http://repositorio.ufgd.edu.br/jspui/handle/prefix/51 2026-08-14T08:13:51Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6875 Título: Avaliação ambiental da aquicultura em tanques-rede em um assentamento rural: aplicação de ferramentas de sustentabilidade integrada Autor(es): Cabanha, Fernando da Silva Primeiro Orientador: Albuquerque, Daniele Menezes Abstract: Aquaculture represents an important productive activity for food supply and economic development. However, its expansion requires careful attention to environmental impacts and sustainability. In this context, this study analyzed Brazilian scientific production on aquaculture from an environmental perspective, aiming to identify patterns and trends in how research has addressed environmental impacts, monitoring, and assessment of aquatic organism farming practices. A cienciometric analysis was conducted using the Scopus database, applying the search strategy (“aquaculture” OR “fish farm*” OR “pisciculture”) AND (“environmental impact” OR “environmental assessment” OR “environmental monitoring”). After applying filters and manual validation, 203 articles published between 1996 and 2024 were selected. Analyses performed with the support of Excel, VOSviewer, and Biblioshiny indicated a significant increase in scientific output from 2010 onwards, highlighting the role of public institutions and international collaborations. The main research themes included water quality, heavy metals, sustainability, life cycle assessment, and microplastics. The results indicate that Brazilian research on aquaculture and the environment has consolidated as a multidimensional and interdisciplinary field, although gaps remain, particularly regarding small-scale aquaculture, continental systems, and socio-environmental approaches. Editor: Universidade Federal da Grande Dourados Tipo: Dissertação 2026-04-13T00:00:00Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6874 Título: Avaliação da viabilidade produtiva de meio alternativo à base de Lemna minor para o cultivo de Chlorella sp Autor(es): Andrade , Bruna Aparecida Mortari de Primeiro Orientador: Paz, Marcelo Fossa da Abstract: Currently, microalgae represent one of the most promising sources for generating bio-inputs, but the greatest difficulty faced is the high cost of culture media. Therefore, given the scarcity of studies on new formulations, the present work aims to evaluate the behavior of the microalga of the genus Chlorella in a medium enriched with the extract of the macrophyte Lemna minor, which is easily found in large quantities in the natural environment, to quantify the amount of protein generated by the microalga in an alternative medium, and to verify the effectiveness of cryopreservation of the species through the maintenance of its viability. The water sample was obtained from the Itá stream, in the Barra do Itá settlement, in Bela Vista – MS. Isolation was performed using the “streak plating” method, in which a sample of the obtained water was subjected to streaking using a platinum loop on a Petri dish containing a solid medium composed of agar (1%) and NPK agricultural fertilizer (10-10-10 1.0 g.L-1). After plating, the plates were kept on a bench under a 16-hour photoperiod until the first isolated colonies grew. To prepare the extract, 2.5% w/v of dried and crushed L. minor was added to distilled water, which was kept boiling for 15 minutes. Tests showed that the medium enriched with 1% and 2% Lemna minor was more nutritious for Chlorella sp. compared to the adapted BBM medium. Macronutrient analyses of the 2.5% Lemna minor extract show that this macrophyte has a high nutritional content, largely due to its ability to absorb large quantities of nutrients present in the culture medium. However, further academic research is needed on the use of this macrophyte as a nutrient source for other microorganisms and on other potential nutrient suppliers for new alternative media formulations. The study also demonstrated that the cryopreservation of Chlorella sp. At -80°C using 10% glycerol as a cryoprotectant, it is viable for short to medium term storage (up to 42 days), maintaining cell viability and recovery capacity after thawing. Editor: Universidade Federal da Grande Dourados Tipo: Dissertação 2026-02-26T00:00:00Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6852 Título: Desenvolvimento e caracterização de catalisadores à base de óxidos de molibdênio e ferro suportados em sílica mesoporosa para a conversão do glicerol em solketal Autor(es): Gonzalez, Adriene de Moura Barboza Primeiro Orientador: Carvalho, Cláudio Teodoro de Abstract: Biodiesel is a renewable alternative to fossil fuels gradually introduced into the Brazilian energy matrix. However, it faces challenges, including the need to diversify raw materials and sustainable management of glycerol, its main byproduct. The large amount of glycerol generated during biodiesel production demands solutions to enhance its economic value, which has encouraged the development of new catalysts to convert it into higher-value compounds, such as solketal, a promising fuel additive that improves performance and reduces emissions. This study aimed to develop and characterize iron and molybdenum oxide-based catalysts supported on mesoporous silica for application in the conversion of glycerol to solketal via acetalization. The catalyst synthesis included characterization techniques to evaluate structural and surface properties, such as X-ray diffraction (XRD), which revealed amorphous or crystalline structures depending on the synthesis methodology. Textural studies demonstrated the formation of a mixed mesoporous network with type IV isotherms, an important characteristic for catalytic processes. ICP-OES analyses confirmed that iron and molybdenum contents remained close to the theoretical values with negligible losses during synthesis. The thermal stability of the catalysts was assessed by TG-DTA, showing greater thermal stability in bimetallic materials compared to molybdenum monometallics. Additionally, XPS and Raman spectra confirmed the presence of molybdenum (VI) and iron (III) in the samples, while FTIR analysis using pyridine as a probe revealed the formation of Lewis and Brønsted acid sites, essential for efficient conversion of glycerol to solketal. Catalytic tests indicated that the synthesized catalysts are promising, with the best performance recorded for the C_FeMo2 catalyst, which achieved a glycerol conversion rate above 70% and solketal selectivity of 97% at room temperature (25±1 °C) after 90 minutes of reaction. These results highlight the potential of iron and molybdenum bimetallic catalysts as a sustainable alternative for adding value to glycerol, contributing to the economic and environmental feasibility of biodiesel production in Brazil. Editor: Universidade Federal da Grande Dourados Tipo: Tese 2024-08-23T00:00:00Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6850 Título: Perspectivas curriculares na formação inicial de professores indígenas de matemática na região Centro-Oeste Autor(es): Rockenbach, Nara Machado Primeiro Orientador: Miola, Adriana Fatima de Souza Abstract: This dissertation investigates the curricular perspectives that guide the initial training of indigenous teachers in the field of Mathematics in the Central-West Region of Brazil, focusing on the Intercultural Indigenous Teacher Training programs offered by the State University of Mato Grosso (UNEMAT) and the Federal University of Grande Dourados (UFGD). The research was guided by the following investigative question: In what ways do the Pedagogical Course Projects (PPC) of these programs shape the initial training of indigenous mathematics teachers in light of the intercultural perspective and the demands of Indigenous peoples? The general objective was to understand how these PPCs structure teacher training, articulating documentary analysis with the perspectives of teacher trainers regarding the social, cultural, and pedagogical dimensions of this formative process. Methodologically, this is a qualitative, documentary research study, complemented by semi-structured interviews with instructors from the investigated courses. Data analysis was conducted using Discursive Textual Analysis (DTA). The theoretical framework is based on the contributions of Ubiratan D’Ambrosio's Ethnomathematics, Ole Skovsmose's Critical Mathematics Education, and discussions on interculturality and decoloniality. The results show that intercultural mathematics training in these courses is structured around the articulation between curriculum, territory, and language, revealing formative processes that seek to integrate academic knowledge and indigenous wisdom. It is concluded that the analyzed teacher training programs constitute formative spaces that challenge traditional models of mathematics teaching, promoting educational practices guided by dialogue between epistemologies and the valorization of the sociocultural experiences of indigenous peoples. Editor: Universidade Federal da Grande Dourados Tipo: Dissertação 2026-03-24T00:00:00Z