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Search Results: 1 - 10 of 19698 matches for " Liléia;Faria Filho "
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Aspectos operacionais do controle do Triatoma brasiliensis
Diotaiuti Liléia,Faria Filho Osvaldo F.,Carneiro Francisco C. F.,Dias Jo?o Carlos Pinto
Cadernos de Saúde Pública , 2000,
Abstract: O controle de triatomíneos é dificultado pela capacidade de reinvas o das casas por exemplares silvestres. Entre agosto/96 e dezembro/97 realizou-se, no Ceará, um estudo a respeito da reinfesta o das casas após borrifa o. Das 277 Unidades Domiciliares - UD - pesquisadas, 40,8% estavam infestadas (21,7% dos intradomicílios e 35,4% dos peridomicílios). Dos 433 triatomíneos capturados, 207 eram Triatoma brasiliensis (48,8% no intradomicílio, média de 1,8 insetos/casa) e 226 Triatoma pseudomaculata (97,3% no peridomicílio). Ocorre um único ciclo anual do T. brasiliensis, e dois ciclos anuais do T. pseudomaculata. Quatro meses após a borrifa o, 9,7% das unidades domiciliares permaneciam positivas, principalmente no peridomicílio; 10,3% das UD foram positivas em todas as avalia es. O teste de suscetibilidade biológica à deltametrina revelou a persistência do inseticida no intradomicílio até nove meses após a borrifa o. A prevalência global da infec o humana foi de 5,7%, tendo sido positivas cinco crian as menores de dez anos. Considerando-se a alta press o de recoloniza o a partir de exemplares silvestres, prop e-se, como metodologia de controle, um sistema misto da avalia o tradicional e a vigilancia epidemiológica.
Aspectos operacionais do controle do Triatoma brasiliensis
Diotaiuti, Liléia;Faria Filho, Osvaldo F.;Carneiro, Francisco C. F.;Dias, Jo?o Carlos Pinto;Pires, Herton Helder R.;Schofield, Christopher J.;
Cadernos de Saúde Pública , 2000, DOI: 10.1590/S0102-311X2000000800006
Abstract: vector control strategies against indigenous species is not easy, due to their capacity to reinvade treated premises from sylvatic ecotopes. between august 1996 and december 1997 we conducted a study on reinfestation of houses after spraying in a county in the state of ceará. of 277 houses examined, 113 (40.8%) were infested (21.7% intradomiciliary and 35.4% peridomiciliary). of the 433 triatominae collected, 207 were triatoma brasiliensis (49% of which intradomiciliary, with a mean of 1.8 insects/house) and 226 were triatoma pseudomaculata (97% peridomiciliary). the age structure of the two indicated a univoltine development cycle for t. brasiliensis and two cycles per year for t. pseudomaculata. four months after spraying with deltamethrin sc 25mg ia/m2, 9.7% of the houses were still positive, mainly with peridomestic infestations. intradomiciliary wall bioassays showed persistence of the insecticide up to 9 months after spraying. considering the high potential for recolonization of treated premises from sylvatic foci, we propose an operational strategy combining traditional evaluations and community-based surveillance with increased selective interventions and community education.
Ocorrência e biologia do Rhodnius neglectus Lent, 1954 em macaubeiras da periferia de Belo Horizonte, Minas Gerais
Diotaiuti, Liléia;Dias, Jo?o Carlos Pinto;
Memórias do Instituto Oswaldo Cruz , 1984, DOI: 10.1590/S0074-02761984000300002
Abstract: eighty-one "macaubeiras" palm-trees (acrocomia sclerocarpa) from the periophery of belo horizonte city were cut down and dissected between april 1979 and july 1980. 60,5% of the trees were positive for r. neglectus and 463 specimens of this insect were collected, providing a mean rate of 9,45 individuals for positive palm-trees. r neglectus seems to present a single annual generation in this region, but evidence was obtained that two generations may occur. its spawn period is related to the hot months of the year, when younger insects prevail over the adults. this observation suggests that higher population desities are related to better feeding conditions and to minor desities of specific prefators such as telenomus sp., ants, spiders, hemipters, scorpions and pseudo scorpionidae. the trypanosoma cruzi infection index was 15,9%, suggesting that r. neglectus is a very important vector of silvatic infections in the region. marsupials are the main vertebrate source of t. cruzi infection. r. neglectus is strongly associated with palm-trees in the area, and with the various species of birds that haunt them. so far, there is no evidence suggesting r. neglectus to be an important vector of human chagas' disease in the region.
Comparative developmental and susceptibility to insecticide of Bolivian and Brazilian populations of Triatoma infestans
Pires, Herton Helder Rocha;Barbosa, Silvia Ermelinda;Diotaiuti, Liléia;
Memórias do Instituto Oswaldo Cruz , 2000, DOI: 10.1590/S0074-02762000000600025
Abstract: the triatomine bug triatoma infestans probably originated in bolivia and dispersed passively over wide areas of south america, where it is the principal vector of trypanosoma cruzi. in the region of its probable origin this species shows colonization in two different ecotopes, so that it may be encountered in sylvatic as well as in artificial habitats. the sylvatic colonization pattern is not observed in the rest of its range, where t. infestans is exclusive to man-made habitats. the objective of this study was to compare several aspects of two t. infestans populations, one from minas gerais (brazil) and the other from the cochabamba valley (bolivia), with a view to elucidate the factors associated with the different colonization patterns observed for this species. the differences between the developmental cycle, weight, capacity to ingest blood and mortality rate of first instar nymphs should indicate more fragility of brazilian population that may be related to its elimination possibility.
