Padrões Eletroforéticos de Marcadores Proteicos de Lobos-guarás (chrysocyon brachyurus).

bitstream/item/54269/1/98-621-1BP27.pd

Phase transitions and crossovers in reaction-diffusion models with catalyst deactivation

The activity of catalytic materials is reduced during operation by several mechanisms, one of them being poisoning of catalytic sites by chemisorbed impurities or products. Here we study the effects of poisoning in two reaction-diffusion models in one-dimensional lattices with randomly distributed catalytic sites. Unimolecular and bimolecular single-species reactions are considered, without reactant input during the operation. The models show transitions between a phase with continuous decay of reactant concentration and a phase with asymptotic non-zero reactant concentration and complete poisoning of the catalyst. The transition boundary depends on the initial reactant and catalyst concentrations and on the poisoning probability. The critical system behaves as in the two-species annihilation reaction, with reactant concentration decaying as t^{-1/4} and the catalytic sites playing the role of the second species. In the unimolecular reaction, a significant crossover to the asymptotic scaling is observed even when one of those parameters is 10% far from criticality. Consequently, an effective power-law decay of concentration may persist up to long times and lead to an apparent change in the reaction kinetics. In the bimolecular single-species reaction, the critical scaling is followed by a two-dimensional rapid decay, thus two crossovers are found.Comment: 8 pages, 7 figure

Uncertainty-Aware Organ Classification for Surgical Data Science Applications in Laparoscopy

Objective: Surgical data science is evolving into a research field that aims to observe everything occurring within and around the treatment process to provide situation-aware data-driven assistance. In the context of endoscopic video analysis, the accurate classification of organs in the field of view of the camera proffers a technical challenge. Herein, we propose a new approach to anatomical structure classification and image tagging that features an intrinsic measure of confidence to estimate its own performance with high reliability and which can be applied to both RGB and multispectral imaging (MI) data. Methods: Organ recognition is performed using a superpixel classification strategy based on textural and reflectance information. Classification confidence is estimated by analyzing the dispersion of class probabilities. Assessment of the proposed technology is performed through a comprehensive in vivo study with seven pigs. Results: When applied to image tagging, mean accuracy in our experiments increased from 65% (RGB) and 80% (MI) to 90% (RGB) and 96% (MI) with the confidence measure. Conclusion: Results showed that the confidence measure had a significant influence on the classification accuracy, and MI data are better suited for anatomical structure labeling than RGB data. Significance: This work significantly enhances the state of art in automatic labeling of endoscopic videos by introducing the use of the confidence metric, and by being the first study to use MI data for in vivo laparoscopic tissue classification. The data of our experiments will be released as the first in vivo MI dataset upon publication of this paper.Comment: 7 pages, 6 images, 2 table

“A Gale of Hope for Latin America” : The Concept of Esperanza/Esperança as a Cultural Keyword

The terms esperanza (Spanish) and esperança (Portuguese) (‘hope’) are frequently used in the political and social discourse of Latin America. In this vast region, plagued by recurrent political and economic crisis and other social challenges, the feeling of hope, but also its counterpart, lack of hope/hopelessness, is present in mass media, social media, the discourse of politicians and other public figures, as well as in the urban landscape, and represents the spirit of people who are not ready to give up on a brighter future. We propose that the terms esperanza/esperança are cultural keywords in Latin America. For our analysis, we have chosen two countries, Argentina and Brazil, to carry out a corpus study. We focus mainly on Twitter data, but we also include other written media to identify the most salient semantic and pragmatic features of these words and their importance in these Latin American countries. As part of the analysis, we look into possible differences between Spanish and Portuguese—that is, differences in use in the selected countries

Editorial: Novel Actuators, Sensors and Control Systems for Endoscopic Robots

Editorial on the Research Topic. Novel Actuators, Sensors and Control Systems for Endoscopic Robots

Floração e frutificação de bocaiúva (Acrocomia aculeata) e do carandá (Copernicia alba) no Pantanal.

A bocaiúva apresenta frutos verdes o ano todo com frutos maduros de setembro a dezembro. O período da floração varia entre anos. A produção média de inflorescências e cachos varia entre anos. O carandá floresce de julho a dezembro e frutifica de janeiro a maio. Os cachos verdes permanecem na palmeira de dezembro a maio.bitstream/CPAP-2010/57274/1/COT78.pd

Sazonalidade de crescimento e aspectos fenológicos de espécies arbóreas tropicais e seu potencial dendrocronológico.

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Resultados preliminares do plantio do ginseng-do-Pantanal (Pfaffia glomerata) no Pantanal.

A demanda crescente mundial por medicamentos fitoterápicos tem despertado a atenção de muitos pesquisadores para plantas que possuam este potencial. O ginseng é uma das plantas que têm se pelo uso na medicina popular. No Brasil, são encontradas 21 espécies de ginseng do gênero Pfaffia que ocorrem em florestas e campos (Siqueira, 1988). Pfaffia paniculata, uma das espécies de ginseng, é utilizada como tônica, afrodisíaca e até antidiabética pela medicina popular (Oliveira et al., 1980). Pfaffia jubata é citada para cólicas e enterites (Siqueira, 1981). Já Pfaffia glomerata, o ginsengo-do-pantanal, tem indicação popular para melhora da visão e memória (Pott & Pott, 1994). Essas espécies já têm suas propriedades medicinais confirmadas com o isolamento de princípio ativo de suas raizes (Nakal et al., 1984; Nishimoto et al., 1988; Shiobara et al., 1993). O ginseng-do-pantanal, milagroso ou malva-branca, é uma espécie nativa do Pantanal, ocorrendo com freqüência regular, principalmente nas sub-regiões do Paraguai e Nabileque em solos argilosos ricos em cálcio e matéria orgânica (Pott & Pott, 1994). A espécie está adaptada aos ciclos de cheia e seca da região, apresentando grande plasticidade às mudanças ambientais, o que pode facilitar o seu aproveitamento e cultivo. Apesar do grande potencial econômico, os estudos com o ginseng não têm progredido a contento, devido às dificuldades encontradas para o cultivo, por exemplo, para Pfaffia paniculata o peso das raízes ficou muito baixa do esperado (Fáfia, 1987). No presente estudo foram avaliadas: a percentagem de germinação, a fenologia (época de brotação, floração e frutificação) e a curva de crescimento de mudas de Pfaffia glomerata transplantadas em área experimental na sub-região ou Pantanal do Paraguai.bitstream/item/79543/1/COT49.pd