Browsing by Author "Godoy, A."
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- ItemCagA antibodies as a marker of virulence in Chilean patients with Helicobacter pylori infection(2003) Harris, Paul R.; Godoy, A.; Arenillas, S.; Riera, F.; Garcia, D.; Einisman, H.; Pena, A.; Rollan, T.; Duarte, I.; Guiraldes, E.; Perez-Perez, G.Background: The bacterial and host factors that influence the clinical outcomes of the Helicobacter pylori infection have not been fully identified. Cytotoxin-associated gene product (CagA), one of the virulence factors, has been associated with a more aggressive form of infection. The authors studied the relationship between CagA status and clinical outcome in Chilean children and adults with H. pylori infection. Methods: One hundred eighty consecutive patients undergoing upper gastrointestinal endoscopic analysis were enrolled after informed consent was obtained. Rapid urease test and histologic analysis were used to detect H. pylori infection. IgA and IgG antibodies to H. pylori whole cell antigen preparation and IgG antibodies to CagA were measured by enzyme-linked immunosorbent assay (ELISA). Results: H. pylori infection was detected in 42% of the patients by biopsy or urease test and in 38% and 20% of patients by IgG and IgA antibodies, respectively. The prevalence of H. Pylori either by the invasive or the serologic tests was directly related to patient age. Among patients with H. pylori, there was no significant association between age and prevalence of CagA. Nearly 70% of the patients with H. pylori and peptic ulcer disease had CagA-positive strains. In contrast, only 49% of the patients with chronic gastritis alone had CagA-positive strains (P < 0.05). Conclusions: In Chile, patients infected with H. pylori have a proportion of CagA-positive strains similar to that reported in developed countries. CagA prevalence was not significantly different in adults and children infected with H. pylori, suggesting that variations in clinical outcome may be related to host immune or environmental factors.
- ItemPoly(p-phenylene-diselenocarbonate) and poly(p-phenylene-diselenothiocarbonate) : New semiconducting polymers(1996) Díaz, Alzamora, Fernando Raúl; Godoy, A.; Tagle Domínguez, Luis Hernán; Valdebenito, N.; Bernède, J. C.
- ItemPoly(tetrahalo-p-phenylenechalcogenide)s : synthesis and properties(1992) Díaz Alzamora, Fernando Raúl; Tagle Domínguez, Luis Hernán; Gárate, M.; Godoy, A.
- ItemPolymerization by phase transfer catalysis .21. Synthesis of poly(amido-carbonate)s and poly(amido-thiocarbonate)s(1996) Tagle Domínguez, Luis Hernán; Díaz Alzamora, Fernando Raúl; Godoy, A.
- ItemStudy of the effect of acid doping on the properties of poly(N-seleno-p-phenylene diamine)(1997) Bernede, J. C.; Godoy, A.; Molinie, P.; Díaz Alzamora, Fernando Raúl; Roquand, N.; Tregouet, Y.; Valle Delaware la Cortina, María Angélica del
- ItemSyntheses, characterization and electrical properties of several poly(seleno-p-arylenediamines)(1995) Díaz Alzamora, Fernando Raúl; Tagle Domínguez, Luis Hernán; Godoy, A.; Contreras, S.
- ItemSynthesis and characterization of poly(pyridylurea) and poly(pyridylthiourea), potentially semiconducting polymers(2007) Díaz Alzamora, Fernando Raúl; Godoy, A.; Moreno, J.; Bernède, Jean Christian; Valle Delaware la Cortina, María Angélica del; Tagle Domínguez, Luis Hernán; East, G. A.
- ItemSynthesis and characterization of polymers derived from 2,5‐dimethoxy‐terephthaldehyde and 2,5‐dimethoxy‐terephthalic acid(1985) Díaz Alzamora, Fernando Raúl; Tagle Domínguez, Luis Hernán; Godoy, A.; Hodgson, C.; Olivares, J. P.
- ItemSynthesis and optical behavior of PLED devices based on (PMMA)/(PAA)/Er(AP)(6)Cl-3 complex and N,N '-didodecyl-3,4,9,10-perylene tetracarboxylic diimide composites(2013) Díaz Espinoza, M. S.; Poblete, V. H.; Bernede, J.; Cattin, L.; Godoy, A.; Díaz Alzamora, Fernando Raúl; Gaumer, N.
- ItemSynthesis, characterization, electropolymerization, and theoretical study of 2,3-di-(2-thienyl)quinoxaline(2006) Díaz Alzamora, Fernando Raúl; Valle de la Cortina, María Angélica del; Núñez, C.; Godoy, A.; Mondaca, J. L.; Toro Labbé, Alejandro; Bernède, Jean Christian
- ItemThe open circuit voltage of encapsulated plastic photovoltaic cells(2008) Berredjem, Y.; Karst, N.; Cattin, L.; Lakhdar Toumi, A.; Godoy, A.; Soto González, Giovanny Mauricio; Díaz Alzamora, Fernando Raúl; Valle de la Cortina, María Angélica del; Morsli, M.; Drici, Abdelaziz; Boulmokh, A.; Gheid, A. H.; Khelil, A.; Bernède, J. C.
- ItemZnO thin films fabricated by chemical bath deposition, used as buffer layer in organic solar cells(ELSEVIER SCIENCE BV, 2009) Lare, Y.; Godoy, A.; Cattin, L.; Jondo, K.; Abachi, T.; Diaz, F. R.; Morsli, M.; Napo, K.; del Valle, M. A.; Bernede, J. C.ZnO thin films synthetized by chemical bath deposition are used as buffer layer between the anode and the organic electron donor in organic solar cells. Films deposited from zinc nitrate solutions are annealed in room air at 300 degrees C for half an hour. The X-ray diffraction and microanalysis studies show that ZnO polycrystalline thin films are obtained. The solar cells used are based on the couple copper phthalocyanine as electron donor and (N, N-diheptyl-3,4,9,10-perylenetetracarboxylicdiimide-PTCDI-C7) as electron acceptor. It is shown that the presence of the ZnO buffer layer improves the energy conversion efficiency of the cells. Such improvement could be attributed to a better energy level alignment at the anode/electron donor interface. The anode roughness induced by the ZnO buffer layer can also transform the planar interface organic electron donor/electron acceptor into roughen topography. This increases the interface area, where carrier separation takes place, which improves solar cells performances. (C) 2009 Elsevier B. V. All rights reserved.