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Prevalência de leveduras da espécie Saccharomyces cerevisiae na produção de etanol: seleção de linhagens promissoras para o melhoramento da eficiência produtiva
(Universidade Federal de São Carlos, 2026-01-07) Silva, Dario Sampaio da; Cunha, Anderson Ferreira da; https://lattes.cnpq.br/0329741640375661; https://lattes.cnpq.br/6773069968922725; https://orcid.org/0009-0001-6976-4098
Fuel ethanol production in Brazil relies on the performance of industrial Saccharomyces cerevisiae yeasts, which are subjected to successive stresses during the fermentative process. In this study, twenty industrial strains were evaluated through the integration of molecular and physiological analyses, using strain CAT-1 as a control, with the aim of selecting promising strains for industrial application. Molecular analyses confirmed the identity of the strains as S. cerevisiae and revealed high genetic diversity, with the formation of four main genotypic groups, in addition to strains displaying unique genotypic profiles. Physiological performance, assessed based on growth profiles in different media, enabled the calculation of the Total Performance Index (TPI), highlighting strains 2018-12, 2018-08, 2023-02, and 2022-13 as exhibiting superior growth compared to the control. Acid stress tolerance, evaluated through viability and cell concentration after acid treatment, was integrated into the Acid Treatment Tolerance Index (ATI), identifying strains 2022-15 and 2023-06 as among the most resistant. The combined analysis of TPI and ATI allowed the classification of the strains into three distinct physiological profiles: high growth performance with low acid tolerance; high acid tolerance with moderate performance; and a balanced profile between growth and stress tolerance. In this context, strains 2022-13 and 2022-04 stood out for their balanced performance, emerging as the most promising candidates for application in industrial ethanol production processes. These results demonstrate that the integration of molecular and physiological approaches is an efficient strategy for selecting yeasts adapted to the industrial fermentative environment.
Conjunto de dados da tese "A artesania sociológica de Heleieth Iara B. Saffioti (1934–2010): trajetória e práxis"
(Universidade Federal de São Carlos, 2026-01-07) Moraes, Samantha Camacam de; https://lattes.cnpq.br/5705942169738314; https://orcid.org/0000-0001-5058-8445
Os Awaeté e os Toria: associativismo e relações interétnicas na TI Apyterewa
(Universidade Federal de São Carlos, 2026-01-07) Daniel, Sofia Scanavini; Carvalho, Joelson Gonçalves de; https://lattes.cnpq.br/0141039743607067; https://orcid.org/0000-0003-4894-1400; https://lattes.cnpq.br/6231265590580046
The Apyterewa Indigenous Land, located in the state of Pará, has been subject to systematic invasions and attacks since the 1980s. Within this context is situated the Parakanã Indigenous people, who self-identify as Awaeté. This study seeks to understand the relational dynamics between the Parakanã and the Associação Indígena Tato’a (AIT), which constitutes the sole representative entity of the people in their relations with the State and partner organizations, and whose team is composed of both Indigenous and non-Indigenous members. The analysis is based on an ethnographic study conducted during the General Assembly of the Parakanã People, which served as a space for meetings among indigenist agencies, partner organizations, the AIT, and the community. In order to examine the internal functioning of the association, an interview was carried out with Tato’a’s technical advisor. Given that the focus of the research lies in the community’s perspectives on the association, semi-structured interviews were also conducted with five Indigenous participants, who articulated their views regarding the association’s work, achievements, and relationships with the non-Indigenous staff employed by the AIT. To apprehend the nuances of each interview, the method of content analysis was employed. Based on the findings of the research, it can be concluded that the relationship between the Indigenous community and the association extends beyond that of a people and the entity that represents or supports them. The AIT has become the voice, organizational form, and locus of resistance of the Parakanã people themselves, managed in accordance with their own interests. The relationship with non-Indigenous individuals working within the AIT is not devoid of criticism, yet it operates both within professional and bureaucratic domains and within the sphere of informal relations, shaped by socio-affective ties.
Controle de velocidade de um robô móvel autônomo utilizando lógica fuzzy
(Universidade Federal de São Carlos, 2026-01-07) Souza, Hugo da Silva e; Inoue, Roberto Santos; https://lattes.cnpq.br/6221209121565990; https://orcid.org/0000-0003-2813-9330; https://lattes.cnpq.br/1424302433606983
The increasing adoption of autonomous mobile robots in industrial, logistics, and academic applications imposes significant challenges on speed control, especially in scenarios subject to nonlinearities, uncertainties, and load variations. Traditionally, speed control is performed using classical controllers, such as the Proportional–Integral (PI) controller, which provides satisfactory performance in linear systems but exhibits limitations under dynamic operating conditions. In this context, this work proposes the development and validation of a fuzzy logic–based speed control system applied to a differential-drive autonomous mobile robot. The fuzzy controller was designed using a Mamdani-type inference system, with the speed error and the variation of the error as input variables and an incremental control output. The methodology included experimental plant characterization, embedded system implementation, and experimental tests under different load conditions. The performance of the fuzzy controller was compared with that of a classical PI controller using metrics such as response time, steady-state error, and the Integral of Absolute Error (IAE). Experimental results demonstrate that the fuzzy controller achieved improved robustness and superior speed tracking performance, particularly under load variations, validating the proposed hypothesis and highlighting the potential of fuzzy logic for mobile robotics applications.