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1.
Virtual Screening Based on Ligand and Structure with in vitro Assessment of Neolignans against Trypanosoma cruzi
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Maia, Mayara S.
; Andrade, Rodrigo S.
; Sousa, Julyanne M. S.
; Sousa, Natália F.
; Rodrigues, Gabriela C. S.
; Menezes, Renata P. B.
; Silva, Marcelo S.
; Tavares, Josean F.
; Rodrigues, Klinger A. F.
; Scotti, Luciana
; Scotti, Marcus T.
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Journal of the Brazilian Chemical Society
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Chagas disease, caused by the parasite Trypanosoma cruzi, occurs most commonly in Latin America. As the treatment is highly toxic and ineffective in the chronic phase of the disease, alternative treatments are needed. Through quantitative structure-activity relationship modeling (QSAR) analysis using ligand-based and structure-based virtual screening methods, we predicted the trypanocidal potential of 47 neolignans against three targets, the enzymes cruzain, trypanothione reductase, and sterol 14-alpha demethylase. A combined analysis allowed for the selection of potent inhibitors against Trypanosoma cruzi. Of these compounds, two were isolated and shown to inhibit the growth of epimastigotes at concentrations of 9.64 and 8.72 µM, and trypomastigote forms at 4.88 and 2.73 µM. Therefore, the compounds (2R, 3R)-2,3-dihydro-2 (4 methoxyphenyl)-3-methyl-5-(E)-propenylbenzofuran (46) and ottomentosa (47) may be a good option of growth inhibitors for the parasite stages and warrant additional study.
2.
Impact of ultrasound treatment on viability of Staphylococcus aureus and the human milk antioxidant activity
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GOMES, Nayara Resende
; PARREIRAS, Paola Machado
; MENEZES, Camila Carvalho
; FALCO, Thaís Silva
; VIEIRA, Michele Cristina
; PASSOS, Maria Cristina
; CUNHA, Luciana Rodrigues
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Abstract This study aimed to evaluate the application of thermosonication for the viability of Staphylococcus aureus and the antioxidant activity of HM. The US effect on the S. aureus was measured by counting viable cells in discarded HM immediately before and after different treatments varying time (1, 5 and 10 minutes) and temperature (20, 30, 40, 50 and 60 °C) through surface plating on standard agar. The antioxidant activity evaluation was carried out by 2, 2-diphenyl-1-picrylhydrazyl (DPPH) scavenging method. With Regarding microbiological quality, it can be concluded that treatment with US at 60 °C for 10 minutes was the most effective in terms of reducing the viability of S. aureus, in addition to presenting a significant increase in the content of antioxidants when compared to raw and pasteurized milk samples.
3.
Reference values and drivers of diversity for South Brazilian grassland plant communities
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MENEZES, LUCIANA S.
; ELY, CLEUSA V.
; LUCAS, DIÓBER B.
; MINERVINI-SILVA, GRAZIELA H.
; VÉLEZ-MARTIN, EDUARDO
; HASENACK, HEINRICH
; TREVISAN, RAFAEL
; BOLDRINI, ILSI IOB
; PILLAR, VALÉRIO D.
; OVERBECK, GERHARD E.
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Anais da Academia Brasileira de Ciências
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Abstract The South Brazilian grasslands (Campos Sulinos) form the dominant vegetation in southern Brazil. They are species-rich ecosystems that occur under distinct geomorphological and climatic conditions but spatial variation of plant species diversity remains understudied. Here, we present a detailed description of plant communities across the region. Our data were obtained in 1080 plots, representing well-preserved grasslands in different ecological systems. Apart from describing alpha and beta diversity, we investigated the relations of plant communities with environmental features. We identified 759 plant species and found clear differences in community composition across the region. Northern and Southern highland grasslands, humid and dry coastal grasslands and the mesic Pampa grassland were clearly distinct, related to climatic and edaphic features. While species abundance distribution was markedly uneven, local species richness was high, above 20 species/m2, especially in the highlands and in mesic Pampa sites, on shallow soils. The predominant component of beta diversity was species turnover, which suggests that a network of well-conserved grasslands distributed across the region would be the best strategy to protect plant diversity. Our results establish regionalized reference values for richness and diversity that can be useful for initiatives of restoration and conservation of these grasslands.
