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Search Results: 1 - 10 of 60036 matches for " Leandro Silva Barbosa "
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Occurrence of Temnocephala (Platyhelminthes: Temnocephalida) in Immatures of Kempnyia reticulata (Enderlein) (Insecta: Plecoptera: Perlidae) Primeiro Registro de Temnocephala (Platyhelminthes: Temnocephalida) em Imaturos de Kempnyia reticulata (Enderlein) (Plecoptera: Perlidae)
Fernanda Avelino-Capistrano,Leandro Silva Barbosa
EntomoBrasilis , 2013, DOI: 10.12741/ebrasilis.v6i1.226
Abstract: First register of Temnocephala (Platyhelminthes: Temnocephalida) in immature of Kempnyia reticulata (Enderlein) (Plecoptera: Perlidae). The insects were collected in rivers of Esta o Biológica de Santa Lúcia, Santa Teresa, Espirito Santo, Brazil. Primeiro registro de Temnocephala (Platyhelminthes: Temnocephalida) em imaturos de Kempnyia reticulata (Enderlein) (Plecoptera: Perlidae). Os insetos foram coletados em um riacho da Esta o Biológica de Santa Lúcia, Santa Teresa, Espírito Santo, Brasil.
Evaluation of Different Parasitological Techniques for Diagnosing Intestinal Parasites in Dogs  [PDF]
Breno Barros de Santana, Tallys Leandro Barbosa da Silva, Rafael Antonio Nascimento Ramos, Leucio Camara Alves, Gílcia Aparecida de Carvalho
Open Journal of Veterinary Medicine (OJVM) , 2015, DOI: 10.4236/ojvm.2015.52003
Abstract: Intestinal nematodes are among the most common parasites of dogs, being Toxocara spp. and Ancylostoma spp. threats to public health due to their zoonotic potential. In this study, three parasitological diagnostic techniques for detecting the eggs/oocysts of canine intestinal parasites were evaluated. Fecal samples (n = 285) were collected from the environment (i.e. public streets, squares and homes) in Garanhuns, Pernambuco, Brazil. Samples were analyzed using the Willis-Mollay simple flotation technique, spontaneous sedimentation (Hoffman, Pons and Janer) and modified centrifugal flotation. Among the samples analyzed, 56.49% (161/285) showed eggs and/or oocysts of intestinal parasites. In particular, 44.21% (126/285) were detected by the Willis technique, 45.14% (121/268) by centrifugal flotation and 31.57% (90/285) by the Hoffmann technique. The kappa index indicated good concordance between the centrifugal flotation and Willis techniques (κ = 0.625), whereas fair concordance was observed between Hoffmann and Willis (κ = 0.480), and between Hoffman and centrifugal flotation (κ = 0.433). In conclusion, the centrifugal flotation technique showed high sensitivity towards detecting Ancylostoma spp. and Toxocara spp. (the most common parasites in this study) and could be used in association with the Willis technique to obtain safe diagnoses within routine laboratory analysis.
Desenvolvimento de Nasonia vitripennis (Walker, 1836) (Hymenoptera: Pteromalidae) em pupas de Cochliomyia macellaria (Fabricius, 1775) (Diptera: Calliphoridae), utilizando diferentes densidades do parasitóide
Barbosa, Leandro Silva;Couri, Márcia Souto;Coelho, Valéria Magalh?es Aguiar;
Biota Neotropica , 2008, DOI: 10.1590/S1676-06032008000100005
Abstract: the post-embryonic development, the productivity of the pupae, the rate of parasitism and the sexual ratio of nasonia vitripennis (walker) reared in pupae of cochliomyia macellaria (fabricius) were studied. different densities of the parasitoid were used (proportions 1:1, 2:1, 3:1, 4:1, and 5:1) with exposition of 72 hours. nulliparous females originating from the stock colony were individualized in test tubes covered with hydrophobic cotton and containing the host pupae. each treatment was constituted by 10 repetitions. after the exposition, the wasps were discarded and the host pupae were individualized in test tubes until the emergency of the adults of c. macellaria or n. vitripennis. samples of host pupae not exposed to parasitism and receiving the same experimental treatment were used as control. the post-embryonic period was significantly shorter in the proportion of 2:1 (13,73 days) and longer in the relation of 5:1. the peaks of emergence occurred in the 14th day after the exposition of the parasitoid to the host in all relations, except for the relation of 4:1(13rd day). the productivity of n. vitripennis does not vary significantly among the different proportions. as the number of parasitoids grows, its post-embryonic development gets slower and the sexual ratio of males grows up. the rate of parasitism showed a decrease when the host was exposed to five parasitoids.
