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Search Results: 1 - 10 of 415 matches for " lutzomyia longipalpis "
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Novos encontros de flebotomíneos no Estado de S?o Paulo, Brasil, com especial referência à Lutzomyia longipalpis
Forattini,Oswaldo Paulo; Rabello,Ernesto Xavier; Galati,Eunice Aparecida Bianchi;
Revista de Saúde Pública , 1976, DOI: 10.1590/S0034-89101976000100012
Abstract: new records on phlebotominae in the state of s. paulo, brazil, are reported. special attention is dedicated to lutzomyia longipalpis. several behavioural aspects of these observations were recorded.
Prevalência da microbiota no trato digestivo de fêmeas de Lutzomyia longipalpis (Lutz & Neiva, 1912) (Diptera: Psychodidae) provenientes do campo
Oliveira, Sandra Maria Pereira de;Moraes, Bianca Aguiar de;Gon?alves, Claudia Abrantes;Giordano-Dias, Cristina Maria;d'Almeida, José Mario;Asensi, Marise Dutra;Mello, Rubens Pinto;Brazil, Reginaldo Pe?anha;
Revista da Sociedade Brasileira de Medicina Tropical , 2000, DOI: 10.1590/S0037-86822000000300012
Abstract: we dissected the digestive tract of 245 females in pools of 35 flies forming 7 groups. these flies were lutzomyia longipalpis originating from lapinha cave, lagoa santa, minas gerais. out of the 8 species of bacteria isolated there was a predominancy of gram negative bacterias (gnb) in the group of non-fermenters of sugar belonging to the following species: acinetobacter lwoffii, stenotrophomonas maltophilia, pseudomonas putida and flavimonas orizihabitans. the group of gnb fermenters were: enterobacter cloacae and klebsiella ozaenae. in the gram positive group we isolated the genera bacillus thuringiensis and staphylococcus spp.
Biologia de Lutzomyia intermedia Lutz & Neiva, 1912 e Lutzomyia longypalpis Lutz & Neiva, 1912 (Diptera, Phychodidae), em condi??es experimentais. I. aspectos da alimenta??o de larvas e adultos
Rangel, Elizabeth F.;Souza, Nataly A.;Wermelinger, Eduardo D.;Barbosa, André F.;Andrade, Claudia A.;
Memórias do Instituto Oswaldo Cruz , 1986, DOI: 10.1590/S0074-02761986000400010
Abstract: to improve our knowledge on the breeding and behaviour of sandflies in captivity, we established closed colonies of lutzomyia intermedia and lutzomyia longipalpis. data are here presented on the feeding preferences of larvae and adults and their influence on the development and survival of each species. fish food is accepted by the larvae of both species; it is easily available, unexpensive and does not encourage the growth of fungi. the larvae of both species, in all stages accepted food of vegetal and mixed origin, but the 1st and 2nd stage larvae of l. intermedia preferred vegetal food, while the 3rd and 4th stage larvae of l. longipalpis showed a discreet preference for mixed food. previous feeding on sugar was not necessary to induce a blood meal. both species can feed on man, dog, hamster and bird, but better development was obtained when the females was fed on hamster. the female of l. longipalpis were more resistant to the absence of blood meal than those of l.intermedia, although 70% of both were able to survive on a sugar meal up to seven days.
