Principais Coleções do Repositório
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O paradoxo da inércia: uma análise institucional sobre mudança e estabilidade na apropriação da sustentabilidade no setor da cachaça artesanal
(Universidade Federal de Lavras, 2025-11-14) Ferreira, Robson de Castro; Brito, Mozar José de; Borges, Alex Fernando; Castro, Cleber Carvalho d; Pinheiro, Daniel Calbino; Baetâ, Odemir Vieira
This study investigates the complex process of sustainability logic appropriation by micro and small pot still cachaça distilleries. This sector, of profound cultural and economic relevance to Brazil, operates embedded in strong traditions, inertia, and institutional voids. Faced with increasing pressure for responsible socio-environmental practices, the research seeks to answer why and how these organizations, situated in a complex institutional field, assimilate, practice, or resist the logic of sustainability. The theoretical framework articulates Institutional Theory, focusing on the concepts of logics, institutional work, and inertia, in dialogue with Practice Theories. The methodology, qualitative in approach and guided by assumptions of empirical constructionism, is based on a multiple case study of eight distilleries representing the sector's diversity. The thesis is structured into integrated chapters that, grounded in a preliminary meta-synthesis and integrative review, build a robust analytical framework for the indepth empirical investigation of the cases, moving away from fragmentation into isolated articles. The results reveal that sustainability appropriation is a heterogeneous phenomenon, unfolding into multiple trajectories contingent upon the nature of the actors' agency (entrepreneurial, heir-driven, or collective), the dominant institutional logic in each organization (market, tradition, or political), and the paradoxical role of inertia, which manifests simultaneously as a barrier to change and as a strategic asset for identity preservation. It is concluded that understanding the sector's transition toward sustainability requires an analytical model that recursively integrates these variables, overcoming linear views of institutional change
Dinâmica da comunidade microbiana de Bokashi e efeito no desenvolvimento inicial de Mimosa caesalpiniifolia Benth.
(Universidade Federal de Lavras, 2025-10-03) Andrade, Ricardo Coelho; Jesus, Ederson da Conceição; Guerra, José Guilherme Marinh; Resende, Alexander Silva de; Abreu, Carlos Godinho de; Faria, Sérgio Miana de
The use of native microorganisms collected from natural environments to produce fermented bioinputs such as Bokashi represents a promising agroecological strategy. These microorganisms exhibit high functional diversity, providing ecosystem services such as nutrient cycling, plant growth promotion, and pathogen suppression. When incorporated into organic substrates such as plant bran, they act as biological catalysts in the fermentation process, promoting partial decomposition of organic matter and the synthesis of plant-beneficial secondary metabolites. This not only increases nutrient bioavailability but also supports beneficial rhizosphere colonization when the bioinput is applied to the soil. In addition, the production of fermented compost contributes to farmer autonomy, potentially reducing reliance on chemical inputs while fostering the restoration of soil health through the reactivation of microbial ecosystem services in degraded soils. This work is organized into three chapters: the general introduction (Chapter 1), the characterization and microbial dynamics of Bokashi fermentation with native microorganisms (Chapter 2), and the evaluation of the compost as an inoculum source for Mimosa caesalpiniifolia Benth. seedlings (Chapter 3). The results demonstrated that Bokashi fermentation inoculated with native microorganisms followed a well-defined microbial succession. Early stages were dominated by fermentative yeasts (Pichia, Torulaspora) and lactic acid bacteria (Lactiplantibacillus, Lacticaseibacillus). Over time, bacterial genera associated with polymer degradation and agronomic potential, such as Bacillus and Streptomyces, emerged, along with filamentous fungi such as Aspergillus and Xeromyces, capable of exploiting more recalcitrant substrates and contributing to the biocontrol of soil pathogens. When evaluated as an inoculum source, the concentrated form of the compost favored greater bacterial diversity, whereas the diluted form supported greater fungal diversity, indicating that different inoculation regimes modulate rhizosphere composition. These findings reinforce the potential of Bokashi inoculated with native microorganisms as a viable alternative for introducing beneficial microbial communities that deliver ecosystem services in the soil, thereby contributing to greater sustainability and ecological resilience of production systems.
Hormonal balance during floral development in Coffea arabica
(Universidade Federal de Lavras, 2025-12-17) Peralta, Catherine Oliveira; Chalfun Júnior, Antonio; Saczk, Adelir Aparecida; Azevedo,Lillian Magalhães; Peres, Lázaro Eustáquio Pereira; Oliveira, Raphael Ricon de
In Coffea arabica, phenological stages are influenced by climatic conditions. Factors such as photoperiod, rain, and temperature affect the hormone concentration in coffee plants, which can induce the transition of plants from the vegetative to the reproductive stages. During the period from flowering induction to bud formation, different hormones play specific roles in regulating flowering and subsequent fruit production. It is believed that hormones such as gibberellins (GA), abscisic acid (ABA), salicylic acid (SA), and ethylene, may be involved modulating the expression of genes involved in flowering induction and development. Therefore, this study aimed to investigate the hormonal regulation during the reproductive period of coffee plants. To better understand hormonal regulation, leaf and flower bud samples were collected monthly from March (induction of flowering) to September (after anthesis), and the endogenous concentrations of GA1, GA3, ABA, and AS were quantified. These variations in hormone levels were compared to environmental conditions recorded during the reproductive period. The following year, plant growth regulators corresponding to these hormones were applied in the field, specifically in March. Samples were collected pre- and post-application, and hormone concentrations were quantified to determine whether the applied dosage modulated endogenous levels. This study revealed that hormonal balance is contingent on environmental factors and tissue specificity throughout each developmental stage. Furthermore, this research proposes specific dosages for future studies involving the application of plant growth regulators in Coffea arabica. Finally, this study demonstrates how the regulation of these plant hormones occurs during the reproductive stage of coffee, enabling the development of strategies for applying growth regulators in the field to modulate reproductive development.
