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Search Results: 1 - 10 of 29831 matches for " Luis Pita "
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Canalization and Control in Automata Networks: Body Segmentation in Drosophila melanogaster
Manuel Marques-Pita, Luis M. Rocha
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0055946
Abstract: We present schema redescription as a methodology to characterize canalization in automata networks used to model biochemical regulation and signalling. In our formulation, canalization becomes synonymous with redundancy present in the logic of automata. This results in straightforward measures to quantify canalization in an automaton (micro-level), which is in turn integrated into a highly scalable framework to characterize the collective dynamics of large-scale automata networks (macro-level). This way, our approach provides a method to link micro- to macro-level dynamics – a crux of complexity. Several new results ensue from this methodology: uncovering of dynamical modularity (modules in the dynamics rather than in the structure of networks), identification of minimal conditions and critical nodes to control the convergence to attractors, simulation of dynamical behaviour from incomplete information about initial conditions, and measures of macro-level canalization and robustness to perturbations. We exemplify our methodology with a well-known model of the intra- and inter cellular genetic regulation of body segmentation in Drosophila melanogaster. We use this model to show that our analysis does not contradict any previous findings. But we also obtain new knowledge about its behaviour: a better understanding of the size of its wild-type attractor basin (larger than previously thought), the identification of novel minimal conditions and critical nodes that control wild-type behaviour, and the resilience of these to stochastic interventions. Our methodology is applicable to any complex network that can be modelled using automata, but we focus on biochemical regulation and signalling, towards a better understanding of the (decentralized) control that orchestrates cellular activity – with the ultimate goal of explaining how do cells and tissues ‘compute’.
Schema Redescription in Cellular Automata: Revisiting Emergence in Complex Systems
Manuel Marques-Pita,Luis M. Rocha
Physics , 2011,
Abstract: We present a method to eliminate redundancy in the transition tables of Boolean automata: schema redescription with two symbols. One symbol is used to capture redundancy of individual input variables, and another to capture permutability in sets of input variables: fully characterizing the canalization present in Boolean functions. Two-symbol schemata explain aspects of the behaviour of automata networks that the characterization of their emergent patterns does not capture. We use our method to compare two well-known cellular automata for the density classification task: the human engineered CA GKL, and another obtained via genetic programming (GP). We show that despite having very different collective behaviour, these rules are very similar. Indeed, GKL is a special case of GP. Therefore, we demonstrate that it is more feasible to compare cellular automata via schema redescriptions of their rules, than by looking at their emergent behaviour, leading us to question the tendency in complexity research to pay much more attention to emergent patterns than to local interactions.
Síndrome de la arteria mesentérica superior: presentación de un caso y revisión de la literatura
Delgado Alonso,Ada; Morales Díaz,Ignacio; Pita Armenteros,Luis;
Revista Cubana de Cirug?-a , 2008,
Abstract: a bibliographic review on the superior mesenteric artery syndrome was made. it was reported a case with a symptomatic megaduodenum that also presented abnormalities of the mesenteric artery and congenital anomalies of the duodenojejunal angle and of intestinal malrotation. according to the bibliographic review, it was determined that it is a rare syndrome that is denied by some authors, and that there is no such impingement, but the combination of factors, among which the congenital anomalies prevail.
Influencia del ejercicio físico en la salud del adulto mayor. Consultorio "El Morro", Municipio Sucre
Díaz Pita,Gicela Fca; Vergara López,José Luis;
Revista de Ciencias M??dicas de Pinar del R?-o , 2009,
Abstract: an observation, descriptive, prospective study was conducted in "el morro" medical office, belonging to parroquia petare, sucre municipality. miranda state. venezuela during september 2005 to february 2006, aimed at determining the influence of physical exercise on the health of the elderly. the universe was comprised of 121 aged living in the community and the sample took 66 practicing exercises. data were obtained from the individual medical histories and clinical observation of the elderly using the variables of age, sex, diseases they suffered from and medical treatments they received. data were processed and to carry out the statistical analysis, percentage method was applied obtaining that 54.54% of the elderly practiced physical exercises. the 31.8% got into the group of 60-64, prevailing female sex (57.5%), hypertensive 69.56%, suffering from arthrosis 73.80% and the 71.42% having depressive disorders could be controlled . the 59.52% suffering from arthrosis, 50% of the asthmatic, 43.47% of the hypertensive and the 19.04% of those having depressive disorders diminished the dosage of medications along the day. concluding that physical exercise improves health in the elderly and ensures a healthier longevity.