4.
Antifungal and anti-biofilm effect of the calcium channel blocker verapamil on non-albicans Candida species
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SCORZONI, LILIANA
; MENEZES, RAQUEL T. DE
; PEREIRA, THAIS C.
; OLIVEIRA, PRISCILA S.
; RIBEIRO, FELIPE DE CAMARGO
; SANTOS, EVELYN LUZIA DE SOUZA
; FUGISAKI, LUCIANA R.O.
; OLIVEIRA, LUCIANE D. DE
; AMORIM, JOSÉ BENEDITO O.
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Anais da Academia Brasileira de Ciências
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Abstract Candida is a human fungal pathogen that causes a wide range of diseases. Candida albicans is the main etiologic agent in these diseases; however, infections can be caused by non-albicans Candida species. Virulence factors such as biofilm production, which protect the fungus from host immunity and anti-fungal drugs, are important for the infection. Therefore, available antifungal drugs for candidiasis treatment are limited and the investigation of new and effective drugs is needed. Verapamil is a calcium channel blocker with an inhibitory effect on hyphae development, adhesion, and colonization of C. albicans. In this study, we investigated the effect of verapamil on cell viability and its antifungal and anti-biofilm activity in non-albicans Candida species. Verapamil was not toxic to keratinocyte cells; moreover, C. krusei, C. parapsilosis, and C. glabrata were susceptible to verapamil with a minimal inhibitory concentration (MIC) of 1250 μM; in addition, this drug displayed fungistatic effect at the evaluated concentrations. After treatment with verapamil, reduced viability, biomass, and mitochondrial activity were observed in biofilms of the non-albicans Candida species C. krusei, C. glabrata, and C. parapsilosis. These findings highlight the importance of the study of verapamil as an alternative treatment for infections caused by non-albicans Candida species.
https://doi.org/10.1590/0001-3765202020200703
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5.
Análise do perfil lipídico de pacientes submetidos à gastrectomia vertical e à derivação gástrica em Y de Roux.
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Lira, Natália S.
; Macedo, Carlos Eduardo Soares
; Belo, Giselle Menezes
; Santa-Cruz, Fernando
; Siqueira, Luciana T.
; Ferraz, Álvaro Antonio Bandeira
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Revista do Colégio Brasileiro de Cirurgiões
- Métricas do periódico
RESUMO Objetivo: comparar as melhorias no perfil lipídico de pacientes submetidos à gastrectomia vertical (GV) e à derivação gástrica em Y de Roux (DGYR). Metódos: estudo de coorte misto, em que foram avaliados 334 pacientes submetidos à GV e 178 pacientes submetidos à DGYR no Hospital das Clínicas da Universidade Federal de Pernambuco e no Real Hospital Português de Beneficência, Recife, PE, Brasil. Foram realizadas dosagens séricas de colesterol total, LDL, HDL e triglicerídeos no pré-operatório e com três, seis, 12 e 24 meses de seguimento. Resultados: o grupo submetido à GV foi composto por 58 homens e 276 mulheres. No grupo submetido à DGYR, foram analisados 64 homens e 114 mulheres. A média de idade foi de 37,2±20,5 anos no grupo da GV e de 41,9±11,1 anos no grupo da DGYR. O IMC médio pré-operatório foi de 39,4±2,6kg/m2 e 42,7±5,8kg/m2, para o grupo da GV e da DGYR, respectivamente. No pré-operatório, 80% dos pacientes tinha, no mínimo, uma anormalidade no perfil lipídico. Dois anos após a cirurgia houve melhora do colesterol total, LDL, HDL e triglicerídeos no grupo submetido à DGYR. No grupo submetido à GV, após dois anos houve melhora dos níveis de colesterol total, HDL e triglicerídeos, apenas. Conclusão: ambas as técnicas resultaram em melhorias no perfil lipídico, porém a DGYR foi mais efetiva.
