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Abad E, Dappe YJ, Martínez JI, Flores F, Ortega J. C6H6/Au(111): interface dipoles, band alignment, charging energy, and van der Waals interaction. J Chem Phys 2011; 134:044701. [PMID: 21280779 DOI: 10.1063/1.3521271] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We analyze the benzene/Au(111) interface taking into account charging energy effects to properly describe the electronic structure of the interface and van der Waals interactions to obtain the adsorption energy and geometry. We also analyze the interface dipoles and discuss the barrier formation as a function of the metal work-function. We interpret our DFT calculations within the induced density of interface states (IDIS) model. Our results compare well with experimental and other theoretical results, showing that the dipole formation of these interfaces is due to the charge transfer between the metal and benzene, as described in the IDIS model.
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Frazier SA, Johns SM, Ortega J, Zwingenberger AL, Kent MS, Hammond GM, Rodriguez CO, Steffey MA, Skorupski KA. Outcome in dogs with surgically resected oral fibrosarcoma (1997-2008)*. Vet Comp Oncol 2011; 10:33-43. [DOI: 10.1111/j.1476-5829.2011.00272.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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103
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Lyons SW, Ortega J, Wang LM, Kodas TT. Multicomponent Ceramic Powder Generation by Spray Pyrolysis. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-271-907] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTWe have examined methods for controlling the morphology and microstructure of ceramic particles produced by spray pyrolysis. A variety of materials were examined including SrTiO3and BaTiO3 and the oxides of Al, Mg, Zn, Pd, V, Mo, and Bi. The morphology of the particles was influenced by using colloidal precursors in combination with molecular precursors for particle generation. Slow drying rates obtained by using high relative humidities and controlled axial temperature gradients did not influence particle morphology for the systems and conditions studied. The microstructure of Al2O3, V2O5, and PdO particles was controlled by varying the temperature to provide nanocrystalline or single-crystal particles. Evaporation and condensation of volatile species such as MoO3 and V2O5 dramatically modified particle microstructure and morphology.
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Margarit C, Asensio M, Dávila K, Ortega J, Iglesias J, Tormo R, Charco R. Analysis of risk factors following pediatric liver transplantation. Transpl Int 2011. [DOI: 10.1111/j.1432-2277.2000.tb02008.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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105
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Navas A, Ortega J, Palomar J, Díaz C, Vreekamp R. COSMO-RS analysis on mixing properties obtained for the systems 1-butyl-X-methylpyridinium tetrafluoroborate [X = 2,3,4] and 1,ω-dibromoalkanes [ω = 1–6]. Phys Chem Chem Phys 2011; 13:7751-9. [DOI: 10.1039/c0cp02169e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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106
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Navas A, Ortega J, Martín T, Palomar J. Thermodynamic Analysis of Systems Formed by Alkyl Esters with α,ω-Alkyl Dibromides: New Experimental Information and the Use of a Dense Database to Describe Their Behavior Using the UNIFAC Group Contribution Method and the COSMO-RS Methodology. Ind Eng Chem Res 2010. [DOI: 10.1021/ie101479v] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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107
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Espiau F, Ortega J, Penco E, Wisniak J. Advances in the Correlation of Thermodynamic Properties of Binary Systems Applied to Methanol Mixtures with Butyl Esters. Ind Eng Chem Res 2010. [DOI: 10.1021/ie101165r] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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108
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Martinez-Perdiguero J, Etxebarria J, Folcia CL, Ortega J, Gimeno N, Ros MB. Pseudolayered structure of the columnar B1 phase of bent-core liquid crystals. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2010; 82:041706. [PMID: 21230294 DOI: 10.1103/physreve.82.041706] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2010] [Revised: 06/30/2010] [Indexed: 05/30/2023]
Abstract
Three bent-core liquid-crystal compounds presenting the unusual columnar B1 to tilted polar smectic (Sm-CP or B2) phase transition are studied through small-angle x-ray diffraction on aligned samples. The well-established character of the smectic phase helps to characterize the structural changes during the transition. A mechanism for this transition is proposed, which accounts for the low enthalpy usually observed in this process. The B1 phase is found to possess a great degree of lamellarization, with pseudosmectic ferroelectric layers along the crystallographic (11) planes. As a consequence of these observations a distribution of the block polarizations in the columnar structure is proposed.
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Beneitez P, Ortiz S, Ortega J. INFLUENCE OF THE ACETATE MEDIUM ON THE EXTRACTIONOF Co(II) BYDI-2ETHYLHEXYL PHOSPHORIC ACID. SOLVENT EXTRACTION AND ION EXCHANGE 2010. [DOI: 10.1080/07366298508918533] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Baena MJ, Espinet P, Folcia CL, Ortega J, Etxebarría J. Photoisomerizable Metallomesogens and Soft Crystals Based on Orthopalladated Complexes. Inorg Chem 2010; 49:8904-13. [DOI: 10.1021/ic1010665] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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111
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Bueno J, Perez-Lafuente M, Venturi C, Segarra A, Barber I, Molino JA, Romero A, Ortega J, Bilbao I, Martinez-Ibañez V, Charco R. No-touch hepatic hilum technique to treat early portal vein thrombosis after pediatric liver transplantation. Am J Transplant 2010; 10:2148-53. [PMID: 20887425 DOI: 10.1111/j.1600-6143.2010.03236.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A 'no-touch' hilum technique used to treat early portal vein complications post-liver transplantation in five children with body weight <10 kg is described. Four patients developed thrombosis and one portal flow absence secondary to collateral steal flow. A vascular sheath was placed through the previous laparotomy in the ileocolic vein (n = 2), inferior mesenteric vein (n = 1) or graft umbilical vein (n = 1). Portal clots were mechanically fragmented with balloon angioplasty. In addition, coil embolization of competitive collaterals (n = 3) and stent placement (n = 1) were performed. The catheter was left in place and exteriorized through the wound (n = 2) or a different transabdominal wall puncture (n = 3). A continuous transcatheter perfusion of heparin was subsequently administered. One patient developed recurrent thrombosis 24 h later which was resolved with the same technique. Catheters were removed surgically after a mean of 10.6 days. All patients presented portal vein patency at the end of follow-up. Three patients are alive after 5 months, 1.5 and 3.5 years, respectively; one patient required retransplantation 18 days postprocedure and the remaining patient died of adenovirus infection 2 months postprocedure. In conclusion, treatment of early portal vein complications following pediatric liver transplantation with this novel technique is feasible and effective.