Síndrome de la arteria mesentérica superior: presentación de un caso y revisión de la literatura Superior mesenteric artery syndrome: a case report and literature review
Ada Delgado Alonso,Ignacio Morales Díaz,Luis Pita Armenteros
Revista Cubana de Cirugía , 2008,
Abstract: Se realizó una revisión bibliográfica sobre el síndrome de la arteria mesentérica superior y se presenta un caso, en el que junto a un megaduodeno sintomático se hallaron anomalías de la arteria mesentérica y anomalías congénitas del ángulo duodeno yeyunal y de rotación intestinal anómala. De la revisión bibliográfica realizada se precisa lo poco frecuente del síndrome, negado por algunos autores, y se afirma que no hay tal pinzamiento sino la combinación de factores, entre los que predominan anomalías congénitas. A bibliographic review on the superior mesenteric artery syndrome was made. It was reported a case with a symptomatic megaduodenum that also presented abnormalities of the mesenteric artery and congenital anomalies of the duodenojejunal angle and of intestinal malrotation. According to the bibliographic review, it was determined that it is a rare syndrome that is denied by some authors, and that there is no such impingement, but the combination of factors, among which the congenital anomalies prevail.
Influencia del ejercicio físico en la salud del adulto mayor. Consultorio "El Morro", Municipio Sucre The influence of physical exercise on the health of the elderly: "El Morro" Medical Office, Sucre municipality, Venezuela
Gicela Fca Díaz Pita,José Luis Vergara López
Revista de Ciencias M??dicas de Pinar del R?-o , 2009,
Abstract: Se realizó un estudio observacional, descriptivo, prospectivo en el consultorio popular "El Morro", perteneciente a la Parroquia Petare, Municipio Sucre del Estado Miranda, República Bolivariana de Venezuela en el periodo de septiembre de 2005 a febrero de 2006, con el objetivo de determinar la influencia del ejercicio físico en la salud del adulto mayor. El universo estuvo integrado por 121 ancianos de la comunidad y la muestra por 66 abuelos que realizaban ejercicios físicos. Los datos se obtuvieron de las historias clínicas individuales y de la observación clínica del anciano utilizando las variables edad, sexo, enfermedades presentes en los adultos mayores y tratamiento que cumplían. Los datos fueron procesados, y se aplicó un análisis estadístico porcentual, obteniendo como resultados que el 54.54% de los abuelos practicaban ejercicios físicos, el 31.8 % se agrupan en el grupo de 60-64 a os, con predominio del sexo femenino en un 57.5 %. El 69.56% de los hipertensos, el 73.80% de los que padecían artrosis y el 71.42% de los que manifestaron trastornos depresivos controlaron estos padecimientos; el 59.52% de pacientes con artrosis, el 50 % de asmáticos, un 43.47 % de los hipertensos y el 19,04%, de los que tienen trastornos depresivos disminuyeron la dosis del medicamento en el día. Se concluye que el ejercicio físico mejora la salud del adulto mayor y le garantiza una longevidad saludable. An observation, descriptive, prospective study was conducted in "El Morro" Medical Office, belonging to Parroquia Petare, Sucre municipality. Miranda State. Venezuela during September 2005 to February 2006, aimed at determining the influence of physical exercise on the health of the elderly. The universe was comprised of 121 aged living in the community and the sample took 66 practicing exercises. Data were obtained from the individual medical histories and clinical observation of the elderly using the variables of age, sex, diseases they suffered from and medical treatments they received. Data were processed and to carry out the statistical analysis, percentage method was applied obtaining that 54.54% of the elderly practiced physical exercises. The 31.8% got into the group of 60-64, prevailing female sex (57.5%), hypertensive 69.56%, suffering from arthrosis 73.80% and the 71.42% having depressive disorders could be controlled . The 59.52% suffering from arthrosis, 50% of the asthmatic, 43.47% of the hypertensive and the 19.04% of those having depressive disorders diminished the dosage of medications along the day. Concluding that physical exercise improves hea
Fístula pancreatogastrocutánea: presentación comentada de un caso
González Salcedo,Joel; Pita Armenteros,Luis; Pérez Jomarrón,Emilio; Morales Díaz,Ignacio;
Revista Cubana de Cirug?-a , 2010,
Abstract: this is the case of a heavy drinker patient aged 39, operated on with urgency due to acute appendicitis; during the operation we found a necrotic-hemorrhagic acute pancreatitis and extensive peritonitis. a programmed peritoneal lavage in wall by plans; afterwards he had fever and it was necessary to drain a subaponeurotic abscess. there was a weight loss and a suppuration by residual orifice in drainage made. a catheter was passed through the orifice for irrigation, secretion cleared and then a fluid of possible intestinal origin flowed. the fistulography showed the existence of a communication between the stomach and the left hypochondrium, obliged us to a reintervention. the patient suffered a hemoperitoneum, and thus a second laparoscopy was performed to carry out a splenectomy in the immediate postoperative period. patient felt well although there was weight loss, tachycardia without fever and computed axial tomography (cat) showed a intracavitary collection in left hypochondrium, draining by transparietal route.