ABSTRACT Objective: to compare the improvements in lipid profile in patients undergoing sleeve gastrectomy (SG) and Roux-en-Y gastric bypass (RYGB). Methods: in a mixed cohort study, we evaluated 334 patients undergoing SG and 178 patients undergoing RYGB at the University Hospital of the Federal University of Pernambuco and at the Real Hospital Português de Beneficência, Recife, PE, Brazil. We measured serum levels of total cholesterol, LDL, HDL and triglycerides preoperatively and at three, six, 12 and 24 months follow-up. Results: the SG group consisted of 58 men and 276 women. In the group submitted to RYGB, there were 64 men and 114 women. The mean age was 37.2±20.5 years in the SG group and 41.9±11.1 years in the RYGB group. The preoperative mean BMI was 39.4±2.6kg/m2 and 42.7±5.8kg/m2 for the SG and RYGB groups, respectively. In the preoperative period, 80% of the patients had at least one abnormality in the lipid profile. Two years after surgery, there was improvement in total cholesterol, LDL, HDL and triglycerides in the group submitted to RYGB. In the group submitted to SG, after two years there was improvement in total cholesterol, HDL and triglyceride levels. Conclusion: both techniques resulted in improvements in the lipid profile, but the RYGB was more effective.
https://doi.org/10.1590/0100-6991e-20181967
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6.
Floristic and structural patterns in South Brazilian coastal grasslands
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- Métricas do periódico
RESUMO A vegetação natural da região costeira sul brasileira inclui formações campestres que são pouco consideradas nas políticas de conservação, devido a falta de conhecimento sobre estes ecossistemas. Esse estudo reporta resultados de um levantamento em escala regional da vegetação campestre costeira ao longo de um gradiente de 536 km no sul do Brasil. Amostramos 16 áreas ao longo da planície costeira com 15 parcelas (1m²) por área. Todas as áreas eram pastejadas por gado. Estimamos cobertura de espécies de plantas, altura da vegetação, porcentagem de solo descoberto, mantilho e esterco, e classificamos as espécies de acordo com suas formas de crescimento. Encontramos 221 espécies, 14 dessas exóticas e duas ameaçadas. As gramas prostradas: Axonopus aff.affinis, Paspalum notatum e P. pumilumestavam entre as espécies mais importantes. Espécies de gramíneas prostradas representaram a cobertura vegetal mais importante, seguidas por gramas cespitosas. Altura da vegetação, solo descoberto, mantilho e esterco foram similares entre todas as áreas, destacando a homogeneidade das áreas amostrais devido ao manejo similar. Em comparação com outras formações campestres no sul do Brasil, os campos costeiros apresentaram riqueza de espécies bastante baixa. A presença de altos valores de solo descoberto em todas as áreas amostrais indica a necessidade de discutir as práticas de manejo na região, especialmente no que diz respeito a intensidade de pastejo do gado.
ABSTRACT The natural vegetation of Southern Brazil's coastal region includes grasslands formations that are poorly considered in conservation policy, due to the lack of knowledge about these systems. This study reports results from a regional-scale survey of coastal grasslands vegetation along a 536 km gradient on southern Brazil. We sampled 16 sites along the coastal plain with 15 plots (1 m²) per site. All sites were grazed by cattle. We estimated plant species cover, vegetation height, percentage of bare soil, litter and manure, and classified species according to their growth forms. We found 221 species, 14 of them exotic and two threatened. The prostate grasses: Axonopus aff.affinis, Paspalum notatum and P. pumilumwere among the most important species. Prostrate graminoids species represented the most important vegetation cover, followed by cespitose grasses. Vegetation height, bare soil, litter and manure were similar among all areas, highlighting the homogeneity of sampling sites due to similar management. In comparison to other grasslands formations in Southern Brazil, the coastal grasslands presented rather low species richness. The presence of high values for bare soil at all sampling sites indicates the need to discuss management practices in the region, especially with regard to the intensity of livestock grazing.
https://doi.org/10.1590/0001-3765201520140555
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7.
Update of the Brazilian floristic list of Algae and Cyanobacteria
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Menezes, Mariângela
; Bicudo, Carlos E. M.
; Moura, Carlos W. N.
; Alves, Aigara M.
; Santos, Alana A.
; Pedrini, Alexandre de G.
; Araújo, Andréa
; Tucci, Andrea
; Fajar, Aurelio
; Malone, Camila
; Kano, Cecília H.
; Sant'Anna, Célia L.
; Branco, Ciro Z.
