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Search Results: 1 - 10 of 284193 matches for " Louren?o-de-Oliveira Ricardo "
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Alguns aspectos da ecologia dos mosquitos (Diptera: Culicidae) de uma área de planície (Granjas Calábria), em Jacarepaguá, Rio de Janeiro. I. frequência comparativa das espécies em diferentes ambientes e métodos de coleta
Loureno-de-Oliveira, Ricardo;
Memórias do Instituto Oswaldo Cruz , 1984, DOI: 10.1590/S0074-02761984000400014
Abstract: results are here presented on mosquito catches performed in a coastal lowland farm - granjas calábria, in jacarepaguá, city of rio de janeiro, brazil, from august 1981 to july 1983. our objectives were to determine the local species and to study their frequency in different environments and methods of capture. we obtained 20.472 adult mosquitoes, belonging to 50 species, several of which are known vectors of human diseases in other areas. nine species are reported for the first time in the state of rio de janeiro. ma. titillans was the more commom species in the catches of adultspecimens, followed by ae. scapularis, ph. deanei. ph. davisi, cx. saltanensis, ae. taeniorhynchus and ph. theobaldi. ma. titillans was also the most numerous on human bait. the mosquito fauna obtained in light-trap was quite distinct from that of captures on human and animal baits, the most numerous mosquito being ur. lowi. the catches in the open country were less productive than in the residual forest except for some species, like ma. titillans, cq. venezuelensis, cx. amazonensis and wy. leucostigma which were equally or more frequent in the opposite situation.
The subgenus Dendromyia theobald: a review with redescriptions of four species (Diptera: Culicidae)
Motta, Monique Albuquerque;Loureno-de-Oliveira, Ricardo;
Memórias do Instituto Oswaldo Cruz , 2000, DOI: 10.1590/S0074-02762000000500011
Abstract: a morphological study of larval, pupal and adult life stages (including genitalia characters) was performed in order to evaluate the classification of the subgenus dendromyia, genus wyeomyia theobald. six species are included: wy. ypsipola dyar, wy. jocosa (dyar & knab), wy. testei senevet & abonnenc, wy. complosa (dyar), wy. luteoventralis theobald and wy. trifurcata clastrier, the first four of which are redescribed. the descriptions include illustrations of the male and female genitalia, fourth-instar larva and pupa. the result firmly supports dendromyia as a monophyletic group, with well defined characters. keys for the identification of all life stages of species included in dendromyia are provided.
What is Anopheles Allopha (Lutz & Peryassú, 1921) (Diptera: Culicidae)?
Loureno-de-Oliveira, Ricardo;Deane, Leonidas M.;
Memórias do Instituto Oswaldo Cruz , 1984, DOI: 10.1590/S0074-02761984000400019
Abstract: we regard anopheles (nyssorhynchus) allpha (lutz & peryassú, 1921) as a nomen nudum in view of the ambiguities in its original description, as explained in this note.
Simian malaria at two sites in the Brazilian Amazon - II: Vertical distribution and frequency of anopheline species inside and outside the forest
Loureno-de-Oliveira, Ricardo;Luz, Sergio LB;
Memórias do Instituto Oswaldo Cruz , 1996, DOI: 10.1590/S0074-02761996000600005
Abstract: an anopheline survey was carried out in two simian malaria areas in the brazilian amazon, balbina and samuel, to determine the potential vectors of plasmodium brasilianum. the most abundant and/or acrodendrophilic anophelines in the forest and the most likely vector were anopheles mediopunctatus, an. nuneztovari, an. oswaldoi, an. triannulatus and an. shannoni. an. darlingi and an. marajoara were captured essentially in anthropic habitats outside the forest and are unlikely to be involved in the transmission of p. brasilianum among monkeys within the forests and from monkeys to man in their surroundings in the amazon.