Uso do Random Amplified Polymorphic DNA (RAPD) no estudo populacional do Triatoma brasiliensis Neiva, 1911
Borges, érika C.;Romanha, Alvaro J.;Diotaiuti, Liléia;
Cadernos de Saúde Pública , 2000, DOI: 10.1590/S0102-311X2000000800012
Abstract: we evaluated the genetic variability of triatoma brasiliensis, the main vector of chagas disease in northeast brazil, using specimens from three populations. regions of genomic dna were amplified by rapd (random amplified polimorphic dna), using two primers. the products were visualized after polyacrylamide gel electrophoresis followed by silver staining. a dendrogram constructed through the dice similarity coefficient allowed for separation of the tested specimens into three distinct groups. the populations captured in areas from ceará state showed similar profiles, but different from that captured in piauí state. our results indicate that rapd can be used successfully in triatomine studies and suggest the presence of genetic variability between different populations of t. brasiliensis.
Comparative developmental and susceptibility to insecticide of Bolivian and Brazilian populations of Triatoma infestans
Pires Herton Helder Rocha,Barbosa Silvia Ermelinda,Diotaiuti Liléia
Memórias do Instituto Oswaldo Cruz , 2000,
Abstract: The triatomine bug Triatoma infestans probably originated in Bolivia and dispersed passively over wide areas of South America, where it is the principal vector of Trypanosoma cruzi. In the region of its probable origin this species shows colonization in two different ecotopes, so that it may be encountered in sylvatic as well as in artificial habitats. The sylvatic colonization pattern is not observed in the rest of its range, where T. infestans is exclusive to man-made habitats. The objective of this study was to compare several aspects of two T. infestans populations, one from Minas Gerais (Brazil) and the other from the Cochabamba Valley (Bolivia), with a view to elucidate the factors associated with the different colonization patterns observed for this species. The differences between the developmental cycle, weight, capacity to ingest blood and mortality rate of first instar nymphs should indicate more fragility of Brazilian population that may be related to its elimination possibility.
Uso do Random Amplified Polymorphic DNA (RAPD) no estudo populacional do Triatoma brasiliensis Neiva, 1911
Borges érika C.,Romanha Alvaro J.,Diotaiuti Liléia
Cadernos de Saúde Pública , 2000,
Abstract: Para o estudo de variabilidade genética em Triatoma brasiliensis, o principal vetor da doen a de Chagas no Nordeste brasileiro, espécimes de três diferentes popula es intradomiciliares foram analisados. Regi es do DNA gen mico foram amplificadas utilizando dois iniciadores rand micos através da técnica de RAPD (Random Amplified Polymorphic DNA), visualizados em géis de poliacrilamida corados pela prata. Os perfis originados se mostraram bastante homogêneos quando comparados intrapopulacionalmente. Popula es capturadas em duas regi es diferentes do Estado do Ceará também apresentaram homogeneidade entre si, mas, quando comparadas com a popula o proveniente do Piauí, foi possível diferenciá-las. Esses resultados, preliminares, indicam que o RAPD pode ser usado com sucesso nos estudos de variabilidade em triatomíneos, bem como sugerem a existência de variabilidade entre diferentes popula es de T. brasiliensis pertencentes a uma mesma subespécie.
Experimental evidence for a demographic cline in Panstrongylus megistus populations
Barbosa, Silvia E;Soares, Rodrigo PP;Pires, Herton HR;Diotaiuti, Liléia;
Memórias do Instituto Oswaldo Cruz , 2001, DOI: 10.1590/S0074-02762001000600005
Abstract: the population biology of three populations of panstrongylus megistus was compared to determine possible influence on the behaviour and epidemiological importance of this species. the results demonstrated differences in terms of egg eclosion time, nymphal mortality and development rates, and feeding and defaecation rates. these differences appeared to follow a geographical cline, primarily reflecting different degrees of adaptation to domestic habitats.
Biological aspects of crosses between Triatoma maculata (Erichson, 1848) and Triatoma pseudomaculata Corrêa & Espínola, 1964 (Hemiptera: Reduviidae)
Belisário, Carlota Josefovicz;Pessoa, Grasielle Caldas D'ávila;Diotaiuti, Liléia;
Memórias do Instituto Oswaldo Cruz , 2007, DOI: 10.1590/S0074-02762007005000029
Abstract: due to morphological similarities between triatoma maculata and t. pseudomaculata, which comprise the "maculate complex", both had been regarded as the same species until 1964. considering that the studies on triatomine hybridization permit hypotheses formulation concerning origin and divergence of species, enabling a quantitative analysis of taxonomic relationships between species, the present investigation was aimed at broadening further understanding related to the capacity of hybrid production by determining the degree of reproductive isolation between t. maculata and t. pseudomaculata. our results have demonstrated that t. maculata and t. pseudomaculata showed no differences regarding reproduction patterns and they are able to cross, generating infertile hybrids.
Evaluation of cultures of Saccharomyces cerevisae as baits for Triatoma dimidiata and Triatoma pallidipennis
Pimenta, Flávio E;Diotaiuti, Liléia;Lima, Anna C Lustosa;Lorenzo, Marcelo G;
Memórias do Instituto Oswaldo Cruz , 2007, DOI: 10.1590/S0074-02762007005000014
Abstract: we tested the attraction of triatoma dimidiata and t. pallidipennis to traps baited with yeast volatiles. two traps were simultaneously presented in opposite sides of an experimental arena. one trap presented a yeast culture in sucrose solution, while the other contained sucrose solution as control. a first experimental series was done without offering a central refuge for bugs. in a second series, one shelter where the insects could hide was offered and the traps were presented afterwards. in the first series, yeast baited traps attracted significantly more insects than control ones for both species. in the second series, t. pallidipennis was significantly attracted to yeast, whereas t. dimidiata was not attracted. the potential use of yeast baited traps for capturing these vectors of chagas disease is discussed.
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