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Search Results: 1 - 10 of 224475 matches for " Herton Helder R.;Schofield "
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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;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.
Eye colour as a genetic marker for fertility and fecundity of Triatoma infestans (Klug, 1834) Hemiptera, Reduviidae, Triatominae
Pires Herton Helder Rocha,Abr?o Daniele Oliveira,Machado Evandro Marques de Menezes,Schofield Christopher John
Memórias do Instituto Oswaldo Cruz , 2002,
Abstract: Eye colour of Triatoma infestans is controlled at a single autosomal locus, with black-eye as the dominant gene and red-eye as the recessive. Inheritance of these characters follows a classical Mendelian system, enabling eye colour to be used as a marker for studies of mating frequency. We found no significant differences in oviposition rates and egg hatching rates irrespective of parental phenotypes. Different mating schedules between red-eye and black-eye parents showed that eye colour did not affect mating competence. Females mated with a single male or with different males together or in succession produced similar numbers of fertile eggs, with the eye colour of the offspring reflecting exposure to the different males. We conclude that although a single mating can provide sufficient sperm for the whole reproductive life of the female, multiple matings can result in balanced assortative sperm usage from the spermatheca.
Eye colour as a genetic marker for fertility and fecundity of Triatoma infestans (Klug, 1834) Hemiptera, Reduviidae, Triatominae
Pires, Herton Helder Rocha;Abr?o, Daniele Oliveira;Machado, Evandro Marques de Menezes;Schofield, Christopher John;Diotaiuti, Liléia;
Memórias do Instituto Oswaldo Cruz , 2002, DOI: 10.1590/S0074-02762002000500016
Abstract: eye colour of triatoma infestans is controlled at a single autosomal locus, with black-eye as the dominant gene and red-eye as the recessive. inheritance of these characters follows a classical mendelian system, enabling eye colour to be used as a marker for studies of mating frequency. we found no significant differences in oviposition rates and egg hatching rates irrespective of parental phenotypes. different mating schedules between red-eye and black-eye parents showed that eye colour did not affect mating competence. females mated with a single male or with different males together or in succession produced similar numbers of fertile eggs, with the eye colour of the offspring reflecting exposure to the different males. we conclude that although a single mating can provide sufficient sperm for the whole reproductive life of the female, multiple matings can result in balanced assortative sperm usage from the spermatheca.
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.
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.
The sexual behaviour of Panstrongylus megistus (Hemiptera: Reduviidae): an experimental study
Pires, Herton Helder Rocha;Lorenzo, Marcelo Gustavo;Lazzari, Claudio Ricardo;Diotaiuti, Liléia;Manrique, Gabriel;
Memórias do Instituto Oswaldo Cruz , 2004, DOI: 10.1590/S0074-02762004000300010
Abstract: the factors affecting the sexual behaviour of panstrongylus megistus were studied under laboratory conditions. a general description of mating behaviour is presented for this species. the effect of the time elapsed after the first imaginal feeding on the mating frequency, the motivation of males to mate and the rejection behaviour by females, were analyzed. we also determined the number of copulas accepted by females of this species. finally, the possible existence of a sexual chemical signal promoting male aggregation around mating couples was evaluated. results showed that mating frequency increased with the time elapsed since the first adult meal. despite the number of male copulatory attempts did not change as a function of time, the rejection behaviour of females became gradually less frequent. females rejected mating by means of body flattening on the substrate, abdominal movements, evasion or stridulation. after a single copula, females did not usually accept to mate again. neither male nor female aggregation around mating couples was observed, suggesting the absence of a sexual assembling pheromone in p. megistus.
Variations of the External Male Genitalia in Three Populations of Triatoma infestans Klug, 1834
Pires, Herton Helder Rocha;Barbosa, Silvia Ermelinda;Margonari, Carina;Jurberg, José;Diotaiuti, Liléia;
Memórias do Instituto Oswaldo Cruz , 1998, DOI: 10.1590/S0074-02761998000400011
Abstract: triatoma infestans is the triatomine that presents the greatest dispersion area in south america. however, it is not known whether the original characteristics of this insect remained in its long dispersion process. the purpose of this work was to study comparatively the external male genitalia of insects from different populations of t. infestans, two from brazil (minas gerais and bahia) and one from bolivia (cochabamba valley), and to investigate the correlation between the morphological and behavioral variations. differences were observed in one of the structures of the external genitalia (endosoma process) that could be used to characterize the insects from the three populations studied.
Peridomiciliary Infestation with Triatoma sordida Stal, 1859 in the County of Serra do Ramalho, Bahia, Brazil
Pires Herton Helder Rocha,Borges érika Carime,Andrade Regina Esteves de,Lorosa Elias Seixas
Memórias do Instituto Oswaldo Cruz , 1999,
Abstract:
Variations of the External Male Genitalia in Three Populations of Triatoma infestans Klug, 1834
Pires Herton Helder Rocha,Barbosa Silvia Ermelinda,Margonari Carina,Jurberg José
Memórias do Instituto Oswaldo Cruz , 1998,
Abstract: Triatoma infestans is the triatomine that presents the greatest dispersion area in South America. However, it is not known whether the original characteristics of this insect remained in its long dispersion process. The purpose of this work was to study comparatively the external male genitalia of insects from different populations of T. infestans, two from Brazil (Minas Gerais and Bahia) and one from Bolivia (Cochabamba Valley), and to investigate the correlation between the morphological and behavioral variations. Differences were observed in one of the structures of the external genitalia (endosoma process) that could be used to characterize the insects from the three populations studied.
Capture of Triatoma arthurneivai (Hemiptera: Reduviidae) using a new luminous trap in Southeast Brazil
Dias, Jo?o Victor Leite;Avelar, Bethania Alves de;Cirqueira Júnior, Hildebrando;Diotaiuti, Liléia;Pires, Herton Helder Rocha;
Revista da Sociedade Brasileira de Medicina Tropical , 2011, DOI: 10.1590/S0037-86822011000600023
Abstract: introduction: triatomine bug captures in the wild are laborious and time-consuming. some traps may assist in this task. we report a new trap design and the capture of a specimen of a triatomine rarely found. methods: two luminous traps were installed in the city of diamantina, state of minas gerais, and surveyed weekly for a year. results: a triatoma arthurneivai female and other triatomine bugs were caught. conclusions: a new trap design may be used in triatomine bugs field captures, mainly in low density areas. we assume the center of endemism of triatoma arthurneivai is the espinha?o mountain range.
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