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Abad E, Martínez JI, Ortega J, Flores F. Barrier formation and charging energy for a variable nanogap organic molecular junction: a tip/C60/Au(111) configuration. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:304007. [PMID: 21399339 DOI: 10.1088/0953-8984/22/30/304007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We analyze the nanogap organic molecular junction formed by a C(60) molecule in between an Au-tip and an Au(111)-surface. In our approach, we first calculate the atomic geometry of the tip/C(60)/Au(111) nanocontact as a function of the tip-surface distance and molecule adsorption site using a density functional theory-local density approximation (DFT-LDA) technique. The electronic structure and metal/organic barrier height formation (for a single molecule) are analyzed using the induced density of interface states model for metal/organic interfaces. From this analysis we calculate the charging energy U(eff) of the C(60) molecule at the nanocontact and determine self-consistently the transport energy gap and the organic molecule density of states. Our results are shown to be in good agreement with the experimental evidence.
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Ortega J. Excess Enthalpies of Alkyl Formates + (n-Alkanes or 1-Chloroalkanes). Experimental Data and their Analysis in Terms of the UNIFAC Model. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19890930614] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Civera M, Urios A, Garcia-Torres ML, Ortega J, Martinez-Valls J, Cassinello N, del Olmo JA, Ferrandez A, Rodrigo JM, Montoliu C. Relationship between insulin resistance, inflammation and liver cell apoptosis in patients with severe obesity. Diabetes Metab Res Rev 2010; 26:187-92. [PMID: 20222158 DOI: 10.1002/dmrr.1070] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND In obesity, insulin resistance appears frequently after activation of proinflammatory molecules. Caspase-generated cytokeratin-18 (CK-18) fragments are produced during the apoptosis of hepatic cells. The main objective in the present study is to investigate the relationship between insulin resistance and caspase-generated CK-18 fragments in patients with severe obesity. METHODS Sixty-two patients selected for bariatric surgery were clinically studied (sex, age, weight, waist diameter, body mass index, arterial pressure and type 2 diabetes mellitus) and analytic parameters were measured in blood (glucose concentration, cholesterol, triglycerides, insulin, glycosylated hemoglobin, aspartate aminotransferase, alanine aminotransferase, high-sensitivity C-reactive protein, adiponectin, interleukin 6, interleukin 18 and CK-18 fragments). Patient group division was based on 70th percentile of insulin resistance as measured by homeostasis model assessment (HOMA) and also according to liver histology. RESULTS Patients with greater insulin resistance (percentile > 70th) showed higher values of CK-18 fragments, interleukin 6 and transaminases. A positive correlation between the HOMA score, value of CK-18 fragments and triglyceride level was found. A correlation between CK-18 fragments with interleukin 6, triglycerides and transaminases was also observed. HOMA score and value of CK-18 fragments correlated with the degree of liver fibrosis. CONCLUSIONS Greater degree of insulin resistance induces apoptosis of hepatic cells as measured by the serum levels of CK-18 fragments.
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Ortega J, Uzal FA, Walker R, Kinde H, Diab SS, Shahriar F, Pamma R, Eigenheer A, Read DH. Zygomycotic Lymphadenitis in Slaughtered Feedlot Cattle. Vet Pathol 2010; 47:108-15. [DOI: 10.1177/0300985809352975] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
During the 12 months of 2006, zygomycotic lymphadenitis was diagnosed in 194 of 198 feedlot steers (0.04% of cattle slaughtered during that period) in a California slaughterhouse as part of bovine tuberculosis surveillance. Mesenteric lymph nodes were involved in 190 cases. Affected lymph nodes were enlarged (2 to 42 cm in greatest dimension), firm, and mottled gray-white to yellow with multiple granular or caseocalcareous foci. Histologically, nodal architecture was effaced by necrosis, granulomatous inflammation, and fibrosis. In approximately 20% of the cases, granulomas were mainly restricted to subcapsular sinuses and afferent lymphatic vessels, causing granulomatous lymphangitis. Nonseptate, irregularly branching hyphae with nonparallel walls and bulbous enlargements were common in necrotic areas and within the cytoplasm of multinucleated giant cells. Fungal cultures were performed on 124 affected lymph nodes using 7 media, but no zygomycetes were cultured. Fungal DNA was amplified from 20 lymph nodes. Amplicons from 16 nodes had nearly 100% homology with sequences for Rhizomucor pusillus; 4 amplicons had (> 98%) homology with Absidia corymbifera sequences. Zygomycosis should be considered in the differential diagnosis for granulomatous lymphadenitis in feedlot steers.