Wyeomyia luteoventralis Theobald, the type species of the subgenus Dendromyia Theobald (Diptera: Culicidae)
Motta, Monique Albuquerque;Loureno-de-Oliveira, Ricardo;
Memórias do Instituto Oswaldo Cruz , 1995, DOI: 10.1590/S0074-02761995000300012
Abstract: wyeomyia (dendromyia) luteoventralis is redescribed from females, males, larvae and pupae collected at the type locality, in brazil, and compared to the closely related species. at least six species - wy. luteoventralis, wy. ypsipola, wy. testei, wy. trifurcata, wy. complosa and wy. jocosa - appparently, belong to a monophyletic group, the subgenus dendromyia. all other species previously included in dendromyia are hereby excluded from this subgenus and retained in genus wyeomyia without subgeneric placement.
Alguns aspectos da ecologia dos mosquitos (Diptera: Culicidae) de uma área de planície (granjas Calábria) em Jacarepaguá, Rio de Janeiro: IV. Preferências alimentares quanto ao hospedeiro e freqüência domiciliar
Loureno-de-Oliveira, Ricardo;Heyden, Rosemarie;
Memórias do Instituto Oswaldo Cruz , 1986, DOI: 10.1590/S0074-02761986000100003
Abstract: results are presented on mosquito catches performed between january 1982 and march 1983, in granjas calábria, rio de janeiro, brazil, in order to evaluate their host preferences. we used six baits, man, horse, cow, sheep, cock and toad. horse attracted the greatest number of mosquitoes, followed by cow, man, cock and sheep, no mosquito fed on toad. man was the bait which attracted the largest number of species. most local species were definetely zoophilic - an. albitarsis, an. aquasalis, ae. scapularis, ae. taeniorhynchus, cq. venezuelensis, ma. titillans, ps. ciliata, ph. davisi and ph. deanei preferred mainly horse and cow, while the species of culex of subgenus culex preferred avian blood, and those of subgenus microculex showed a marked preference to fed on a toad, in our laboratory experiments. ma. titillans was the most abundant mosquito on all baits, being hightly ecletic. catches were carried out monthlt, indoors and outdoors, from august 1981 to july 1982 in order to study the house frequency. the local species rarely invaded the house. ma. titillans, ae. scapularis, ae. taeniorhynchus and cx. saltanenesis were occasionally found inside human dwellings but were much more frequently caught outdoors. an. aquasalis and cx. quinquefasciatus showed to be the most domestic.
Morphological Features of Trypanosomes from Squirrel Monkeys from the Brazilian Amazon
Ziccardi, Mariangela;Loureno-de-Oliveira, Ricardo;
Memórias do Instituto Oswaldo Cruz , 1998, DOI: 10.1590/S0074-02761998000100010
Abstract: a morphometric analysis of blood trypomastigotes identified as trypanosoma minasense, t. saimirii, and t. rangeli harbored by squirrel monkeys from the brazilian amazon was performed. additionally, morphological and biological comparative analyses were conducted of t. saimirii-like and t. rangeli development forms from haemoculture and xenodiagnosis. illustrations are given of blood trypomastigotes as well as of developing flagellates in triatomine and axenic culture. mean values of blood trypomastigotes of t. saimirii differ statistically from those of t. rangeli in only two out of ten morphological characters measured, and ranges overlapped. the developing forms of t. saimrii-like parasites were essentially identical in both xenodiagnosis and haemoculture to those of t. rangeli. trypanosomes confirmed as t. rangeli were transmitted to mice by the bites of the great majority of triatomines that fed on t. saimirii-like infected monkeys. we conclude that, based on morphology and on the development in triatomine bugs and haemoculture, t. saimirii should not be considered a distinct species. we therefore propose t. saimirii to be a junior synonym of t. rangeli
Polymorphism in Trypomastigotes of Trypanosoma (Megatrypanum) minasense in the blood of experimentally infected squirrel monkey and marmosets
Ziccardi, Mariangela;Loureno-de-Oliveira, Ricardo;
Memórias do Instituto Oswaldo Cruz , 1999, DOI: 10.1590/S0074-02761999000500016
Abstract: experimental infections by trypanosoma (megatrypanum) minasense were performed in primates - saimiri sciureus and callithrix penicillata - with the objective of searching for morphological variations of the blood trypomastigotes with respect to hosts and time of infection. we carried out morphological and morphometric analysis of blood trypomastigotes. illustrations are given. both the squirrel monkey and marmoset became infected after the injection of blood trypomastigotes of t. minasense , although the parasitaemia were briefer in the squirrel monkey. the parasites detected in the later host were narrower and shorter than those found in the inoculated marmoset. in the marmoset, the blood stream parasites derived from culture metacyclic trypomastigotes were considerably smaller than those derived from the inoculation of infected blood. stronger evidence of polymorphism was found when, at the same time of infection, the blood trypomastigotes found in squirrel monkey had smaller length, body width and the distance from posterior end of the body to the kinetoplast almost four times smaller than the parasite found in the marmoset. therefore, conflicting results on morphology and morphometry of t. minasense obtained by previous investigators could be due to polymorphism.
