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Search Results: 1 - 10 of 10097 matches for " Sergio Canovas "
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Juegos edénicos en Pantaleón y las Visitadoras, de Mario Vargas Llosa. Una recapitulación
Acta Literaria , 2000,
Septal rupture with right ventricular wall dissection after myocardial infarction
Carlos J Soriano, José L Pérez-Boscá, Sergio Canovas, Francisco Ridocci, Pau Federico, Ildefonso Echanove, Rafael Paya
Cardiovascular Ultrasound , 2005, DOI: 10.1186/1476-7120-3-33
Abstract: We present a case of a 59-year-old man who had a septal rupture with right ventricular wall dissection after inferior and right ventricular myocardial infarction. Transthoracic echocardiography, as first line examination, established the diagnosis, and prompt surgical repair allowed long-term survival in our patient.Outcomes after right ventricular intramyocardial dissection following septal rupture related to myocardial infarction has been reported to be dismal. Early recognition of this complication using transthoracic echocardiography at patient bedside, and prompt surgical repair are the main factors to achieve long-term survival in these patients.The occurrence of ventricular septal rupture after acute myocardial infarction is an uncommon complication in the reperfusion era [1], however, this condition implies a high mortality rate, even after surgical repair [2]. In patients with inferior myocardial infarction, septal rupture generally involves basal inferoposterior septum, and the communicating tract between left and right ventricle is often serpiginous with a variable degree of right ventricular wall extension [3]. Right ventricular wall dissection following septal rupture related to previous myocardial infarction has been reported in a very few cases [4-6], in many of them this condition has been diagnosed in post-mortem studies [4]. In a recent report long-term survival has been achieved after promptly echocardiographic diagnosis and surgical repair [6].A 59-year-old man was admitted to Coronary Care Unit because of suspected ST-segment-elevation myocardial infarction. The patient was complaining of typical coronary chest pain during the last twelve hours. He had a history of dyslipidemia, type 2 diabetes mellitus, smoking habit and a transient ischemic attack without any sensitive or motor squele one year ago. On admission, his blood pressure was 100/60 and heart rate was 110 beats per minute. Cardiac examination revealed jugular vein distension, and no s
Malignant cell interactions with cells of the hepatic sinusoids mediate primarily the development of colorectal cancer liver metastasis
K. Paschos,D. Canovas,N. Bird
Annals of Gastroenterology , 2008,
Abstract: Metastases are the main cause of death for patients with colorectal cancer and the liver is the primary host organ. However, macrometastases constitute the final step of a complicated and poorly-defined multistage process, named invasion- metastasis cascade. Before they metastasise, malignant cells undergo partial or complete transformation and acquire new properties. They present intensive growth, provoke neoangiogenesis, invade the surrounding extracellular matrix, detach from their primary site and intravasate. Some succeed in surviving in the systemic circulation, adhere to hepatic sinusoids and extravasate. Eventually, by evading the hepatic immune system, few cancer cells colonise the liver and form metastases. While a vast number of cells leave the primary tumour and intravasate, only a small minority reaches the liver blood network. Thus, the possibility of metastases formation is very low. The entrapment of colorectal cancer cells in the sinusoids and their interactions with the resident cells are considered very important initial steps in the liver invasion. Sinusoidal endothelial cells, pit cells, stellate cells and Kupffer cells all mediate the metastatic process in complex ways, through a variety of biological compounds and intercellular actions. Current research aims to elucidate the role of these cells in colorectal cancer liver metastasis.
Desirability of a standard notation for fisheries assessment  [PDF]
Sergio Ragonese, Sergio Vitale
Agricultural Sciences (AS) , 2013, DOI: 10.4236/as.2013.48057

The worldwide increase of the publications concerning the assessment of marine renewable living resources is highlighting long-standing problems with symbols and annotations. Starting from the symbols presented within the classic fisheries masterpieces produced, mainly in the fifty of the last century, a first “Milestone” list was organised. Thereafter, the pertinent literature was (not exhaustively) browsed in order to integrate this Milestone list on the base of a set of decisional criteria. The present contribution consists in using the Latin letters as well established symbols for the corresponding parameters, leaving free to specific use (with few historical exceptions) the Greek letters in view to open a discussion among all the fisheries scientists and bodies in order to move towards a common language and better communication standards.

A Hybrid Stochastic Approach for Self-Location of Wireless Sensors in Indoor Environments
Jaime Lloret,Jesus Tomas,Miguel Garcia,Alejandro Canovas
Sensors , 2009, DOI: 10.3390/s90503695
Abstract: Indoor location systems, especially those using wireless sensor networks, are used in many application areas. While the need for these systems is widely proven, there is a clear lack of accuracy. Many of the implemented applications have high errors in their location estimation because of the issues arising in the indoor environment. Two different approaches had been proposed using WLAN location systems: on the one hand, the so-called deductive methods take into account the physical properties of signal propagation. These systems require a propagation model, an environment map, and the position of the radio-stations. On the other hand, the so-called inductive methods require a previous training phase where the system learns the received signal strength (RSS) in each location. This phase can be very time consuming. This paper proposes a new stochastic approach which is based on a combination of deductive and inductive methods whereby wireless sensors could determine their positions using WLAN technology inside a floor of a building. Our goal is to reduce the training phase in an indoor environment, but, without an loss of precision. Finally, we compare the measurements taken using our proposed method in a real environment with the measurements taken by other developed systems. Comparisons between the proposed system and other hybrid methods are also provided.