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Ortega J, Espiau F, Wisniak J. New Parametric Model to Correlate the Gibbs Excess Function and Other Thermodynamic Properties of Multicomponent Systems. Application to Binary Systems. Ind Eng Chem Res 2009. [DOI: 10.1021/ie900898t] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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117
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Perez JL, Carrero I, Gonzalo P, Arevalo-Serrano J, Sanz-Anquela JM, Ortega J, Rodriguez M, Gonzalo-Ruiz A. Soluble oligomeric forms of beta-amyloid (Abeta) peptide stimulate Abeta production via astrogliosis in the rat brain. Exp Neurol 2009; 223:410-21. [PMID: 19879263 DOI: 10.1016/j.expneurol.2009.10.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2009] [Revised: 09/29/2009] [Accepted: 10/17/2009] [Indexed: 10/20/2022]
Abstract
The aim of this study was to investigate the interaction between beta-amyloid (Abeta) peptide and astrogliosis in early stages of Abeta toxicity. In Wistar rats, anaesthetised with equitesine, a single microinjection of Abeta1-42 oligomers was placed into the retrosplenial cortex. Control animals were injected with Abeta42-1 peptide into the corresponding regions of cerebral cortex. Immunocytochemical analysis revealed an intense Abeta immunoreactivity (IR) at the level of Abeta1-42 injection site, increasing from the first 24 h to later (72 h) time point. Control injection showed a light staining surrounding the injection site. In Abeta oligomers-treated animals, Abeta-immunopositive product also accumulates in cortical cells, particularly in frontal and temporal cortices at an early (24 h) time point. Abeta-IR structures-like diffuse aggregates forms were also observed in hippocampus and in several cortical areas, increasing from the first 24 h to later (72 h) time point. In control animals no specific staining was seen neither in cortical cells nor in structures-like diffuse aggregates forms. Injections of Abeta oligomers also induce activation of astrocytes surrounding and infiltrating the injection site. Astrocyte activation is evidenced by morphological changes and upregulation of glial fibrillary acidic protein (GFAP). By GFAP immunoblotting we detected two immunopositive protein bands, at 50 and 48 kDa molecular mass. Confocal analysis also showed that GFAP co-localized with Abeta-IR material in a time-dependent manner. In conclusion, our results indicate that astrocyte activation might have a critical role in the mechanisms of Abeta-induced neurodegeneration, and that should be further studied as possible targets for therapeutic intervention in AD.
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Flores F, Ortega J, Vázquez H. Modelling energy level alignment at organic interfaces and density functional theory. Phys Chem Chem Phys 2009; 11:8658-75. [PMID: 20449007 DOI: 10.1039/b902492c] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A review of our theoretical understanding of the band alignment at organic interfaces is presented with particular emphasis on the metal/organic (MO) case. The unified IDIS (induced density of interface states) and the ICT (integer charge transfer) models are reviewed and shown to describe qualitatively and semiquantitatively the barrier height formation at those interfaces. The IDIS model, governed by the organic CNL (charge neutrality level) and the interface screening includes: (a) charge transfer across the interface; (b) the "pillow" (or Pauli) effect associated with the compression of the metal wavefunction tails; and (c) the molecular dipoles. We argue that the ICT-model can be described as a limiting case of the unified IDIS-model for weak interface screening. For a fully quantitative understanding of the band alignment at organic interfaces, use of DFT (density functional theory) or quantum chemistry methods is highly desirable. In this Perspective review, we concentrate our discussion on DFT and show that conventional LDA or GGA calculations are limited by the "energy gap problem of the organic materials", because the LDA (or GGA) Kohn-Sham energy levels have to be corrected by the self-interaction energy of the corresponding wavefunction, to provide the appropriate molecule transport energy gap. Image potential and polarization effects at MO interfaces tend to cancel these self-interaction corrections; in particular, we show that for organic molecules lying flat on Cu and Ag, these cancellations are so strong that we can rely on conventional DFT to calculate their interface properties. For Au, however, the cancellations are weaker making it necessary to go beyond conventional DFT. We discuss several alternatives beyond conventional LDA or GGA. The most accurate approach is the well-known GW-technique, but its use is limited by its high demanding computer time. In a very simple approach one can combine conventional DFT with a "scissor" operator which incorporates self-interaction corrections and polarization effects in the organic energy levels. Hybrid potentials combined with conventional DFT represent, probably, the best alternative for having a simple and accurate approach for analyzing organic interfaces. The problem then is to find an appropriate one for both the metal and the organic material in a plane-wave formulation; we show, however, how to overcome this difficulty using a local-orbital basis formulation. As examples of these alternatives, we present some DFT-calculations for several organic interfaces, using either the scissor operator or a hybrid potential, which can be interpreted in terms of the unified IDIS-model.
