| soluble trehalase from panstrongylus megistus burm.(reduviidae, triatominae). | | 1979 | 37553 |
| [ecological aspects of south american trypanosomiasis. xii. regional variation in the trend of panstrongylus megistus toward appearance in domiciles]. | | 1978 | 102020 |
| house construction, triatomine distribution, and household distribution of seroreactivity to trypanosoma cruzi in a rural community in northeast brazil. | household distribution of seroreactivity to trypanosoma cruzi in inhabitants was analyzed in relation to house construction and the distribution of panstrongylus megistus, the principal domestic vector of chagas' disease in a rural area in northeast brazil. no children residing in mud-brick houses were seroreactive to t. cruzi. the highest rates of seroreactivity occurred in residents of unplastered mud-stick houses, and were twice as high as those found in persons living in mud-brick houses or ... | 1978 | 103445 |
| trypanosoma cruzi infection in dogs and cats and household seroreactivity to t. cruzi in a rural community in northeast brazil. | the prevalence of trypanosoma cruzi parasitemia as determined by xenodiagnosis on domestic dogs and cats was correlated with household rates of seroreactivity to t. cruzi and household panstrongylus megistus infestation in a rural area in northeast brazil where p. megistus was the only domiciliary triatomine vector. t. cruzi infection was present in about 18% of domestic dogs and cats. two-thirds of seroreactive children below age 10 resided in houses with t. cruzi-infected animals. in houses wi ... | 1978 | 103446 |
| screening and structure-activity relationships of synthetic juvenile hormone analogues for panstrongylus megistus, a primary vector of chagas' disease in brazil. | | 1978 | 110859 |
| [ecological aspects of south american trypanosomiasis. xiii. domestic enzootic potential in an area of occurrence of panstrongylus megistus, under epidemiological surveillance]. | | 1978 | 111341 |
| an outbreak of acute chagas's disease in the são francisco valley region of bahia, brazil: triatomine vectors and animal reservoirs of trypanosoma cruzi. | following reports of an unusually high incidence of acute chagas's disease and the appearance of large numbers of triatoma infestans in the southwestern region of the state of bahia, triatomine bugs (hemiptera: reduviidae) and domestic animals in one of the affected communities were surveyed and examined for infection with trypanosoma cruzi. triatoma infestans was prevalent in houses and was also found in peridomestic habitats. t. sordida and t. pseudomaculata occupied peridomestic and sylvatic ... | 1979 | 120045 |
| [ecological aspects of south american trypanosomiasis. xv. development, variation and permanence of triatoma sordida, panstrongylus megistus and rhodnius neglectus in artificial ecotopes]. | | 1979 | 120606 |
| [ecologic aspects of south american trypanosomiasis. xvi - dispersion and annual cycles of triatoma sordida and panstrongylus megistus colonies spontaneously developing in artificial ecotopes]. | | 1979 | 121489 |
| [cytochemical studies of structural proteins, neutral and acid glycosaminoglycans, rna and calcium in the malpigian tubules of panstrongylus megistus (burmeister)]. | | 1977 | 343194 |
| [studies on reservoirs and wild vectors of trypanosoma cruzi. lxvi: evolution cycle of trypanosoma cruzi in hemocel of panstrongylus megistus]. | | 1977 | 343195 |
| [panstrongylus megistus leucofasciatus lucena, 1950 and rhodnius nasutus stal, 1859 (hemiptera: triatominae), in pernambuco, brazil]. | | 1977 | 345393 |
| [reservoirs and wild vectors of trypanosoma cruzi. lxvii: various aspects of the behavior of different t. cruzi strains in the coelomic cavity of panstrongylus megistus]. | | 1978 | 353908 |
| human behaviour and the propagation of chagaś disease. | during 12 months, 26 households with 172 residents in são felipe, bahia, brazil, entertained 74 different guests who were potentially exposed to attack by panstrongylus megistus for an average of about 23 nights per guest per year. during the same period 52 of the residents spent an average of about two weeks a year away from home. these exchanges established contact with 79 other households in the district. these and other observations reinforce the opinion that human behaviour plays an importa ... | 1976 | 402723 |
