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Search Results: 1 - 10 of 461945 matches for " A. Berra "
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Los suelos de la cuenca del Arroyo Maure, provincia de Mendoza
Hector T. Masotta,A. B. Berra
Multequina , 1996,
Abstract: Al oeste de la ciudad de Mendoza y de los Departamentos de Las Heras, Godoy Cruz y Luján, se extiende una región pedemontana de condiciones climáticas áridas que posee alto riesgo de avenidas torrenciales sobre el conglomerado urbano. El estudio de los suelos, realizado para planificar el manejo de la cuenca del Arroyo Maure, consiste en un mapeo de suelos en escala 1:25.000 sobre una superficie de 5.160 ha que abarca la cuenca nombrada. Los suelos han sido clasificados a nivel de Subgrupo (Soil Taxonomy, 1975); corresponden a Entisoles pertenecientes a los Subgrupops Torrifluventes típicos, Torriortentes típicos y T. líticos. Los suelos, desarrollados en condiciones áridas, han formado perfiles del tipo AC, con epipedón ócrico y ausencia de horizontes diagnósticos subsuperficiales. Las unidades cartográficas se han relacionado con unidades de paisaje. La erosión está muy extendida en el área y la alta erosionabilidad de los suelos contribuye a la aceleración del proceso erosivo resultante del impacto antrópico actual.
SNOMED: la nomenclatura sistematizada de medicina del College of American Pathologists. II. Desarrollo de la versión en espa ol de SNOMED: aspectos generales y relacionados con el método de traducción
Guillermo A. Reynoso,M. Carolina Berra,Olga Burlak,Patricia Houghton
Panace@ : Revista de Medicina, Lenguaje y Traducción , 2004,
Abstract:
Rese a del libro "Derecho Ambiental" de Marcelo López Alfonsín.
Elisabeth Berra
Revista de Derecho Ambiental de la Universidad de Palermo , 2013,
Abstract:
Design, construction and tests of a 3 GHz proton linac booster (LIBO) for cancer therapy
Paolo Berra
Physics , 2007,
Abstract: In the last ten years the use of proton beams in radiation therapy has become a clinical tool for treatment of deep-seated tumours. LIBO is a RF compact and low cost proton linear accelerator (SCL type) for hadrontherapy. It is conceived by TERA Foundation as a 3 GHz Linac Booster, to be mounted downstream of an existing cyclotron in order to boost the energy of the proton beam up to 200 MeV, needed for deep treatment (~25 cm) in the human body. With this solution it is possible to transform a low energy commercial cyclotron, normally used for eye melanoma therapy, isotope production and nuclear physics research, into an accelerator for deep-seated tumours. A prototype module of LIBO has been built and successfully tested with full RF power at CERN and with proton beam at INFN Laboratori Nazionali del Sud (LNS) in Catania, within an international collaboration between TERA Foundation, CERN, the Universities and INFN groups of Milan and Naples. The mid-term aim of the project is the technology transfer of the accumulated know-how to a consortium of companies and to bring this novel medical tool to hospitals. The design, construction and tests of the LIBO prototype are described in detail.
Gabor Frame Decomposition of Evolution Operators and Applications
Michele Berra
Mathematics , 2013, DOI: 10.1007/s11868-014-0090-8
Abstract: We compute the Gabor matrix for Schr\"odinger-type evolution operators. Precisely, we analyze the Heat Equation, already presented in \cite{2012arXiv1209.0945C}, giving the exact expression of the Gabor matrix which leads to better numerical evaluations. Then, using asymptotic integration techniques, we obtain an upper bound for the Gabor matrix in one-dimension for the generalized Heat Equation, new in the literature. Using Maple software, we show numeric representations of the coefficients' decay. Finally, we show the super-exponential decay of the coefficients of the Gabor matrix for the Harmonic Repulsor, together with some numerical evaluations. This work is the natural prosecution of the ideas presented in \cite{2012arXiv1209.0945C} and \cite{MR2502369}.