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Ortega J, Uzal F, Walker R, Kinde H, Diab S, Shahriar F, Eigenheer A, Pamma R, Read D. ZYGOMYCOTIC LYMPHADENITIS IN SLAUGHTERED FEEDLOT CATTLE. Vet Pathol 2009. [DOI: 10.1354/vp.08-vp-0284-o-fl] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Roth S, Rigo P, Ortega J, Chaillou-Opitz S, Pesce A. Fibrose rétropéritonéale, mycophénolate mofétil et PET-scan : nouvelles indications. Rev Med Interne 2009. [DOI: 10.1016/j.revmed.2009.03.262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Wigger-Albert W, Kuhlmann M, Wilhelm D, Mrowietz U, Eichhorn K, Ortega J, Bredehorst A, Wilhelm KP. Efficacy of a polyurethane dressing versus a soft silicone sheet on hypertrophic scars. J Wound Care 2009; 18:208, 210-4. [DOI: 10.12968/jowc.2009.18.5.42175] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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122
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González Ramos P, Royo Manero P, Pastor Oliver C, Calleja Aguayo E, De Martino A, Godino J, Bejarano Lasunción P, Manero FJ, Pecondón A, Vicente B, Gracia Romero J, Ortega J, García Manero M, Alcázar Zambrano JL, González de Agüero R, Fabre González E, López García G. [Proposal for a new microsurgical model for the study of induced endometriosis in Wistar rats. Preliminary results]. REVISTA DE MEDICINA DE LA UNIVERSIDAD DE NAVARRA 2009; 53:14-19. [PMID: 19994764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The current knowledge status on the patogenesis of endometriosis as well as devastating consequences of disease evolution in women's reproductive health, have promoted researchers advances in a great manner during last years. The immunologic and neangiogenesis systems implication have opened new ways of knowledge over classic theories from the beginning of the xx century. The experimental resesearch, using animal induction models. Below we explain the first steps a new induction model ("PGR1-HotDog"), based on Wistar rats using a new disease autogeneration system, created for te study of the early stages of the endometriosis.
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González C, Guo J, Ortega J, Flores F, Weitering HH. Mechanism of the band gap opening across the order-disorder transition of Si(111)(4 x 1)-In. PHYSICAL REVIEW LETTERS 2009; 102:115501. [PMID: 19392212 DOI: 10.1103/physrevlett.102.115501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2008] [Indexed: 05/27/2023]
Abstract
The ground state properties of indium atom chains on the Si(111) 8 x 2-In surface and the nature of their insulator-metal (IM) transition near 120 K are under intense dispute. We compare experimental scanning tunneling microscopy (STM) images of the low temperature (LT) 8 x 2 phase with STM image calculations from Density Functional Theory (DFT). Our LT studies clearly indicate the existence of a frozen shear distortion between neighboring atom chains, resulting in the formation of indium hexagons. Tunneling spectra furthermore indicate that the IM transition coincides with the collapse of a approximately 0.3 eV surface-state band gap at the Gamma point of the 4 x 2 Brillouin zone. This implies that the IM transition is driven by a shear phonon, not by Fermi surface nesting.
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González C, Ortega J, Flores F, Martínez-Martín D, Gómez-Herrero J. Initial stages of the contact between a metallic tip and carbon nanotubes. PHYSICAL REVIEW LETTERS 2009; 102:106801. [PMID: 19392140 DOI: 10.1103/physrevlett.102.106801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2008] [Indexed: 05/27/2023]
Abstract
We present an experimental and theoretical study of the interaction between a tip and single-walled carbon nanotubes (SWCNT) lying on a SiO2 surface. Adhesion and jump-to-contact forces (JC) are measured in a high vacuum system for SWCNT with diameters (D) ranging from 1.4 to 4.5 nm; we find adhesion forces approximately 3.2 nN and JC forces approximately 2.4 nN. Simulations yield adhesion forces in agreement with experiment showing that for D approximately 1.4 nm half of this force is due to tip-SWCNT and tip-SiO2 van der Waals interactions.
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Navas A, Ortega J, Vreekamp R, Marrero E, Palomar J. Experimental Thermodynamic Properties of 1-Butyl-2-methylpyridinium Tetrafluoroborate [b2mpy][BF4] with Water and with Alkan-1-ol and Their Interpretation with the COSMO-RS Methodology. Ind Eng Chem Res 2009. [DOI: 10.1021/ie8009878] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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126
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Urquiza JM, Rojas I, Pomares H, Florido JP, Rubio G, Herrera LJ, Calvo JC, Ortega J. Method for Prediction of Protein-Protein Interactions in Yeast Using Genomics/Proteomics Information and Feature Selection. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/978-3-642-02478-8_107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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127
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Papadopoulos CM, Tsai SY, Guillen V, Ortega J, Kartje GL, Wolf WA. Motor recovery and axonal plasticity with short-term amphetamine after stroke. Stroke 2009; 40:294-302. [PMID: 19038917 PMCID: PMC3806086 DOI: 10.1161/strokeaha.108.519769] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2008] [Accepted: 05/08/2008] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE There is considerable debate regarding the efficacy of amphetamine to facilitate motor recovery after stroke or experimental brain injury. Different drug dosing and timing schedules and differing physical rehabilitation strategies may contribute to outcome variability. The present study was designed to ascertain (1) whether short-term amphetamine could induce long-term functional motor recovery in rats after an ischemic lesion modeling stroke in humans; (2) how different levels of physical rehabilitation interact with amphetamine to enhance forelimb-related functional outcome; and (3) whether motor improvement was associated with axonal sprouting from intact corticoefferent pathways originating in the contralesional forelimb motor cortex. METHODS After permanent middle cerebral artery occlusion, rats received vehicle or amphetamine during the first postoperative week (2 mg/kg, subcutaneously on Postoperative Days 2, 5, and 8). In both treatment groups, separate cohorts of rats were exposed to different levels of "physical rehabilitation" represented by a control environment, enriched environment, or enriched environment with additional sessions of focused activity. Skilled forelimb performance was assessed using the forelimb reaching task and ladder rung walk test. Anterograde tracing with biotinylated dextran amine was used to assess new fiber outgrowth to denervated motor areas. RESULTS All treatment groups showed significant motor improvement as compared with control-housed, vehicle-treated animals. However, animals housed in an enriched environment that received amphetamine paired with focused activity sessions performed significantly better than any other treatment group and was the only group to achieve complete motor recovery (ie, reached preoperative performance) by 8 weeks. This recovery was associated with axonal sprouting into deafferentated subcortical areas from contralesional projection neurons. CONCLUSIONS This study suggests that, after stroke, short-term pairing of amphetamine with sufficiently focused activity is an effective means of inducing long-term improvement in forelimb motor function. The anatomic data suggests that corticoefferent plasticity in the form of axonal sprouting contributes to the maintenance of motor recovery.
