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Search Results: 1 - 10 of 26200 matches for " Octávio Alves; Rabello "
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Aspectos ecológicos da Tripanossomíase americana: XII - Varia??o regional da tendência de Panstrongylus megistus à domicilia??o
Forattini,Oswaldo Paulo; Ferreira,Octávio Alves; Silva,Eduardo Olavo da Rocha e; Rabello,Ernesto Xavier;
Revista de Saúde Pública , 1978, DOI: 10.1590/S0034-89101978000200013
Abstract: the development of spontaneous colonies of panstrongylus megistus in experimental fowlhouses showed regional variation with positive results in regions with an annual dry season, and negative ones in regions without this well-marked period. beside this, the influence of the forest cover was suggested. places with forest relics are shelters of the insect populations developing a higher ecological valence with a tendency to artificial ecotope invasion. populations living in the more primitive and extensive forest environment of the serra do mar system seem to preserve mainly their wild behaviour, without a significant development of invasive power of artificial ecotopes. the association of this evidence, with primitive phytogeographic aspects, suggests that the dispersion center is the serra do mar system, from which the insect populations spread towards the west across south america. man-made evironmental changes, mainly with forest destructions will probably enhance secondary adaptation to human dwellings. so, depending on the land utilization, the need of epidemiological surveillance should be emphasized.
Aspectos ecológicos da tripanossomíase americana: XV - desenvolvimento, varia??o e permanência de Triatoma sordida, Panstrongylus megistus e Rhodnius neglectus em ecótopos artificiais
Forattini,Oswaldo Paulo; Ferreira,Octávio Alves; Silva,Eduardo Olavo da Rocha e; Rabello,Ernesto Xavier;
Revista de Saúde Pública , 1979, DOI: 10.1590/S0034-89101979000300007
Abstract: spontaneous colonies of triatoma sordida, panstrongylus megistus, and rhodnius neglectus developed in experimental fowlhouses were observed for the conditions for their development and the variation and permanence of their components. t. sordida colonization and dispersal is favored by open areas, mainly pasture lands where many dry trees remain as the result of primitive vegetation destruction. development of p. megistus occurs near residual forests, and it seems that artificial environment attraction is due mainly to the number of peridomestic dwellings. r. neglectus showed a degree of adaptation to the artificial ecotopes and also great dispersal capacity. more intensive production of adults and first nymphs of t. sordida was observed in the first half-year. this pattern seems to show a period of greater infestation by the bug colonies. the presence of visitor nymphs of t. sordida suggests a dispersal capacity of these forms.
Aspectos ecológicos da Tripanossomíase americana: VIII - Domicilia??o de Panstrongylus megistus e sua presen?a extradomiciliar
Forattini,Oswaldo Paulo; Ferreira,Octávio Alves; Silva,Eduardo Olavo da Rocha e; Rabello,Ernesto Xavier;
Revista de Saúde Pública , 1977, DOI: 10.1590/S0034-89101977000100007
Abstract: local pattern of domiciled and wild distribution of panstrongylus megistus was observed through artificial and natural ecotopes investigation. the bug was found inhabiting periodomestic dwellings and hollow trees in the sylvatic environment serving as shelters for wild animals. this was mainly represented by spots of remaining forests. colonization of experimental chicken houses was obtained suggesting that interchange occurs between natural and artificial ecotopes. so it seems suitable to atribute high ecological valence to this bug population.
Aspectos ecológicos da tripanossomíase americana: IX - Varia??o e mobilidade de Panstrongylus megistus em ecótopos artificiais
Forattini,Oswaldo Paulo; Ferreira,Octávio Alves; Silva,Eduardo Olavo Rocha e; Rabello,Ernesto Xavier;
Revista de Saúde Pública , 1977, DOI: 10.1590/S0034-89101977000200005
Abstract: spontaneous colonies of panstrongylus megistus developed in experimental fowlhouses showed annual variation with more intensive adult production in the second half-year. this pattern may be attributed to the start of the rainy season. by individual tagging a general aspect obtained was that fifth nymphs were more permanent and some adult females showed a permanence of several months. besides this, the triatomid showed a dispersal capacity, reaching other fowlhouses and reappering after absence of two to eight months. these findings show a considerable ecological valence of this population and a trend towards invasion of artificial ecotopes that reveal microclimatical conditions similar to the normal ones.
Aspectos ecológicos da tripanossomíase americana: XIV - Persistência e potencial de domicilia??o de popula??es triatomínicas silvestres em regi?o de intensa atividade agropecuária
Forattini,Oswaldo Paulo; Ferreira,Octávio Alves; Rocha e Silva,Eduardo Olavo da; Rabello,Ernesto Xavier;
Revista de Saúde Pública , 1979, DOI: 10.1590/S0034-89101979000200009
Abstract: the results of observation of sylvatic triatominae population in a region of intensive agricultural and cattle breeding activity are reported. important environmental changes had occurred in the area, including destruction of the primitive vegetation and intensive use of pesticides. nevertheless, these modifications apparently did not affect the survival of triatominae, since they were found in the remaining vegetation. moreover, this destruction seems to have favored, to some extent, survival of triatoma sordida by increasing the available ecotopes. this species, as well as panstrongylus megistus and rhodnius neglectus, showed enough ecological valence to colonize experimental fowes houses, used as artificial ecotopes.
