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1.
Predicting soybean grain yield using aerial drone images
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Andrade Júnior, Aderson S. de
; Silva, Silvestre P. da
; Setúbal, Ingrid S.
; Souza, Henrique A. de
; Vieira, Paulo F. de M. J.
; Casari, Raphael A. das C. N.
.
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Revista Brasileira de Engenharia Agrícola e Ambiental
- Métricas do periódico
RESUMO O estudo objetivou avaliar a capacidade de índices de vegetação (IV) obtidos de imagens aéreas por veículo aéreo não tripulado em estimar a produtividade de grãos de soja, nas condições de solo e clima da microrregião de Teresina, Piauí, Brasil. Avaliou-se a cultivar de soja BRS-8980, em estádio R5, submetida a dois regimes hídricos (RH) (100 e 50% da evapotranspiração da cultura - ETc) e dois níveis de N (com e sem suplementação de N). O delineamento experimental foi o de blocos ao acaso, em parcelas subdivididas, sendo as parcelas os regimes hídricos e as subparcelas os níveis de nitrogênio, com cinco repetições. Cada parcela continha 20 linhas de 4,5 m de comprimento, espaçadas de 0,5 m entre linhas, com área de 45 m² e uma área útil para avaliação da produtividade de grãos de 6 m². Avaliaram-se 20 IV obtidos de imagens aéreas de câmera multiespectral, os quais foram correlacionados com medidas de produtividade de grãos em campo. Adotaram-se análises de correlação de Pearson, de regressão linear e de autocorrelação espacial (índice I de Moran global e local) para geração e análise de desempenho dos IV na predição da produtividade de grãos. Para validação dos modelos de regressão linear, usou-se os índices R2, RMSE e nRMSE. O modelo de predição baseado no EVI-2 apresenta elevada aleatoriedade espacial, para todos os tratamentos avaliados, e menores erros de predição iguais a 149,68 kg ha-1 (sem suplementação de N) e 173,96 kg ha-1 (com suplementação de N).
ABSTRACT This study aimed to evaluate the ability of vegetation indices (VIs) obtained from unmanned aerial vehicle (UAV) images to estimate soybean grain yield under soil and climate conditions in the Teresina microregion, Piaui state (PI), Brazil. Soybean cv. BRS-8980 was evaluated in stage R5 and submitted to two water regimes (WR) (100 and 50% of crop evapotranspiration - ETc) and two N levels (with and without N supplementation). A randomized block design in a split-plot scheme was used, in which the plots were the water regimes and the subplots N levels, with five replicates. Each plot contained twenty 4.5 m-long rows, spaced 0.5 m apart, with a total area of 45 and 6 m² study area for grain yield evaluations. Twenty VIs obtained from multispectral aerial images were evaluated and correlated with grain yield measurements in the field. Pearson’s correlation, linear regression, and spatial autocorrelation (Global and Local Moran’s I) were used to analyze the performance of the VIs in predicting grain yield. The R2, RMSE and nRMSE indices were used to validate the linear regression models. The prediction model based on EVI-2 exhibited high spatial randomness for all the treatments, and smaller prediction errors of 149.68 and 173.96 kg ha-1 (without and with N supplementation, respectively).
2.
REMOTE DETECTION OF WATER AND NUTRITIONAL STATUS OF SOYBEANS USING UAV-BASED IMAGES
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Andrade Junior, Aderson S. de
; Silva, Silvestre P. da
; Setúbal, Ingrid S.
; Souza, Henrique A. de
; Vieira, Paulo F. de M. J.
.
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ABSTRACT Digital aerial images obtained by cameras embedded in remotely piloted aircraft (RPA) have been used to detect and monitor abiotic stresses in soybeans, such as water and nutritional deficiencies. This study aimed to evaluate the ability of vegetation indexes (VIs) from RPA images to remotely detect water and nutritional status in two soybean cultivars for nitrogen. The soybean cultivars BONUS and BRS-8980 were evaluated at the phenological stages R5 and R3 (beginning of seed enlargement), respectively. To do so, plants were subjected to two water regimes (100% ETc and 50% ETc) and two nitrogen (N) supplementation levels (with and without). Thirty-five VIs from multispectral aerial images were evaluated and correlated with stomatal conductance (gs) and leaf N content (NF) measurements. Near-infrared (NIR) spectral band, enhanced vegetation index (EVI), soil-adjusted vegetation index (SAVI), and renormalized difference vegetation index (RDVI) showed linear correlation (p<0.001) with gs, standing out as promising indexes for detection of soybean water status. In turn, simplified canopy chlorophyll content index (SCCCI), red-edge chlorophyll index (RECI), green ratio vegetation index (GRVI), and chlorophyll vegetation index (CVI) were correlated with NF (p<0.001), thus being considered promising for the detection of leaf N content in soybeans.