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Roncero O, de Lara-Castells MP, Villarreal P, Flores F, Ortega J, Paniagua M, Aguado A. An inversion technique for the calculation of embedding potentials. J Chem Phys 2008; 129:184104. [DOI: 10.1063/1.3007987] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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129
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Alonso I, Martínez-Perdiguero J, Folcia CL, Etxebarria J, Ortega J, Pintre IC, Ros MB. Polar structures of bent-core liquid crystals with tetrathiafulvalene units. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2008; 78:041701. [PMID: 18999439 DOI: 10.1103/physreve.78.041701] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2008] [Indexed: 05/27/2023]
Abstract
We report on a series of three bent-core liquid crystals containing tetrathiafulvalene units. Their characterization consisted of electro-optical observations, second-harmonic generation (SHG) analysis, and x-ray diffraction measurements. Compound I exhibits a lamellar optically isotropic phase on cooling from the isotropic liquid and undergoes a nonreversible field-induced transition to a birefringent state. The two others present two-dimensional structural periodicities, being only compound II switchable. Additionally, the electron density maps of compounds II and III have been obtained based on the analysis of the x-ray diffraction intensities. According to SHG measurements the ground state is antiferroelectric in the three compounds. A quite good SHG performance is found in compounds I and II.
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Ortega J, Hartman J, Rodriguez J, Maitland D. Post-treatment hemodynamics of a basilar aneurysm and bifurcation. Ann Biomed Eng 2008; 36:1531-46. [PMID: 18629647 PMCID: PMC2704058 DOI: 10.1007/s10439-008-9535-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2008] [Accepted: 06/30/2008] [Indexed: 11/29/2022]
Abstract
To investigate whether or not a successful aneurysm treatment procedure can subject a parent artery to harmful hemodynamic stresses, computational fluid dynamics simulations are performed on a patient-specific basilar aneurysm and bifurcation before and after a virtual endovascular treatment. Prior to treatment, the aneurysm at systole is filled with a periodic train of vortex tubes, which form at the aneurysm neck and advect upwards into the dome. Following the treatment procedure however, the motion of the vortex train is inhibited by the aneurysm filling material, which confines the vortex tubes to the region beneath the aneurysm neck. Analysis of the post-treatment flow field indicates that the impingement of the basilar artery flow upon the treated aneurysm neck and the close proximity of a vortex tube to the parent artery wall increase the maximum wall shear stresses to values approximately equal to 50 Pa at systole. Calculation of the time-averaged wall shear stresses indicates that there is a 1.4 x 10(-7) m(2) area on the parent artery exposed to wall shear stresses greater than 37.9 Pa, a value shown by Fry [Circ. Res. 22(2):165-197, 1968] to cause severe damage to the endothelial cells that line the artery wall. The results of this study demonstrate that it is possible for a treatment procedure, which successfully isolates the aneurysm from the circulation and leaves no aneurysm neck remnant, to elevate the hemodynamic stresses to levels that are injurious to the artery wall.
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131
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Pieczyrak B, González C, Jelínek P, Pérez R, Ortega J, Flores F. Mechanical and electrical properties of stretched clean and H-contaminated Pd-nanowires. NANOTECHNOLOGY 2008; 19:335711. [PMID: 21730637 DOI: 10.1088/0957-4484/19/33/335711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We analyze theoretically the formation of stretched Pd-nanowires and their interaction with hydrogen. In our approach, we simulate the nanowire stretching process using a first-principles molecular-dynamics method to obtain realistic atomic geometries of the contact in its final stages before the nanowire breaks. The electrical conductance of the nanowire is also calculated at each point of the deformation path. For the clean Pd-nanowire in the last stages of the deformation process we find that the nanowire develops, first, a one-atom-neck and, at the end, a dimer whose bond is finally broken. For these atomic configurations, the calculated electrical conductances are in good agreement with the experimental evidence. The interaction with hydrogen is analyzed adsorbing one or two H atoms on the Pd-nanowire for different configurations along the stretching process. In the case of one H atom we obtain geometries with conductances in the range 0.8-1.4G(0), while for two H atoms we find conductance plateaus with values ∼0.5G(0) and ∼1.0G(0). These results are in excellent agreement with the experimental evidence for nanocontact breaking in an H(2) atmosphere and indicate that the conductance peak around 0.5G(0) observed experimentally is associated with nanowires where two H atoms have been adsorbed.
