Variables asociadas al deterioro cognitivo en pacientes de cáncer de colon

Objective: Identify predictors of lower cognitive performance in colon cancer patients treated with surgery before undergoing chemotherapy. Methods: In a sample of 89 colon cancer patients, we evaluated the relation between their cognitive performance in three cognitive domains (executive function, verbal memory and psychomotor skill) and the following variables: Age, sex, years of study, stage, medical prognosis, comorbidity, haemoglobin, anxiety, depression, fatigue, quality of life, physical and psychosocial problems. Results: They are a predominantly male sample (61.8%), over 65 years (mean 66.9) without neuropsychological illness history (89.9%). But, data show correlational relationships between some cognitive performance test and certain variables assessed. There are remarkable negative correlations with age, respiratory problems and social perception of the quality of life, with lower cognitive performance on tests of verbal memory, executive function and psychomotor ability (p <0.05). Also, patients with stage III colon cancer performed worse than those with stage II disease and those with less than five years of study differ from most studies in the three cognitive domains (p < 0.05). Conclusions: The profile of patients with colon cancer at high risk of cognitive deficit is: Old age, with stage III disease, little formal education, breathing problems and a good perception of their quality of social life.Objetivo: Identificar las variables predictoras de menor rendimiento cognitivo en pacientes de cáncer de colon tratados con cirugía que esperan recibir quimioterapia. Método: En una muestra de 89 pacientes de cáncer de colon se valoró la relación entre su rendimiento en tres dominios cognitivos (función ejecutiva, memoria verbal y habilidad psicomotora) y las siguientes variables: edad, sexo, años de escolaridad, estadio, pronóstico médico, comorbilidad, hemoglobina, ansiedad, depresión, astenia, calidad de vida, problemas físicos y psicosociales. Resultados: En la muestra predominan los varones (61,8%), mayores de 65 años (media 66,9), sin antecedentes neuropsicológicos (89,9%). Los datos correlacionales ponen de manifiesto relaciones selectivas entre alguna prueba de rendimiento cognitivo y ciertas variables evaluadas. Se destaca la existencia de correlaciones negativas de la edad, los problemas respiratorios y la percepción social de la calidad de vida con el rendimiento cognitivo en pruebas de memoria verbal, función ejecutiva y habilidad psicomotora (p < 0,05). Así mismo, los pacientes en estadio III del cáncer de colon rinden peor que aquellos con la enfermedad en estadio II y quienes tienen menos de cinco años de estudios difieren de los de más estudios en los tres dominios cognitivos (p < 0,05) Conclusiones: el perfil detectado de los enfermos de cáncer de colon de alto riesgo de déficit cognitivo es: paciente mayor, con enfermedad en estadio III, de escasa formación escolar, que tiene problemas respiratorios y una buena percepción de su calidad de vida social

Proposta de organização e visualização de grande quantidade de imagens orbitais através de web services.

The organization of satellite imagery seeks to facilitate the presentation and manipulation of spatial information in projects of Land Management's Strategic area from Embrapa Satellite Monitoring, enabling integration between mapped data and interoperability of image data and mapped regions. As a way to standardize this organization, we followed the recommendations of national and international bodies that deal with the standardization of geographic metadata, specifically satellite images. To view this integration, a webmapping interface was created. A webmapping must be prepared to meet the needs of relationship between user and product. In this paper we propose a standardized structure for storage and maintenance of images obtained by satellite sensors aiming its availability on the web through web map services, examples of interoperability. The non-interoperability prevents sharing of information and computing resources. The visualization of web map services takes place through a webmapping that benefits from the organization structure of satellite images proposed in this paper. The hierarchical organization proposed research assistance of satellite images. As they are entered into the database, now new images will be organized in a logical structure, without affecting the search for listings older images. The webmapping allows a direct link between the metadata and geospatial data visualization. Combining web services based on Geographic Information Systems (GIS) in conjunction with the Flex technology allows the creation of Rich Internet Applications (RIA) giving the user more possibilities of interaction via the Web

On Fields with Finite Information Density

The existence of a natural ultraviolet cutoff at the Planck scale is widely expected. In a previous Letter, it has been proposed to model this cutoff as an information density bound by utilizing suitably generalized methods from the mathematical theory of communication. Here, we prove the mathematical conjectures that were made in this Letter.Comment: 31 pages, to appear in Phys.Rev.