3.
COVID-19 in the Perioperative Period of Cardiovascular Surgery: the Brazilian Experience
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Gomes, Walter J.
; Rocco, Isadora
; Pimentel, Wallace S.
; Pinheiro, Aislan H. B.
; Souza, Paulo M. S.
; Costa, Luiz A. A.
; Teixeira, Marjory M. P.
; Ohashi, Leonardo P.
; Bublitz, Caroline
; Begot, Isis
; Moreira, Rita Simone L
; Hossne Jr, Nelson A.
; Vargas, Guilherme F.
; Branco, João Nelson R.
; Teles, Carlos A.
; Medeiros, Eduardo A. S.
; Sáfadi, Camila
; Rampinelli, Amândio
; Moratelli Neto, Leopoldo
; Rosado, Anderson Rosa
; Mesacasa, Franciele Kuhn
; Capriata, Ismael Escobar
; Segalote, Rodrigo Coelho
; Palmieri, Deborah Louize da Rocha Vianna
; Jardim, Amanda Cristina Mendes
; Vianna, Diego Sarty
; Coutinho, Joaquim Henrique de Souza Aguiar
; Jazbik, João Carlos
; Coutinho, Henrique Madureira da Rocha
; Kikuta, Gustavo
; Almeida, Zely Sant'Anna Marotti de
; Feguri, Gibran Roder
; Lima, Paulo Ruiz Lucio de
; Franco, Anna Carolina
; Borges, Danilo de Cerqueira
; Cruz, Felipe Ramos Honorato De La
; Croti, Ulisses Alexandre
; Borim, Bruna Cury
; Marchi, Carlos Henrique De
; Goraieb, Lilian
; Postigo, Karolyne Barroca Sanches
; Jucá, Fabiano Gonçalves
; Oliveira, Fátima Rosane de Almeida
; Souza, Rafael Bezerra de
; Zilli, Alexandre Cabral
; Mas, Raul Gaston Sanchez
; Bettiati Junior, Luiz Carlos
; Tranchesi, Ricardo
; Bertini Jr, Ayrton
; Franco, Leandro Vieira
; Fernandes, Priscila
; Oliveira, Fabiana
; Moraes Jr, Roberto
; Araújo, Thiago Cavalcanti Vila Nova de
; Braga, Otávio Penna
; Pedrosa Sobrinho, Antônio Cavalcanti
; Teixeira, Roberta Tavares Barreto
; Camboim, Irla Lavor Lucena
; Gomes, Eduardo Nascimento
; Reis, Pedro Horigushi
; Garcia, Luara Piovan
; Scorsioni, Nelson Henrique Goes
; Lago, Roberto
; Guizilini, Solange
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Brazilian Journal of Cardiovascular Surgery
- Métricas do periódico
Abstract Introduction: We investigated the clinical course and outcomes of patients submitted to cardiovascular surgery in Brazil and who had developed symptoms/signs of coronavirus disease 2019 (COVID-19) in the perioperative period. Methods: A retrospective multicenter study including 104 patients who were allocated in three groups according to time of positive real time reverse transcriptase-polymerase chain reaction (RT-PCR) for the SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2): group 1, patients who underwent cardiac surgery > 10 days after positive RT-PCR; group 2, patients with a positive RT-PCR within 10 days before or after surgery; group 3, patients who presented positive RT-PCR > 10 days after surgery. The primary outcome was mortality and secondary outcomes were postoperative complications, intensive care unit (ICU) length of stay, and postoperative days of hospitalization. Results: The three groups were similar with respect to age, the European System of Cardiac Operative Risk Evaluation score, and comorbidities, except hypertension. Postoperative complications and death were significantly higher in groups 2 and 3 than in group 1, and no significant difference between groups 2 and 3 was seen. Group 2 showed a high prevalence of surgery performed as an urgent procedure. Although no significant differences were observed in ICU length of stay, total postoperative hospitalization time was significantly higher in group 3 than in groups 1 and 2. Conclusion: COVID-19 affecting the postoperative period of patients who underwent cardiovascular surgery is associated with a higher rate of morbidity and mortality. Delaying procedures in RT-PCR-positive patients may help reduce risks of perioperative complications and death.
4.
Chemical Constituents and Cytotoxic Activity of Rhinella jimi (Anura: Bufonidae)
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Monção Filho, Evaldo S.
; Pio, Yara P. F.
; Chaves, Mariana H.
; Ferreira, Paulo M. P.
; Fonseca, Mariluce G.
; Pessoa, Cláudia
; Lima, Daisy J. B.
; Araújo, Bruno Q.
; Vieira Jr., Gerardo M.
.
