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Search Results: 1 - 10 of 410784 matches for " Claudia Pozo M "
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Detección de Salmonella enteritidis en muestras de productos avícolas de consumo humano en la Región Metropolitana Detection of Salmonella enteritidis in samples of poultry products for human consumption in the Chilean Metropolitan Area
Marcela Alexandre S,Claudia Pozo M,Viviana González G,María Cristina Martínez H
Revista médica de Chile , 2000,
Abstract: Background: Salmonella enteritidis (SE) is a frequent cause of diarrhea, and is transmitted mainly by SE contaminated eggs or poultry meat. The frequency of SE contaminated eggs or chicken meat and the risk for acquiring this pathogen is unknown in Chile. Aim: To measure SE contamination in eggs poultry meat and entrails offered in retail markets in the Metropolitan Area during two consecutive years (1998-1999). Material and methods: Samples were placed in sterile bags and transported to the laboratory before 4 hours at 4°C. Microbiologic detection was done using a standard procedure and an immunodetection assay. Results: SE was found in one of 1081 egg samples (0.09%). The contaminated sample was offered in a supermarket under their own commercial name. Six percent of 1154 poultry meat samples were contaminated by SE and 2.3% by other Salmonella serotypes. Entrails had even higher rates with 10.2% of 370 samples harboring SE and 2,7% other serotypes. Total Salmonella sp. isolates and SE isolates declined during 1999. Nine SE phagotypes were identified, predominating types 4 and 7. Conclusions: Eggs and other avian products are contaminated by different SE phagotypes and other Salmonella serotypes, implicating a risk for the consumers (Rev Méd Chile 2000; 128: 1075-83).
Detección de Salmonella enteritidis en muestras de productos avícolas de consumo humano en la Región Metropolitana
Alexandre S,Marcela; Pozo M,Claudia; González G,Viviana; Martínez H,María Cristina; Prat M,Soledad; Fernández R,Alda; Fica C,Alberto; Fernández O,Jorge; Heitmann G,Ingrid;
Revista médica de Chile , 2000, DOI: 10.4067/S0034-98872000001000001
Abstract: background: salmonella enteritidis (se) is a frequent cause of diarrhea, and is transmitted mainly by se contaminated eggs or poultry meat. the frequency of se contaminated eggs or chicken meat and the risk for acquiring this pathogen is unknown in chile. aim: to measure se contamination in eggs poultry meat and entrails offered in retail markets in the metropolitan area during two consecutive years (1998-1999). material and methods: samples were placed in sterile bags and transported to the laboratory before 4 hours at 4°c. microbiologic detection was done using a standard procedure and an immunodetection assay. results: se was found in one of 1081 egg samples (0.09%). the contaminated sample was offered in a supermarket under their own commercial name. six percent of 1154 poultry meat samples were contaminated by se and 2.3% by other salmonella serotypes. entrails had even higher rates with 10.2% of 370 samples harboring se and 2,7% other serotypes. total salmonella sp. isolates and se isolates declined during 1999. nine se phagotypes were identified, predominating types 4 and 7. conclusions: eggs and other avian products are contaminated by different se phagotypes and other salmonella serotypes, implicating a risk for the consumers (rev méd chile 2000; 128: 1075-83).