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132
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Etxebarria J, Folcia CL, Ortega J. Comment on "Optical activity produced by layer chirality in bent-core liquid crystals". PHYSICAL REVIEW LETTERS 2008; 101:079801-079802. [PMID: 18764590 DOI: 10.1103/physrevlett.101.079801] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2007] [Indexed: 05/26/2023]
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133
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Ortega J, Marrero E, Palomar J. Description of Thermodynamic Behavior of the Systems Formed by Alkyl Ethanoates with 1-Chloroalkanes Using the COSMO-RS Methodology Contributing with New Experimental Information. Ind Eng Chem Res 2008. [DOI: 10.1021/ie071467m] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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134
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Martínez-Perdiguero J, Alonso I, Ortega J, Folcia CL, Etxebarria J, Pintre I, Ros MB, Amabilino DB. Bent-core liquid-crystalline derivative of tetrathiafulvalene: photoresponsivity and deracemization. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2008; 77:020701. [PMID: 18351975 DOI: 10.1103/physreve.77.020701] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2007] [Indexed: 05/26/2023]
Abstract
A bent-core mesogen containing a tetrathiafulvalene group is studied. The mesophase is an optically isotropic spongelike smectic phase without optical activity. The material responds to uv light in a peculiar way, showing photoconductivity and, in some circumstances, changing its mesomorphic properties. Under an electric field, large chiral domains are segregated from an initial racemic phase within a few minutes.
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135
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Betti MG, Kanjilal A, Mariani C, Vázquez H, Dappe YJ, Ortega J, Flores F. Barrier formation at organic interfaces in a Cu(100)-benzenethiolate-pentacene heterostructure. PHYSICAL REVIEW LETTERS 2008; 100:027601. [PMID: 18232924 DOI: 10.1103/physrevlett.100.027601] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2007] [Indexed: 05/24/2023]
Abstract
The energy level alignment at the metal-organic and organic-organic interfaces of the Cu(100)/benzenethiolate/pentacene heterostructure is studied by photoemission spectroscopy and discussed theoretically using a model that includes, in a consistent way, charge transfer, Pauli repulsion, intrinsic molecular dipoles, and interface screening as a function of coverage. Despite the different nature of the two interfaces, our model provides a unified explanation for the work-function changes at both junctions and enables us to determine the benzenethiolate orientation as a function of coverage.
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Pujol M, Peña Y, Vazquez A, Balcells J, Ortega J, Roqueta J. Immunocompromised pediatric patients with acute respiratory failure: outcome and prognosis factors. Crit Care 2008. [PMCID: PMC4088866 DOI: 10.1186/cc6716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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137
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Pedro T, Martínez-Hervás S, Lorente R, Catalá M, Ortega J, Real JT, Carmena R. [Difficult treatment of amiodarone-induced thyrotoxicosis: a case report]. ANALES DE MEDICINA INTERNA (MADRID, SPAIN : 1984) 2007; 24:543-546. [PMID: 18275264 DOI: 10.4321/s0212-71992007001100007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Amiodarone causes changes in thyroid function tests in about 15-20% of patients, inducing either hypothyroidism or thyrotoxicosis. The iodine load and the destructive thyroiditis caused by amiodarone produce thyrotoxicosis. We report a case of amiodarone-induced thyrotoxicosis diagnosed when investigating the reason for worsening of cardiac function. Prognosis and treatment of cardiac disorder were determined by thyrotoxicosis. The management needed a closed monitoring of thyroid function. Treatment was based on high doses of propylthiouracil and dexamethasone, but they couldn t control cardiac condition and surgery was warranted. When amiodarone-induced thyrotoxicosis is refractory to medical treatment, we believe surgery should be considered earlier.
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Ozsahin H, Cavazzana-Calvo M, Notarangelo LD, Schulz A, Thrasher AJ, Mazzolari E, Slatter MA, Le Deist F, Blanche S, Veys P, Fasth A, Bredius R, Sedlacek P, Wulffraat N, Ortega J, Heilmann C, O'Meara A, Wachowiak J, Kalwak K, Matthes-Martin S, Gungor T, Ikinciogullari A, Landais P, Cant AJ, Friedrich W, Fischer A. Long-term outcome following hematopoietic stem-cell transplantation in Wiskott-Aldrich syndrome: collaborative study of the European Society for Immunodeficiencies and European Group for Blood and Marrow Transplantation. Blood 2007; 111:439-45. [PMID: 17901250 DOI: 10.1182/blood-2007-03-076679] [Citation(s) in RCA: 193] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Wiskott-Aldrich syndrome (WAS) is a rare X-linked immunodeficiency with microthrombocytopenia, eczema, recurrent infections, autoimmune disorders, and malignancies that are life-threatening in the majority of patients. In this long-term, retrospective, multicenter study, we analyzed events that occurred in 96 WAS patients who received transplants between 1979 and 2001 who survived at least 2 years following hematopoietic stem-cell transplantation (HSCT). Events included chronic graft-versus-host disease (cGVHD), autoimmunity, infections, and sequelae of before or after HSCT complications. Three patients (3%) died 2.1 to 21 years following HSCT. Overall 7-year event-free survival rate was 75%. It was lower in recipients of mismatched related donors, also in relation with an older age at HSCT and disease severity. The most striking finding was the observation of cGVHD-independent autoimmunity in 20% of patients strongly associated with a mixed/split chimerism status (P < .001), suggesting that residual-host lymphocytes can mediate autoimmune disease despite the coexistence of donor lymphocytes. Infectious complications (6%) related to splenectomy were also significant and may warrant a more restrictive approach to performing splenectomy in WAS patients. Overall, this study provides the basis for a prospective, standardized, and more in-depth detailed analysis of chimerism and events in long-term follow-up of WAS patients who receive transplants to design better-adapted therapeutic strategies.