Desempenho do parasitóide Nasonia vitripennis (Walker)(Hymenoptera, Pteromalidae) utilizando como hospedeiro Cochliomyia macellaria (Fabricius) (Diptera, Calliphoridae), sob diferentes tempos de exposi??o
Barbosa, Leandro Silva;Couri, Márcia Souto;Coelho, Valéria Magalh?es Aguiar;
Revista Brasileira de Entomologia , 2010, DOI: 10.1590/S0085-56262010000100017
Abstract: the post-embryonic development, the productivity of the host pupae, the rate of parasitism and the sex ratio of nasonia vitripennis reared in pupae of cochliomyia macellaria were studied. different exposition times were used: 24, 48, 72, 96 hours. nulliparous females originating from the stock colony were individualized in test tubes covered with hydrophobic cotton and containing the host pupae. each treatment was constituted by 10 replicates. after exposition, the hymenopterans were discarded and the host pupae were individualized in test tubes until the emergency of the adults of c. macellaria or n. vitripennis. samples of host pupae not exposed to parasitism and receiving the same experimental treatment, were used as control. the parasitoids showed a slower development in relation to the increase exposition time. the 72 hours exposition was the one which enabled higher productivity. the sex ratio tended towards a deviation for the birth of females after 48 hour. the rate of parasitism increased up to 72 hours. the rate of dipteran's emergence showed a decrease until 72 hours.
RR soybean seed quality after application of glyphosate in different stages of crop development Qualidade das sementes de soja RR após aplica o de glyphosate em diferentes estádios de desenvolvimento da cultura
Leandro Paiola Albrecht,André Prechlak Barbosa,André Felipe Moreira Silva,Matheus Akiyama Mendes
Revista Brasileira de Sementes , 2012, DOI: 10.1590/s0101-31222012000300003
Abstract: In consequence of several studies and speculations concerning the issue of RR transgenic soybean after the application of glyphosate, additional scientific investigations became necessary to clarify the actual viability of the product use when applied in different developmental stages of the soybean crop. Therefore, this study was aimed to evaluate the physiological quality as well as seed health quality of RR soybean subjected to application of the herbicide glyphosate in different phonological stages of the transgenic soybean, cultivar CD 219RR. For this, an experiment with a complete block experimental design with treatments randomly distributed within the block, with four replications, was carried out. The assessed treatments were foliar sprayings of glyphosate in three increasing dosages [0 (control); 1,440 g ha-1; and 2,880 g ha-1] of acid equivalent, applied in two crop developmental stages: vegetative (V6) and reproductive (R2). The variables assessed were: germination; first count of germination; fresh and dry mass of seedlings, lengths of seedling and root; vigor and viability by the tetrazolium test; and seed health quality. Glyphosate application may adversely affect physiological quality of RR soybean seeds, when applied in dosages varying from 1,440 to 2,880 g acid equivalent per hectare at the stages V6 and R2. Em virtude de estudos e especula es envolvendo a quest o da soja transgênica (RR) após a aplica o de glyphosate, se fez necessário a busca de informa es científicas que permitam diagnosticar a real viabilidade do uso do glyphosate aplicado em diferentes estádios fenológicos da cultura. Deste modo, o objetivo deste estudo foi avaliar a qualidade fisiológica e sanitária das sementes de soja RR após a aplica o do herbicida glyphosate na cultura da soja transgênica, cultivar CD 219RR. Para tanto, foi desenvolvido um ensaio em delineamento de blocos completos com tratamentos casualizados, com quatro repeti es, em que os tratamentos avaliados consistiram da pulveriza o foliar contendo glyphosate, em três doses crescentes (0, 1.440 e 2.880 g de equivalente ácido por hectare), aplicados em dois estádios de desenvolvimento da cultura: vegetativo V6 e reprodutivo R2. As variáveis avaliadas foram: germina o; primeira contagem de germina o; massa fresca e seca de plantulas; comprimento de plantulas e raízes; viabilidade e vigor, pelo teste de tetrazólio; e qualidade sanitária das sementes. A aplica o de glyphosate pode afetar negativamente a qualidade fisiológica das sementes de soja, quando aplicado em doses de 1.440 a 2.880 g do equ
Effects of marginal vegetation removal on Odonata communities Efeitos da retirada da vegeta o marginal sobre a comunidade de Odonata
Fernando Geraldo de Carvalho,Nelson Silva Pinto,José Max Barbosa de Oliveira Júnior,Leandro Juen
Acta Limnologica Brasiliensia , 2013,
