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Search Results: 1 - 10 of 252660 matches for " Luis R. Carrasco "
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A Holographic Path to the Turbulent Side of Gravity
Stephen R. Green,Federico Carrasco,Luis Lehner
Physics , 2013, DOI: 10.1103/PhysRevX.4.011001
Abstract: We study the dynamics of a 2+1 dimensional relativistic viscous conformal fluid in Minkowski spacetime. Such fluid solutions arise as duals, under the "gravity/fluid correspondence", to 3+1 dimensional asymptotically anti-de Sitter (AAdS) black brane solutions to the Einstein equation. We examine stability properties of shear flows, which correspond to hydrodynamic quasinormal modes of the black brane. We find that, for sufficiently high Reynolds number, the solution undergoes an inverse turbulent cascade to long wavelength modes. We then map this fluid solution, via the gravity/fluid duality, into a bulk metric. This suggests a new and interesting feature of the behavior of perturbed AAdS black holes and black branes, which is not readily captured by a standard quasinormal mode analysis. Namely, for sufficiently large perturbed black objects (with long-lived quasinormal modes), nonlinear effects transfer energy from short to long wavelength modes via a turbulent cascade within the metric perturbation. As long wavelength modes have slower decay, this lengthens the overall lifetime of the perturbation. We also discuss various implications of this behavior, including expectations for higher dimensions, and the possibility of predicting turbulence in more general gravitational scenarios.
Who Should Pay for Global Health, and How Much?
Luis R. Carrasco ,Richard Coker,Alex R. Cook
PLOS Medicine , 2013, DOI: 10.1371/journal.pmed.1001392
Abstract:
Hernia traumática de pared abdominal secundaria a atrición por tronco de árbol Traumatic abdominal wall hernia. Case report
JUAN LUIS MORALES G,CATALINA CARRASCO J,CARLA CARVAJAL R,JOSé HERRERA V
Revista Chilena de Cirugía , 2011,
Abstract: Las hernias traumáticas de pared abdominal (HTPA) son una patología poco frecuente. Se definen como la rotura musculofascial causada por un traumatismo directo, sin penetración de la piel ni evidencia de hernia previa en el sitio de la lesión. El 78% son causadas por accidentes viales y en menor frecuencia por patadas de animales, caídas de altura, traumas deportivos, utensilios profesionales y aplastamientos. Presentamos el caso de un paciente masculino de 34 a os derivado al Servicio de Urgencia del Hospital de Chillan por atrición toracoabdominal derecha, en faena forestal, cuyo estudio tomográfico revela gran defecto de músculos oblicuos y transversos derechos con herniación de colon ascendente hacia la pared abdominal. We report a 34 years old male that while working in forest activities, suffered a blunt trauma caused by the trunk of a tree. On abdominal examination, a bulging on the right upper quadrant with ecchymoses was noted. And abdominal CAT scan showed a great defect of right oblique and transverse abdominis muscles with herniation of the ascending colon. The patient was operated, finding a hemoperitoneum. The abdominal cavity was washed thoroughly and the wall defect was covered with a mesh. The patient had an uneventful postoperative recovery and was discharged nine days later.
Hepatocarcinoma en hígado no cirrótico Hepatocellular carcinoma in a non cirrhotic liver
José Luis Galindo R,Juan José Lombardi A,Aníbal Larenas J,Gonzalo Carrasco A
Revista Chilena de Cirugía , 2012,
Abstract: Introducción: El Carcinoma Hepatocelular (HCC), tumor hepático primario más frecuente, se presenta en general en hígados cirróticos. Un porcentaje menor se desarrolla en pacientes sin cirrosis, en los cuales deben buscarse otras etiologías. Paciente y Método: Se presenta un caso clínico y las características anato-mopatológicas de una paciente con hepatocarcinoma e hígado no cirrótico tratada en nuestro centro. Mujer de 62 a os, con historia de dolor abdominal y baja de peso. Estudio por imágenes revela masa hepática de aproximadamente 8 cm de diámetro mayor, en segmentos II, III y IV, sugerente de HCC. Resultados: Se realiza hepatectomía izquierda. Evoluciona de forma satisfactoria en el postoperatorio. La biopsia muestra un HCC moderada a pobremente diferenciado. El tejido no tumoral es normal, con gránulos intracitoplasmáticos Pas y Pas diastasa (+). Inmunohistoquímica identifica gránulos intracitoplasmáticos de antitripsina, con lo que se confirma la sospecha diagnóstica de déficit de α-1 antitripsina. Background: The appearance of hepatocellular carcinoma in non-cirrhotic livers is uncommon. Material and Method: We report a 62 years old woman presenting with a liver mass that was subjected to a left hepatectomy. Results: The pathology report disclosed a poorly to moderately differentiated hepatocellular carcinoma. The surrounding liver tissue was normal. Immunohistochemistry identified intracytoplasmic α-1 antitrypsin granules, confirming the suspicion of α-1 antitrypsin deficiency.