| the identification by isoenzyme patterns of two distinct strain-groups of trypanosoma cruzi, circulating independently in a rural area of brazil. | culture forms of 17 trypanosoma cruzi stocks, primarily isolated from a rural area of endemic chagas disease at são felipe, bahia, brazil, were compared by the electrophoretic patterns of six enzymes: aspartate aminotransferase, alanine aminotransferase, glucose-6-phosphate dehydrogenase, malate dehydrogenase (decarb-oxylating) (nadp+), glucosephosphate isomerase and phosphoglucomutase. two markedly distinct combinations of isoenzyme patterns were seen, justifying the arrangement of the 17 stock ... | 1977 | 407674 |
| [ecological aspects of trypanosomiasis americana. ix. variation and mobility of panstrongylus megistus in artificial ecotopes]. | | 1977 | 410091 |
| [ecological aspects of south american trypanosomiasis. i. population data of panstrongylus megistus and triatoma sordida colonies spontaneously developed in artifical ecotopes]. | | 1977 | 414350 |
| comparative xenodiagnosis with three triatomine species of different hosts with natural and experimental chronic infections with trypanosoma (schizotrypanum) cruzi. | simultaneous xenodiagnosis was made of 29 patients with chronic chagas's disease, six naturally infected opossums (didelphis azarae) and of a rhesus monkey with an experimental chronic infection with trypanosoma (schizotrypanum) cruzi (peru strain). patients and opossums were from an endemic area in the state of bahia, brazil, where panstrongylus megistus is the sole domiciliary vector of the disease to man. various instars of p. megistus triatoma infestans and rhodnius prolixus were used. the p ... | 1978 | 416525 |
| a comparison of rhodnius prolixus, triatoma infestans and panstrongylus megistus in the xenodiagnosis of a chronic trypanosoma (schizotrypanum) cruzi infection in a rhesus monkey (macaca mullatta). | fifth instar rhodnius prolixus, triatoma infestans and panstrongylus megistus were fed on a rhesus monkey (macaca mullatta) with a chronic infection of peru strain trypanosoma cruzi and examined 30 days later for the presence of trypanosomes in the rectum. no correlation could be demonstrated between either blood meal size or sex and the subsequent development of a rectal infection with t. cruzi. as t. infestans and p. megistus were more highly infected than r. prolixus in terms of both percenta ... | 1975 | 814658 |
| [endocrine control of oogenesis during the fifth nymphal stage of panstrongylus megistus (hemiptera, heteroptera: reduviidae)]. | cautery of the neurosecretory cells of the pars intercerebralis, 48 hrs after feeding, of panstrongylus megistus fifth instar, prevents the development of the ovaries, and stops the physiological processes that lead to the differentiation of oögonies into primary oöcytes. | 1976 | 817816 |
| [on the finding of panstrongylus megistus in the cambe province of the parana state, brazil]. | | 1976 | 819987 |
| [histophysiology of the neurosecretory cells of the pars intercerebralis of larval female panstrongylus megistus (heteroptera: reduviidae)]. | important changes in the amount of neurosecretory material in the a and a' cells of the parsintercerebralis during the fifth instar intermoult of p. megistus occur. the release of neurosecretory material at different moments of intermoult, suggests that the a cells induce mitosis and that meiosis is induced by the release of a' cells material. | 1976 | 825256 |
| [the role of the pars intercerebralis during the fifth larval instar of panstrongylus megistus (heteroptera, reduviidae)]. | ovarian phenomena of mitosis and meiosis are both under cerebral endocrine control, but their determinism is not the same. the critical period of meiosis coincides with that of the imaginal moult, whereas the critical period of mitosis is precocious. implants of brains, re-establish the ovarian evolution stopped by electrocoagulation of the pars intercerebralis. | 1976 | 825300 |
| [changes in the level of ecdysones in the last 2 instars of panstrongylus megistus (heteroptera: reduviidae)]. | the ecdysone titre in the hemolymph during the two last instars of p. megistus was studied by radio-immunology technique. changes observed are very similar in both instars. two peaks of inequal amplitude are present. the first, always lower than the second, occurs at 1/3 of the intermoult whereas the second, distinctly higher, is observed at 2/3 period of the intermoult. | 1976 | 826342 |
| the threat of reintroduction of natural transmission of chagas' disease in bambuí, minas gerais state, brazil, due to panstrongylus megistus. | in the epidemiological surveillance program in the county of bambuí, minas gerais, between august 1986 and december 1988, 154 panstrongylus megistus were captured by the local population in both peridomicile and intradomicile environments. fifteen (9.8%) of the p. megistus harboured trypanosoma cruzi. precipitin tests showed that the most frequent triatomine blood meal sources were birds, but other sources were dogs, men and cats. the isoenzyme characterization of 13 t. cruzi strains showed that ... | 1992 | 1308572 |