Aislamiento reproductivo asimétrico entre Lutzomyia pseudolongipalpis y Lutzomyia longipalpis (especie C2), vectores neotropicales de leishmaniasis visceral (Diptera: Pshychodidae)
Arrivillaga,Jazzmin; Salerno,Patricia; Rangel,Yadira;
Revista de Biología Tropical , 2009,
Abstract: asymmetric reproductive isolation between lutzomyia pseudolongipalpis and lutzomyia longipalpis (species c2), neotropical vectors of visceral leishmaniasis (diptera: pshychodidae). lutzomyia pseudolongipalpis and lutzomyia longipalpis (species c2, l. sp n.) are two endemic species of phlebotominae sand fly vectors from venezuela. the two insects are sympatric and monophyletic but have deeply diverging, morphological differences. they belong to the l. longipalpis complex. a study of their reproductive isolation is necessary to understand the process of speciation and maintenance of the two sister species as two discrete taxonomic and biological entities. cross-mating tests were conducted (homo and hetero-specific) and monitored under two criteria: biological (presence of copulation and offspring) and genetic (using two isozymic markers diagnostic for the l. longipalpis complex; enzyme diagnosis ak and hk). results indicate reproductive isolation, with an asymmetrical genetic exchange in a direction of hybridization between the two species under experimental conditions, and production of a low number of heterozygotes. these findings support the existence of negative selection on hybrids, and explain the absence of hybrids under natural conditions, in the sympatric locality. rev. biol. trop. 57 (1-2): 23-31. epub 2009 june 30.
The transmission of Leishmania infantum chagasi by the bite of the Lutzomyia longipalpis to two different vertebrates
Nagila FC Secundino, Vanessa C de Freitas, Carolina C Monteiro, Ana-Clara AM Pires, Bruna A David, Paulo FP Pimenta
Parasites & Vectors , 2012, DOI: 10.1186/1756-3305-5-20
Abstract: This study presents the establishment of a transmission model of Leishmania infantum chagasi by the bite of Lutzomyia longipalpis, the vector of American visceral leishmaniasis. The parasites were successfully transmitted by infected sandfly bites to mice and hamsters, indicating that both animals are good experimental models. The L. infantum chagasi dose that was transmitted in each single bite ranged from 10 to 10, 000 parasites, but 75% of the sandflies transmitted less than 300 parasites.The strategy for initiating infection by sandfly bite of experimental animals facilitates future investigations into the complex and dynamic mechanisms of visceral leishmaniasis. It is important to elucidate the transmission mechanism of vector bites. This model represents a useful tool to study L. infantum chagasi infection transmitted by the vector.Despite the fact that Leishmania is transmitted exclusively by sandfly vectors, a reproducible animal model of Leishmania infection transmitted by sandfly bite was only described in the year 2000 [1].Early investigations showed that infected P. papatasi sandflies can release from 0 to over 1,000 L. major promastigotes through their proboscides by forced feeding [2]. However, a transmission model by bite with P. duboscqui infected with L. major found that the parasite numbers inoculated in the host skin by one insect vector alone could vary from 10 to 100,000 [3].Considering the New World species of Leishmania, using a feeding device of chick skin membrane over culture medium showed that L. longipalpis sandflies infected with Leishmania mexicana (an unnatural vector/parasite pair) expelled an average of 1,000 parasites per fly [4]. Thus, even though L. longipalpis is the vector of L. infantum chagasi in nature, it is permissive in the laboratory to infection with other Leishmania species.In consideration of the continuing prevalence of American visceral leishmaniasis and the paucity of related studies in the literature, our goal was
Disruption of the peritrophic matrix by exogenous chitinase feeding reduces fecundity in Lutzomyia longipalpis females
Araújo, Adriana Pereira Oliveira de;Telleria, Erich Loza;Dutra, Juliana da Matta Furniel;Júlio, Rute Maria;Traub-Csek?, Yara Maria;
Memórias do Instituto Oswaldo Cruz , 2012, DOI: 10.1590/S0074-02762012000400016
Abstract: lutzomyia longipalpis is the most important vector of visceral leishmaniasis in brazil. when female sandflies feed on blood, a peritrophic matrix (pm) is formed around the blood bolus. the pm is secreted by midgut cells and composed of proteins, glycoproteins and chitin microfibrils. the pm functions as both a physical barrier against pathogens present in the food bolus and blood meal digestion regulator. previous studies of mosquitoes and sandflies have shown that the absence of a pm, resulting from adding an exogenous chitinase to the blood meal, accelerates digestion. in the present study, we analysed biological factors associated with the presence of a pm in l. longipalpis females. insects fed blood containing chitinase (bcc) accelerated egg-laying relative to a control group fed blood without chitinase. however, in the bcc-fed insects, the number of females that died without laying eggs was higher and the number of eggs laid per female was lower. the eggs in both groups were viable and generated adults. based on these data, we suggest that the absence of a pm accelerates nutrient acquisition, which results in premature egg production and oviposition; however, the absence of a pm reduces the total number of eggs laid per female. reduced fecundity in the absence of a pm may be due to inefficient nutrient conversion or the loss of the protective role of the pm.