; Odebrecht, Clarisse
; Peres, Cleto K.
; Neuhaus, Emanuel B.
; Eskinazi-Leça, Enide
; Aquino, Eveline
; Nauer, Fabio
; Santos, Gabriel N.
; Amado Filho, Gilberto M.
; Lyra, Goia M.
; Borges, Gyslaine C.P.
; Costa, Iara O.
; Nogueira, Ina de S.
; Oliveira, Ivania B.
; Paula, Joel. C.de
; Nunes, José M. de C.
; Lima, Jucicleide C.
; Santos, Kleber R.S.
; Ferreira, Leandro C.
; Gestinari, Lísia M.S.
; Cardoso, Luciana S.
; Figueiredo, Marcia A.O.
; Silva, Marcos H.
; Barreto, Maria B.B.B.
; Henriques, Maria C.O.
; Cunha, Maria da G.G.S.
; Bandeira-Pedrosa, Maria E.
; Oliveira-Carvalho, Maria F.
; Széchy, Maria T.M.
; Azevedo, Maria T.P.
; Oliveira, Mariana C. de
; Cabezudo, Mariê M.
; Santiago, Marilene F.
; Bergesh, Marli
; Fujii, Mutuê T.
; Bueno, Norma C.
; Necchi Jr., Orlando
; Jesus, Priscila B.
; Bahia, Ricardo G.
; Khader, Samir
; Alves-da-Silva, Sandra M.
; Guimarães, Silvia M.P.B.
; Pereira, Sonia M.B.
; Caires, Taiara A.
; Meurer, Thamis
; Cassano, Valéria
; Werner, Vera R.
; Gama Jr., Watson A. da
; Silva, Weliton J. da
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Resumo Apresenta-se uma síntese atualizada de informações sobre algas no Brasil objetivando refinar os dados reunidos até o presente, bem como avaliar os avanços sobre o conhecimento da diversidade de algas no país desde a publicação do Catálogo de Plantas e Fungos do Brasil. Os resultados de 2015 mostraram um acréscimo de 1.250 espécies (35.7%) a um total de 4.747 em relação a 2010. As classes mais diversas em número de espécies foram Bacillariophyceae, Conjugatophyceae, Florideophyceae, Cyanophyceae, Dinophyceae e Euglenophyceae. Bacillariophyceae e Cyanophyceae tiveram o maior acréscimo de espécies no intervalo de cinco anos. A região Sudeste e Sul foram as mais diversas, porém, as regiões Nordeste com os estados do Piauí e Sergipe e Centro-Oeste com os estados de Mato Grosso, Goiás e Distrito Federal destacaram-se no cenário da biodiversidade nacional. Apesar da escassez de taxonomistas e da infraestrutura limitada, os resultados obtidos evidenciaram um avanço significativo no conhecimento da diversidade de algas no país nesse período de cinco anos, iniciando uma mudança quanto as diferenças geográficas regionais.
Abstract An updated synthesis of cyanobacteria and algae information is presented for Brazil aiming to refine the data gathered to date and evaluate the progress of the biodiversity knowledge about these organisms in the country since the publication of the Catálogo de Plantas e Fungos do Brasil. The results of 2015 showed an increase of 1,250 species (35.7%) when compared to 2010, reaching a total of 4,747 species. The most diverse classes in species number were the Bacillariophyceae, Conjugatophyceae, Florideophyceae, Cyanophyceae, Dinophyceae and Euglenophyceae. Bacillariophyceae and Cyanophyceae had the highest increase in species number in the five-year interval. The Southeast and South regions were the most diverse, however, the Northeast, with the states of Piauí and Sergipe, and the Central-west region, with Mato Grosso, Goiás and Distrito Federal, also stood out in the national algal biodiversity scenario. Despite the shortage of taxonomists and limited infrastructure, the results showed a significant improvement in the knowledge regarding the diversity of cyanobacteria and algae in the country during the study period, starting to even out regional geographical differences caused by subsampling.
https://doi.org/10.1590/2175-7860201566408
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Growing knowledge: an overview of Seed Plant diversity in Brazil
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Zappi, Daniela C.
; Filardi, Fabiana L. Ranzato
; Leitman, Paula
; Souza, Vinícius C.