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Journal of the Brazilian Chemical Society
- Métricas do periódico
Rhinella jimi toads (Stevaux, 2002) belong to the Bufonidae family, are endemic in the Brazilian Northeast and are commonly found during rainy periods. In general, amphibians of this family have in their poisons different metabolites that show a diversity of pharmacological activities. The isolation and identification of these compounds are of great importance, and techniques such as high-performance liquid chromatography coupled to mass spectrometry are widely used for the discovery of novel and known compounds in these poisons. For R. jimi poison, the ethyl acetate and methanolic extracts were obtained and thirty compounds were identified by combining ultra-performance liquid chromatography coupled to mass spectrometry (UPLC-MS) with direct infusion atmospheric pressure chemical ionization mass spectrometry (DI-APCI-MS/MS) and direct infusion electrospray mass spectrometry (DI-ESI-MS/MS) for each extract, respectively. Marinobufagin (2) and marinobufotoxin (19) were the majorities of each extract, respectively. In addition, other bufadienolides mainly present in the ethyl acetate extract, such other bufotoxins, alkaloids and arginine diacid derivatives were identified in the methanol extract. In a cytotoxic assay by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT), the extracts and compound 2 demonstrated half-maximal inhibitory concentration (IC50) values better than the positive control doxorubicin, evidencing excellent cytotoxic. This is the most complete study of the chemical composition of R. jimi toad poison and its respective cytotoxic activity, promoting the enrichment of knowledge about this family and species.
https://doi.org/10.21577/0103-5053.20210009
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5.
Analysis of the global second-order effects on irregular reinforced concrete structures using the natural period of vibration
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Revista IBRACON de Estruturas e Materiais
- Métricas do periódico
Resumo O parâmetro χT, recentemente apresentado na literatura técnica, permite utilizar o período natural de vibração da estrutura para estimar os efeitos globais de segunda ordem em pórticos de concreto armado. Esse parâmetro foi desenvolvido a partir da observação de que os efeitos de segunda ordem e o período natural de vibração dependem essencialmente da matriz de massa e rigidez da estrutura, estando, portanto, relacionados. Neste trabalho são realizadas análises numéricas em nove modelos de geometrias com diferentes padrões de irregularidades em planta e em termos de rigidez, com o intuito de avaliar a aplicabilidade do parâmetro χT em estruturas que possuem geometrias assimétricas e que possam apresentar modo fundamental de vibração do tipo torcional. Além disso, diferentes hipóteses são testadas para utilização desse parâmetro com o propósito de verificar a influência dos diferentes modos de vibração das estruturas na sensibilidade aos efeitos globais de segunda ordem. Os resultados das análises simplificadas foram comparados aos valores de momentos finais obtidos através de analises numéricas não lineares, considerando o efeito P-Δ. Observa-se que o parâmetro χT apresenta-se como um promissor indicativo para estimativa dos efeitos globais de segunda ordem, principalmente quando os seus modos de vibração superiores são levados em consideração na análise.
Abstract The χT parameter, a simplified method recently presented, allows to estimate the global second-order effects on reinforced concrete frames using the natural period of vibration. This parameter was developed based on the fact that both natural period of vibration and global second-order effects depend essentially on the stiffness and mass matrices of the structure, being thus related. In this paper, numerical analyses are conducted on nine models with different patterns of irregularity in terms of geometry in plan and stiffness. The main purpose of these analyses is to evaluate the applicability of the χT parameter in asymmetric structures as well as that can present torsional modes as the fundamental mode of vibration. In addition, different hypotheses are tested in order to verify the influence of the different modes of vibration in the structural sensitivity to global second-order effects. Results of the simplified analyses were compared to the final bending moment values obtained through a nonlinear numerical analysis considering the P-Δ effect. It is observed that the parameter χT is a promising indicator for a simplified estimation of the global second-order effects for concrete frames, especially when higher modes of vibration are taken account in the analysis.
https://doi.org/10.1590/s1983-41952019000200012
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6.
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
; Agra, Maria F.
; 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
; Andrade, Ivanilza M.
; Andreata, Regina H.P.
; Andrino, Caroline O.
; Anunciação, Elisete A.
; Aona, Lidyanne Y.S.
; Aranguren, Yani
; Aranha Filho, João L.M.
; Araújo, Andrea O.
; Araújo, Ariclenes A.M.
; Araújo, Diogo
; Arbo, María M.
; Assis, Leandro
; Assis, Marta C.
; Assunção, Vivian A.
; Athiê-Souza, Sarah M.
; Azevedo, Cecilia O.
; Baitello, João B.
; Barberena, Felipe F.V.A.
; Barbosa, Maria R.V.
; Barros, Fábio
; Barros, Lucas A.V.
; Barros, Michel J.F.
; Baumgratz, José F.A.
; Bernacci, Luis C.
