Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Nota sobre Lutzomyia (Lutzomyia) Cruzi (mangabeira, 1938), com a descri??o da fêmea (Diptera, Psychodidae, Phlebotominae)
Martins, A. Vianna;Falc?o, Alda Lima;Silva, Jo?o Evangelista da;Dias, Edelberto Santos;
Memórias do Instituto Oswaldo Cruz , 1984, DOI: 10.1590/S0074-02761984000400007
Abstract: after examining the type of lutzomyia (lutzomyia) cruzi (mangabeira, 1938), kept in the collection of the instituto oswaldo cruz (rio de janeiro), under number 941, and 74 male specimens of the species, mostly from the type locality (camapuan, state of mato grosso do sul), the authors verified that the basal tuft of the coxite is composed of only four foliaceous setae, and not six, as stated by mangabeira, due the superposition of the two coxites holotype. a redescription of the male based on the holotype and a description of the previously unknown female are presented.
Distribui??o espacial de Lutzomyia longipalpis (Lutz & Neiva, 1912) e Lutzomyia cruzi (Mangabeira, 1938) no estado de Mato Grosso
Missawa, Nanci Akemi;Lima, Giovana Belem Moreira;
Revista da Sociedade Brasileira de Medicina Tropical , 2006, DOI: 10.1590/S0037-86822006000400004
Abstract: visceral leishmaniasis is currently considered an emergent and reemergent disease, in agricultural and urban zones, both in domestic and peridomestic areas. the objective of this work was to verify the spatial distribution of lutzomyia longipalpis and lutzomyia cruzi in mato grosso state. data from 1996 to 2004 was collected by the entomology laboratory, whose captures were carried with a cdc light trap. sixty-eight of the 139 cities in the state have been studied. lutzomyia longipalpis and lutzomyia cruzi occurred in 23 and 22 cities, respectively. the results demonstrate the extensive occurrence of lutzomyia longipalpis in areas with different vegetation types: savanna, transition and amazon forest. lutzomyia cruzi occurred mainly in cities with areas of marshland and savanna. verification of the distribution of the vector populations in the state and their preferential vegetation type, provides an indication of vulnerable and/or receptive areas for disease transmission.
Sex pheromone and period gene characterization of Lutzomyia longipalpis sensu lato (Lutz & Neiva) (Diptera: Psychodidae) from Posadas, Argentina
Salomón, Oscar D;Araki, Alejandra S;Hamilton, James GC;Acardi, Soraya A;Peixoto, Alexandre A;
Memórias do Instituto Oswaldo Cruz , 2010, DOI: 10.1590/S0074-02762010000700016
Abstract: lutzomyia longipalpis s.l. is the primary vector of leishmania (l.) infantum in the new world. in this study, male lutzomyia longipalpis specimens from posadas, argentina were characterized for two polymorphic markers: the male sex pheromone and the period (per) gene. the male sex pheromone was identified as (s)-9-methylgermacrene-b, the same compound produced by lu. longipalpis from paraguay and many populations from brazil. the analysis of per gene sequences revealed that the population from argentina is significantly differentiated from previously studied brazilian populations. marker studies could contribute to the understanding of the distribution and spread of urban american visceral leishmaniasis, thus aiding in the design of regional surveillance and control strategies.
Redescri??o do macho e descri??o da fêmea de Lutzomyia (Helcocyrtomyia) Peresi (Mangabeira, 1942) (Diptera: Psychodidae, Phlebotominae)
Dias, Edelberto Santos;Martins, Amilcar Vianna;Falc?o, Alda Lima;Silva, Jo?o Evangelista da;
Memórias do Instituto Oswaldo Cruz , 1986, DOI: 10.1590/S0074-02761986000200011
Abstract: the authors redescribe the male and describe the female of lutzomyia (helcocyrtomyia) peresi (mangabeira, 1942).
Biology of Lutzomyia lenti (Mangabeira) (Diptera: Psychodidae)
Brazil, Reginaldo P.;Carneiro, Viviane L.;Andrade Filho, José D.;Alves, Jeane C. M.;Falc?o, Alda L.;
Anais da Sociedade Entomológica do Brasil , 1997, DOI: 10.1590/S0301-80591997000100026
Abstract: foi iniciada uma col?nia de lutzomyia lenti (mangabeira) com fêmeas capturadas em galinheiro, em betim, mg, utilizando-se armadilha luminosa. a col?nia apresentou um ciclo médio de 40,2 dias de ovo a adulto a 26° - 28°c e a ur 80 ± 5%. as fêmeas alimentaram-se avidamente em hamster [mesocriscetus auratus (waterhouse)], com uma postura média de 36,1 ovos / fêmea, sendo relativamente fácil de manter em laboratório. estudos preliminares de susceptibilidade sugerem que esta espécie é refratária à infec??o por leishmania.
