Fractura femoral en paciente portador de un clavo intramedular

Los autores presentan el caso de un paciente con una fractura femoral tratado con un clavo intramedular cerrojado que sufrió una nueva fractura antes de extraer el material de osteosíntesis.The authors present a patient with a femoral fracture treated by interlocking nail who underwent a new fracture of the femoral shaft before removal of the nail

Logarithmic Corrections for Spin Glasses, Percolation and Lee-Yang Singularities in Six Dimensions

We study analytically the logarithmic corrections to the critical exponents of the critical behavior of correlation length, susceptibility and specific heat for the temperature and the finite-size scaling behavior, for a generic $\phi^3$ theory at its upper critical dimension (six). We have also computed the leading correction to scaling as a function of the lattice size. We distinguish the obtained formulas to the following special cases: percolation, Lee-Yang (LY) singularities and $m$-component spin glasses. We have compared our results for the Ising spin glass case with numerical simulations finding a very good agreement. Finally, and using the results obtained for the Lee-Yang singularities in six dimensions, we have computed the logarithmic corrections to the singular part of the free energy for lattice animals in eight dimensions.Comment: 18 pages. We have extended the computation to lattice animals in eight dimensions. To be published in Journal of Physics

Artroplastia total de tobillo

Presentamos un estudio retrospectivo de siete pacientes tratados con artroplastia total de tobillo en el período 1978-1988, realizando una revisión bibliográfica del tema. La serie la componen cinco hombres y dos mujeres con edades comprendidas entre 41 y 72 años. Cinco pacientes estaban afectos de artrosis postraumática, uno de artropatía gotosa y otro de espondilitis anquilopoyética. Los modelos protésicos utilizados fueron Smith en cuatro ocasiones e I.C.L.H. en tres. El seguimiento medio ha sido de once años, siendo evaluados según un sistema de puntuación creado por Mc Guire. En tres pacientes se ha obtenido un resultado excelente, en dos bueno y los dos restantes fueron reintervenidos realizándose una artrodesis.We have reported a retrospective study of seven patients with total ankle arthroplasty perfomed between 1978-1988. We have reviewed series published in the literature. There were five men and two women, the age range of this group was 41-72 years. Five of them suffered from posttraumatic arthrosis, one ankylosing spondylitis and the last had gouty arthritis. Four patients recieved the Smith total ankle and three the ICLH total ankle. The mean follow-up period was eleven years. Patients were evaluated using a scoring system (Mc Guire et al). Three patients had an excellent result, the result from two of them were good and the other two patients required revision and arthrodesis

Caracterização de substâncias húmicas extraídas de solo tratado com carvão vegetal (biochar).

As Terras Pretas de Índio (TPI) são solos antropogênicos encontrados na Amazônia, que têm alto teor de carbono (C) orgânico, alta fertilidade e alta capacidade de recuperação. Os TPI possuem estas características devido ao caráter pirogênico do C que neles se encontra, e que se manifestam na alta proporção de estruturas aromáticas policondensadas com grupos funcionais carboxílicos originadas das alterações naturais de biomassa carbonizada adicionada ao solo pelas populações indígenas pré-colombianas

Comparação entre extratores químicos de fósforo disponível.

Foram comparados três extratos quimicos de fósforo dispon¡vel em um Latossolo Vermelho-Escuro submetido a quatro tratamentos de adubação fosfatada (0, 150 e 450 mg de P/dm3 de solo). Os extratores qu¡micos testados foram: Mehlich 1, Mehlich 3 e resina trocadora de ânions. Entre esses, sobressaiu-se a resina, com maiores coeficientes de correlação entre a matéria seca da parte aérea de plantas de milho e o fósforo acumulado no tecido vegetal e com o fósforo extra¡do do solo. A resina também recuperou maior quantidade de fósforo do solo, além de ter apresentado correlação significativa com os outros extratores.bitstream/item/35785/1/Bol18.pd

Human cachexia induces changes in mitochondria, autophagy and apoptosis in the skeletal muscle