Positivity and conservation of superenergy tensors
Jose M. Pozo,Josep M. Parra
Physics , 2001, DOI: 10.1088/0264-9381/19/5/309
Abstract: Two essential properties of energy-momentum tensors T_{\mu\nu} are their positivity and conservation. This is mathematically formalized by, respectively, an energy condition, as the dominant energy condition, and the vanishing of their divergence \nabla^\mu T_{\mu\nu}=0. The classical Bel and Bel-Robinson superenergy tensors, generated from the Riemann and Weyl tensors, respectively, are rank-4 tensors. But they share these two properties with energy momentum tensors: the Dominant Property (DP) and the divergence-free property in the absence of sources (vacuum). Senovilla defined a universal algebraic construction which generates a basic superenergy tensor T{A} from any arbitrary tensor A. In this construction the seed tensor A is structured as an r-fold multivector, which can always be done. The most important feature of the basic superenergy tensors is that they satisfy automatically the DP, independently of the generating tensor A. In a previous paper we presented a more compact definition of T{A} using the r-fold Clifford algebra. This form for the superenergy tensors allowed to obtain an easy proof of the DP valid for any dimension. In this paper we include this proof. We explain which new elements appear when we consider the tensor T{A} generated by a non-degree-defined r-fold multivector A and how orthogonal Lorentz transformations and bilinear observables of spinor fields are included as particular cases of superenergy tensors. We find some sufficient conditions for the seed tensor A, which guarantee that the generated tensor T{A} is divergence-free. These sufficient conditions are satisfied by some physical fields, which are presented as examples.
Clifford Algebra Approach to Superenergy Tensors
Jose M. Pozo,Josep M. Parra
Physics , 1999,
Abstract: Senovilla has recently defined an algebraic construction of a superenergy tensor T{A} from any arbitrary tensor A, by structuring it as an r-fold form. This superenergy tensor satisfies automatically the dominant superenergy property. We present a more compact definition using the r-direct product Clifford algebra r-Cl(p,q). This form for the superenergy tensors allows to obtain an easy proof of the dominant superenergy property valid for any dimension.
Non-Linear Semi-Quantum Hamiltonians and Its Associated Lie Algebras  [PDF]
Claudia M. Sarris, Angelo Plastino
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.520306
Abstract: We show that the non-linear semi-quantum Hamiltonians which may be expressed as\"\"(where\"\"is the set of generators of some Lie algebra and are the classical conjugated canonical variables) always close a partial semi Lie algebra under commutation and\"\", because of this, it is always possible to integrate the mean values of the quantum degrees of freedom of the semi-quantum non-linear system in the fashion:\"\"(where\"\"is the Maximum Entropy Principle density operator) and, so, these kind of Hamiltonians always have associated dynamic invariants which are expressed in terms of the quantum degrees of freedom’s mean values. Those invariants are useful to characterize the kind of dynamics (regular or irregular) the system displays given that they can be fixed by means of the initial conditions imposed on the semi-quantum non-linear system.
Paleosuelos de sepiolita en el neógeno de la cuenca de Madrid
Leguey, S.,Pozo, M.,Medina, J. A.
Estudios Geologicos , 1989, DOI: 10.3989/egeol.89455-6500
Abstract: The mineralogical composition from sepiolite bearing clays allows us to stablish remarkable variations among this mineral: smectite, illite, detrital grains (quartz and feldspar) and carbonates (calcite and dolomite) according to bed thickness. Sepiolite formation is related to silicification processes which control textural features, crystallinity degree (sharpness) and sepiolite aggregate size as a function of the SiO2/MgO ratio. Silicification is favoured by CaCO3 and an oscillating water table with dissolution-precipitation mechanisms which give rise to hydromorphic paleosoils in the shallower zones. In these paleosoils sepiolite develops mainly on saponite bearing green clays, with glomerulae and laminated textures. In deeper zones, sepiolite appears with massive textures (grid-type) on clays, cementing when there is a high content of terrigenous minerals, both are diagenetic in origin. El análisis de la composición mineral de materiales arcillosos con sepiolita, pone de manifiesto variaciones significativas en el contenido de este mineral, con respecto a esmectitas e illitas, minerales terrígenos (cuarzo y feldespato) y carbonatos (calcita y dolomita) según la potencia de los materiales. La formación de sepiolita se relaciona con un proceso de silicificación, que controla el tipo de textura, el grado de cristalinidad y el tama o de los agregados de sepiolita en función de la relación SiO22/MgO. La silicificación está favorecida por la presencia de CO3Ca, el carácter alternante de la tabla de agua, con mecanismos de disolución-precipitación, da lugar en las zonas más superficiales a suelos hidromórficos. En estos suelos la sepiolita se forma principalmente sobre lutitas verdosas ricas en saponita, con desarrollo de texturas glomerulares y laminares. En zonas más profundas se desarrollan texturas masivas de sepiolita, de tipo reticular sobre materiales arcillosos, y en forma de cémentos cuando predominan minerales terrígenos, ambos de carácter diagenético.
