Estenosis de venas pulmonares sospechada por ecocardiografía de estrés con ejercicio en un paciente post aislamiento de venas pulmonares

Pulmonary veins stenosis (PVS) is a serious complication that has been associated with radiofrequency ablation (RFA) as a treatment of atrial fibrillation. It has an incidence that can be as low as 0.3% but it could be higher because of other variables. The average time for diagnosis is 16 weeks. We present the case of a patient who presented with dyspnea six months post RFA; PVS was suspected in the exercise stress echocardiography performed. We describe the findings that may suggest this complication and present it as a useful tool for the initial assessment of patients with dyspnea post RFA.La estenosis de venas pulmonares (EVP) es una complicación grave que se ha asociado a la ablación por radiofrecuencia (ARF) como tratamiento de la fibrilación auricular (FA). Su incidencia puede ser tan baja como 0.3%, pero podría aumentar por múltiples variables. El tiempo promedio de diagnóstico es de 16 semanas. Presentamos el caso de un paciente que consultó por disnea seis meses después de la ARF, se realizó una ecocardiografía de estrés con ejercicio en la que se sospechó EVP. Se describen los hallazgos que pueden sugerir dicha complicación y proponemos esta herramienta para la valoración inicial de disnea post ARF

Protective role of chlorogenic acid on DNA damage caused by ochratoxin A exposure

Chlorogenic acid (ChlA) has shown short-term protective effects against the cytogenotoxiceffects of ochratoxin A (OTA). The present study evaluated the effect of oraladministration of ChlA in male Wistar rats exposed to OTA. OTA (0.4 mg/kg bw/day), ChlA (5 mg/kg bw/day), or the combination of both, were administered orally toanimals during 28 days. No deaths, decrease in feed consumption or change in the bodyweight of animals were observed in any group. In the OTA-treated group a decrease inlocomotion as well as increased DNA damage in blood, kidney and bone marrow cellswere observed. ChlA alone was not genotoxic for animals. The combination of OTA+ChlA decreased the DNA damage by 37% in blood cells, by 55% in kidney cells andby 80% in bone marrow cells compared to OTA-treated group. In conclusion, oraltreatment with ChlA showed a good protective effect on genotoxicity produced byOTA in rats during 28 days exposure.El ácido clorogé nico (ChlA) mostró efectos protectores a corto plazo contra los efectos citogenotóxicos de ocratoxina A (OTA). En el presente estudio se evaluó si este polifenol mantiene su efecto protector mediante la administración oral en ratas Wistar machos expuestas a OTA. OTA (0,4 mg/kg/día), ChlA (5 mg/kg/día), o la combinación de ambos, fueron administrados a los animales por vía oral durante 28 días. No se observaron muertes, ni disminución en el consumo de alimento, ni cambios en el peso corporal en ningún grupo de animales. En el grupo tratado con OTA se observó disminución en la locomoción, así como daño en el ADN en las cé lulas de sangre, riñó n y mé dula ósea. En los animales que solo recibieron ChlA no se observaron efectos genotóxicos. La combinación de OTA + ChlA disminuyó el daño del ADN en un 37%en las cé lulas sanguíneas, en un 55% en las cé lulas renales y en un 80% en las cé lulas de la mé dula ósea con respecto al grupo tratado con OTA. En conclusión, el tratamiento oral con ChlA mostró buen efecto protector sobre la genotoxicidad producida por OTA en ratas durante 28 días de exposición.Fil: Campra, Noelia Anahí. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Biotecnología Ambiental y Salud - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Biotecnología Ambiental y Salud; ArgentinaFil: Cariddi, Laura Noelia. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Biotecnología Ambiental y Salud - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Biotecnología Ambiental y Salud; ArgentinaFil: Escobar, Franco Matias. Universidad Nacional de Río Cuarto; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Sabini, Maria Carola. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Instituto de Biotecnología Ambiental y Salud - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Biotecnología Ambiental y Salud; ArgentinaFil: Freire de lima, Celio Geraldo. Universidade Federal do Rio de Janeiro; BrasilFil: Decote Ricardo, Debora. Universidade Federal do Rio de Janeiro; BrasilFil: Roma, Dardo Andrés. Universidad Nacional de Río Cuarto; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Mañas, Fernando Javier. Universidad Nacional de Río Cuarto; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Dalcero, Ana Maria. Universidad Nacional de Río Cuarto; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentin

Aprovechamiento de los estériles de Marmato

Resumen del informe del Contrato Interadministrativo No. 297 de 2012 “Alternativas de aprovechamiento del material pétreo resultante de la actividad minera en Marmato, a partir de la realización de estudios mineralógicos y físicos de este, tendientes a contribuir con la generación de nuevos procesos productivos y a la recuperación futura de los cauces y laderas ocupados con la depositación de este tipo de residuos mineros”

Immune protection against Trypanosoma cruzi induced by TcVac4 in a canine model

Chagas disease, caused by Trypanosoma cruzi, is endemic in southern parts of the American continent. Herein, we have tested the protective efficacy of a DNA-prime/T. rangeli-boost (TcVac4) vaccine in a dog (Canis familiaris) model. Dogs were immunized with two-doses of DNA vaccine (pcDNA3.1 encoding TcG1, TcG2, and TcG4 antigens plus IL-12- and GMCSF- encoding plasmids) followed by two doses of glutaraldehyde-inactivated T. rangeli epimastigotes (TrIE); and challenged with highly pathogenic T. cruzi (SylvioX10/4) isolate. Dogs given TrIE or empty pcDNA3.1 were used as controls. We monitored post-vaccination and post-challenge infection antibody response by an ELISA, parasitemia by blood analysis and xenodiagnosis, and heart function by electrocardiography. Post-mortem anatomic and pathologic evaluation of the heart was conducted. TcVac4 induced a strong IgG response (IgG2>IgG1) that was significantly expanded post-infection, and moved to a nearly balanced IgG2/IgG1 response in chronic phase. In comparison, dogs given TrIE or empty plasmid DNA only developed high IgG titers with IgG2 predominance in response to T. cruzi infection. Blood parasitemia, tissue parasite foci, parasite transmission to triatomines, electrocardiographic abnormalities were significantly lower in TcVac4-vaccinated dogs than was observed in dogs given TrIE or empty plasmid DNA only. Macroscopic and microscopic alterations, the hallmarks of chronic Chagas disease, were significantly decreased in the myocardium of TcVac4-vaccinated dogs.We conclude that TcVac4 induced immunity was beneficial in providing resistance to T. cruzi infection, evidenced by control of chronic pathology of the heart and preservation of cardiac function in dogs. Additionally, TcVac4 vaccination decreased the transmission of parasites from vaccinated/infected animals to triatomines.CONACYT PROY No. 156701 UAEM PROY No. 2381/2006U National Institutes of Health/National Institute of Allergy and Infectious Diseases http://www.niaid.nih.gov/Pages/ default.aspx GRANT NUMBER (AI072538) NJG; American Heart Association http://www.heart.org/ HEARTORG/ GRANT NUMBER (0855059F) to NJG

Rol protector del ácido clorogénico sobre el daño del ADN causado por la exposición a ocratoxina A

Chlorogenic acid (ChlA) has shown short-term protective effects against the cytogenotoxic effects of ochratoxin A (OTA). The present study evaluated the effect of oral administration of ChlA in male Wistar rats exposed to OTA. OTA (0.4 mg/kg bw/ day), ChlA (5 mg/kg bw/day), or the combination of both, were administered orally to animals during 28 days. No deaths, decrease in feed consumption or change in the body weight of animals were observed in any group. In the OTA-treated group a decrease in locomotion as well as increased DNA damage in blood, kidney and bone marrow cells were observed. ChlA alone was not genotoxic for animals. The combination of OTA +ChlA decreased the DNA damage by 37% in blood cells, by 55% in kidney cells and by 80% in bone marrow cells compared to OTA-treated group. In conclusion, oral treatment with ChlA showed a good protective effect on genotoxicity produced by OTA in rats during 28 days exposure.El ácido clorogénico (ChlA) mostró efectos protectores a corto plazo contra los efectos citogenotóxicos de ocratoxina A (OTA). En el presente estudio se evaluó si este polifenol mantiene su efecto protector mediante la administración oral en ratas Wistar machos expuestas a OTA. OTA (0,4 mg/kg/día), ChlA (5 mg/kg/día), o la combinación de ambos, fueron administrados a los animales por vía oral durante 28 días. No se observaron muertes, ni disminución en el consumo de alimento, ni cambios en el peso corporal en ningún grupo de animales. En el grupo tratado con OTA se observó disminución en la locomoción, así como daño en el ADN en las células de sangre, riñón y médula ósea. En los animales que solo recibieron ChlA no se observaron efectos genotóxicos. La combinación de OTA + ChlA disminuyó el daño del ADN en un 37%en las células sanguíneas, en un 55% en las células renales y en un 80% en las células de la médula ósea con respecto al grupo tratado con OTA. En conclusión, el tratamiento oral con ChlA mostró buen efecto protector sobre la genotoxicidad producida por OTA en ratas durante 28 días de exposición.Facultad de Ciencias Veterinaria