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Ortega J, Espiau F, Vreekamp R, Tojo J. Modeling and Experimental Evaluation of Thermodynamic Properties for Binary Mixtures of Dialkylcarbonate and Alkanes Using a Parametric Model. Ind Eng Chem Res 2007. [DOI: 10.1021/ie0707366] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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140
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Snijders PC, Moon EJ, González C, Rogge S, Ortega J, Flores F, Weitering HH. Controlled self-organization of atom vacancies in monatomic gallium layers. PHYSICAL REVIEW LETTERS 2007; 99:116102. [PMID: 17930452 DOI: 10.1103/physrevlett.99.116102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2007] [Indexed: 05/25/2023]
Abstract
Ga adsorption on the Si(112) surface results in the formation of pseudomorphic Ga atom chains. Compressive strain in these atom chains is relieved via creation of adatom vacancies and their self-organization into meandering vacancy lines. The average spacing between these line defects can be controlled, within limits, by adjusting the chemical potential mu of the Ga adatoms. We derive a lattice model that quantitatively connects density functional theory (DFT) calculations for perfectly ordered structures with the fluctuating disorder seen in experiment and the experimental control parameter mu. This hybrid approach of lattice modeling and DFT can be applied to other examples of line defects in heteroepitaxy.
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141
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Etxebarria J, Ortega J, Folcia CL. Relationship between structure and optical properties of lithium triborate. J Appl Crystallogr 2007. [DOI: 10.1107/s0021889807033663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Measurements of the optical rotation of LiB3O5have been carried out using a high-accuracy universal polarimeter in the temperature range 298–503 K. The results have been analyzed within the framework of a point-dipole model for the optical rotation. Though the magnitude of the rotation is very small, its sign has been clearly determined and linked to the crystallographic structure. A slight modification of the point-dipole model also permits an explanation of the values of the second-order susceptibility coefficients for second-harmonic generation.
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Bueno J, Medina A, Ortega J, Escartin A, Bello M, Bilbao I, Balsells J, Margarit C. Liver Transplantation in Childhood With More Than 10 Years of Follow-up: Analysis of a Single-Center Experience. Transplant Proc 2007; 39:2288-9. [PMID: 17889165 DOI: 10.1016/j.transproceed.2007.06.052] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
UNLABELLED We pioneered pediatric liver transplantation (OLT) in Spain (June 1985). The aim of this study was to evaluate the current status of our OLT recipients with more than 10 years follow-up. MATERIALS AND METHODS The 50 patients with >10 years follow-up had a mean age at OLT of 5.6 years with 60% showing a main indication of biliary atresia. All but one (tacrolimus) received cyclosporine. RESULTS No patient loss occurred among these patients. Eighteen patients had follow-up >15 years and 12 >20 years. The incidence of acute rejection was 56%; chronic rejection, 16%; and lymphoproliferative disorders, 12%. Seven (14%) required retransplantation at a mean of 4.2 years after the first OLT due in four instances to chronic rejection. After 10 years of follow-up, one patient developed portal vein thrombosis and three biliary strictures. All patients remain on immunosuppression. In 64% cyclosporine was switched to tacrolimus or another agent. One patient developed acute rejection at 19.2 years. In 14% of patients the liver function test is abnormal with serum creatinine is >1.5 mg/dL in 10%; one requires insulin and three, antihypertensive drugs. Noncompliance with medications was detected in 10%. Three recipients had offspring. CONCLUSIONS OLT was an effective treatment with a good quality of life also on long-term follow-up.
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Ortega J, Flores S, Roqueta J, Pujol M, Cañadas S, Domínguez P, Balcells J. O.83. ¿Es útil el BIS en el manejo de la sedación del paciente crítico pediátrico? An Pediatr (Barc) 2007. [DOI: 10.1016/s1695-4033(07)70559-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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144
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Folcia CL, Ortega J, Etxebarria J. Quantitative analysis of the x-ray diffraction intensities of undulated smectic phases in bent-core liquid crystals. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2007; 76:011713. [PMID: 17677477 DOI: 10.1103/physreve.76.011713] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2007] [Indexed: 05/16/2023]
Abstract
X-ray diffraction diagrams of undulated smectic phases in bent-core liquid crystals have been theoretically studied. The intensities of the reflections have been obtained for different layer modulations, and a general expression has been deduced for orthogonal cells in terms of the different harmonics of the distortion. The case of sinusoidal modulation is especially simple and has been studied also in oblique cells. High-quality x-ray measurements of three compounds reported in the literature have been analyzed as examples. In all cases it has been deduced that the modulation is sinusoidal and its amplitude has been easily obtained by fitting the experimental intensities. Equatorial (h0) reflections have been also considered to obtain information about the structure of defects at the maxima and minima of the undulation.
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145
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Vázquez H, Dappe YJ, Ortega J, Flores F. Energy level alignment at metal/organic semiconductor interfaces: “Pillow” effect, induced density of interface states, and charge neutrality level. J Chem Phys 2007; 126:144703. [PMID: 17444728 DOI: 10.1063/1.2717165] [Citation(s) in RCA: 168] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A unified model, embodying the "pillow" effect and the induced density of interface states (IDIS) model, is presented for describing the level alignment at a metal/organic interface. The pillow effect, which originates from the orthogonalization of the metal and organic wave functions, is calculated using a many-body linear combination of atomic orbitals Hamiltonian, whereby electron long-range interactions are obtained using an expansion in the metal/organic wave function overlap, while the electronic charge of both materials remains unchanged. This approach yields the pillow dipole and represents the first effect induced by the metal/organic interaction, resulting in a reduction of the metal work function. In a second step, we consider how charge is transferred between the metal and the organic material by means of the IDIS model: Charge transfer is determined by the relative position of the metal work function (corrected by the pillow effect) and the organic charge neutrality level, as well as by an interface parameter S, which measures how this potential difference is screened. In our approach, we show that the combined IDIS-pillow effects can be described in terms of the original IDIS alignment corrected by a screened pillow dipole. For the organic materials considered in this paper, we see that the IDIS dipole already represents most of the realignment induced at the metal/organic interface. We therefore conclude that the pillow effect yields minor corrections to the IDIS model.
