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Degradação da glicose pelo bacterioplâncton: mineralização e formação de produtos intermediários
(Universidade Federal de São Carlos, 2002-12-10) Panhota, Rafael Spadaccia; Bianchini Júnior, Irineu; https://lattes.cnpq.br/0659731944736389
This study aimed compare the bacterioplankton heterotrofic potential and the routes of glucose mineralization, and also determined some polymeric monossacharides produced by bacterioplankton. Water samples were collected in the Barra Bonita reservoir SP (22º32 34.5 S and 48º29 26.4 W) in two periods (February/01 e July/01), filtered and enriched with glucose. The samples were incubated at 20ºC during 60 days, under aerobic and anaerobic conditions. During the experimental period, aliquots were collected from the mineralization flasks to determine the organic carbon concentration (dissolved and particulate). The global decay coefficient and the coefficients of the three routes admitted by the glucose mineralization model were determined through kinetics fitting. In February (rainy season), the mineralization coefficients were higher ( 10 times) than the mineralization coefficients of July (drought season). In both periods, the anaerobic metabolism showed greater mineralization coefficients (1.4 times in February and 1.1 times in July), than the aerobic one. On the other hand, the carbon immobilization (COP formation) was greater in the aerobic metabolism compared with anaerobic metabolism, in the two periods. The water samples, collected in March/02 in the same place described above, were taken to determine the total and dissolved monosaccharides from polymeric polysaccharide released by bacterioplankton during glucose mineralization. These samples were filtered, enriched with glucose and incubated at 20ºC during 30 days, under aerobic conditions. During that period, aliquots were colleted from the mineralization flasks to determine the monosaccharides concentration. The monosaccharides: arabinose, fucose, galactose and rhamnose were found. Rhamnose showed the greater amount in comparison with other monosaccharides.
A dimensão ambiental no desenvolvimento profissional de professores e professoras das escolas rurais
(Universidade Federal de São Carlos, 2002-12-10) Zakrzevski, Sônia Beatris Balvedi; Sato, Michele; https://lattes.cnpq.br/9264997837722900
This work aims to reflect on the continued formation in Environmental Education of rural school teachers. In recovering the story of education in rural environment, the research highlights the negligence with the education in this environment and the lack of research and intervention in Environmental Education turned into the population of the field, a marginalized and forgotten people, who is suffering the impacts of the Brazilian rural development model, generator of several economical, social and ecological problems. It aims to discuss the insertion of Environmental Education in school curriculums, and in reflecting about the main tendencies of it, rescues its story in gauche school. From the analysis of the main tendencies and approaches in teachers formation, it reports and discusses a research-action (comprehended as a strengthening of the action in the reflection and in the disruption of subject-object to subject-subject, as an incentive to participative autonomy of schooling group for a critical incorporation of Environmental Education in school curriculums), developed in four towns in the north region of the State of Rio Grande do Sul/ Brazil. The work developed with rural teachers reinforced a collective posture and stimulated teachers to make a profound study toward the comprehension of their own practice. The research, an instrument taken from the teachers hands, contributed for the formation of individuals capable to create a different rural world. This research made us to recognize some limitations of the research-action regarding its emancipatory attributes. We concluded that the fact teachers have formed a political conscience; starting to be more active and critical, not always make them autonomous, free to give their work the direction they wish. This thesis is just the beginning of a long debate, which deserves more attention by the people who work in the education field, recognizing it as an essence in the construction of any thought that might contribute for the humane development inserted in environmental contexts.