Pigmentos maculares
Canovas, Renata;Cypel, Marcela;Farah, Michel Eid;Belfort Jr, Rubens;
Arquivos Brasileiros de Oftalmologia , 2009, DOI: 10.1590/S0004-27492009000600021
Abstract: lutein and zeaxanthin are yellow pigments located at the macula. because of your location macular pigments decrease and filter the amount of blue light that reach photoreceptors, protect the outer retina from oxidative stress and may improve the vision quality. this is a review regarding incorporation mechanism, function and knowledge update.
Conséquences émotionnelles des erreurs d'arbitrage chez les footballeurs: etude exploratoire
Reynes, Eric;Canovas, Sophie;Ferrand, Claude;Pantaleon, Nathalie;
Psicologia & Sociedade , 2008, DOI: 10.1590/S0102-71822008000100002
Abstract: the aim of this study was to question emotional consequences of referee mistakes, by the mean of interviews of soccer players. one hundred and three soccer players have taken part in the study. participants were 15 to 56 years old. they have fulfilled the french version of the buss-perry aggression questionnaire and taken part to a twenty to thirty minutes semi-directing-interview. the interview was structured around six situations that reflected the crossing of two variables: the kind of referee's decisions (x3) and the repetition of the situation (x2). it was asked to participants what they felt in each of these situations. the main results showed that the referee's mistakes generated feelings of irritation, anger and the perception of injustice. these feelings occurred all the more as referee's mistakes were repetitive. however, false positive mistakes and false negative mistakes were different in their consequences both on feelings and on behaviors. these differences were questioned as regard to the differences in coercion relations between theses actors.
A articula??o entre estratégia e o desenvolvimento de competências gerenciais
Moura, Maria Cristina Canovas de;Bitencourt, Claudia Cristina;
RAE eletr?nica , 2006, DOI: 10.1590/S1676-56482006000100003
Abstract: this study analyzes the link between strategies and the development of managerial competences, verifying how organizational learning takes place. it is a single and exploratory case study, performed at a service company. after mapping the strategies adopted by the company, demands were identified for developing managerial competences appropriate for several periods. the findings highlight how the use of organizational strategies can generate necessities for the development of new managerial competences, considering the attributions and responsibilities which started being taken over by the managers. for the managers the circumstances which most favored their learning process were associated with initiatives of self-development and informal practices of competence articulation, always supported by the organization.
Hemorragia de disco óptico possivelmente secundária a descolamento espontaneo do vítreo posterior
Angelucci, Rodrigo;Canovas, Renata;Mitre, Jorge;Rehder, José Ricardo;
Revista Brasileira de Oftalmologia , 2007, DOI: 10.1590/S0034-72802007000400010
Abstract: to describe the diagnosis and management of a optic disc haemorrhage probably caused by an acute and spontaneous posterior vitreous detachment. a single case-report of an optic disc haemorrhage probably caused by an spontaneous posterior vitreous detachment, in order to discuss the diagnosis, management and prognosis. optic disc haemorrhage regression was observed after 6 hours of evolution without relapsing signals during the subsequent registers. the scanning laser ophthalmoscopy revealed as an advanced alternative and efficient method in the vitreous detachment diagnosis and follow up.
The effects of disk and dust structure on observed polarimetric images of protoplanetary disks
Michiel Min,Hector Canovas,Gijs D. Mulders,Christoph U. Keller
Physics , 2011, DOI: 10.1051/0004-6361/201117333
Abstract: Imaging polarimetry is a powerful tool for imaging faint circumstellar material. For a correct analysis of observations we need to fully understand the effects of dust particle parameters, as well as the effects of the telescope, atmospheric seeing, and assumptions about the data reduction and processing of the observed signal. Here we study the major effects of dust particle structure, size-dependent grain settling, and instrumental properties. We performed radiative transfer modeling using different dust particle models and disk structures. To study the influence of seeing and telescope diffraction we ran the models through an instrument simulator for the ExPo dual-beam imaging polarimeter mounted at the 4.2m William Herschel Telescope (WHT). Particle shape and size have a strong influence on the brightness and detectability of the disks. In the simulated observations, the central resolution element also contains contributions from the inner regions of the protoplanetary disk besides the unpolarized central star. This causes the central resolution element to be polarized, making simple corrections for instrumental polarization difficult. This effect strongly depends on the spatial resolution, so adaptive optics systems are needed for proper polarization calibration. We find that the commonly employed homogeneous sphere model gives results that differ significantly from more realistic models. For a proper analysis of the wealth of data available now or in the near future, one must properly take the effects of particle types and disk structure into account. The observed signal depends strongly on the properties of these more realistic models, thus providing a potentially powerful diagnostic. We conclude that it is important to correctly understand telescope depolarization and calibration effects for a correct interpretation of the degree of polarization.
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