Cachexia is a wasting syndrome characterized by the continuous loss of skeletal muscle mass due to imbalance between protein synthesis and degradation, which is related with poor prognosis and compromised quality of life. Dysfunctional mitochondria are associated with lower muscle strength and muscle atrophy in cancer patients, yet poorly described in human cachexia. We herein investigated mitochondrial morphology, autophagy and apoptosis in the skeletal muscle of patients with gastrointestinal cancer-associated cachexia (CC), as compared with a weight-stable cancer group (WSC). CC showed prominent weight loss and increased circulating levels of serum C-reactive protein, lower body mass index and decreased circulating hemoglobin, when compared to WSC. Electron microscopy analysis revealed an increase in intermyofibrillar mitochondrial area in CC, as compared to WSC. Relative gene expression of Fission 1, a protein related to mitochondrial fission, was increased in CC, as compared to WSC. LC3 II, autophagy-related (ATG) 5 and 7 essential proteins for autophagosome formation, presented higher content in the cachectic group. Protein levels of phosphorylated p53 (Ser46), activated caspase 8 (Asp384) and 9 (Asp315) were also increased in the skeletal muscle of CC. Overall, our results demonstrate that human cancer-associated cachexia leads to exacerbated muscle-stress response that may culminate in muscle loss, which is in part due to disruption of mitochondrial morphology, dysfunctional autophagy and increased apoptosis. To the best of our knowledge, this is the first report showing quantitative morphological alterations in skeletal muscle mitochondria in cachectic patients

Construct validation of reading and text production competences in the beginning of the educational reform in the Mexican Elementary School

Este estudio exploratorio fue desarrollado con el propósito de proporcionar evidencias empíricas a la estructuración de competencias lingüísticas por aprendizajes esperados, en el sexto grado de primaria, en los albores de la generalización de la reforma en la primaria mexicana. Para tal fin fue elaborado y sometido a validación de constructo un instrumento de evaluación del español en sexto grado en dos porciones: 1. Competencias de comprensión lectora y 2. Competencias de producción de textos propios, el cual, previa validación por jueces, fue aplicado a 87 alumnos de sexto grado de escuelas públicas del Municipio de Cuautla, Estado de Morelos. Pese a algunas inconsistencias en la especificación de aprendizajes esperados en el Programa de la SEP y de algunas actividades en el libro de texto, los modelos estructurales de análisis confirmatorio respaldaron empíricamente la estructuración de competencias comunicativas y los aprendizajes esperados inherentes a dichas competencias, tanto en comprensión lectora, como en producción de textos.This study was developed with the aim of providing empirical evidence for the structuring of language skills by learning expected in the sixth grade, in the wake of widespread educational reform of the elementary schools in Mexico. For this purpose it was built and subjected to construct validation an assessment instrument in sixth grade in two contests: 1. Reading comprehension and 2. Production of own texts, which, after validation by judges, was administered to 87 sixth grade students of public schools in the municipality of Cuautla, Morelos. In spite of some inconsistencies in the specification of learning expected in the SEP’ program and some activities in the textbook, the structural models with confirmatory analysis, supported the structuring of learning communication competences and the expected learning these skills inherent, in reading comprehension and production of texts

On the relevance of percolation theory to the vulcanization transition

The relationship between vulcanization and percolation is explored from the perspective of renormalized local field theory. We show rigorously that the vulcanization and percolation correlation functions are governed by the same Gell--Mann-Low renormalization group equation. Hence, all scaling aspects of the vulcanization transition are reigned by the critical exponents of the percolation universality class.Comment: 9 pages, 2 figure

Identity of the universal repulsive-core singularity with Yang-Lee edge criticality

Lattice and continuum fluid models with repulsive-core interactions typically display a dominant, critical-type singularity on the real, negative activity axis. Lai and Fisher recently suggested, mainly on numerical grounds, that this repulsive-core singularity is universal and in the same class as the Yang-Lee edge singularities, which arise above criticality at complex activities with positive real part. A general analytic demonstration of this identification is presented here using a field-theory approach with separate representation of the repulsive and attractive parts of the pair interactions.Comment: 6 pages, 3 figure

Resistência à penetração de um Latossolo sob integração lavoura-pecuária-floresta.

A integração lavoura-pecuária-floresta (ILPF) é um sistema otimizado de uso do solo. Entretanto, ainda que associada a práticas conservacionistas, essa intensificação no uso do solo, pode trazer consigo algumas consequências negativas, entre elas a compactação, que pode ser estimada pela resistência do solo à penetração (RP). A limitação potencial do crescimento de raízes e da parte aérea das plantas e, por consequência, a queda na produtividade, estão entre os principais fatores afetados pelo aumento da RP. Este trabalho objetivou avaliar a RP em um Latossolo Vermelho Amarelo sob ILPF em Nova Canaã do Norte, MT