; Berry, Paul E.
; Bigio, Narcísio C.
; Biral, Leonardo
; Bittrich, Volker
; Borges, Rafael A.X.
; Bortoluzzi, Roseli L.C.
; Bove, Cláudia P.
; Bovini, Massimo G.
; Braga, João M.A.
; Braz, Denise M.
; Bringel Jr., João B.A.
; Bruniera, Carla P.
; Buturi, Camila V.
; Cabral, Elza
; Cabral, Fernanda N.
; Caddah, Mayara K.
; Caires, Claudenir S.
; Calazans, Luana S.B.
; Calió, Maria F.
; Camargo, Rodrigo A.
; Campbell, Lisa
; Canto-Dorow, Thais S.
; Carauta, Jorge P.P.
; Cardiel, José M.
; Cardoso, Domingos B.O.S.
; Cardoso, Leandro J.T.
; Carneiro, Camila R.
; Carneiro, Cláudia E.
; Carneiro-Torres, Daniela S.
; Carrijo, Tatiana T.
; Caruzo, Maria B.R.
; Carvalho, Maria L.S.
; Carvalho-Silva, Micheline
; Castello, Ana C.D.
; Cavalheiro, Larissa
; Cervi, Armando C.
; Chacon, Roberta G.
; Chautems, Alain
; Chiavegatto, Berenice
; Chukr, Nádia S.
; Coelho, Alexa A.O.P.
; Coelho, Marcus A.N.
; Coelho, Rubens L.G.
; Cordeiro, Inês
; Cordula, Elizabeth
; Cornejo, Xavier
; Côrtes, Ana L.A.
; Costa, Andrea F.
; Costa, Fabiane N.
; Costa, Jorge A.S.
; Costa, Leila C.
; Costa-e-Silva, Maria B.
; Costa-Lima, James L.
; Cota, Maria R.C.
; Couto, Ricardo S.
; Daly, Douglas C.
; De Stefano, Rodrigo D.
; De Toni, Karen
; Dematteis, Massimiliano
; Dettke, Greta A.
; Di Maio, Fernando R.
; Dórea, Marcos C.
; Duarte, Marília C.
; Dutilh, Julie H.A.
; Dutra, Valquíria F.
; Echternacht, Lívia
; Eggers, Lilian
; Esteves, Gerleni
; Ezcurra, Cecilia
; Falcão Junior, Marcus J.A.
; Feres, Fabíola
; Fernandes, José M.
; Ferreira, D.M.C.
; Ferreira, Fabrício M.
; Ferreira, Gabriel E.
; Ferreira, Priscila P.A.
; Ferreira, Silvana C.
; Ferrucci, Maria S.
; Fiaschi, Pedro
; Filgueiras, Tarciso S.
; Firens, Marcela
; Flores, Andreia S.
; Forero, Enrique
; Forster, Wellington
; Fortuna-Perez, Ana P.
; Fortunato, Reneé H.
; Fraga, Cléudio N.
; França, Flávio
; Francener, Augusto
; Freitas, Joelcio
; Freitas, Maria F.
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; Furtado, Samyra G.
; Gaglioti, André L.
; Garcia, Flávia C.P.
; Germano Filho, Pedro
; Giacomin, Leandro
; Gil, André S.B.
; Giulietti, Ana M.
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; Goldenberg, Renato
; Gomes da Costa, Géssica A.
; Gomes, Mário
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; Gutierrez, Raul
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; Hattori, Eric K.O.
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; Wanderley, Maria G.L.
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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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7.
Comparisons between two wavelet functions in extracting coherent structures from solar wind time series
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Nowadays, wavelet analysis of turbulent flows have become increasingly popular. However, the study of geometric characteristics from wavelet functions is still poorly explored. In this work we compare the performance of two wavelet functions in extracting the coherent structures from solar wind velocity time series. The data series are from years 1996 to 2002 (except 1998 and 1999). The wavelet algorithm decomposes the annual time-series in two components: the coherent part and non-coherent one, using the daubechies-4 and haar wavelet function. The threshold assumed is based on a percentage of maximum variance found in each dyadic scale. After the extracting procedure, we applied the power spectral density on the original time series and coherent time series to obtain spectral indices. The results from spectral indices show higher values for the coherent part obtained by daubechies-4 than those obtained by the haar wavelet function. Using the kurtosis statistical parameter, on coherent and non-coherent time series, it was possible to conjecture that the differences found between two wavelet functions may be associated with their geometric forms.
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8.
Platynota rostrana (Walker) (Tortricidae) and Phidotricha erigens Raganot (Pyralidae): artificial diet effects on biological cycle
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Nava, D. E.
; Fortes, P.
; de Oliveira, D. G.
; Vieira, F. T.
; Ibelli, T. M.