Cistitis eosinofílica: revisión y reporte de dos casos
Ebel Sepulveda,Luis F.; Foneron,A.; Troncoso,L.; Ca?oles,R.; Carrasco,C.; Hornig,A.; Gil,G.; Corti,D.;
Actas Urológicas Espa?olas , 2009, DOI: 10.4321/S0210-48062009000400018
Abstract: eosinophilic cystitis is a low frequency disease, with less than 200 reported cases in the world. it is characterized by a bladder wall inflammation, mainly by eosinophils, with fibrosis and muscle necrosis areas. its origin seems to be immunological, although the triggers are not well known. several predispose factor have been described such as allergic diseases, bladder injuries, drugs, infections, etc. it affects patient of all ages, mainly adults. it presents with frecuency, haematuria and suprapubic pain. other less frequent symptoms are disuria, urinary retention, nicturia, and enuresis. the laboratory study (urinalysis, urinalysis and haemogram) and radiology (ultrasound, intravenous pyelography, computed tomography and nuclear magnetic resonance) are non specific. the lesions observed in the cystoscopy could emulate other diseases, that why the proper diagnostic is the histological analysis. the management could be observation o antihistaminic, anti-inflammatory and corticoid treatment. in refractory cases, surgery is an alternative. in this work, two male adult cases are reported with their symptoms, studies and management.
Hernia traumática de pared abdominal secundaria a atrición por tronco de árbol
MORALES G,JUAN LUIS; CARRASCO J,CATALINA; CARVAJAL R,CARLA; HERRERA V,JOSé; MARíN B,RODOLFO;
Revista chilena de cirugía , 2011, DOI: 10.4067/S0718-40262011000100017
Abstract: we report a 34 years old male that while working in forest activities, suffered a blunt trauma caused by the trunk of a tree. on abdominal examination, a bulging on the right upper quadrant with ecchymoses was noted. and abdominal cat scan showed a great defect of right oblique and transverse abdominis muscles with herniation of the ascending colon. the patient was operated, finding a hemoperitoneum. the abdominal cavity was washed thoroughly and the wall defect was covered with a mesh. the patient had an uneventful postoperative recovery and was discharged nine days later.
Simple Clinical and Laboratory Predictors of Chikungunya versus Dengue Infections in Adults
Vernon J. Lee ,Angela Chow,Xiaohui Zheng,Luis R. Carrasco,Alex R. Cook,David C. Lye,Lee-Ching Ng,Yee-Sin Leo
PLOS Neglected Tropical Diseases , 2012, DOI: 10.1371/journal.pntd.0001786
Abstract: Background Dengue and chikungunya are co-circulating vector-borne diseases with substantial overlap in clinical presentations. It is important to differentiate between them during first presentation as their management, especially for dengue hemorrhagic fever (DHF), is different. This study compares their clinical presentation in Singapore adults to derive predictors to assist doctors in diagnostic decision-making. Methods We compared 117 patients with chikungunya infection diagnosed with reverse transcription-polymerase chain reaction (RT-PCR) with 917 dengue RT-PCR-positive adult patients (including 55 with DHF). We compared dengue fever (DF), DHF, and chikungunya infections by evaluating clinical characteristics of dengue and chikungunya; developing classification tools via multivariate logistic regression models and classification trees of disease etiology using clinical and laboratory factors; and assessing the time course of several clinical variables. Findings At first presentation to hospital, significantly more chikungunya patients had myalgia or arthralgia, and fewer had a sore throat, cough (for DF), nausea, vomiting, diarrhea, abdominal pain, anorexia or tachycardia than DF or DHF patients. From the decision trees, platelets <118×109/L was the only distinguishing feature for DF versus chikungunya with an overall correct classification of 89%. For DHF versus chikungunya using platelets <100×109/L and the presence of bleeding, the overall correct classification was 98%. The time course analysis supported platelet count as the key distinguishing variable. Interpretation There is substantial overlap in clinical presentation between dengue and chikungunya infections, but simple clinical and laboratory variables can predict these infections at presentation for appropriate management.