| [the prevalence, infection indices and feeding habits of the triatominae captured in an area of epidemiological surveillance]. | prevalence of triatomines and their infection by trypanosoma cruzi, were studied during 1974-1981, in the administrative region of campinas, são paulo, brazil. this investigation was continued (1982-1986), blood meal tests with bird, marsupial, rodent and human antisera having been added. panstrongylus megistus, predominant in the region, whose winged instars are often found infected by t. cruzi in inhabited houses, displayed and alimentary eclecticism. from a sample of 7,785, 14.78 percent reac ... | 1992 | 1308951 |
| a simple method for detection of monoclonal isotypes. | a simple rapid method of enzyme labeled anti-isotype assay (elia) for detection of monoclonal isotype on hybridoma cells is proposed. this alternative method was first carried out on hybridoma cell lines 147c11 and 257c11 produced against trypanosoma cruzi and male accessory secretion of panstrongylus megistus, respectively. the monoclonal antibodies produced by these hybridoma were characterized by this method as igm (147c11) and igg1 (257c23) isotypes, allowing evaluation of isotype without ha ... | 1992 | 1444357 |
| lethality of triatomines (hemiptera: reduviidae), vectors of chagas' disease, feeding on blood baits containing synthetic insecticides, under laboratory conditions. | a laboratory study was conducted to test the toxicity of synthetic insecticides added to defibrinated sheep blood kept at room temperature and offered as food to the following triatomine species: triatoma infestans, panstrongylus megistus, triatoma vitticeps, triatoma pseudomaculata, triatoma brasiliensis and rhodnius prolixus. the insecticides used, at a concentration of 1 g/l, were: hch, ddt, malathion and trichlorfon, and the lethalithy observed at the end of a 7-day period varied according t ... | 1991 | 1726952 |
| partial purification and some properties of a hemolymph lectin from panstrongylus megistus (hemiptera, reduviidae). | hemagglutinating activity was studied in homogenates of three embryonic stages, and in the hemolymph of most instar larvae and in adult insects of panstrongylus megistus, an important chagas' disease vector in brazil. a hemolymph lectin from the 5th instar larvae of p. megistus was purified through a biospecific adsorption by using formaldehyde-treated erythrocytes. the lectin fraction was desorbed with 0.2m d-galactose in 0.15m nacl. the lectin fraction activity was inhibited by l-rhamnose, d-l ... | 1991 | 1796814 |
| scanning electron microscopy of the dorsal vessel of panstrongylus megistus (burmeister, 1835) (hemiptera: reduviidae). | in this study we analyzed the microanatomy of the dorsal vessel of the triatomine panstrongylus megistus. the organ is a tubule anatomically divided into an anterior aorta and a posterior heart, connected to the body wall through 8 pairs of alary muscles. the heart is divided in 3 chambers by means of 2 pairs of cardiac valves. a pair of ostia can be observed in the lateral wall of each chamber. a bundle of nerve fibers was found outside the organ, running dorsally along its major axis. a group ... | 1991 | 1842396 |
| the importance of the opossum (didelphis albiventris) as a reservoir for trypanosoma cruzi in bambuí, minas gerais state. | in a survey realized on the sylvatic and peridomestic environments at bambuí county, minas gerais state, 44 (37.9%) out of 116 opossums (didelphis albiventris) captured were found to be naturally infected with trypanosoma cruzi. one hundred and forty three parasite samples were obtained from 43 infected opossums using simultaneously hemoculture, xenodiagnosis (triatoma infestans, panstrongylus megistus and rhodnius neglectus) and examination of anal glands contents. the parasite samples were cha ... | 1991 | 1842405 |
| [behavior of trypanosoma cruzi strains after passage in different triatominae species]. | to study the influence of the intermediate host stage on the course of mouse infection, trypanosoma cruzi belonging to the peruvian (type i), 12 sf (type ii) and colombian (type iii) strains were passaged through either rhodnius prolixus, panstrongylus megistus or triatoma infestans. t. cruzi metacyclic forms (dose 10(4)) from the different strains were obtained from each bug and inoculated into 8-10 gm mice. comparison was made in mice inoculated with blood forms. parasitaemia curves were plott ... | 1991 | 1845005 |