; Guedes, J. V. C.
; Parra, J. R. P.
.
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Os lepidópteros Platynota rostrana (Walker) (Tortricidae) e Phidotricha erigens Raganot (Pyralidae) têm sido constatados com freqüência nos pomares cítricos do Estado de São Paulo, nos últimos anos. O objetivo deste trabalho foi estudar a biologia das duas espécies, em condições de laboratório (temperatura 25 ± 2 °C, UR. 70 ± 10% e fotofase de 14 h) em dieta artificial, elaborar uma tabela de vida de fertilidade e descrever os danos causados no campo, devido ao desconhecimento destes aspectos biológicos dos referidos insetos no Brasil. A duração do ciclo biológico (ovo-adulto) de P. rostrana foi de 38,3 dias e a viabilidade total de 44,0%, enquanto para P. erigens foi de 32,5 dias e 63,6%, respectivamente. Ambas as espécies apresentaram cinco ínstares e as pupas de fêmeas foram mais pesadas do que as de machos. As fêmeas de P. rostrana colocaram, em média, 308 ovos e as de P. erigens 106 ovos. A longevidade de machos e fêmeas das duas espécies foi próxima de 10 dias. Pela tabela de vida de fertilidade concluiu-se que P. rostrana tem melhor desempenho em dieta artificial que P. erigens. É possível criar estas espécies em dieta artificial, facilitando o desenvolvimento de pesquisas relacionadas ao seu controle por métodos alternativos, caso elas assumam o status de pragas nos pomares de São Paulo.
The lepidopterans Platynota rostrana (Walker) (Tortricidae) and Phidotricha erigens Raganot (Pyralidae) have been found frequently in citrus groves in São Paulo State in recent years. Since in Brazil, the fertility cycle of these two species is largely unknown, as are details of the damage wrought by them in crops, this research studied these aspects of the two species, which were kept under laboratory conditions (temperature 25 ± 2 °C, 70 ± 10% RH, 14 h photophase) and on an artificial diet. The duration of the biological cycle (egg-adult) for P. rostrana was 38.3 days and total viability was 44.0%; for P. erigens these values were 32.5 days and 63.6%, respectively. Both species showed five larval instars. Females of P. rostrana laid an average of 308 eggs, whereas those of P. erigens laid an average of 106 eggs. In both species, female pupae were heavier than males. Male and female longevity for both species was nearly 10 days. Based on the data obtained, the artificial diet produced better results in P. rostrana than in P. erigens. If these species, which have the potential to reach pest status in the citrus groves of São Paulo State, could be reared on an artificial diet, research on their control by alternative methods would be easier.
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9.
Inhibition of the symbiotic fungus of leaf-cutting ants by coumarins
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Godoy, Marizete F. P.
; Victor, Sandra R.
; Bellini, Adriana M.
; Guerreiro, Gisleine
; Rocha, Waldireny C.
; Bueno, Odair C.
; Hebling, Maria J. A.
; Bacci Jr, Maurício
; Silva, M. Fátima G. F. da
; Vieira, Paulo C.
; Fernandes, João B.
; Pagnocca, Fernando C.
.
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Journal of the Brazilian Chemical Society
- Métricas do periódico
Formigas cortadoras de folhas são consideradas pragas para a agricultura devido à grande quantidade de material vegetal utilizado por elas para cultivar um fungo simbionte que lhes serve de alimento e enzimas. O mutualismo entre o fungo e as formigas é um ponto a ser explorado quando se considera sua possível aplicação em métodos alternativos para o controle desses insetos. Sabendo-se que algumas plantas são naturalmente resistentes aos insetos fitófagos, alguns produtos naturais (metabólitos secundários) devem ser avaliados em relação às suas propriedades inseticidas e/ou fungicidas. Neste trabalho foram isoladas oito cumarinas de quatro espécies de plantas e o efeito no desenvolvimento do fungo simbionte das formigas cortadeiras Atta sexdens foi determinado. Com exceção da clausarina, todas as outras cumarinas foram inibitórias de 64 µg mL-1 à 80 µg mL-1 sendo que a xantiletina inibiu o fungo na concentração de 25 µg mL-1.
Leaf-cutting ants are known to be a serious pest for agriculture due to the high amounts of vegetal matter from crops used by them in order to cultivate a symbiotic fungus on which they rely for food and enzymes. The mutualism between the fungus and the ants is a point to be explored when alternative methods of control are being thought of. Considering that some plants are naturally resistant to phytophagous insects, some natural products (secondary metabolites) should be evaluated with respect to their insecticide and/or fungicide properties. In this paper we isolated eight coumarins from four different plant species and we determined their effect on the development of the symbiotic fungus of the leaf-cutting ant Atta sexdens. With the exception of clausarin, all the other coumarins were inhibitory from 64 µg mL-1 through 80 µg mL-1 and xanthyletin inhibited the fungus at 25 µg mL-1
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10.