Estudios de propiedad intelectual

Transcurrida la primera década del siglo XXI, uno de los principales retos que continúa afrontando el derecho es determinar los mecanismos más adecuados para proteger la expresión de las ideas. Mientras algunos opinan que no deberían existir regulaciones que impidan acceder al conocimiento, otros afirman que se trata de un derecho que les asiste a los creadores y a quienes participan en el proceso creativo, razón por la cual las normas deben ser cada vez más protectoras e, incluso, sancionatorias. Son múltiples los tópicos que suscita la mencionada controversia, aplicados a diferentes aspectos de la cotidianeidad, enmarcados principalmente en temas relacionados con la investigación y el desarrollo, el comercio, la cultura y la industria del entretenimiento. Transcurrida la primera década del siglo XXI, uno de los principales retos que continúa afrontando el derecho es determinar los mecanismos más adecuados para proteger la expresión de las ideas

The Long-Baseline Neutrino Experiment: Exploring Fundamental Symmetries of the Universe

The preponderance of matter over antimatter in the early Universe, the dynamics of the supernova bursts that produced the heavy elements necessary for life and whether protons eventually decay --- these mysteries at the forefront of particle physics and astrophysics are key to understanding the early evolution of our Universe, its current state and its eventual fate. The Long-Baseline Neutrino Experiment (LBNE) represents an extensively developed plan for a world-class experiment dedicated to addressing these questions. LBNE is conceived around three central components: (1) a new, high-intensity neutrino source generated from a megawatt-class proton accelerator at Fermi National Accelerator Laboratory, (2) a near neutrino detector just downstream of the source, and (3) a massive liquid argon time-projection chamber deployed as a far detector deep underground at the Sanford Underground Research Facility. This facility, located at the site of the former Homestake Mine in Lead, South Dakota, is approximately 1,300 km from the neutrino source at Fermilab -- a distance (baseline) that delivers optimal sensitivity to neutrino charge-parity symmetry violation and mass ordering effects. This ambitious yet cost-effective design incorporates scalability and flexibility and can accommodate a variety of upgrades and contributions. With its exceptional combination of experimental configuration, technical capabilities, and potential for transformative discoveries, LBNE promises to be a vital facility for the field of particle physics worldwide, providing physicists from around the globe with opportunities to collaborate in a twenty to thirty year program of exciting science. In this document we provide a comprehensive overview of LBNE's scientific objectives, its place in the landscape of neutrino physics worldwide, the technologies it will incorporate and the capabilities it will possess.Comment: Major update of previous version. This is the reference document for LBNE science program and current status. Chapters 1, 3, and 9 provide a comprehensive overview of LBNE's scientific objectives, its place in the landscape of neutrino physics worldwide, the technologies it will incorporate and the capabilities it will possess. 288 pages, 116 figure

A search for ultra-high-energy photons at the Pierre Auger Observatory exploiting air-shower universality

The Pierre Auger Observatory is the most sensitive detector to primary photons with energies above ∼0.2 EeV. It measures extensive air showers using a hybrid technique that combines a fluorescence detector (FD) with a ground array of particle detectors (SD). The signatures of a photon-induced air shower are a larger atmospheric depth at the shower maximum (X$_{max}$) and a steeper lateral distribution function, along with a lower number of muons with respect to the bulk of hadron-induced background. Using observables measured by the FD and SD, three photon searches in different energy bands are performed. In particular, between threshold energies of 1-10 EeV, a new analysis technique has been developed by combining the FD-based measurement of X$_{max}$ with the SD signal through a parameter related to its muon content, derived from the universality of the air showers. This technique has led to a better photon/hadron separation and, consequently, to a higher search sensitivity, resulting in a tighter upper limit than before. The outcome of this new analysis is presented here, along with previous results in the energy ranges below 1 EeV and above 10 EeV. From the data collected by the Pierre Auger Observatory in about 15 years of operation, the most stringent constraints on the fraction of photons in the cosmic flux are set over almost three decades in energy