Ultrarelativistic Bondi--Hoyle Accretion I: Axisymmetry

An ultrarelativistic relativistic study of axisymmetric Bondi--Hoyle accretion onto a moving Kerr black hole is presented. The equations of general relativistic hydrodynamics are solved using high resolution shock capturing methods. In this treatment we consider the ultrarelativistic limit wherein one may neglect the baryon rest mass density. This approximation is valid in the regime where the internal energy of the system dominates over the rest mass energy contribution from the baryons. The parameters of interest in this study are the adiabatic constant $\Gamma$, and the asymptotic speed of the fluid, $v_\infty$. We perform our simulations in three different regimes, subsonic, marginally supersonic, and supersonic, but the primary focus of this study is the parameter regime in which the flow is supersonic, that is when $v_\infty \ge c_{s}^{\infty}$. As expected from previous studies the supersonic regimes reveal interesting dynamics, but even more interesting is the presence of a bow shock in marginally supersonic systems. A range of parameter values were investigated to attempt to capture possible deviations from steady state solutions, none were found. To show the steady state behaviour of each of the flows studied we calculate the energy accretion rates on the Schwarzschild radius. Additionally, we also find that the accretion flows are dependent on the location of the computational boundary, that if the computational boundary is located too close to the black hole the calculated flow profiles are marred with numerical artifacts. This is a problem not found in previous relativistic models for ultrarelativistic hydrodynamic systems.Comment: 16 pages, 15 figures, Typos correcte

Caracterização preliminar de linhagens de arroz com tipos de grãos especiais.

No Brasil os tipos de grãos de arroz mais consumidos são o arroz branco polido, o parboilizado e o integral, apesar da existência de tipos de grãos bem diferentes, os arrozes especiais. Estes tipos de arroz possuem valor comercial elevado, mas, sua produção é dificultada pelo baixo consumo interno

Caracterização preliminar de linhagens de arroz com tipos de grãos especiais.

Este trabalho teve como objetivo avaliar 36 linhagens de origens diversas e pertencentes a sete tipos distintos de grãos especiais visando caracterizá-las quanto ao número de dias até o florescimento, altura de plantas e produtividade, para de identificar as mais promissoras utilizá-las como genitores no programa de melhoramento da Embrapa

Produção e qualidade de sementes de Brachiaria humidicola cv. Llanero em razão da adubação nitrogenada e potássica.

A qualidade e vitalidade das sementes dependem, em parte, do vigor de seus ascendentes, motivo pelo qual as terras cultivadas com a finalidade de produção de sementes devem possuir boa fertilidade, além de receberem adubações equilibradas. O objetivo do trabalho foi de avaliar os efeitos da combinação de doses de N e K na adubação de cobertura da Brachiaria humidicola cv. Llanero sobre a produtividade e qualidade fisiológica de sementes. Este trabalho foi conduzido entre novembro de 2008 a abril de 2009, no sítio Santa Angélica, na cidade de Santo Anastácio, Oeste do estado de São Paulo. O material estudado foi Brachiaria humidicola cv. Llanero. A semeadura foi realizada em linha com espaçamento de 1 m, após um processo de preparo de solo convencional. O delineamento experimental foi em blocos inteiramente casualizado, com quatro repetições em esquema fatorial 4x4, considerando quatro doses de nitrogênio (0, 50, 100, 200 kg ha-1) e quatro doses de potássio (0, 50, 100, 200 kg ha-1). A adubação nitrogenada e potássica influenciou a qualidade fisiológica das sementes de Brachiaria humidicola cv. Llanero, onde houve o aumento da porcentagem de pureza física das sementes e produtividade de sementes por hectare, em função do aumento das doses de nitrogênio e potássio. A taxa de germinação aumentou em função do incremento das doses de nitrogênio, porém o mesmo não ocorreu com a suplementação de potássio, que não teve interferência significativa sobre este parâmetro

Deformed Density Matrix and Quantum Entropy of the Black Hole

In the present work the approach - density matrix deformation - earlier developed by the author to study a quantum theory of the Early Universe (Planck's scales) is applied to study a quantum theory of black holes. On this basis the author investigates the information paradox problem, entropy of the black hole remainders after evaporation, and consistency with the holographic principle. The possibility for application of the proposed approach to the calculation of quantum entropy of a black hole is considered.Comment: 17 pages, Latex, new referenc