; Walter, Bruno M.T.
; Pirani, José R.
; Morim, Marli P.
; Queiroz, Luciano P.
; Cavalcanti, Taciana B.
; Mansano, Vidal F.
; Forzza, Rafaela C.
; Abreu, Maria C.
; Acevedo-Rodríguez, Pedro
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; Almeida Jr., Eduardo B.
; Almeida, Gracineide S.S.
; Almeida, Rafael F.
; Alves, Flávio M.
; Alves, Marccus
; Alves-Araujo, Anderson
; Amaral, Maria C.E.
; Amorim, André M.
; Amorim, Bruno
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; Andreata, Regina H.P.
; Andrino, Caroline O.
; Anunciação, Elisete A.
; Aona, Lidyanne Y.S.
; Aranguren, Yani
; Aranha Filho, João L.M.
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Resumo Um levantamento atualizado das plantas com sementes e análises relevantes acerca desta biodiversidade são apresentados. Este trabalho se iniciou em 2010 com a publicação do Catálogo de Plantas e Fungos e, desde então vem sendo atualizado por mais de 430 especialistas trabalhando online. O Brasil abriga atualmente 32.086 espécies nativas de Angiospermas e 23 espécies nativas de Gimnospermas e estes novos dados mostram um aumento de 3% da riqueza em relação a 2010. A Amazônia é o Domínio Fitogeográfico com o maior número de espécies de Gimnospermas, enquanto que a Floresta Atlântica possui a maior riqueza de Angiospermas. Houve um crescimento considerável no número de espécies e nas taxas de endemismo para a maioria dos Domínios (Caatinga, Cerrado, Floresta Atlântica, Pampa e Pantanal), com exceção da Amazônia que apresentou uma diminuição de 2,5% de endemicidade. Entretanto, a maior parte das plantas com sementes que ocorrem no Brasil (57,4%) é endêmica deste território. A proporção de formas de vida varia de acordo com os diferentes Domínios: árvores são mais expressivas na Amazônia e Floresta Atlântica do que nos outros biomas, ervas são dominantes no Pampa e as lianas apresentam riqueza expressiva na Amazônia, Floresta Atlântica e Pantanal. Este trabalho não só quantifica a biodiversidade brasileira, mas também indica as lacunas de conhecimento e o desafio a ser enfrentado para a conservação desta flora.
Abstract An updated inventory of Brazilian seed plants is presented and offers important insights into the country's biodiversity. This work started in 2010, with the publication of the Plants and Fungi Catalogue, and has been updated since by more than 430 specialists working online. Brazil is home to 32,086 native Angiosperms and 23 native Gymnosperms, showing an increase of 3% in its species richness in relation to 2010. The Amazon Rainforest is the richest Brazilian biome for Gymnosperms, while the Atlantic Rainforest is the richest one for Angiosperms. There was a considerable increment in the number of species and endemism rates for biomes, except for the Amazon that showed a decrease of 2.5% of recorded endemics. However, well over half of Brazillian seed plant species (57.4%) is endemic to this territory. The proportion of life-forms varies among different biomes: trees are more expressive in the Amazon and Atlantic Rainforest biomes while herbs predominate in the Pampa, and lianas are more expressive in the Amazon, Atlantic Rainforest, and Pantanal. This compilation serves not only to quantify Brazilian biodiversity, but also to highlight areas where there information is lacking and to provide a framework for the challenge faced in conserving Brazil's unique and diverse flora.
https://doi.org/10.1590/2175-7860201566411
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9.
Assessment of metal concentration in the Billings Reservoir sediments, São Paulo State, Southeastern Brazil
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Hortellani, Marcos A.
; Sarkis, Jorge E. S.
; Menezes, Luciana C. B.
; Bazante-Yamaguishi, Renata
; Pereira, Alder S. A.
; Garcia, Priscila F. G.
; Maruyama, Lídia S.
; Castro, Paula M. Gênova de
.