Predictive Tools for Severe Dengue Conforming to World Health Organization 2009 Criteria
Luis R. Carrasco,Yee Sin Leo ,Alex R. Cook,Vernon J. Lee,Tun L. Thein,Chi Jong Go,David C. Lye
PLOS Neglected Tropical Diseases , 2014, DOI: 10.1371/journal.pntd.0002972
Abstract: Background Dengue causes 50 million infections per year, posing a large disease and economic burden in tropical and subtropical regions. Only a proportion of dengue cases require hospitalization, and predictive tools to triage dengue patients at greater risk of complications may optimize usage of limited healthcare resources. For severe dengue (SD), proposed by the World Health Organization (WHO) 2009 dengue guidelines, predictive tools are lacking. Methods We undertook a retrospective study of adult dengue patients in Tan Tock Seng Hospital, Singapore, from 2006 to 2008. Demographic, clinical and laboratory variables at presentation from dengue polymerase chain reaction-positive and serology-positive patients were used to predict the development of SD after hospitalization using generalized linear models (GLMs). Principal findings Predictive tools compatible with well-resourced and resource-limited settings – not requiring laboratory measurements – performed acceptably with optimism-corrected specificities of 29% and 27% respectively for 90% sensitivity. Higher risk of severe dengue (SD) was associated with female gender, lower than normal hematocrit level, abdominal distension, vomiting and fever on admission. Lower risk of SD was associated with more years of age (in a cohort with an interquartile range of 27–47 years of age), leucopenia and fever duration on admission. Among the warning signs proposed by WHO 2009, we found support for abdominal pain or tenderness and vomiting as predictors of combined forms of SD. Conclusions The application of these predictive tools in the clinical setting may reduce unnecessary admissions by 19% allowing the allocation of scarce public health resources to patients according to the severity of outcomes.
M82 AS A GALAXY: MORPHOLOGY AND STELLAR CONTENT OF THE DISK AND HALO
Y. D. Mayya,Luis Carrasco
Revista mexicana de astronomía y astrofísica , 2009,
Abstract: For decades, the nuclear starburst has taken all the limelight in M82 with very little discussion on M82 as a galaxy. The situation is changing over the last decade, with the publication of some important results on the morphology and stellar content of its disk and halo. In this review, we discuss these recent ndings in the framework of M82 as a galaxy. It is known for almost half a century that M82 as a galaxy doesn't follow the trends expected for normal galaxies that had prompted the morphologists to introduce a separate morphological type under the name Irr II or amorphous. It is now being understood that the main reasons behind its apparently distinct morphological appearance are its peculiar star formation history, radial distribution of gas density and the form of the rotation curve. The disk formed almost all of its stars through a burst mode around 500 Myr ago, with the disk star formation completely quenched around 100 Myr ago. The fossil record of the disk-wide burst lies in the form of hundreds of compact star clusters, similar in mass to that of the globular clusters in the Milky Way, but an order of magnitude younger. The present star formation is restricted entirely to the central 500 pc zone, that contains more than 200 young compact star clusters. The disk contains a non-star-forming spiral arm, hidden from the optical view by a combination of extinction and high inclination to the line of sight. The halo of M82 is also unusual in its stellar content, with evidence for star formation, albeit at low levels, occurring continuously for over a gigayear. We carefully examine each of the observed abnormality to investigate the overall e ect of interaction on the evolution of M82.
M82 as a Galaxy: Morphology and Stellar Content of the Disk and Halo
Y. Divakara Mayya,Luis Carrasco
Physics , 2009,
Abstract: For decades, the nuclear starburst has taken all the limelight in M82 with very little discussion on M82 as a galaxy. The situation is changing over the last decade, with the publication of some important results on the morphology and stellar content of its disk and halo. In this review, we discuss these recent findings in the framework of M82 as a galaxy. It is known for almost half a century that M82 as a galaxy doesn't follow the trends expected for normal galaxies that had prompted the morphologists to introduce a separate morphological type under the name Irr II or amorphous. It is now being understood that the main reasons behind its apparently distinct morphological appearance are its peculiar star formation history, radial distribution of gas density and the form of the rotation curve. The disk formed almost all of its stars through a burst mode around 500 Myr ago, with the disk star formation completely quenched around 100 Myr ago. The fossil record of the disk-wide burst lies in the form of hundreds of compact star clusters, similar in mass to that of the globular clusters in the Milky Way, but an order of magnitude younger. The present star formation is restricted entirely to the central 500 pc zone, that contains more than 200 young compact star clusters. The disk contains a non-star-forming spiral arm, hidden from the optical view by a combination of extinction and high inclination to the line of sight. The halo of M82 is also unusual in its stellar content, with evidence for star formation, albeit at low levels, occurring continuously for over a gigayear. We carefully examine each of the observed abnormality to investigate the overall effect of interaction on the evolution of M82.
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