A Heuristic Process for Local Inconsistency Diagnosis in Firewall Rule Sets
Sergio Pozo,Rafael Ceballos,Rafael M. Gasca
Journal of Networks , 2009, DOI: 10.4304/jnw.4.8.698-710
Abstract: Writing and managing firewall ACLs are hard and error-prone tasks for a wide range of reasons. During these tasks, inconsistent rules can be introduced. An inconsistent firewall ACL implies in general a design error, and indicates that the firewall is accepting traffic that should be denied or vice versa. However, the administrator is who ultimately decides if an inconsistent rule is a fault or not. Although many algorithms to diagnose inconsistencies in firewall ACLs have been proposed, they have different drawbacks regarding many aspects of the consistency management problem, which can prevent their use in a wide range of real-life situations. The most important one is that they give complete and minimal results, but their algorithmic complexity is too high, making the problem intractable for even reasonably-sized ACLs. In this paper we present an analysis of the consistency diagnosis problem in firewall ACLs. Based on this analysis, we propose to split the process in several parts that can be solved sequentially: inconsistency detection and isolation, inconsistent rules identification, and inconsistency characterization. Our algorithms are the first which can solve the detection, isolation, and identification problems in quadratic time complexity, giving complete but not necessarily minimal results. A theoretical complexity analysis as well as experimental results with real ACLs is given.
Determinación de la Dimensión Vertical Oclusal en desdentados totales: comparación de métodos convencionales con el craneómetro de Knebelman Determination of Oclusal Vertical Dimension in edentulous: comparison of conventional methods with Knebelman craneometer
R Quiroga Del Pozo,R Riquelme Belmar,M Sierra Fuentes,J Del Pozo Bassi
Revista Clínica de Periodoncia, Implantología y Rehabilitación Oral , 2012,
Abstract: Objetivo: Se realizó una investigación cuyo propósito fue comparar la DVO determinada mediante métodos convencionales y la determinada por el craneómetro de Knebelman en el mismo paciente. Método: Se consideró como metodología convencional la DVO medida estando el paciente con sus prótesis en máxima intercuspidación. El estudio se realizo en una muestra de 45 individuos desdentados totales y parciales sin referencia oclusiva, rehabilitados con prótesis removible en la en la Clínica Integral del Adulto I y II. Los resultados fueron analizados empleando el test t pareado expresado en mm. de la DVO determinada con cada metodología. Resultado: Se encontraron diferencias significativas entre ambas mediciones y se empleó el test Chi-Cuadrado para analizar la influencia en la magnitud de la DVO observada cuando se emplea una o más referencias en su determinación, donde no se encontraron diferencias significativas. El rango de diferencias entre ambas metodologías de determinación en promedio fue de 2.93 mm considerado no relevante desde el punto de vista clínico. Conclusión: En este contexto el craneómetro de Knebelman puede ser un valioso instrumento que permita simplificar la determinación de la DVO en pacientes desdentados. Objective: The purpose of this investigation was to compare the OVD obtained with the conventional methods and the one that is obtained with the Knebelman craniometric system in the same patient. Methods: The OVD considered as "conventional" was the one obtained with the patient using his/her dental prosthesis in maximum intercuspidation. This study was made using a sample of 45 edentulous and partially edentulous subjects, all treated with full removable denture and RPD in "Odontologia Integral del Adulto I & II". The results were analyzed using pair comparison system for the different OVD obtained with both methods (all expressed in millimeters). Results: Significant differences were found between both methods. The Chi-Square test to analyze de influence in the OVD when one or more references are used, didn′t show any significant differences. The average discrepancy between the two methods was 2.93 mm, which is considered as not clinically significant. Conclusion: In this context the Knebelman craneometer can be considered as an important instrument to simplify the determination of the OVD in edentulous patients.