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Journal of the Brazilian Chemical Society
- Métricas do periódico
A contaminação por metais em 47 amostras de sedimentos (fração < 63 µm) coletadas em 13 pontos de pesca no reservatório Billings foi avaliada utilizando quatro metodologias: normas de qualidade de sedimentos (SQG S), índice de geoacumulação (I Geo), índice de poluição metálica (MPI) e análises estatísticas. Somente Fe e Co parecem estar associados com a composição natural do sedimento ou processos de intemperismo natural, enquanto Al, Cd, Cr, Cu, Hg, Mn, Ni, Pb, and Zn mostraram aumento em suas concentrações, sugerindo associação com fontes antropogênicas. MPI identificou as áreas mais críticas em relação à concentração total de metais enquanto I Geo identificou o metal específico para cada área. A sazonalidade sobre os níveis dos metais foi avaliada usando análise de variância (ANOVA) e gráfico de caixa. Somente o gráfico de caixa sugeriu um pequeno aumento na contaminação por Hg and Pb durante o período com muita chuva e também indicou altas concentrações de Cu e Zn em um dos pontos analisados com a incidência de valores fora do normal e extremos. Portanto, políticas ambientais devem ser adotadas para reduzir a contaminação por metais.
Four approaches were applied to evaluate the metal contamination in 47 sediment samples (< 63 µm fraction) collected at 13 fishing points of the Billings Reservoir: sediment quality guidelines (SQGs), geoaccumulation index (I Geo), metal pollution index (MPI) and statistical analyses. Only Fe and Co concentrations seemed to be associated with crustal material or natural weathering processes, while Al, Cd, Cr, Cu, Hg, Mn, Ni, Pb and Zn showed increases in their concentrations, which seemed to be associated with anthropogenic sources. MPI identified the most critical sites in relation to the total metal accumulation while I Geo identified the specific metal accumulation for each site. Analysis of variance (ANOVA) and box plot method were performed to evaluate seasonal effects on the metal levels. Only box plot suggested a slight increase in Hg and Pb contamination during heavy rainy periods and also indicated high concentrations of Cu and Zn in one of the analyzed point, with incidence of outliers and extreme values. Thus, an environmental policy in order to reduce these metal contaminations must be adopted.
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10.
Occurrence of Staphylococcus aureus in raw milk produced in dairy farms in São Paulo state, Brazil
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Fagundes, Helena
; Barchesi, Luciana
; Nader Filho, Antonio
; Ferreira, Luciano Menezes
; Oliveira, Carlos Augusto Fernandes
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The objective of the present study was to evaluate the occurrence of Staphylococcus aureus in milk produced in 37 farms located in the regions of Ribeirão Preto and São Carlos, state of São Paulo, Brazil. Two-hundred and eight samples of milk from individual cows showing subclinical mastitis, and 37 samples of bulk tank milk were analyzed. S. aureus strains were detected in 18 (7.3%) milk samples: 14 (6.7%) from samples of individual cows, and 4 (10.8%) from bulk tank milk. Two individual milk samples (14.3%) and two bulk milk samples contained enterotoxigenic S. aureus. PFGE analysis revealed the genetic heterogeneity of the strains isolated from raw milk, which presented to 13 S. aureus patterns. Results confirmed the potential transmission of staphylococcal food poisoning to consumers via milk of cows affected by subclinical mastitis, mainly when raw milk is ingested.
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11.
Chemical composition and cholinesterase inhibition of essential oils of three chemotypes from Croton zehntneri
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Santos, Hélcio S.
; Furtado, Elaine F.
; Bertini, Luciana M.
; Bandeira, Paulo N.
; Albuquerque, Maria R. J. Ribeiro
; Menezes, Jane E. S. Alencar
; Trevisan, Maria Teresa S.
; Lemos, Telma L. G
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Croton zehntneri Pax. & K. Hoffm. (Euphorbiaceae) is an aromatic plant native of the northeaster region of Brazil; and is popularly known as "canela de cunhã". The chemical composition of the essential oils from leaves, stalks and roots from three chemotypes of C. zehntneri obtained by hydrodistillation were analyzes by GC-MS. E-anethole, was the main component in the essential oils of all plants parts of che-motype 1. While the phenylpropanoids stragole, eugenol, Z-methyl isoeugenol and E-methyl isoeugenol were the major component in the essential oils of chemotypes 2 and 3, respectively. On TLC the essential oils and the major compounds showed an acetylcholine esterase inhibitory effect.