Identificação sorológica de espécies de potyvirus em melancia, no estado de Roraima
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Halfeld-Vieira, Bernardo A.
; Ramos, Najara F.
; Rabelo Filho, Francisco A.C.
; Gonçalves, M. Fátima B.
; Nechet, Katia L.
; Pereira, Paulo R.V.S.
; Lima, J. Albersio A.
.
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No período de maio de 2003 a março de 2004, foram coletadas amostras foliares de plantas de melancia (Citrullus lanatus) de 21 campos de cultivo de cucurbitáceas, no Estado de Roraima. As amostras exibiam diferentes sintomas de vírus e foram levadas para o Laboratório de Virologia Vegetal da Universidade Federal do Ceará para serem testadas por "enzyme linked immunosorbent assay" (Elisa)-indireto, contra anti-soros específicos para Cucumber mosaic virus (CMV), Papaya ringspot virus estirpe melancia (PRSV-W), Watermelon mosaic virus (WMV) e Zucchini yellow mosaic virus (ZYMV). Nos testes de Elisa, utilizou-se o conjugado universal, anti-imunoglobulina (IgG) de coelho produzida em cabra conjugada à enzima fosfatase alcalina. Todas as amostras foram testadas, também, por dupla difusão contra o anti-soro para Squash mosaic virus (SqMV). Os resultados indicaram a presença do PRSV-W em 84,2% das amostras coletadas em maio de 2003, em 7,1% das amostras coletadas em dezembro de 2003 e em 55,6% das amostras coletadas em março de 2004. A presença do ZYMV foi observada em 10,5% das amostras coletadas em maio de 2003, 21,4% das amostras coletadas em dezembro de 2003 e em 25,9% das amostras de março de 2004. O WMV foi detectado somente em oito das amostras coletadas em março de 2004 (29,6%). Os resultados desta pesquisa confirmam a ampla dispersão do PRSV-W em cultivos de cucurbitáceas no território brasileiro e a preocupante expansão do ZYMV em razão dos elevados prejuízos que o mesmo tem causado em outras partes do mundo.
Leaf samples were collected from watermelon plants (Citrullus lanatus) from 21 different fields in the state of Roraima from May/2003 to March/2004. The samples were sent to the Plant Virus Laboratory of the Federal University of Ceará, to be tested by indirect enzyme linked immunosorbent assay (Elisa) against antisera specific to Cucumber mosaic virus (CMV), Papaya ringspot virus strain watermelon (PRSV-W), Watermelon mosaic virus (WMV) and Zucchini yellow mosaic virus (ZYMV). The Elisa tests were processed using the universal conjugate, anti-imunoglobulim (IgG) from rabbit produced in goat, conjugated to alkaline phosphatase. All samples were also tested by double immunodifusion against antiserum specific to Squash mosaic virus (SqMV). The presence of PRSV-W was detected in 84.2% of the samples collected in May/2003, in 7.1% of the samples collected in December/2003 and 55,6% in March/2004. The presence of ZYMV was detected in 10.5% of the samples collected in May, in 21.4% in December/2003 and in 25.9% in March/2004. The WMV was detected only in eight of the samples collected in March/2004 (29.6%). These results confirm the world widespread dispersion of PRSV-W in cultivated cucurbit fields in Brazil and rise a concern about the ZYMV expansion, which has caused serious yield lost in other parts of the world.
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11.
Enzymatic inhibition studies of selected flavonoids and chemosystematic significance of polymethoxylated flavonoids and quinoline alkaloids in Neoraputia (Rutaceae)
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Moraes, Valéria R. de S.
; Tomazela, Daniela M.
; Ferracin, Ricardo J.
; Garcia, Cleverson F.
; Sannomiya, Míriam
; Soriano, M. del Pilar C.
; Silva, M. Fátima das G. F. da
; Vieira, Paulo C.
; Fernandes, João B.
; Rodrigues Filho, Edson
; Magalhães, Eva G.
; Magalhães, Aderbal F.
; Pimenta, Eli F.
; Souza, Dulce H. F. de
; Oliva, Glaucius
.