Visceral leishmaniasis in border areas: clustered distribution of phlebotomine sand flies in Clorinda, Argentina
Salomón, Oscar D;Quintana, María G;Bruno, Mario R;Quiriconi, Ricardo V;Cabral, Viviana;
Memórias do Instituto Oswaldo Cruz , 2009, DOI: 10.1590/S0074-02762009000500024
Abstract: three years after the first report of lutzomyia longipalpis in clorinda, argentina, a border city near asunción, paraguay, the city was surveyed again. lu. longipalpis was found clustered in the same neighbourhoods in 2007 as in 2004, even though the scattered distribution of canine visceral leishmaniasis was more related to the traffic of dogs through the border.
Lutzomyia longipalpis in Clorinda, Formosa province, an area of potential visceral leishmaniasis transmission in Argentina
Salomón, Oscar D;Orellano, Pablo W;
Memórias do Instituto Oswaldo Cruz , 2005, DOI: 10.1590/S0074-02762005000500005
Abstract: phlebotomine captures were performed during 2004 in clorinda, argentina. clorinda is located across the branches of the paraguay river in front of asunción city, paraguay. reports of canine and human visceral leishmaniasis in asunción have been increasing since 1997, however neither leishmaniasis cases nor sand flies were ever recorded from clorinda. light traps were located in migration paths (bridges, port), and peridomestic environments of clorinda and surrounding localities. lutzomyia longipalpis was found in clorinda and puerto pilcomayo, first report in a potential visceral leishmaniasis transmission area for argentina. active surveillance is required immediately in the localities involved and the surrounding area.
Lutzomyia longipalpis in Uruguay: the first report and the potential of visceral leishmaniasis transmission
Salomón, Oscar Daniel;Basmajdian, Yester;Fernández, María Soledad;Santini, María Soledad;
Memórias do Instituto Oswaldo Cruz , 2011, DOI: 10.1590/S0074-02762011000300023
Abstract: phlebotomine captures were performed in february 2010 in salto (salto department) and bella unión-cuarein (artigas department), uruguay. bella unión is located across the paraná river from monte caseros, argentina, where a focus of canine visceral leishmaniasis (vl) was reported in 2009. no vl cases have ever been recorded in uruguay and the last reported capture of phlebotominae was in 1932 (lutzomyia cortelezzii and lutzomyia gaminarai). light traps were placed in peridomestic environments, and lutzomyia longipalpis, the main vector of visceral leishmaniasis, was found in salto and bella unión. this is a first report of an area of potential vl transmission in uruguay. active and coordinated surveillance is required immediately the uruguay-argentina-brazil border area.
Courtship song genes and speciation in sand flies
Oliveira, SG;Bottecchia, M;Bauzer, LGSR;Souza, NA;Ward, RD;Kyriacou, CP;Peixoto, AA;
Memórias do Instituto Oswaldo Cruz , 2001, DOI: 10.1590/S0074-02762001000300022
Abstract: lutzomyia longipalpis (lutz & neiva, 1912) (diptera: psychodidae: phlebotominae) is a vector of visceral leishmaniasis in the americas and it might represent a complex of sibling species. reproductive isolation between closely related species often involves differences in courtship behaviour. cacophony (cac) and period (per) are two drosophila genes that control features of the "lovesong" males produce during courtship that has been implicated in the sexual isolation between closely related species. we are using gene fragments from l. longipalpis' homologues of these two genes to study the speciation process in this putative species complex.
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