Adaptación del Sistema Espiga Mu ón en Relación a la Preparación del Conducto Fit of the Cast Post and Core System with Different Canal Preparations
J Quiroga Del Pozo,P Ruz Espinoza,M Sierra Fuentes,J Del Pozo Bassi
Revista Clínica de Periodoncia, Implantología y Rehabilitación Oral , 2010,
Abstract: Se realizó un estudio in vitro que tuvo por objetivo medir el grado de adaptación del sistema espiga mu ón, debido a que es uno de los factores fundamentales para lograr un buen anclaje de estos artificios, medido a nivel del núcleo de éste con respecto a los planos radiculares y de la espiga a las paredes del conducto, cuando es conformado con fresas Peeso y cuando es conformado usando fresas Peeso terminando con fresas del sistema Mooser. Seleccionamos 40 dientes que se dividieron al azar en dos grupos de 20, denominados P y M, respectivamente. Se confeccionó en cada muestra, previamente tratado su conducto mediante método indirecto, un perno mu ón colado que fue probado en la preparación donde se midió el ajuste del mu ón propiamente tal, después de logrado el asentamiento adecuado mediante desgastes en las interferencias de la espiga fueron cementados, posteriormente se realizaron dos cortes transversales a todo el espesor de la raíz a diferentes alturas, donde se midió la interfase entre la espiga y las paredes del conducto (adaptación). Los resultados fueron analizados utilizando los test de Mann-Whitney, Tukey y test T pareado, con software Systat versión 11, encontrándose que la mejor adaptación se observa en las muestras del grupo M en los dos sitios observados, comparadas con las del grupo P Estas diferencias son estadísticamente significativas. We carried out a research aumed to determine the adaptation of the system called cast post and core, because it's one of the main factors to achieve a good adaptation of these devices measured from the core of this device to radicular plan, and from the post to the canal protesic's surface, when this one was prepared with Peeso's burs, and when was also prepared starting with Peeso's burs but finishing with Mooser system's burs. For that objective, we selected 40 teeth that were divided randomly into two groups of 20, called P and M respectively. A cast post and core was made in each sample through indirect method, previously treated the protesic canal. The cast post and core was tested in the preparation where the fit of the core was measured. Once achieved the proper settlement through the wearing out of the post's interferences and once the cast post and core was cemented, we made two cross cuttings to the thickness of the root at two differents levels, where the interface between the post and canal protesic's surface was measured (adaptation). The results were analyzed using the Mann-Whithny test, Tukey and paired T test, with Systast software version 11, having found that the best adaptation was o
Delimitation of the Coastal Transition Zone in the Gulf of Guayaquil, Ecuador
W. Pozo,M. M. Jordán,T. Sanfeliu
Journal of Geography and Geology , 2012, DOI: 10.5539/jgg.v4n3p81
Abstract: The article presents a methodology for the delimitation of the coastal transition zone (CTZ) and the identification of zones with distinct soil properties in the Gulf of Guayaquil (GG), Ecuador. The Gulf was chosen as study area for its urban, economic and ecological potential, more in particular for its rich marine and agricultural resources, and biodiversity. Soil physical and chemical methods, such as soil salinity indices, physical and chemical parameters, coupled with multivariate analysis enabled the delimitation of the CTZ and the grouping of the studied soil transets in three clusters with distinct properties, located in the GG from the limit of the mangrove swamp. Whereas the average conductance in the swamp area is around 27.17 mS cm-1, inland to the isoline called the coastal transit zone soil salinity on average is 4 mS cm-1. The coastal transition zone has an average width of 4.2 km, which can be characterized by three clusters. Clusters 1 and 2 show similarities in their physical and chemical soil parameters, clearly different from the soil properties of cluster 3. The characteristics of each cluster is related to its location within the study area.
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