| [aspects of "bug reporting" activity by the population in the control of panstrongylus megistus in 12 countries of the northwestern region of são paulo state, brazil, 1974 to 1983]. | the importance of "bug reporting", on the part of the local human population, to the epidemiological surveillance of chagas' disease in s. paulo state is demonstrated. the variations the number of "bug reports" from the local human population in the period from 1974 to 1983 relating to an area, infested by panstrongylus megistus, in the northeast of s. paulo state are studied. an increase in the number of "bug reporting" occurring in october, november and december was observed; however, no conne ... | 1990 | 2129403 |
| [determinants of the process of domiciliary infestation by panstrongylus megistus: the role of housing and deforesting]. | this study investigates the housing conditions and deforesting in caconde and são josé do rio pardo, neighbouring towns located in the northeastern region of the state of são paulo, brazil. these localities have had different dwelling infestation rates by panstrongylus megistus and they also show distinct socioeconomic development. the housing conditions were studied by the analysis of data collected during the 1970's by the superintendência de controle de endemias (sucen), a government agency. ... | 1990 | 2135491 |
| the hemocytes of panstrongylus megistus (hemiptera: reduviidae). | five hemocyte types were identified in the hemolymph of panstrongylus megistus by phase contrast and common light microscopy using some histochemical methods. these are: prohemocytes, small cells presenting a great nucleus/cytoplasm ratio; plasmatocytes, the most numerous hemocytes, are polymorphic cells mainly characterized by a large amount of lysosomes; granulocytes, hemocytes very similar to plasmatocytes which contain cytoplasmic granules and are especially rich in polysaccharides; oenocyto ... | 1987 | 2467168 |
| [isolation of trypanosoma cruzi samples by xenodiagnosis and hemoculture from patients with chronic chagas' disease]. | fifty nine chronic chagasic patients were simultaneously submitted to xenodiagnosis and hemoculture for trypanosoma cruzi samples isolations. the xenodiagnosis was done with 40 panstrongylus megistus, triatoma infestans and dipetalogaster maximus nymphs, performing 120 triatomines. groups of 10 insects per specie were dissecated and the intestinal content pooled and examined, after previous trituration and homogenization. the microscopically negative material was seed into lit medium and examine ... | 1989 | 2517566 |
| chagas' disease and its insect vector. effect of azadirachtin a on the interaction of a triatomine host (rhodnius prolixus) and its parasite (trypanosoma cruzi). | the ed50 for moulting inhibition by injected azadirachtin a is for fourth instar larvae of all the triatomines, triatoma vitticepes, t. pseudomaculata, t. maculata, t. brasiliensis, t. lecticularis, t. matogrossensis, t. infestans, rhodnius prolixus. r. neglectus, r. robustus, panstrongylus megistus, and p. herrera in the range of 10-25 ng/larva. in rhodnius prolixus, the survival of t. cruzi was studied after treatment with the drug. if the trypomastigotes were fed in presence of 1.0 microgram ... | 1989 | 2663004 |
| ultrastructural studies of the hemocytes of panstrongylus megistus (hemiptera: reduviidae). | ultrastructural analyses revealed the presence of six hemocyte types in the hemolymph of panstrongylus megistus, partially confirming our previous results obtained through light microscopy. prohemocytes: small, round hemocytes with a thin cytoplasm layer, especially rich in free ribosomes and poor in membranous systems. plasmatocytes: polymorphic cells, whose cytoplasm contains many lysosomes and a well developed rough endoplasmic reticulum (rer). they are extremely phagocytic. sometimes, they s ... | 1989 | 2699754 |
| [ultrastructural aspects of the corpus cardiacum, corpus allatum and aorta of panstrongylus megistus (hemiptera: reduviidae)]. | | 1988 | 3070650 |
| natural lectin activity in the haemolymph of panstrongylus megistus (heteroptera: reduviidae). | the haemolymph of panstrongylus megistus showed a natural lectin activity for a wide range of vertebrate erythrocytes. agglutination was observed against all vertebrate erythrocytes tested (human abo, duck, rabbit, mouse, sheep, chicken and cow). cow erythrocytes showed the lowest titre. concerning human erythrocytes, the lectin activity was similar in the types a+, b+ and ab+ while the highest activity was observed in the type o+. determination of minimal inhibitory concentrations was carried o ... | 1988 | 3078350 |
| naturally occurring lectins in the haemolymph of panstrongylus megistus (hemiptera: reduviidae). | | 1988 | 3078352 |