Fecaloma, oblito y oclusión intestinal: informe de un caso, comentarios y una propuesta
Pita Armenteros,Luis; Pérez Jomarrón,Emilio; González Salcedo,Joel; Morales Díaz,Ignacio;
Revista Cubana de Cirug?-a , 2010,
Abstract: this is a case presentation of a patient aged 47 with a huge right humpback appearing at 18 years old. he was operated on 14 years ago from a cystic formation increasing the volume of limbs and the appearance afterwards of a 2,5 cm tumor. ten days before its admission showed a urinary infection, constipation, difficulty to release gases, pain and abdominal distention, visualizing such tumor. at radiography on noted many fecaloma and metallic foreign body. he was operated on verifying the presence of fecalomas, loop distention and foreign body whose tip was visualized and palpated.
Vía lumbar para plastrón apendicular abscedado
Pita Armenteros,Luis; González Salcedo,Joel; Pérez Jomarrón,Emilio; Morales Díaz,Ignacio;
Revista Cubana de Cirug?-a , 2010,
Abstract: this is a case presentation of a woman aged 32 with a torpid course from the onset of her disease. she was operated on due to an abscess appendicular plastron. despite two surgical interventions there were weak signs in right lumbar zone. a lumbotomy was performed and in abscess cavity in retroperitoneum an indwelling catheter was placed for fast dripping clysis during the postoperative period. then, this cavity was roofed off for second-look closure.
Frequency of antibodies anti-Neospora caninum in water buffaloes (Bubalus bubalis) in Bahia State Frequência de anticorpos anti-"Neospora caninum" em búfalos ("Bubalus bubalis") criados no Estado da Bahia
Luis Fernando Pita Gondim,Alexandre Moraes Pinheiro,Maria Angela Ornelas Almeida
Revista Brasileira de Saúde e Produ??o Animal , 2007,
Abstract: Neospora caninum is a protozoan parasite that causes disease in domestic and wild animals. The purpose of the present work was to investigate the frequency of antibodies anti-N. caninum in water buffaloes in Bahia state, Brazil. Blood samples were collected from 117 animals distributed in four farms. The sera were tested using an immunofluorescent antibody technique. Antibodies were detected in 35.9% of the animals using a serum dilution of 1:200 as a cutoff. The titers ranged from 1:200 to 1:800. The high frequency of antibodies anti-N. caninum detected in water buffaloes is suggestive that this animal species is highly exposed to the parasite in Bahia. Further studies are necessary to investigate the role of N. caninum as an abortive agent in buffaloes. Neospora caninum é um parasita protozoário que causa doen a em animais domésticos e silvestres. O objetivo do presente trabalho foi investigar a frequência de anticorpos anti-N. caninum em fazendas de cria o de búfalos na Bahia, Brasil. Amostras de sangue foram colhidas de 117 animais distribuídos em quatro fazendas. Os soros foram testados utilizando-se a técnica de imunofluorescência indireta. Anticorpos foram detectados em 35,9% dos animais, empregando-se a dilui o de 1:200 como ponto de corte. Os títulos variaram de 1:200 à 1:800. A elevada frequência de anticorpos anti-N. caninum detectada em búfalos é sugestivo de que essa espécie animal é altamente exposta ao parasita na Bahia. Outros estudos s o necessários para investigar o papel de N. caninum como agente abortivo em búfalos.
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