The impact of vitamin D deficiency on immune T cells in asthmatic children: a case-control study
Maalmi H, Berra es A, Tangour E, Ammar J, Abid H, Hamzaoui K, Hamzaoui A
Journal of Asthma and Allergy , 2012, DOI: http://dx.doi.org/10.2147/JAA.S29566
Abstract: ct of vitamin D deficiency on immune T cells in asthmatic children: a case-control study Original Research (4185) Total Article Views Authors: Maalmi H, Berra es A, Tangour E, Ammar J, Abid H, Hamzaoui K, Hamzaoui A Published Date May 2012 Volume 2012:5 Pages 11 - 19 DOI: http://dx.doi.org/10.2147/JAA.S29566 Received: 29 December 2011 Accepted: 14 February 2012 Published: 09 May 2012 Ha fa Maalmi,1,2 Anissa Berra es,1,2,3 Eya Tangour,1,2,3 Jamel Ammar,1,2,3 Hanadi Abid,1,2,3 Kamel Hamzaoui,1,2 Agnes Hamzaoui1,2,3 1Department of Basic Sciences, Medicine School of Tunis, University Tunis El Manar, Tunis; 2Unit Research, Homeostasis and Cell Dysfunction, Ariana; 3Department of Pneumopediatry, A Mami Hospital, Ariana, Tunisia Background: Vitamin D exerts profound effects on both adaptive and innate immune functions involved in the development and course of autoimmune and inflammatory diseases. As the incidence of vitamin D insufficiency is surprisingly high in the general population, experimental studies have started to investigate whether vitamin D levels (measured as serum 25 hydroxy vitamin D-25[OH]D) are correlated with immune cells and clinical parameters. Purpose: The aim of the present research was to investigate serum vitamin D status in a case-control study in children with asthma and to study associations between vitamin D levels and certain immunological parameters. Materials and methods: A case control study of thirty-nine children with clinically controlled asthma was enrolled to assess the relationship between serum vitamin D concentrations and disease activity. Vitamin D was assayed with a radioimmunoassay kit. We evaluated the relationship between vitamin D concentrations and forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), and the FEV1/FVC ratio. Correlations between inflammatory mediators, Th1, Th2, Th17, and regulatory T cells (Treg) and vitamin D were investigated. Results: Only 15.38% of our asthmatic children had a sufficient serum 25(OH)D (≥30 ng/mL) whereas 80% of healthy children expressed sufficient levels. Deficient values of vitamin D (<20 ng/mL) were observed in 17 (43.59%) asthmatic patients (14.40 ± 3.30 ng/mL; P = 0.0001). Deficiency was not observed in controls. Th1/Th2 ratio was significantly correlated to 25(OH)D level (r = 0.698; P = 0.0001). A significant negative correlation was observed between serum interleukin-17 and vitamin D levels in young asthmatics (r = -0.617; P = 0.001). A significant correlation was observed between CD25+Foxp3+ Treg cells and vitamin D values in asthmatics (r = 0.368; P = 0.021). Conclusion: Even in a southern Mediterranean country, hypovitaminosis D is frequent in children with asthma. Our findings suggest that vitamin D is an important promoter of T cell regulation in vivo in young asthmatics.