Simian malaria at two sites in the Brazilian Amazon: I-The infection rates of Plasmodium brasilianum in non-human primates
Loureno-de-Oliveira, Ricardo;Deane, Leonidas M.;
Memórias do Instituto Oswaldo Cruz , 1995, DOI: 10.1590/S0074-02761995000300004
Abstract: the parasite that causes simian malaria in the brazilian amazon, plasmodium brasilianum, is infective to man. in this region, where humans live within and in close proximity to the forest, it was suspected that this parasite could be the cause of a zoonosis. a study was performed in the areas surrounding two hydroelectric plants in the amazon, balbina and samuel, aiming at determining the zoonotic potential of this parasite. p. brasilianum was detected in, respectively, 15.8% and 9.9% of 126 and 252 primates belonging to seven and eight species examined from balbina and samuel. the highest malaria infection rates were found among the red-howler monkey alouatta seniculus straminea (32.3%), the bearded-saki chiropotes satanas chiropotes (50%) and the spider-monkey ateles paniscus paniscus (2[1+]) from balbina and in the squirrel-monkey saimiri ustus (21%) and the black-faced-spider-monkey ateles paniscus chamek (28.6%) from samuel.
Mosquitos vetores potenciais de dirofilariose canina na Regi?o Nordeste do Brasil
Ahid,Silvia MM; Loureno-de-Oliveira,Ricardo;
Revista de Saúde Pública , 1999, DOI: 10.1590/S0034-89101999000600007
Abstract: introduction: in some coastal districts of s?o luís, capital of the state of maranh?o, brazil, the prevalence of dirofilaria immitis is more than 40% in house dogs. natural potential vectors, as found in other areas of northeastern brazil, are unknown. the aim of this study was to identify probable vectors of the disease. methods: mosquito catches were performed at a coastal, district olho d'água, in s. luís, to look for local potential vectors. captures were carried out monthly, from march 1996 to may 1997, outdoors, having a man and a dog as baits. mosquitoes were dissected for d. immitis larvae. results: a total of 1,738 mosquitoes belonging to 11 species were collected. culex quinquefasciatus, the only species collected every month, was more frequently in the dry season. it accounted for 54.5% of the total, followed by aedes albopictus (20.3%), ae. scapularis (11%) and ae. taeniorhynchus (11%). d. immitis larvae were detected in 0.1% of the cx. quinquefasciatus dissected (l3 in the malpighian tubules) and 0.5% of the ae. taeniorhynchus (l2 in the malpighian tubules). conclusion: ae. taeniorhynchus and cx. quinquefasciatus are considered natural potential vectors of the canine heartworm in s?o luís. the role of cx. quinquefasciatus as primary vector of d. immitis, however, needs further evaluation.
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