Croton zehntneri Pax. & K. Hoffm. (Euphorbiaceae) es una planta aromática nativa de la región nororiental de Brasil, y es popularmente conocido como "canela de cunhã". La composición química de los aceites esenciales de hojas, tallos y raíces de três quimiotipos de C. zehntneri obtenido mediante hidrodestilación fueron examinados por GC-MS. E-anetol, fue principal componente en los aceites esenciales de todas las partes de la planta de quimiotipo 1. Si bien la fenilpropanóides estragol, eugenol, Z-metil isoeugenol and E-metil isoeugenol fueron el componente principal en los aceites esenciales de quimiotipos 2 e 3, respectivamente. El TLC estos aceites esenciales y los principales compuestos mostraron una acetilcolina esterase efecto inhibitorio.
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12.
Habitat use by a tree frog species of Scinax (Amphibia, Hylidae) at an urban forest fragment from south-eastern Brazil
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Galdino, Conrado A. B.
; Carvalho Jr., Ronald R.
; Menezes, Mauren A. V. Noronha e
; Nascimento, Luciana B.
.
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No presente estudo é tratado o uso do hábitat por Scinax aff. perereca, durante o período de agosto de 1996 a agosto de 1997 em uma área de mata urbana em Belo Horizonte, Minas Gerais, sudeste do Brasil. Machos em atividade de vocalização foram encontrados em setembro, outubro e dezembro de 1996 e de fevereiro a abril e junho de 1997. As fêmeas foram capturadas apenas em outubro de 1996. Os indivíduos foram encontrados em galhos da vegetação no solo ou em pedras próximas a quedas de água. Na área estudada, S. aff. perereca usa nove tipos de substratos, sendo os mais freqüentes a vegetação herbácea, pedras na margem do riacho e troncos caídos. O padrão de ocupação espacial variou ao longo dos meses. Os machos foram encontrados vocalizando em agregados e a largura de nicho espacial foi diretamente relacionada a abundância da espécie.
We studied the pattern of habitat use by the tree frog Scinax aff. perereca. Fieldworks were performed from August 1996 to August 1997 at Parque das Mangabeiras, Belo Horizonte, State of Minas Gerais, southeastern Brazil. Calling males were observed in September, October and December 1996, February to April and June 1997. Females were found only in October 1996. Specimens were found perched on vegetation, on the ground or on stones near waterfall. At Parque das Mangabeiras, S. aff. perereca occupied nine types of substrata. The most frequently used substrata were shrubs, stones at the stream edges, and fallen trunks. The pattern of spatial occupation varied among months. Males were found calling in aggregations on the vegetation and spatial niche breadth was related to species abundance.
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13.
Chemotherapeutic effects on larval stages of Schistosoma mansoni during infection and re-infection of mice
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Revista da Sociedade Brasileira de Medicina Tropical
- Métricas do periódico
A susceptibilidade dos estágios larvais do Schistosoma mansoni aos esquistossomicidas praziquantel e oxamniquine foi testada em camundongos durante infecção primária ou secundária, e após diferentes intervalos de tempo após a exposição cercariana. A avaliação foi feita pela contagem dos vermes após recuperação destes por perfusão do sistema porto-mesentérico e pelo estudo morfométrico dos mesmos. O estudo revelou que a relativa resistência das formas larvais aos esquistossomicidas, já demonstrada em infecção primária, persiste no caso de hospedeiros já infectados. Este fato indica que uma falha terapêutica pode resultar quando o tratamento é feito em hospedeiros re-infectados recentemente, em virtude dos mesmos apresentarem formas migrantes e imaturas do parasita, as quais são particularmente resistentes aos esquistossomicidas.
The sensitivity of the larval stages of Schistosoma mansoni to chemotherapy with praziquantel and oxamniquine was tested in mice during primary and secondary infections and after different intervals from cercarial exposure. Worm recovery by perfusion of the porto-mesenteric system, followed by counting and a morphometric study of the parasite, allowed the conclusion that the relative resistance of the larval stages of S. mansoni to schistosomicide drugs, demonstrated in primary infections, also persists when the host is already infected. This indicates that a therapeutic failure may result when an infected host is treated some time after being re-infected, because of the presence of migrating, drug-resistant, immature forms of the parasite.
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