Aspectos ecológicos da Tripanossomíase americana: VI - Persistência do Triatoma sordida apósaltera??o ambiental e suas possíveis rela??es com a dispers?o da espécie
Forattini,Oswaldo Paulo; Ferreira,Octávio Alves; Rocha e Silva,Eduardo Olavo da; Rabello,Ernesto Xavier;
Revista de Saúde Pública , 1974, DOI: 10.1590/S0034-89101974000300003
Abstract: studies about permanence of triatoma sordida after temporary alteration of the local vegetation are related. results reached showed a bug resistence to the devastation of shrubby vegetation by fire. an attempt is made for to relate this particular aspect with species distribution in the s. paulo state, brazil. there are some analogies between the available data about this and the development of agrarian activities. beside the climatic one, this factor may be considered as favorable to the triatoma sordida dispersion, by the natural environmental alteration who if follows.
Aspectos ecológicos da tripanossomíase americana: VII. Permanência e mobilidade do Triatoma sordida em rela??o aos ecótopos artificiais
Forattini,Oswaldo Paulo; Ferreira,Octávio Alves; Silva,Eduardo Olavo da Rocha e; Rabello,Ernesto Xavier;
Revista de Saúde Pública , 1975, DOI: 10.1590/S0034-89101975000400003
Abstract: spontaneous colonies of triatoma sordida developed in experimental fowlhouses were submitted to observations as regards permanence and mobility of this bug. during thirteen months, adults and nymphs of fourth and fifth in stars were tagged for recapture. resting traps for atracting bugs were placed around the fowlhouses. adults showed no more than two months of permanence inside these artificial ecotopes. eggs and first nymphs found in the resting traps suggested activity of adults coming from the fowlhouses. it was evident that this triatomid has a dispersal capacity and an adult tendency towards leaving the colonies as soon as the first egg batches are layed. after this the female will continue the oviposition inside other ecotopes attempting to develop new colonies. this aspect agress with the high characteristic ecological valence of this bug.
Nota sobre infec??o natural de Oryzomys capito laticeps em foco enzoótico de leishmaniose tegumentar no Estado de S?o Paulo, Brasil
Forattini,Oswaldo Paulo; Pattoli,Dino B. G.; Rabello,Ernesto Xavier; Ferreira,Octávio Alves;
Revista de Saúde Pública , 1973, DOI: 10.1590/S0034-89101973000200010
Abstract: natural infection of silvatic rodent oryzomys capito laticeps in an enzootic focus of cutaneous leishmaniasis in s. paulo state, brazil, is reported. the infection was due to the leishmania braziliensis braziliensis and identification was reached by experimental inoculation of the isolated strain in hamsters. by the first time that rodent is incriminated as natural reservoir of the mucocutaneous form of leishmaniasis.
Nota sobre um foco de Leishmaniose tegumentar na regi?o Nordeste do Estado de S?o Paulo, Brasil
Forattini,Oswaldo Paulo; Rabello,Ernesto X.; Pattoli,Dino B. G.; Ferreira,Octávio Alves;
Revista de Saúde Pública , 1972, DOI: 10.1590/S0034-89101972000100012
Abstract: a focus of cutaneous leishmaniasis, in the s?o paulo state, brazil is reported. it was found at the northeast region, were the disease have not noticed since 1939. evidence of natural enzootic foci of the infection is presented by the local persistence of an primitive forest area.
Aspectos ecológicos da tripanossomose americana: V- observa??es sobre coloniza??o espontanea de triatomíneos silvestres em ecótopos artificiais, com especial referência ao Triatoma sordida
Forattini,Oswaldo Paulo; Ferreira,Octávio Alves; Rocha e Silva,Eduardo Olavo da; Rabello,Ernesto Xavier;
Revista de Saúde Pública , 1973, DOI: 10.1590/S0034-89101973000300004
Abstract: attempts to detect artificial ecotopes invasion by sylvatic triatomids bugs are related. experimental chickenhouses were built. inside areas with natural populations of triatoma sordida and t. arthurneivai. invasive action of both triatomids was observed but only t. sordida colonized spontaneously in a definitive manner. colonies of this bug showed great stability with the presence of the sylvatic population. this one was detected by the use of resting traps for atracting bugs. these was represented by simple hiding-place made with two forty centimeters length and ten width jointed boards, placed at several situations, manly on trees stemps. the probably limiting factors of competitive populations as predator reduvids, was confirmed with these observations. it seems that the alteration of natural ambient is quite favorable for triatoma sordida. so, the possibility of increasing human dwellings infestation by this bug is considered.
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