Synthetic sex pheromone attracts the leishmaniasis vector Lutzomyia longipalpis to experimental chicken sheds treated with insecticide
Daniel P Bray, Graziella B Alves, Maria E Dorval, Reginaldo P Brazil, J GC Hamilton
Parasites & Vectors , 2010, DOI: 10.1186/1756-3305-3-16
Abstract: Addition of synthetic pheromone resulted in greater numbers of male and female sand flies being caught and killed at experimental chicken sheds sprayed with insecticide, compared to pheromone-less controls. Furthermore, a ten-fold increase in the amount of sex pheromone released from test sheds increased the number of females attracted and subsequently killed. Treating sheds with insecticide alone resulted in a significant decrease in numbers of males attracted to sheds (compared to pre-spraying levels), and a near significant decrease in numbers of females. However, this effect was reversed through addition of synthetic pheromone at the time of insecticide spraying, leading to an increase in number of flies attracted post-treatment.In field trials of commercially available different coloured sticky traps, yellow traps caught more males than blue traps when placed in chicken sheds. In addition, yellow traps fitted with 10 pheromone lures caught significantly more males than pheromone-less controls. However, while female sand flies showed a preference for both blue and yellow pheromone traps sticky traps over white traps in the laboratory, neither colour caught significant numbers of females in chicken sheds, either with or without pheromone.We conclude that synthetic pheromone could currently be most effectively deployed for sand fly control through combination with existing insecticide spraying regimes. Development of a standalone pheromone trap remains a possibility, but such devices may require an additional attractive host odour component to be fully effective.The sand fly Lutzomyia longipalpis (Diptera: Psychodidae) is the principle vector of Leishmania infantum chagasi (Kinetoplastida: Trypanosomatidiae), the causative agent of American visceral leishmaniasis (AVL) in Brazil and South America. Transmission occurs through bloodfeeding of female L. longipalpis on infected hosts [1], with domestic dogs the primary reservoir in urban and peri-urban areas. Treatmen
Identification of the sex pheromone of Lutzomyia longipalpis (Lutz & Neiva, 1912) (Diptera: Psychodidae) from Asunción, Paraguay
Reginaldo P Brazil, Norath Caballero, James Hamilton
Parasites & Vectors , 2009, DOI: 10.1186/1756-3305-2-51
Abstract: In this study, we present the results of a coupled gas chromatography - mass spectrometry analysis of the pheromones of males Lu. longipalpis captured in an endemic area of visceral leishmaniasis in Asunción, Paraguay. Our results show that Lu. longipalpis from this site produce (S)-9-methylgermacrene-B which has also been found in Lu. longipalpis from different areas of Brazil, Colombia and Central America.Visceral leishmaniasis is endemic in several areas of Paraguay with the reports of sporadic cases and consecutive increase in the last few years [1-3]. Asuncion in the Central Department of Paraguay has reported the largest numbers of human cases but other regions more distant from the capital, such as Bella Vista Norte, near the border with Brazil, Encarnacion, near the border with Argentina, and the Departments of Conception and Amambay y San Pedro have been considered as new endemic areas by the Paraguayan Health Secretary [4,5].As in most endemic areas, Lutzomyia longipalpis s.l. is the main vector of Leishmania (L.) infantum (Kinetoplastida: Trypanosomatidae), the causative agent of visceral leishmaniasis in South and Central America. Even though Lu. longipalpis is recognized as a species complex, no consensus has been established on the number of species present in the New World [6-13].Field and laboratory observations have shown that, prior to copulation, Lu. longipalpis s.l. males wing flutter. This behaviour is associated with pheromone release by males during courtship [14-16]. The sex pheromones are produced in glandular tissue that underlies the cuticle of the abdominal tergites. Those pheromone-disseminating structures are visible, as a pair of pale patches [17,18] on the fourth or third and fourth tergites and have been confirmed as the site of sex pheromone production [19]. There is no relationship between spot morphology and sex pheromone type [20]. Sex pheromones of the Lu. longipalpis species complex have been shown to be homosesquiterpenes (C16
