Principais Coleções do Repositório
Submissões Recentes
Artigo
Two new species of Calonectria (Hypocreales, Nectriaceae) causing Eucalyptus leaf blight in Brazil
(2022-07-29) Sanchez-Gonzalez, Enrique I.; Soares, Thaissa de Paula Farias; Zarpelon, Talyta Galafassi; Zauza, Edival Angelo Valverde; Mafia, Reginaldo Gonçalves; Ferreira, Maria Alves
In recent decades, commercial Eucalyptus plantations have expanded toward the warm and humid regions of northern and northeastern Brazil, where Calonectria leaf blight (CLB) has become the primary fungal leaf disease of this crop. CLB can be caused by different Calonectria species, and previous studies have indicated that Calonectria might have high species diversity in Brazil. During a disease survey conducted in three commercial plantations of Eucalyptus in northeastern Brazil, diseased leaves from Eucalyptus trees with typical symptoms of CLB were collected, and Calonectria fungi were isolated. Based on phylogenetic analyses of six gene regions (act, cmdA, his3, rpb2, tef1, and tub2) and morphological characteristics, two new species of Calonectria were identified. Five isolates were named as C. paragominensis sp. nov. and four were named as C. imperata sp. nov. The pathogenicity to Eucalyptus of both species was confirmed by fulfilling the Koch’s postulates.
dissertação
Effects of ultrasound and sodium reduction on restructured cooked ham formulated with PSE pork loin
(Universidade Federal de Lavras, 2026-08-07) Graciano, Amanda Camilo; Ramos, Eduardo Mendes; Ramos, Alcinéia de Lemos Souza; Paula, Marielle Maria de Oliveira; Silva, Douglas Roberto Guimarães e
Developing cooked cured meat products with superior technological quality and lower sodium content has become a significant challenge for the food industry, primarily due to limitations associated with the use of PSE meat and NaCl reduction in formulations. In this context, emerging technologies such as high-intensity ultrasound are being investigated as alternatives to improve water retention, texture, and structural stability in processed products. Thus, the objective of this study was to evaluate the effects of ultrasound application on the technological quality of cooked cured products made from PSE and RFN meat. Two experiments were conducted to evaluate the effects of ultrasound on cooked ham products made from RFN and PSE pork. In the first experiment, different ultrasound power levels and durations at 20 kHz were evaluated (255 and 400 W for 5, 10, and 15 min). In the second study, ultrasound at 20 kHz and 450 W for 10 min was applied in conjunction with sodium reduction treatments and partial NaCl replacement with KCl: a control with 1.8% NaCl (CT), partial replacement with 1.08% NaCl + 0.75% KCl (RTK), and NaCl reduction to 0.75% (RT). The results demonstrated a significant effect (P<0.05) of raw material quality on technological parameters. In the first study, cooked hams made from RFN meat exhibited lower cooking loss (4.34%) and greater hardness (83.66 N) compared to PSE products, which showed higher cooking losses (6.28%) and lower hardness (66.99 N). Residual nitrite levels were also higher in RFN products (52.26 mg/kg) compared to PSE products (26.72 mg/kg). In the second experiment, RFN products exhibited lower reheating losses (5.59%) and higher chewiness (20.39 N), whereas PSE products showed higher losses (7.92%) and lower chewiness (17.12 N). Severe NaCl reduction significantly increased cooking loss (11.78%) and reduced hardness (60.94 N), while partial substitution with KCl maintained values similar to the control. Ultrasound treatment had a limited effect, reducing only syneresis (5.69%) and losses during initial freezing cycles, with no significant changes in pH, instrumental color, or lipid oxidation. Thus, raw material quality was the primary factor determining the products' technological performance, with RFN meat yielding better results than PSE meat. Ultrasound showed complementary potential but was insufficient to fully offset the negative effects associated with PSE meat and low-sodium formulations.
Artigo
What is the role of volunteer work in protected areas? A case study in Brazil
(2022-06-30) Silveira Junior, Wanderley Jorge da; Santana, Lucas Dezidério; Souza, Cléber Rodrigo de; Yaguinuma, Renata Vichi; Gomes, Carolina Ribeiro; Fontes, Marco Aurélio Leite
Currently, protected areas around the world have a demand for volunteer work. At the same time, people in several countries that house protected areas seek out these spaces to serve as volunteers. This process occurs in a scenario strongly influenced by the neoliberal economy, which is marked by cuts in environmental management budgets and increased protected areas visitation. Based on this context, the objective was to analyze the role of volunteer work in protected areas in the context of neoliberal paradigm predominance. For this purpose, it was established a current overview of volunteer activity through a case study in Brazil by collecting information from volunteers and managers, heads or managers of protected areas receptive to volunteer work in interviews using structured questionnaires. It was found that Parques Nacionais are the categories with the greatest demand for volunteer work. It was also found the most part of volunteers is between 20 and 30 years old, and their education level is higher education in undergraduate courses related to biological sciences. It was identified significant differences between the perceptions of managers and volunteers about volunteer work objectives. However, both groups indicated that “Environmental education/environmental interaction and interpretation” and “Support for visitation” are the most frequently performed activities, and the main form of support and trade-off for volunteer work is the offering of certificates. Thus, volunteer work seeks to contribute to the protected areas objectives by supporting the management of these areas during public use activities. However, in the current scenario, this work is palliative in the face of the impacts of the dismantling of environmental policy that affects most countries that have Protected areas and have surrendered to neoliberal conservation.
Artigo
Phylogeny of Mesitiinae (Hymenoptera: Bethylidae): assessing their classification, character evolution and diversification
(2022-11-22) Barbosa, Diego Nunes; Hermes, Marcel Gustavo; Lepeco, Anderson
We present the first phylogenetic hypothesis for Mesitiinae based on 112 morpho-structural characters and 61 species. The results did not support Argaman’s tribal classification for Mesitiinae, since no tribes were found to be monophyletic. Anaylax was found to be paraphyletic, and Gerbekas, Heterocoelia, Parvoculus, Pycnomesitius, Sulcomesitius, Zimankos were found to be polyphyletic. Two new genera are proposed and described: Hadesmesitius gen. nov. and Brachymesitius gen. nov.; Botoryan is considered as a junior synonym for Zimankos. Three species status are revalidated; and 11 species combinations were proposed, so that all genera are now monophyletic. The results indicate the thickness of integument in Mesitiinae could be related to their protection against their hosts.
Artigo
Diversity and conservation of birds associated with an urban landscape in the southwest Brazilian Amazon
(2023-01-27) Moura, Aloysio Souza de; Candido, Edilson; Machado, Felipe Santana; Leite, Leandro Henrique; Mariano, Ravi Fernandes; Fontes, Marco Aurélio Leite
The Amazon presents an arc of deforestation which has expanded into natural areas and bird community studies in these areas are incipient for urban landscapes after transformation. Therefore, the bird community in an urban landscape in the southwest Amazonian region within an area in the arc of deforestation was investigated. The observations were performed through linear transects, during the wet and dry seasons of 2013. Records were obtained using binoculars and cameras. A total of 191 species of birds were recorded. The species accumulation curve was not reaching the asymptote, showing that new species can be recorded with a sampling effort increase. The community has low richness as a result of pressure on Amazonian environments and a high degree of anthropization. However, there is relevant composition, because nectarivores, insectivorous, carnivores, omnivores, and granivores were found in all environments, as well as endemic and threatened species.