebe JC, Vera JC, Golde DW. Human erythrocytes express GLUT5 and transport fructose. Blood 1997; 89:4190-5. [PMID: 9166863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Although erythrocytes readily metabolize fructose, it has not been known how this sugar gains entry to the red blood cell. We present evidence indicating that human erythrocytes express the fructose transporter GLUT5, which is the major means for transporting fructose into the cell. Immunoblotting and immunolocalization experiments identified the presence of GLUT1 and GLUT5 as the main facilitative hexose transporters expressed in human erythrocytes, with GLUT2 present in lower amounts. Functional studies allowed the identification of two transporters with different kinetic properties involved in the transport of fructose in human erythrocytes. The predominant transporter (GLUT5) showed an apparent Km for fructose of approximately 10 mmol/L. Transport of low concentrations of fructose was not affected by 2-deoxy-D-glucose, a glucose analog that is transported by GLUT1 and GLUT2. Similarly, cytochalasin B, a potent inhibitor of the functional activity of GLUT1 and GLUT2, did not affect the transport of fructose in human erythrocytes. The functional properties of the fructose transporter present in human erythrocytes are consistent with a central role for GLUT5 as the physiological transporter of fructose in these cells.
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Affiliation(s)
- I I Concha
- Instituto de Bioquímica, Facultad de Ciencias, Universidad Austral de Chile, Valdivia
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Engstler S, Raimann G, Angulo C, Greife U, Rolfs C, Schr�der U, Somorjai E, Kirch B, Langanke K. Isotopic dependence of electron screening in fusion reactions. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf01294958] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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