| behavior of triatomines (hemiptera: reduviidae) vectors of chagas' disease. ii. influence of feeding, lighting and time of day on the number of matings, mating speed and duration of copulation of panstrongylus megistus (burm, 1835) under laboratory conditions. | to determine the influence of feeding, lighting and time of day on the copulating behavior of panstrongylus megistus, 480 insect pairs were divided into four groups of 120 each and tested in the following respective situations: without food deprivation (f.d.), with five days of f.d., with ten days of f.d., and with 20 days of f.d. the tests were performed between 9:00 a.m. to 12:00 a.m. and 7:00 p.m. to 10:00 p.m., with light (700-1400 lux) and in the dark (1.4-2.8 lux) and behavior was recorded ... | 1986 | 3112511 |
| value of first-instar triatomines (hemiptera; reduviidae) in comparative xenodiagnosis of trypanosoma (schizotrypanum) cruzi. | a direct correlation was shown between bloodmeal intake in xenodiagnosis and subsequent infection rate with trypanosoma (s.) cruzi, in first-stage nymphs of panstrongylus megistus burmeister. the parasitaemia of different hosts, or of the same host at intervals, thus can be compared indirectly by the proportion of first-stage nymphs infected in xenodiagnosis, if uniform distribution and infectivity of bloodstream trypomastigotes is assumed. this indirect comparison of host parasitaemia provides ... | 1987 | 3122205 |
| studies in search of a suitable experimental insect model for xenodiagnosis of hosts with chagas' disease. 2 attempts to upgrade the reliability and the efficacy of xenodiagnosis in chronic chagas' disease. | in order to upgrade the reliability of xenodiagnosis, attention has been directed towards population dynamics of the parasite, with particular interest for the following factors: 1. parasite density which by itself is not a research objective, but by giving an accurate portrayal of parasite development and multiplication, has been incorporated in screening of bugs for xenodiagnosis. 2. on the assumption that food availability might increase parasite density, bugs from xenodiagnosis have been ref ... | 1987 | 3147356 |
| electron microscope observations of trypanosoma cruzi during development inside the haemocytes of triatominae. | the haemolymph of panstrongylus megistus, infected by trypanosoma cruzi, was examined by light and electron microscopy. numerous parasites lie inside the haemocytes, each one in a vacuole. their well-preserved morphological features support the concept of parasite multiplication in cells of the insect haemolymph. | 1987 | 3318020 |
| behavior of triatomines (hemiptera: reduviidae) vectors of chagas' disease. iii. influence of the number of matings on the fecundity and fertility of panstrongylus megistus (burm., 1835) in the laboratory. | a study of the effect of mating in the fecundity and fertility of females of p. megistus fed on pigeon blood every 14 days, was carried out in the laboratory. two groups were constituted: i - females which mated only once; ii - females which stayed always with the males. only 56.7% of group i females laid fertile eggs, while as much as 90% of group ii females laid fertile eggs. the duration of the fertile oviposition was greater in the females which stayed always with the males. some females of ... | 1987 | 3333808 |
| behavior of triatomines (hemiptera:reduviidae) vectors of chagas' disease. iv. fecundity, fertility and longevity of panstrongylus megistus (burm., 1835) pairs and virgin females starved under laboratory conditions. | a laboratory study was conducted on the fecundity, fertility and life span of panstrongylus megistus pairs and on the fecundity and life span of p. megistus virgin females submitted to starvation after the last moulting. of the mated females, 22.2% laid eggs, 4.4% of which were fertile. females resisted starvation more than males. of the starved virgin females, only 10% laid eggs, with a low egg-laying rate (0.47) per female. resistance to starvation was lower in virgin than in mated females. | 1987 | 3333945 |
| secretory activity and endocrine regulation of male accessory glands in the blood-sucking bug panstrongylus megistus (hemiptera: reduviidae). | the epithelial cells of panstrongylus megistus male accessory glands (mag) present ultrastructural characteristics of a secretory cell. their secretory products are accumulated in the lumen of the four mag lobes. during the first 8 days of adult life a strong secretion activity occurs, accumulating enough material to produce the first spermatophore. cerebral neurosecretions as well as juvenile hormone are both involved in mag secretory activity regulation. juvenile hormone seems to be the respon ... | 1987 | 3334404 |