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Miano M, Labopin M, Hartmann O, Angelucci E, Cornish J, Gluckman E, Locatelli F, Fischer A, Egeler RM, Or R, Peters C, Ortega J, Veys P, Bordigoni P, Iori AP, Niethammer D, Rocha V, Dini G. Haematopoietic stem cell transplantation trends in children over the last three decades: a survey by the paediatric diseases working party of the European Group for Blood and Marrow Transplantation. Bone Marrow Transplant 2007; 39:89-99. [PMID: 17213848 DOI: 10.1038/sj.bmt.1705550] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This paper describes the trends in haematopoietic stem cell transplantation (HSCT) activity for children in Europe over the last three decades. We analysed 31,713 consecutive paediatric HSCTs reported by the European Group for Blood and Marrow Transplantation (EBMT) centres between 1970 and 2002. Data were taken from the EBMT registry and were compared according to period and centre category (paediatric or combined). Since 1996, there has been a significant increase in the number of HSCTs performed exclusively by paediatric centres, as well as in the number of alternative donor HSCTs, and in the use of peripheral blood stem cells (P<0.0001). The number of allogeneic HSCTs (allo-HSCTs) for acute lymphoblastic leukaemia, acute myeloblastic leukaemia and chronic myeloid leukaemia remained stable, whereas it increased for myelodysplastic syndromes and lymphomas, and decreased significantly for non-malignant diseases (P<0.0001). Multivariate analysis showed that younger age, human leukocyte antigen genoidentical donors, HSCT performed after 1996 and transplant centres performing more than 10 allo-HSCT/year were all associated with decreased transplant-related mortality (TRM) (P<0.0001). The number of autologus HSCTs (auto-HSCTs) for acute leukaemia decreased significantly, whereas it increased for solid tumours (P<0.0001). Multivariate analysis showed that both auto-HSCT performed before 1996 and paediatric solid tumours (P<0.0001) had higher TRM. Indications for paediatric HSCT have changed considerably during the last seven years. These changes provide tools for decision making in health-care planning and counselling.
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Quintero J, Ortega J, Bueno J, Flores S, Roqueta J. Predictive value of indocyanine green clearance in acute liver failure in children: comparison with King's College and Clichy scores. Crit Care 2007. [PMCID: PMC4095451 DOI: 10.1186/cc5558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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148
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Rocha V, Michel G, Kabara N, Arcese W, Ortega J, Iori P, Madero L, Chan K, Locatelli F, Garnier F, Ionescu I, Wernet P, Gluckman E. 22: Outcomes after Unrelated Cord Blood Transplantation in Children with Acute Lymphoblastic Leukemia. Biol Blood Marrow Transplant 2006. [DOI: 10.1016/j.bbmt.2006.08.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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149
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Parra-Blanco A, Nicolas-Perez D, Gimeno-Garcia A, Grosso B, Jimenez A, Ortega J, Quintero E. The timing of bowel preparation before colonoscopy determines the quality of cleansing, and is a significant factor contributing to the detection of flat lesions: A randomized study. World J Gastroenterol 2006; 12:6161-6. [PMID: 17036388 PMCID: PMC4088110 DOI: 10.3748/wjg.v12.i38.6161] [Citation(s) in RCA: 185] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To compare the cleansing quality of polyethylene glycol electrolyte solution and sodium phosphate with different schedules of administration, and to evaluate whether the timing of the administration of bowel preparation affects the detection of polyps.
METHODS: One hundred and seventy-seven consecutive outpatients scheduled for colonoscopy were randomized in one of four groups to receive polyethylene glycol electrolyte solution or oral sodium phosphate with two different timing schedules. Quality of cleansing, polyp detection, and tolerance were evaluated.
RESULTS: Patients receiving polyethylene glycol or sodium phosphate on the same day as the colonoscopy, obtained good to excellent global cleansing scores more frequently than patients who received polyethylene glycol or sodium phosphate on the day prior to the procedure (P < 0.001). Flat lesions, but not flat adenomas, were more frequent in patients prepared on the same day (P = 0.02).
CONCLUSION: The quality of colonic cleansing and the detection of flat lesions are significantly improved when the preparation is taken on the day of the colonoscopy.
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Folcia CL, Etxebarria J, Ortega J, Ros MB. Structural study of a bent-core liquid crystal showing the B1-B2 transition. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 74:031702. [PMID: 17025649 DOI: 10.1103/physreve.74.031702] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2006] [Indexed: 05/12/2023]
Abstract
An experimental study of the B1-B2 transition is carried out in a bent-core liquid crystal. The study is essentially based on x-ray measurements as a function of temperature. The B1-B2 transition is extremely unusual and implies a deep structural change from a columnar phase to a lamellar phase. We have found that the B1 phase in our compound is similar to the so-called B1 reversed phase, with an additional splay of the polarization in the columns. On approaching the B2 phase the width of the cross section of the columns increases. The transition is clearly first order, with a large hysteresis though the enthalpy content is very small. A possible mechanism for the transition is briefly sketched.
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