Synthetic Sex Pheromone in a Long-Lasting Lure Attracts the Visceral Leishmaniasis Vector, Lutzomyia longipalpis, for up to 12 Weeks in Brazil  [PDF]
Daniel P. Bray,Vicky Carter,Graziella B. Alves,Reginaldo P. Brazil,Krishna K. Bandi,James G. C. Hamilton
PLOS Neglected Tropical Diseases , 2014, DOI: 10.1371/journal.pntd.0002723
Abstract: Current control methodologies have not prevented the spread of visceral leishmaniasis (VL) across Brazil. Here, we describe the development of a new tool for controlling the sand fly vector of the disease: a long-lasting lure, which releases a synthetic male sex pheromone, attractive to both sexes of Lutzomyia longipalpis. This device could be used to improve the effectiveness of residual insecticide spraying as a means of sand fly control, attracting L. longipalpis to insecticide-treated animal houses, where they could be killed in potentially large numbers over a number of weeks. Different lure designs releasing the synthetic pheromone (±)-9-methylgermacrene-B (CAS 183158-38-5) were field-tested in Ara?atuba, S?o Paulo (SP). Experiments compared numbers of sand flies caught overnight in experimental chicken sheds with pheromone lures, to numbers caught in control sheds without pheromone. Prototype lures, designed to last one night, were first used to confirm the attractiveness of the pheromone in SP, and shown to attract significantly more flies to test sheds than controls. Longer-lasting lures were tested when new, and at fortnightly intervals. Lures loaded with 1 mg of pheromone did not attract sand flies for more than two weeks. However, lures loaded with 10 mg of pheromone, with a releasing surface of 15 cm2 or 7.5 cm2, attracted female L. longipalpis for up to ten weeks, and males for up to twelve weeks. Approximately five times more sand flies were caught with 7.5 cm2 10 mg lures when first used than occurred naturally in non-experimental chicken resting sites. These results demonstrate that these lures are suitably long-lasting and attractive for use in sand fly control programmes in SP. To our knowledge, this is the first sex pheromone-based technology targeting an insect vector of a neglected human disease. Further studies should explore the general applicability of this approach for combating other insect-borne diseases.
Preliminary laboratory and field trials of a heated pheromone trap for the sandfly lutzomyia logipalpis (Diptera: Psychodidae)
Ward, Richard D.;Morton, Ian E.;Brazil, Reginaldo P.;Trumper, Sheila;Falc?o, Alda L.;
Memórias do Instituto Oswaldo Cruz , 1990, DOI: 10.1590/S0074-02761990000400009
Abstract: a heated pheromone trap for the sandfly lutzomyia longipalpis was tested in the laboratory using filter paper or plastic vial dispensers. male pheromone extracted from 8 male tergal glands and absorbed on to filter paper dispensers attracted 82/120 (68.3%) of virgin females released in cages. similarly plastic vial dispensers baited with the extract of 24 males caught 73/120 (61%). in field trials carried out near januária, minas gerais, brazil using the plastic dispensers baited with extracts of 50 male tergal glands only 70 female l. longipalpis were captured. over 1000 male flies were, however, caught during 6 nights, with greater numbers in the unbaited control traps than in the pheromone baited test traps. it is concluded that at excessive concentrations male l. longipalpis pheromone may act as a repellent to conspecific males.
Primeiro registro de Nyssomyia yuilli yuilli (Young & Porter) e de Trichopygomyia longispina (Mangabeira) (Diptera: Psychodidae) no estado do Espírito Santo, Brasil
Pinto, Israel de Souza;Pires, Jeferson Gon?alves;Santos, Claudiney Biral dos;Virgens, Thieres Marassati das;Leite, Gustavo Rocha;Ferreira, Adelson Luis;Falqueto, Aloísio;
Biota Neotropica , 2008, DOI: 10.1590/S1676-06032008000100024
Abstract: the phlebotomine sand flies nyssomyia yuilli yuilli (young & porter) (diptera: psychodidae) and trichopygomyia longispina (mangabeira) (diptera: psychodidae) are recorded in the state of espírito santo, brazil for the first time.
Page 1 /100
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.