| behavior of triatomines (hemiptera: reduviidae) vectors of chagas' disease. i. courtship and copulation of panstrongylus megistus (burm., 1835) in the laboratory. | a study of the courtship and copulation behavior of panstrongylus megistus was carried out in the laboratory. fifty-five newly-fed virgin couples were used. experiments were performed during the day (9:00 to 12:00 a.m.) and at night (7:00 to 10:00 p.m.). behavior was recorded by direct observation and was found to consist of the following sequence of behavioral patterns: the male approached the female and jumped on her or mounted her; he took on a dorsolateral position and immobilized the female ... | 1986 | 3540526 |
| trypanosoma cruzi: kinetics of metacyclogenesis in adult and nymphal panstrongylus megistus. | adult triatomine insects, panstrongylus megistus, naturally infected with the protozoa, trypanosoma cruzi, contained significantly more metacyclic trypomastigote forms in their digestive tracts than did p. megistus nymphs. metacyclics were scarce in all stages of triatomines fed once on infected mammalian hosts and subsequently starved. in contrast, triatomines fed repeatedly on infected mammalian hosts developed prolific t. cruzi infections. repeatedly fed adults contained 14 x more metacyclics ... | 1985 | 3918882 |
| trypanosoma cruzi: association between seroreactivity of children and infection rates in domestic panstrongylus megistus (hemiptera: reduviidae). | | 1985 | 3920395 |
| association between household triatomine density and incidence of trypanosoma cruzi infection during a nine-year study in castro alves, bahia, brazil. | we studied the association between human incidence of trypanosoma cruzi infection and household infestation density of panstrongylus megistus in castro alves, bahia, brazil. during a 9-year period, 19 persons seroconverted; 17 were children, 17 lived in nonplastered houses, and 13 lived in houses infested with triatomines. although 6 seroconverting persons lived in houses where triatomines could not be found, the risk of seroconversion was significantly greater in infested houses and 16 times gr ... | 1985 | 3929635 |
| [natural infection of panstrongylus megistus (burmeister, 1835) by trypanosoma rangeli (tejera, 1920) in the interior of the state of alagoas]. | | 1973 | 4201998 |
| the host selection pattern and infection rates of panstrongylus megistus in an area of eastern brazil. | | 1973 | 4206115 |
| octosporea carloschagasi n.sp., a microsporidian associate of trypanosoma cruzi in panstrongylus megistus. | | 1972 | 4560463 |
| letter: syncytial masses in panstrongylus megistus naturally infected with trypanosoma cruzi. | | 1974 | 4617350 |
| [monthly variations of the incidence of the evolution forms of triatoma infestans and panstrongylus megistus in the community of bambui, state of minas gerais (ii: 1951-1964)]. | | 1968 | 4908873 |
| [ecological aspects of american trypanosomiasis. i. findings of panstrongylus megistus and its relation to the natural foci of the infection, in the urban area of são paulo city, brazil]. | | 1970 | 4990136 |
| host availability limits population density of panstrongylus megistus. | in order to determine whether host availability limits triatomine population growth, 5th-stage panstrongylus megistus were maintained in feeding chambers containing 0, 1, 2, or 3 mice. during the 5-day feeding period, triatomines exposed to two or three mice gained significantly more weight than did bugs exposed to one mouse. in addition, half of the bugs exposed to two or three mice molted, as compared to one-fifth of the p. megistus exposed to one mouse. thus, weight gain and molting were rela ... | 1983 | 6359911 |
| the development of extra-intestinal cycle of trypanosoma cruzi in triatoma infestans and panstrongylus megistus. | by applying various histological techniques the results obtained were similar to those in lacombe's previous publications referring to the development of trypanosoma cruzi in haemolymph, the later penetration in the malpighian tubes and their return to the digestive tract. trypomastigotes and sphaeromastigotes are found in the promesenteron after two hours of feeding the insect with mice blood containing numerous trypanosoma cruzi. some parasites move to the promesenteron from postmesenteron and ... | 1984 | 6385793 |
| [ecological aspects of south american trypanosomiasis. xix - development of regional triatominae domiciliation in an endemic center of panstrongylus megistus]. | | 1983 | 6426031 |
