Principais Coleções do Repositório
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Sensoriamento próximo para caracterização de perfis de solos do Cerrado e Amazônia
(Universidade Federal de Lavras, 2025-09-30) Albuquerque, Carlos Victor Lima de; Albuquerque, Carlos Victor Lima de; Silva, Bruno Montoani; Tassinari, Diego; Serafim, Milson Evaldo
Tropical soils, especially Brazilian ones, are characterized by being deep. Due to high temperatures and humidity, they are also highly weathered, resulting in low fertility and high concentration of iron and aluminum oxides. The use of proximal sensors, such as portable X-ray fluorescence (pXRF) equipment, which determines the elemental composition of the analyzed material, has aided in this detailed, quantitative, and spatially explicit characterization of soil profiles through digital morphometrics. The first study area is represented by an area under different land uses (Annual Cultivation and Native Forest) with the same soil class, the Oxisols, in the Amazon biome. The second is a Catena, with the landscape located in the Cerrado biome, featuring distinct soil classes (Entisols - Psamments, Inceptisols, Oxisols and Entisols - Fluvents). The objective for the first area was to evaluate and characterize the attributes of four Amazonian Oxisol profiles: two in cultivated areas and two under native vegetation adjacent to the cultivated profiles. The study included textural variations within each land use (one pair of more clayey soil profiles and another pair more sandy). The second study aimed to evaluate and characterize soil profiles with digital morphometrics in a catena in the Cerrado with different soil classes. Digital morphometry revealed explicit variability in textural fractions (clay predominant at depth, sand at the surface) and in the distribution of chemical elements, even in supposedly homogeneous horizons and with distinct soil classes. The sensors and equipment used brought robustnessto the obtained results, aiding in the characterization of these profiles under conditions that have been little explored in previous studies on tropical soils.
Moléculas sinalizadoras na indução a tolerância aos estresses abióticos durante a germinação e desenvolvimento de plântulas de tomate tipo grape
(Universidade Federal de Lavras, 2025-09-12) Lima, Marília Botelho Barbosa; Santos, Heloísa Oliveira dos; Azevedo, Sebastião Márcio de; Pires, Raquel Maria de Oliveira; Carvalho, Rejane Rodrigues da Costa e
Physiological conditioning is one of the most sustainable and low-cost techniques used to obtain vigorous seedlings and induce tolerance to adverse situations. Given this, the objective of this study was to evaluate the effect of physiological conditioning on Solanum lycopersicum grape seeds subjected to different abiotic stresses. A completely randomized design with four replicates was used in a 5x4 factorial scheme, with 4 conditioning factors + 1 control and 4 stress conditions for germination. The seeds were subjected to conditioning for 24 hours in solutions of chitosan, hydrogen peroxide, and sodium nitroprusside, in addition to hydroconditioning and control. The germination process occurred in a saline medium, simulated by NaCl solution, dry, induced by polyethylene glycol (PEG), thermal, with alternating temperatures of 20-30oC, and distilled water simulating normal germination conditions. Thus, germination and seed vigor were determined through first germination count, IVG, T50, and image analysis tests. As a result of physiological conditioning, the use of the H2O2 molecule was beneficial in minimizing the effects of salinity and high temperatures. Thus, the use of signaling molecules via physiological conditioning is one of the promising alternatives in the face of environmental adversities.
Frangos alimentados com dietas contendo gordura de larvas de inseto em substituição ao óleo de soja
(Universidade Federal de Lavras, 2025-09-26) Almeida, Yan Andrade; Naves, Luciana de Paula; Orientador; Fonseca, Leonardo da Silva; Leão, Ana Patrícia Alves; dc.contributor.referee1; dc.contributor.referee2; dc.contributor.referee3; dc.contributor.referee4; dc.contributor.referee5
In poultry farming, the main source of lipids used in bird nutrition is soybean oil; however, alternative sources are important to increase the range of possibilities for the sector. In this context, black soldier fly larvae fat (BSLF) has become a possibility, as it presents an approximate yield of 40%, being rich in medium-chain fatty acids, such as lauric acid, which exhibits nutritional properties, in addition to antimicrobial functions and modulation of intestinal health. This research aimed to determine the effects of the increasing substitution of soybean oil (SO) by BSLF on parameters of lipid metabolism and the immune system, correlating them with the performance of broiler chickens. Five hundred broiler chickens were used, distributed in a completely randomized design, and five levels of soybean oil substitution by BSLF (0, 25, 50, 75 and 100%) in mash rations were evaluated. Each diet was evaluated in ten replicates with 10 birds each. Water and experimental feed were provided ad libitum from 22 to 38 days of age. The parameters analyzed were zootechnical performance, determined from 22 to 38 days of age, corresponding to feed consumption, weight gain, and feed conversion ratio of the chickens. On the 38th day of age, one chicken from each experimental unit was slaughtered to evaluate carcass and cut yield and to collect samples of pancreas, liver, and pectoralis major muscle, in which pancreatic lipase activity and the concentrations of hepatic fatty acid synthase and muscle carnitine were determined, respectively. In addition, during bleeding, blood aliquots were collected for subsequent quantification of interleukin-10 (IL-10) and tumor necrosis factor alpha (TNF-α) levels. There was no difference (P > 0.05) in the zootechnical performance of the chickens. However, 100% replacement of OS with GBSF resulted in higher (P < 0.05) breast yield. There was no change (P > 0.05) in pancreatic lipase activity, hepatic fatty acid synthase concentration, or serum concentrations of IL-10 and TNF- α (P > 0.05). However, increasing the rate of replacement of OS with GBSF resulted in a linear reduction in carnitine concentration in the chicken breast. It is concluded that increasing replacement of OS with GBSF does not induce modulation of pancreatic lipase and hepatic fatty acid synthase enzymes and does not alter the immune system of chickens. Total replacement of GBSF does not impair zootechnical performance, increases breast yield, and reduces carnitine concentration in the breast.
Anais do Simpósio Internacional de Ecologia Aplicada
(Ed. dos Autores, 2025-10-14) Rafael Dudeque Zenni (Organizador); Alessandra Angélica de Pádua Bueno (Organizador); Maria Fernanda Gomes Villalba Peñaflor (Organizador); Paulo dos Santos Pompeu (Organizador)
Anais do Simpósio Internacional de Ecologia Aplicada
Mapping of lignin distribution in the wood fiber wall of Corymbia citriodora by confocal raman microscopy
(2025-12-18) Lima, José Tarcício
Mapping of lignin distribution in the wood fiber wall of Corymbia citriodora by confocal Raman microscopy”, which aims to map lignin in the layers of the wood fiber wall of Corymbia citriodora using confocal Raman microscopy. The database mainly refers to .opus files collected during the scanning carried out within the confocal Raman microscope system itself. Based on this database, maps of lignin distribution in the wood fiber wall were produced.