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Journal of the Brazilian Chemical Society
- Métricas do periódico
Nosso interesse quimiotaxonômico sobre Neoraputia nos estimulou a examinar N. paraensis, visando a busca de alcalóides. As frações foram monitoradas via RMN ¹H e ESI-EM/EM e foram analisadas somente aquelas cujos espectros apresentavam características de alcalóides do ácido antranílico e flavonóides não isolados anteriormente. Foram isolados do caule os alcalóides flindersina, skimmianina, 8-metoxiflindersina e dictamnina; das folhas os flavonóides 3',4',7,8-tetrametoxi-5,6-(2",2"-dimetilpirano)-flavona, 3',4',5,7,8-pentametoxiflavona, 5-hidroxi-3',4',6,7-tetrametoxiflavona, 3',4'-metilenodioxi-5,6,7-trimetoxiflavona e 5-hidroxi-3',4'-metilenodioxi-6,7-dimetoxiflavona,. Os alcalóides do ácido antranílico não foram encontrados em dez anos. Vários flavonóides isolados de N. paraensis, N. magnifica, Murraya paniculata, enxerto de Citrus sinensis (Rutaceae) e Lonchocarpus montanus (Leguminosae) foram testados frente a gliceraldeído-3-fosfato desidrogenase de Trypanosoma cruzi, visando verificar seus potenciais em inibir a atividade da enzima. Os flavonóides polimetoxilados e um isoflavonóide foram os mais ativos.
Our taxonomic interest in the Neoraputia stimulated an investigation of N. paraensis searching for alkaloids. Fractions were monitored by ¹H NMR and ESI-MS/MS and only those which showed features of anthranilate alkaloids and flavonoids absent in the previous investigations were examined. Stems afforded the alkaloids flindersine, skimmianine, 8-methoxyflindersine and dictamnine; leaves yielded 3',4',7,8-tetramethoxy-5,6-(2",2"-dimethylpyrano)-flavone, 3',4',5,7,8-pentamethoxyflavone, 5-hydroxy-3',4',6,7-tetramethoxyflavone, 3',4'-methylenedioxy-5,6,7-trimethoxyflavone and 5-hydroxy-3',4'-methylenedioxy-6,7-dimethoxyflavone. The alkaloids have remained undiscovered for 10 years. A number of flavonoids isolated from N. paraensis, N. magnifica, Murraya paniculata, Citrus sinensis graft (Rutaceae), Lonchocarpus montanus (Leguminosae) were evaluated for their ability to inhibit the enzymatic activity of the protein glyceraldehyde-3-phosphate dehydrogenase from Trypanosoma cruzi. Highly oxygenated flavones and isoflavone were the most actives.
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12.
Triterpene benzoates from the bark of Picramnia teapensis (Simaroubaceae)
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Rodríguez-Gamboa, Tatiana
; Fernandes, João B.
; Rodrigues Filho, Edson
; Silva, M. Fátima das G. F. da
; Vieira, Paulo C.
; Barrios Ch., Mariano
; Castro-Castillo, Oscar
; Victor, Sandra R.
; Pagnocca, Fernando C.
; Bueno, Odair C.
; Hebling, Maria J. A.
.
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Journal of the Brazilian Chemical Society
- Métricas do periódico
Da casca do caule de Picramnia teapensis Tul. foram isolados dois novos benzoatos triterpênicos, o 3alfa,7beta-dibenzoato do ácido lup-20(29)-en-28-óico e o 7beta-benzoato do ácido 3alfa-hidroxi-lup-20(29)-en-28-óico. A elucidação estrutural desses compostos foi fundamentada na análise dos dados espectroscópicos. Outros compostos conhecidos, beta-sitosterol, estigmasterol, lupeol e epilupeol, foram identificados em mistura por CG-EM. Nenhum dos triterpenos benzoilados mostrou efeito inibitório no crescimento in-vitro do Leucoagaricus gongylophorus (Fisher), também citado como Leucocoprinus gongylophorus (Heim), syn Rozites gongylophora (Möller), o fungo simbionte cultivado pelas formigas cortadeiras de folhas Atta sexdens L.
Two new benzoic acid esters of triterpene alcohols [lup-20(29)-en-28-oic acid 3alpha,7beta-dibenzoate and 3alpha-hydroxy-lup-20(29)-en-28-oic acid 7beta-benzoate] were isolated from the stem bark of Picramnia teapensis Tul. The structures of these compounds were established on the basis of spectral analyses. Other known compounds, beta-sitosterol, estigmasterol, lupeol and epilupeol, were identified in mixture by GC-MS. The triterpene esters have not shown in-vitro inhibitory effect on the growth of Leucoagaricus gongylophorus (Fisher), referred also as Leucocoprinus gongylophorus (Heim), syn Rozites gongylophora (Möller), the symbiotic fungus cultivated by the leaf-cutting ant Atta sexdens L.
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13.
Clinical patterns and seasonal trends in respiratory syncytial virus hospitalizations in São Paulo, Brazil
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VIEIRA, Sandra E.
; STEWIEN, Klaus E.
; QUEIROZ, Divina A. O.
; DURIGON, Edison L.
; TÖRÖK, Thomas J.
; ANDERSON, Larry J.
; MIYAO, Cristina R.