Abstract: AIM: Here we assess the effects of habitat degradation on individuals of the two suborders of Odonata community of Borecaia river sub-basin. More specifically, we tested the hypothesis that Anisoptera richness would be positively affected by removal of vegetation; on the other hand, Zygoptera richness would be adversely affected by virtue of their ecophysiological requirements; METHODS: We selected 10 streams of similar orders, six preserved and four degraded. Streams characterized as preserved had values of Index of Habitat Integrity (HII) above 0.70 (0.77 ± 0.07, mean ± SD) and continuous forest on both sides with a minimum width of 70 meters. Each site was sampled three times on different days. The effect of vegetation removal on richness was assessed using richness estimated by first order Jackknife; RESULTS: Decreased physical integrity (measured with IIH) of streams had no significant effect on the estimated richness to Odonata in general. However, the estimated richness of Anisoptera showed an inverse relationship with the integrity (r2 = 0.485, P = 0.025), i.e., there was a reduction in their species richness with increasing integrity; DISCUSSION: As a general pattern, Anisoptera presents higher richness in an altered site; on the other hand, Zygoptera presents higher richness in a preserved one. This pattern suggests that Odonata needs to be considered at the sub-order level to access the effects of habitat degradation on these insects. Because of its restrictions ecophysiological Odonata varied widely in their composition and species richness between the two types of environments, it reinforces the potential of the order of studies and environmental monitoring also shows that Zygoptera be more affected by changes in habitat. However, further studies including more samples and different streams are need to confirm this pattern, being an interesting line of research for future works. OBJETIVOS: Com o intuito de avaliar os efeitos de mudan as na integridade ambiental sobre os indivíduos da comunidade de Odonata da sub-bacia do rio Borecaia, testamos a hipótese de que a riqueza de Anisoptera seria afetada positivamente pela remo o da vegeta o; por outro lado, a riqueza Zygoptera seria prejudicada em virtude de suas necessidades ecofisiológicas; MéTODOS: Selecionamos 10 riachos de ordens similares, seis classificados como preservados e quatro como alterados. Riachos classificados como preservados apresentaram valores do índice valores de Integridade Habitat (HII) acima de 0.70 e mata continua nas duas margens com uma largura mínima de 70 metros. C
QUALIDADE MICROBIOLóGICA DE REQUEIJ O E DOCE DE LEITE PASTOSO PRODUZIDOS EM TOCANTINS – MG
Cleuber Raimundo da Silva,Jo?o Batista Barbosa,Fernanda Cristina Firmino,Leandro Lamas Caldoncelli
Perspectivas Online : Biológicas e Saúde , 2011,
Abstract: Curd is a typically Brazilian product, manufactured in the entire national territory, with some variations oftechnology and features. Another product of great importance is the dulce de leche, which production inBrazil is made by many companies, from home to large, distributed throughout the country. These productsare susceptible to contamination by different microorganisms that can cause product deterioration or lead thedevelopment of diseases affecting human health. Among the main microbial contaminants in cheese anddulce de leche, we highlight the Fecal Coliforms 30oC and 45°C, Staphylococcus spp. and filamentousfungi and yeasts. This study aimed to perform monthly, microbiological analysis of the cream cheese anddulce de leche produced by a dairy town of Tocantins – MG, in 2007. According to the results, one canobserve that all samples of cheese and dulce de leche fitted to the standards established by the legislation. Therefore, we conclude that the two products showed good microbiological quality, being in this respect,suitable for marketing and consumption.
Hemilucilia segmentaria (Fabricius, 1805) (Diptera: Calliphoridae) as new biological vector of eggs of Dermatobia hominis (Linnaeus Jr., 1781) (Diptera: Oestridae) in Reserva Biológica do Tinguá, Rio de Janeiro, Brazil
Marinho Clarissa Rezende,Barbosa Leandro Silva,Azevedo Ana Claudia Granthon de,Queiroz Margareth M de Carvalho
Memórias do Instituto Oswaldo Cruz , 2003,
Abstract: The aim of this note was to record for the first time the finding of Hemilucilia segmentaria acting as biological vector of Dermatobia hominis, during a study of the diversity of Calliphoridae at Reserva Biológica do Tinguá, Rio de Janeiro, Brazil. The insects were captured using traps baited with chicken vicera, for a period of 28-30 h twice per month. In the period of one year, 1987 insects were collected, 7.5% of which belonged to the H. segmentaria; of these a female was captured in May 2001, carrying a mass of 20 eggs on the left side of its abdomen.
