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Artigo
Combined effects of hydrothermally-altered feldspar and water regime on cadmium minimization in rice
(2022-12) Ribeiro, Paula Godinho; Martins, Gabriel Caixeta; Zhu, Xueqiang; Li, Yuncong C.; Guilherme, Luiz Roberto Guimarães
The accumulation of cadmium (Cd) in grains and edible parts of crops poses a risk to human health. Because rice is the staple food of more than half of the world population, reducing Cd uptake by rice is critical for food safety. HydroPotash (HYP), an innovative potassium fertilizer produced with a hydrothermal process, has the characteristics of immobilizing heavy metals and potential use for remediating Cd-contaminated soils. The objective of this study was to evaluate the HYP as a soil amendment to immobilize Cd in acidic soils and to reduce the accumulation of Cd in rice tissues. The experiment was performed in a greenhouse with a Cecil sandy loam soil (pH 5.3 and spiked with 3 mg Cd kg−1) under either flooding conditions (water level at 4 cm above the soil surface) or at field capacity. Two hydrothermal materials (HYP-1 and HYP-2) were compared with K-feldspar + Ca(OH)2 (the raw material used for producing HYP), Ca(OH)2, zeolite, and a control (without amendment). After 30 days of soil incubation, HydroPotashs, the raw material, and Ca(OH)2 increased both soil solution pH and electrical conductivity. These materials also decreased soluble Cd concentration (up to 99.7%) compared with the control (p < 0.05). After 145 days, regardless of the materials applied, plant growth was favored (up to 35.8%) under the flooded regime. HydroPotash-1 was more effective for increasing dry biomass compared with other amendments under both water regimes. HydroPotashs reduced extractable Cd in soil, Cd content in plant biomass at tillering and maturing stage, and were efficient in minimizing Cd accumulation in rice grains.
dissertação
Novas regras de aposentadoria e seus efeitos na motivação e no desempenho dos docentes: um estudo em escolas estaduais mineiras
(Universidade Federal de Lavras, 2026-06-25) Vieira, Carla Gravina; Oliveira, Denis Renato de; Vaz, Janderson Martins; Silva, Edimilson Eduardo da
The general objective of this study was to analyze the relationship between knowledge of the new retirement rules (Constitutional Amendment No. 104/2020 and Supplementary Law No. 156/2020) and the following elements: work motivation and the job performance of tenured teachers in state schools within the jurisdiction of the Coronel Fabriciano Regional Education Superintendence (SRE). To this end, the study aimed to: (1) describe the changes in specific retirement rules for tenured teachers in the Minas Gerais state education system; (2) understand the level of knowledge regarding this legislation among teachers in schools within the jurisdiction of the Coronel Fabriciano SRE; (3) identify the level of motivation among state school teachers within the jurisdiction of the Coronel Fabriciano SRE; and (4) analyze changes in the performance of school units within the jurisdiction of the Coronel Fabriciano SRE, based on teacher performance assessment results from 2015 to 2024. This research employed a mixedmethods approach (qualitative and quantitative) and was exploratory and descriptive in nature. Data collection involved the use of regulatory documents, a semi-structured questionnaire, and reports provided by DIAD - the Directorate of Assessment and Performance (regarding performance assessment scores for tenured teachers in the Coronel Fabriciano SRE from 2015 to 2024). The research sample comprised 123 tenured teachers from state schools within the Coronel Fabriciano SRE. The structured questionnaire data were subjected to descriptive analysis, correlation analysis, and linear regression. The data provided by DIAD were analyzed using correlation analysis and linear regression, while responses to the questionnaire's openended question were examined through Bardin’s (2015) thematic content analysis. Document analysis revealed that Constitutional Amendment No. 104/2020 and Supplementary Law No. 156/2020 altered retirement requirements for state teachers (e.g., minimum age, transition rules, and permanent rules). It was found that participants demonstrated greater knowledge regarding the general aspects of the new pension rules but less understanding of more specific regulatory details (such as transition rule criteria, the "pedágio" requirement, impacts on parity and fullsalary retirement, or distinctions between permanent and transitional rules). Regarding motivation and perceived performance, results showed that pension changes influenced teachers' career expectations, fostering perceptions of pension insecurity, frustration, and professional devaluation, although commitment to teaching and professional performance remained intact. Analysis of performance evaluation scores provided by DIAD showed no significant changes linked to the pension reforms, suggesting that results remained stable during the period analyzed. As a practical contribution, the research led to the creation of informational booklets for teachers and administrators in the state education system, offering guidance on pension rules and recommendations for initiatives aimed at professional appreciation and healthy career retention.