Transcriptional characteristics of CD4+ T cells in young asthmatic children: RORC and FOXP3 axis
Hamzaoui A, Maalmi H, Berra es A, Abid H, Ammar J, Hamzaoui K
Journal of Inflammation Research , 2011, DOI: http://dx.doi.org/10.2147/JIR.S25314
Abstract: anscriptional characteristics of CD4+ T cells in young asthmatic children: RORC and FOXP3 axis Original Research (2969) Total Article Views Authors: Hamzaoui A, Maalmi H, Berra es A, Abid H, Ammar J, Hamzaoui K Published Date November 2011 Volume 2011:4 Pages 139 - 146 DOI: http://dx.doi.org/10.2147/JIR.S25314 Agnes Hamzaoui1,2,*, Ha fa Maalmi1,*, Anissa Berra es1,2, Hanadi Abid1,2, Jamel Ammar1,2, Kamel Hamzaoui1 1Department of Pediatrics and Respiratory Disease, Homeostasis and Cell Dysfunction Unit Research, Abderrahman Mami Hospital, Ariana, Tunisia; 2Faculty of Medicine of Tunis, Tunis El Manar University, Tunis, Tunisia *These authors contributed to this work equally Background: Asthma is a chronic inflammatory disorder, hypothetically caused by autoreactive Th2 cells, whereas Th1 and regulatory T cells may confer protection. The development of Th subpopulations is dependent on the expression of lineage-specific transcription factors. Purpose: This study aimed to assess the balance of CD4+ T cell populations in asthmatic children. Methods: Peripheral blood mononuclear cells (PBMC) mRNA expression was assessed in 30 asthmatic children (18 patients with mild asthma and 12 with moderate asthma). Real-time polymerase chain reaction (RT-PCR) quantified TBX21, GATA-3, RORC, FOXP3, and EBI3 mRNA expression. Intracellular cytokine expression of IL-2, IL-4, IL-10, and IFN-γ in CD4+ T cells in asthmatic children was measured by flow cytometry. IL-6 and IL-17 cytokines were assessed in serum by enzyme-linked immunosorbent assay (ELISA). Results: A significant increase was found in the percentage of CD4+ and CD8+ T cell-producing IL-4, IL-6, and IL-17. A decreased percentage of CD4+ producing IFN-γ in asthmatic children was found. Expression of GATA-3 (Th2), retinoid-related orphan receptor C (RORC) (Th17), and EBI3 were increased in asthmatic patients compared to healthy controls. Expression of FOXP3 (Treg) and TBX21 (Th1) were decreased (P < 0.0001 and P < 0.0001) in asthmatic children. Analysis of transcription factor ratios revealed an increase in the RORC/FOXP3 (P = 0.0001), and a significant decrease of TBX21/GATA-3 (P = 0.0001) ratios in patients with asthma. Conclusion: Young asthmatics were characterized by increased IL-4 production and low IFN-γ synthesis. The increased serum IL-17 and IL-6 levels sustained an inflammatory environment in young asthmatics. The results indicate that FOXP3 and RORC mRNA expression could be associated with the sustained inflammatory process, transduced by low immune tolerance by Treg cells. The TBX21/GATA-3 and RORC/FOXP3 ratios dysregulation in asthmatics is consistent with the plasticity existing between Th1, Th17, and Treg cells during inflammation.
Transcriptional characteristics of CD4+ T cells in young asthmatic children: RORC and FOXP3 axis
Hamzaoui A,Maalmi H,Berraïes A,Abid H
Journal of Inflammation Research , 2011,
Abstract: Agnes Hamzaoui1,2,*, Ha fa Maalmi1,*, Anissa Berra es1,2, Hanadi Abid1,2, Jamel Ammar1,2, Kamel Hamzaoui11Department of Pediatrics and Respiratory Disease, Homeostasis and Cell Dysfunction Unit Research, Abderrahman Mami Hospital, Ariana, Tunisia; 2Faculty of Medicine of Tunis, Tunis El Manar University, Tunis, Tunisia *These authors contributed to this work equallyBackground: Asthma is a chronic inflammatory disorder, hypothetically caused by autoreactive Th2 cells, whereas Th1 and regulatory T cells may confer protection. The development of Th subpopulations is dependent on the expression of lineage-specific transcription factors.Purpose: This study aimed to assess the balance of CD4+ T cell populations in asthmatic children.Methods: Peripheral blood mononuclear cells (PBMC) mRNA expression was assessed in 30 asthmatic children (18 patients with mild asthma and 12 with moderate asthma). Real-time polymerase chain reaction (RT-PCR) quantified TBX21, GATA-3, RORC, FOXP3, and EBI3 mRNA expression. Intracellular cytokine expression of IL-2, IL-4, IL-10, and IFN-γ in CD4+ T cells in asthmatic children was measured by flow cytometry. IL-6 and IL-17 cytokines were assessed in serum by enzyme-linked immunosorbent assay (ELISA).Results: A significant increase was found in the percentage of CD4+ and CD8+ T cell-producing IL-4, IL-6, and IL-17. A decreased percentage of CD4+ producing IFN-γ in asthmatic children was found. Expression of GATA-3 (Th2), retinoid-related orphan receptor C (RORC) (Th17), and EBI3 were increased in asthmatic patients compared to healthy controls. Expression of FOXP3 (Treg) and TBX21 (Th1) were decreased (P < 0.0001 and P < 0.0001) in asthmatic children. Analysis of transcription factor ratios revealed an increase in the RORC/FOXP3 (P = 0.0001), and a significant decrease of TBX21/GATA-3 (P = 0.0001) ratios in patients with asthma.Conclusion: Young asthmatics were characterized by increased IL-4 production and low IFN-γ synthesis. The increased serum IL-17 and IL-6 levels sustained an inflammatory environment in young asthmatics. The results indicate that FOXP3 and RORC mRNA expression could be associated with the sustained inflammatory process, transduced by low immune tolerance by Treg cells. The TBX21/GATA-3 and RORC/FOXP3 ratios dysregulation in asthmatics is consistent with the plasticity existing between Th1, Th17, and Treg cells during inflammation.Keywords: RORC, FOXP3, asthma, transcription factors
Adaptación transcultural del cuestionario KIDSCREEN para medir calidad de vida relacionada con la salud en población argentina de 8 a 18 a?os
Berra,Silvina; Bustingorry,Vanesa; Henze,Carolina; Díaz,María del Pilar; Rajmil,Luis; Butinof,Mariana;
Archivos argentinos de pediatr?-a , 2009,
Abstract: background. health related quality of life (hrqol) measures are increasingly used in research and clinical practice. the kidscreen is a questionnaire developed in europe for an 8 to 18 year-old population. objective. to cross-culturally adapt this questionnaire for the argentinean population, and to evaluate its cultural adequacy and semantic equivalence against the original version. methods. forward and backward translation according to international recommendations for cross-cultural adaptation of questionnaires, including the translation by professional linguists, cognitive interviews with people of different ages, gender and socioeconomic status to analyze cultural adequacy, and comparison of the argentinean with the original versions to establish semantic equivalence. results. the language required adaptation in the use of pronouns and verb tenses. most of the items were considered to have low translation difficulty and high semantic equivalence. boys and girls 8-11 years (n= 7), 12-15 years (n= 7), and 16-18 years (n= 2) participated in the interviews, as well as 6 mothers. there were no major difficulties in understanding, but younger children being in the lower socioeconomic status had some difficulties to answer the questionnaire. eight questions were modified to achieve greater semantic equivalence. conclusions. the argentinean version of the kidscreen questionnaire obtained through cross-cultural adaptation process, was equivalent to the european version. future studies should establish its reliability and validity. it provides a useful measure of hrqol for studies in clinical, school or community settings, with the possibility to establish international comparisons.
Patología del hueso temporal en pediatría: hallazgos tomográficos característicos
Berra,Paola; Rodríguez,María Alejandra; Zerba,Mariana; Santos Quesada,Maribel; Lonegro,Leopoldo;
Revista argentina de radiolog?-a , 2012,
Abstract: the temporal bone is the seat of frequent otologic disorders in children. objective. to report the statistics and description of characteristic computed tomography (ct) findings of temporal bone pathology in a pediatric population. material and methods. retrospective, longitudinal and descriptive review of 64 medical records taken between january 2008 and april 2011 at the pediatric hospital pedro elizalde. the classification of diseases was: inflammatory (infectious and noninfectious), congenital, histiocytosis, tumor infiltration and traumatic. results. males: 64%, age range: 1 month to 14 years (mean: 6.1 years). we found 53% inflammatory infectious conditions, 36% inflammatory noninfectious, 4.6% congenital, 1.5% histiocytosis, 3% tumor infiltration, and 1.5% traumatic. infections disease was the most prevalent pathology in children under 5 years (otomastoiditis 43.6%). cholesteatoma constituted the major non-infectious inflammatory condition in the age range from 6 to 14 (36%). neoplasms were represented by secondary infiltration of nasopharyngeal angiofibroma or neuroblastoma metastasis. conclusion. acute otomastoiditis and cholesteatoma were the most common otologic pathology in the pediatric population and require ct. in the cases reviewed, ct diagnosis was consistent with clinical, surgical and / or pathology findings.
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