; HEIN, Noely
; BOTOSSO, Viviane F.
; PAHL, Márcia M.
; GILIO, Alfredo E.
; EJZENBERG, Bernardo
; OKAY, Yassuhiko
.
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Revista do Instituto de Medicina Tropical de São Paulo
- Métricas do periódico
Os vírus respiratórios são reconhecidos como os mais frequentes patógenos do trato respiratório inferior para lactentes e crianças de idade reduzida em países desenvolvidos, mas o conhecimento sobre este fato é menor nos países em desenvolvimento.Os autores realizaram um estudo prospectivo para avaliar a ocorrência, os padrões clínicos e a sazonalidade das infecções virais entre as crianças hospitalizadas com doença do trato respiratório inferior (grupo A). A presença de vírus respiratórios na nasofaringe das crianças foi avaliada à admissão em uma enfermaria de pediatria. A cultura celular e a imunofluorescência foram utilizadas para identificação viral. Exames complementares incluiram culturas de sangue e líquido pleural para detecção de bactérias. Dados clínicos e exames radiológicos foram anotados na admissão e durante o período de internação. Para avaliar adequadamente os resultados foi constituído um grupo sem doença respiratória para comparação. Com início em fevereiro de 1995, durante um período de 18 meses, 414 crianças foram incluídas - 239 no grupo A e 175 no grupo B. No grupo A, 111 crianças (46,4%) tinham vírus enquanto somente 5 (2,9%) apresentavam vírus no grupo B. O Vírus Respiratório Sincicial foi detectado em 100 crianças do grupo A (41,8%), o Adenovírus em 11 (4,6%), o vírus Influenza em 2 (0,8%), e o Parainfluenza em uma criança (0,4%). No grupo A as bactérias foram encontradas em 14 casos (5,8%). O Vírus Respiratório Sincicial estava associado a outro vírus ou bactéria em seis casos. Ocorreram dois surtos de Vírus Respiratório Sincicial, com pico em maio e junho. Todas as crianças acometidas por este vírus tinham idade inferior a 3 anos, na sua maior parte menos de um ano de idade. O acometimento bronquial episódico e difuso e/ou a condensação alveolar focal, foram os padrões clínicos mais frequentemente associados aos casos de infecção pelo Vírus Respiratório Sincicial. Todas as crianças do grupo A sobreviveram. Em conclusão, foi observado que o Vírus Respiratório Sincicial foi o patógeno mais frequentemente encontrado em crianças hospitalizadas por doença respiratória grave. As crianças afetadas eram predominantemente lactentes do sexo masculino com bronquiolite e pneumonias focais. De modo similar ao que ocorre em outras regiões subtropicais os surtos do vírus têm pico no outono, extendem-se ao inverno, e se acompanham de um aumento nas internações hospitalares por doença respiratória.
The respiratory viruses are recognized as the most frequent lower respiratory tract pathogens for infants and young children in developed countries but less is known for developing populations. The authors conducted a prospective study to evaluate the occurrence, clinical patterns, and seasonal trends of viral infections among hospitalized children with lower respiratory tract disease (Group A). The presence of respiratory viruses in children's nasopharyngeal was assessed at admission in a pediatric ward. Cell cultures and immunofluorescence assays were used for viral identification. Complementary tests included blood and pleural cultures conducted for bacterial investigation. Clinical data and radiological exams were recorded at admission and throughout the hospitalization period. To better evaluate the results, a non- respiratory group of patients (Group B) was also constituted for comparison. Starting in February 1995, during a period of 18 months, 414 children were included- 239 in Group A and 175 in Group B. In Group A, 111 children (46.4%) had 114 viruses detected while only 5 children (2.9%) presented viruses in Group B. Respiratory Syncytial Virus was detected in 100 children from Group A (41.8%), Adenovirus in 11 (4.6%), Influenza A virus in 2 (0.8%), and Parainfluenza virus in one child (0.4%). In Group A, aerobic bacteria were found in 14 cases (5.8%). Respiratory Syncytial Virus was associated to other viruses and/or bacteria in six cases. There were two seasonal trends for Respiratory Syncytial Virus cases, which peaked in May and June. All children affected by the virus were younger than 3 years of age, mostly less than one year old. Episodic diffuse bronchial commitment and/or focal alveolar condensation were the clinical patterns more often associated to Respiratory Syncytial Virus cases. All children from Group A survived. In conclusion, it was observed that Respiratory Syncytial Virus was the most frequent pathogen found in hospitalized children admitted for severe respiratory diseases. Affected children were predominantly infants and boys presenting bronchiolitis and focal pneumonias. Similarly to what occurs in other subtropical regions, the virus outbreaks peak in the fall and their occurrence extends to the winter, which parallels an increase in hospital admissions due to respiratory diseases.
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