As Varia es na Comunidade de Odonata (Insecta) em Córregos Podem ser Preditas pelo Paradoxo do Plancton? Explicando a Riqueza de Espécies Pela Variabilidade Ambiental Variations in Odonata (Insecta) Community in Streams may be Predicted by the Plankton Paradox? Explaining Species Richness by Environmental Variability
José Max Barbosa Oliveira Junior,Helena Soares Ramos Cabette,Nelson Silva Pinto,Leandro Juen
EntomoBrasilis , 2013, DOI: 10.12741/ebrasilis.v6i1.250
Abstract: A teoria do Paradoxo do Plancton postula que ambientes que apresentam flutua es temporais periódicas apresentariam alta diversidade de espécie, uma vez que essas flutua es impediriam a ocorrência da exclus o competitiva. Este trabalho teve como objetivo avaliar a varia o da comunidade de Odonata adulto na Bacia do Rio Suiá-Missu, testando a hipótese de que locais que apresentam variáveis ambientais com maiores amplitudes de varia o possuiriam maiores riquezas de espécies. Foram amostrados 11 corpos d′água, em uma área de transi o Cerrado-Floresta Amaz nica na regi o centro-leste do estado de Mato Grosso, Brasil. As variáveis ambientais avaliadas foram integridade ambiental (HII) e amplitude de varia o do pH, condutividade, temperatura do ar, temperatura da água, oxigênio dissolvido, am nia, fósforo e Mg+. Foram coletados 2.144 espécimes, distribuídos em oito famílias, 41 gêneros e 78 espécies. Nossa hipótese n o foi corroborada, uma vez que a regress o múltipla entre a riqueza estimada de espécie de Anisoptera e Zygoptera e a amplitude de varia o dos fatores físico-químicos n o foi significativa para nenhuma das variáveis analisadas, assim como para o HII. Nossos resultados sugerem que as varia es na comunidade de Odonata em córregos n o podem ser explicadas pelo Paradoxo do Plancton. Acreditamos que este resultado pode ter ocorrido principalmente devido às baixas varia es nas condi es ambientais analisadas, a o de outros processos locais, como a competi o e preda o, ou por diferen as ecofisiológicas, resultado da varia o de tamanho corporal e da capacidade de termorregula o dos adultos na ordem estudada. The theory of Plankton Paradox postulates that environments that exhibit regular temporal fluctuations would present a high diversity of species, since such fluctuations would prevent the occurrence of competitive exclusion. This work aimed evaluate variations in adult Odonata community in catchment of River Suiá-Missu, testing the hypothesis that sites with environmental variables with the largest amplitude of variation would present the highest species richness. Were sampled 11 water bodies in an area of transition Cerrado-Amazon Forest in east-central Mato Grosso state, Brazil. Environmental variables evaluated were: environmental integrity (HII) and range of variation of pH, conductivity, air temperature, water temperature, dissolved oxygen, ammonia, phosphorus and Mg+. Were collected 2.144 specimens, distributed in eight families, 41 genera and 78 species. Our hypothesis was not confirmed, since the multiple regression analysis perf
Prevalência da maloclus o e necessidade de tratamento ortod ntico em escolares de 10 a 14 anos de idade em Belo Horizonte, Minas Gerais, Brasil: enfoque psicossocial
Marques Leandro Silva,Barbosa Cristiane Carvalho,Ramos-Jorge Maria Letícia,Pordeus Isabela Almeida
Cadernos de Saúde Pública , 2005,
Abstract: Os objetivos deste estudo transversal foram determinar a prevalência da maloclus o e verificar a associa o entre necessidade normativa de tratamento ortod ntico e determinados aspectos psicossociais. A amostra (n = 333) foi representativa de todos os adolescentes de 10 a 14 anos de idade, residentes em Belo Horizonte, Minas Gerais, Brasil. A variável dependente "necessidade normativa de tratamento ortod ntico" foi avaliada por intermédio do Dental Aesthetic Index (DAI), e as variáveis independentes (gênero, idade, escolaridade da m e, nível econ mico, percep o dos pais quanto à estética bucal e necessidade de tratamento dos filhos e desejo de tratamento pelos adolescentes), mediante questionários. Foram realizadas análises descritiva, univariada e de regress o logística múltipla (Stepwise Forward Procedure), adotando-se o nível de significancia p < 0,05. A prevalência de má-oclus o foi de 62,0% e a necessidade normativa de tratamento ortod ntico de 52,2%. Desejo de tratamento ortod ntico relatado pelo adolescente e percep o dos pais quanto à estética bucal do filho foram variáveis que apresentaram associa o estatisticamente significativa com a necessidade normativa de tratamento ortod ntico. Os resultados sugerem que fatores psicossociais devem ser incorporados aos critérios clínicos considerando a decis o para o tratamento ortod ntico.
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