Artigo
A Ilha das Flores de Jorge Furtado: uma proposta para educação ambiental crítica a partir das visões de natureza
(2022-08-13) Rosa, Marllon Moreti de Souza; Ávila, Ana Luíza; Andrade, Mariana Aparecida Bologna Soares de; Festozo, Marina Battistetti
This paper aims to analyze the short film Flower Island (1989)by Jorge Furtado, seeking to identify the film’s potential for the development of a practice of Environmental Education in dialogue with the History and Philosophy of Science (HPS). In order to achieve this goal, a qualitative film analysis was developed. Afteranalysis, we realized that the movie has potential for a Critical Environmental Education in dialogue with the HPS, since it presents not only the environmental issue, but also historical, philosophical, cultural and social elements. We understand that the way human beings act on the environment is related to their Vision of Nature, and the main vision in the short film is the mechanistic Cartesian conception, a consequence of capitalist advance. Despite the Cartesian conception being predominant, itis possible to discuss different views that have emerged throughout history, opposing the idea of a supposed inexorability of reality. Hence, for a critical analysis of the environmental issue, it is important to understand the social relations that permeate the discourses, and the HPS helps in this understanding, offering theoretical-methodological instruments.
Artigo
Genetic variability in populations of Chrysoporthe cubensis and Chr. puriensis in Brazil
(2022-01) Oliveira, M. E. S.; Kanzi, Aquillah M.; Van der Merwe, Nicolaas Albertus (Albie); Wingfield, Michael J.; Wingfield, Brenda D.; Silva, G. A.; Ferreira, Maria Alves
Chrysoporthe puriensis, a sibling species of the well-known Eucalyptus canker pathogen Chr. cubensis, has recently been described from Brazil. Both species are thought to be native to South America, but previous population genetic analyses were conducted prior to the ready availability of robust markers such as microsatellites to test this hypothesis. The objective of this investigation was to analyse the structure and genetic variability of Chr. cubensis and Chr. puriensis populations from non-native Myrtaceae and native Melastomataceae hosts in Brazil, using microsatellite markers developed for this purpose. The fungal isolates were obtained from Eucalyptus species, Corymbia citriodora and Tibouchina species in different regions of the country. Isolates were separated into sub-populations based on host families (Melastomataceae and Myrtaceae) and on region of origin. There was high genetic variability in all sub-populations with the highest levels detected within, rather than among sub-populations. Gene and genotypic diversities were higher for the isolates from the Melastomataceae than the Myrtaceae isolates. High levels of gene flow were found between sub-populations based on host and geographic distribution of the sub-populations. The presence of genetically diverse Chr. cubensis and Chr. puriensis populations on native hosts in Brazil supports a Latin American centre of origin for the two pathogens. Both undergo sexual and asexual reproduction and have a high potential for gene flow.
Artigo
The analysis of macro processes of the cashier service in a supermarket organization: a case study of quality management and simulation
(2022-05-24) Melo, Gustavo Alves de; Peixoto, Maria Gabriela Mendonça; Barbosa, Samuel Borges; Mendonça, Maria Cristina Angélico de
This paper aimed to optimize the cashier service macroprocess in a supermarket located in the Alto Paranaiba. Decision-making tools were applied, such as brainstorming, process mapping, Ishikawa diagram and PDCA cycle. The simulation type was based on the M/M/1 model, in the context of Queuing Theory. Thus, factors such as customer satisfaction and increased productivity were sought through systematic control and continuous improvement of the cashiers' service macroprocess. Finally, the alignment carried out between the PDCA cycle and the Routine Management brought an effective contribution, represented by the standardization of the macroprocess, by the construction of Standard Operating Procedures (SOPs).