Admissões e óbitos por insuficiência cardíaca e infarto agudo do miocárdio no estado de Minas Gerais análises de séries temporais
(Universidade Federal de Lavras, 2025-12-12) Cintra, Priscila Rabelo; Pereira, Luciano José; Pala, Luiz Otávio Oliveira; Nunes, Maria do Carmo Pereira
Cardiovascular diseases (CVD) remain among the leading causes of morbidity and mortality worldwide and in Brazil, with acute myocardial infarction (AMI) and heart failure (HF) standing out as major contributors. These conditions are closely linked in both their pathophysiological mechanisms and risk factors. In this context, the present study aimed to conduct a comprehensive temporal analysis of hospital admissions and deaths due to AMI and HF in adults over 20 years of age in the state of Minas Gerais, Brazil, from 2016 to 2022, considering sex differences and associated comorbidities. Data were obtained from the Hospital Information System of the Brazilian Unified Health System (SIH-SUS), encompassing all hospital admissions recorded in the state. To examine temporal trends and fluctuations, autoregressive moving average models with exogenous covariates (ARMAX) were applied, including the evaluation of seasonal components and potential interventions related to external events, such as the COVID-19 pandemic. A total of 90,670 hospitalizations due to AMI were recorded, with a mean lethality rate of 8.5%, and 178,477 hospitalizations due to HF, with a lethality rate of 10%. AMI was more prevalent among men, whereas HF predominated in women, suggesting distinct patterns of vulnerability between sexes. Winter periods were significantly associated with increased hospitalizations for both conditions, indicating a possible influence of environmental and seasonal infectious factors. Additionally, hospitalizations for respiratory diseases showed a positive correlation with the risk of cardiovascular events, reinforcing the role of systemic inflammation and acute respiratory infections as triggers for cardiac decompensation. During the COVID-19 pandemic, a marked reduction in CVD hospitalizations was observed, likely due to mobility restrictions, patients’ fear of seeking hospital care, and the reorganization of healthcare services. However, in September 2020, there was a significant increase in male deaths from AMI, suggesting a delayed cardiovascular impact of the pandemic. Another noteworthy finding was the inverse relationship between AIDS-related hospitalizations and HF deaths in women, possibly reflecting differences in clinical follow-up and the cardioprotective effects of antiretroviral therapy. Trend analyses revealed divergent patterns between the two diseases: while HF hospitalizations showed a downward trend, AMI hospitalizations tended to increase over time, reflecting potential changes in the epidemiological profile and the effectiveness of preventive and therapeutic strategies. In summary, this study highlights that seasonal and infectious factors exert a significant influence on the behavior of cardiovascular diseases, and that the pandemic period introduced transient alterations in hospitalization and mortality curves. These findings reinforce the importance of continuous epidemiological surveillance and the strengthening of public health policies aimed at prevention, early diagnosis, and effective management of CVD, with particular attention to sex differences and associated comorbidities
Gradual-release nitrogen supplementation in late gestation : effects on maternal performance, physiology, metabolism, and offspring early development in beef cattle
(Universidade Federal de Lavras, 2025-09-30) Cediel Devia, Diana Carolina; Gionbelli, Mateus Pies; Nascimento, Karolina Batista; Gionbelli , Tathyane Ramalho Santos; Paula, Nelcino Francisco de; Meneses, Javier Andrés Moreno
In tropical beef systems, late gestation often coincides with forage shortages, challenging maternal–fetal nutrition. Therefore, this study aimed to evaluate slow-release nitrogen supplementation as a strategy to improve maternal metabolism and fetal development in cows fed low-quality forage. Thirty-three pregnant Brahman cows were used. From days 180 to 270 of gestation, one of three diets were randomly assigned to cows: (1) Control (CON; basal diet), (2) regular protein (REG; soybean meal + urea, 40% CP), or (3) Slow-release nitrogen-based supplement (SRN, Timafeed Boost, Roullier Group, Saint-Malo, France; 40% CP). Cows were housed individually and fed twice daily until calving. After calving, cow–calf pairs grazed pasture with creep feeding until weaning. Statistical differences were considered when P < 0.05. At 270 days of gestation, body weight (BW) and empty BW were greater in REG and SRN than CON (P < 0.01). Total average daily gain (ADG) and empty body gain increased with supplementation (P < 0.01), whereas gestational tissue ADG was unaffected (P = 0.23). Maternal tissue mobilization occurred across groups but was less pronounced in REG and SRN (P < 0.01). Both supplementation programs increased feed intake, total-tract apparent digestibility, and nitrogen balance (P < 0.01). Plasma glucose, IGF-1, and citrulline were greater in supplemented cows, whereas urea was highest in REG, intermediate in SRN, and lowest in CON (P ≤ 0.01). REG also increased the sum of nonessential and glucogenic amino acids (P ≤ 0.05). Calf birth weight was not affected by supplementation programs (P = 0.13), but by weaning, calves from supplemented dams were heavier than those from CON (P = 0.04). In conclusion, protein supplementation during late gestation, either conventional or SRN-based, improved maternal performance, and supported greater postnatal calf growth under tropical conditions.