Candido Lima da Silva Dias: da Politécnica aos primórdios da FFCL da USP

Pós-graduação em Educação Matemática - IGCE

Genotoxic effect of phenol on the cells of onion (Allium cepa ) roots

The roots of onion (Allium cepa ) stand out for having cells with large size and small number of chromosomes. These characteristics make them useful in bioassays for the measurement of a variety of cytogenetic and morphological parameters, in which they can be used as toxicity indicators of the induction and formation of micronuclei and chromosomal aberrations. Based on this background, the potential genotoxic effect of phenol concentration on cells of A. cepa roots was investigated either in terms of induced aberrations or micronuclei formation. The results demonstrated that the higher the concentration of phenol, the higher the incidence of abnormalities, thus confirming the genotoxicity of this pollutant.

Um passeio pelos bosques ficcionais de Antonio Tabucchi

The Italian writer Antonio Tabucchi (Pisa-1943, Lisbon-2012) is considered by the critic as one of the most representative voices in the contemporary European literature. The Literature, according to Tabucchi, exerts a fundamental role in society and it, still according to the writer, must cause disquietude, evoke doubts, raise questions and not tranquilize people’s mind. Thereby, it’s noticed that it’s one of the reasons why the tabucchian narrative incessantly dialogues with Luigi Pirandello’s and Fernando Pessoa's poetics, establishing a great fictional game in wich the people, the truths, the history and the world are shown, at the least, duplicated.

Biomass burning fuel consumption rates: a field measurement database

Landscape fires show large variability in the amount of biomass or fuel consumed per unit area burned. Fuel consumption (FC) depends on the biomass available to burn and the fraction of the biomass that is actually combusted, and can be combined with estimates of area burned to assess emissions. While burned area can be detected from space and estimates are becoming more reliable due to improved algorithms and sensors, FC is usually modeled or taken selectively from the literature. We compiled the peerreviewed literature on FC for various biomes and fuel categories to understand FC and its variability better, and to provide a database that can be used to constrain biogeochemical models with fire modules. We compiled in total 77 studies covering 11 biomes including savanna (15 studies, average FC of 4.6 t DM (dry matter) ha 1 with a standard deviation of 2.2), tropical forest (n = 19, FC = 126 +/- 77), temperate forest (n = 12, FC = 58 +/- 72), boreal forest (n = 16, FC = 35 +/- 24), pasture (n = 4, FC = 28 +/- 9.3), shifting cultivation (n = 2, FC = 23, with a range of 4.0-43), crop residue (n = 4, FC = 6.5 +/- 9.0), chaparral (n = 3, FC = 27 +/- 19), tropical peatland (n = 4, FC = 314 +/- 196), boreal peatland (n = 2, FC = 42 [42-43]), and tundra (n = 1, FC = 40). Within biomes the regional variability in the number of measurements was sometimes large, with e. g. only three measurement locations in boreal Russia and 35 sites in North America. Substantial regional differences in FC were found within the defined biomes: for example, FC of temperate pine forests in the USA was 37% lower than Australian forests dominated by eucalypt trees. Besides showing the differences between biomes, FC estimates were also grouped into different fuel classes. Our results highlight the large variability in FC, not only between biomes but also within biomes and fuel classes. This implies that substantial uncertainties are associated with using biome-averaged values to represent FC for whole biomes. Comparing the compiled FC values with co-located Global Fire Emissions Database version 3 (GFED3) FC indicates that modeling studies that aim to represent variability in FC also within biomes, still require improvements as they have difficulty in representing the dynamics governing FC.

A questão da experiência estética nos debates de epistemologia da comunicação

In the outline of communication epistemology, the article discusses the fluid and complex delimitations of the field of social communication and its intersections with the world of aesthetics. It includes the question of aesthetic experience and its presence in the epistemological debates on communication in Brazil. It tries to identify possible contributions of the phenomenology of aesthetic experience, based upon the teachings of Mikel Dufrenne and the theoretical references proposed by John Dewey, Paul Valéry, Luigi Pareyson and Jacques Rancière, to the studies on communication. To contextualize the articulations between communication and aesthetics in the debates developed in the Working Group on Communication Epistemology, the article briefly explores the works that discussed that intersection over the last ten years.