| [ecological aspects of south american trypanosomiasis. xx-- development and annual cycles of panstrongylus megistus colonies in artificial ecotopes, in peri- and extradomiciliary environments]. | | 1984 | 6427912 |
| [the ecotopy of panstrongylus megistus (hemiptera, reduviidae) in the horto forest (rio de janeiro)]. | | 1982 | 6753051 |
| [house colonization of panstrongylus megistus in the southern coastal region of the state of são paulo, brazil]. | | 1982 | 6755643 |
| [morphological changes induced by the use of precocene ii in panstrongylus megistus (burmeister, 1835), (hemiptera, reduviidae, triatominae)]. | | 1982 | 6763731 |
| structure-activity relationships of 110 candidate juvenile hormone analogues for panstrongylus megistus (burmeister, 1835), a vector of chagas' disease (hemiptera, reduviidae, triatominae). | | 1981 | 6791245 |
| alterations in the morphology of the external genitalia of panstrongylus megistus (burm., 1835), caused by treatment with a juvenile hormone analogue (hemiptera, reduviidae, triatominae). | | 1981 | 7022578 |
| [feeding and defecation dynamics of triatoma sordida]. | today, triatoma sordida is the most frequently captured triatomine in brazil. for a better understanding of its vectorial potential, its feeding dynamics and dejections behaviour were studied in comparison with triatoma infestans and p. megistus. the proportion of t. sordida and t. infestans that blood fed on anaesthetized rats did not differ significantly. there was no significant difference in the time elapse between release of the bugs and the initiation of blood feeding. the mean time betwee ... | 1995 | 7480912 |
| possible absence of attraction to odor in panstrongylus megistus (hemiptera: reduviidae) under laboratory conditions. | we tested the attraction of panstrongylus megistus odor under laboratory conditions, between males and females of this species and by individuals of each sex on recently fed virgin couples. we employed a system of choice boxes both with or without forced aeration. we observed no differences between the experimental groups with or without aeration over the stimuli in the tested situations. we also observed a clear trend among the insects to remain in the central box where they had been placed in ... | 1994 | 7885256 |
| [colonization of artificial ecotopes by panstrongylus megistus in santa catarina island, florianópolis, santa catarina, brazil]. | the aim of this work was to verify the colonization of panstrongylus megistus on artificial ecotopes in florianópolis, in the santa catarina island, south brazil. for this purpose 443 houses of the lagoa district and 779 house annexes (524 chicken-houses, 46 corrals and 209 storage-houses) in 9 different places were examined from 1985 to 1992. these ecotopes, which include ceilings and basements, were checked after application of dislodging liquid (pirisa 5%). colonization by p. megistus was ver ... | 1994 | 7997773 |
| randomly amplified polymorphic dna (rapd) and isoenzyme analysis of trypanosoma rangeli strains. | sixteen trypanosoma rangeli strains were compared by isoenzyme and randomly amplified polymorphic dna (rapd) analysis. eight strains were isolated from either rhodnius prolixus or homo sapiens from honduras, colombia and venezuela. another eight strains were isolated from either panstrongylus megistus or the rodent echimys dasythrix from the state of santa catarina, southern brazil. all six t. rangeli strains isolated from p. megistus were co-infections with trypanosoma cruzi, demonstrating an o ... | 1994 | 8049688 |
| effects of gamma irradiation on the reproductive capacity and the longevity of panstrongylus megistus (hemiptera: reduviidae). | the effects of radiation on the reproductive capacity and the longevity of panstrongylus megistus were studied. an indirect correlation between longevity and radiation doses was observed. males were more affected than females. longevity of females submitted to 10 gy was not different when compared to controls. some of the irradiated males copulated and in these cases semen was transferred to females, but only few eggs were laid. fertility was seriously affected in all irradiated groups, decreasi ... | 1993 | 8107580 |
| inter-relation of sylvatic and domestic transmission of trypanosoma cruzi in areas with and without domestic vectorial transmission in minas gerais, brazil. | during the period 1980-1986, we captured triatomine bugs and mammalian reservoir hosts from sylvatic and domestic situations in different municipalities of the state of minas gerais. trypanosoma cruzi was isolated from captured bugs, mammals and patients. after cultivation in lit medium, the electrophoretic enzyme profiles were determined. we obtained a total of 32 parasite isolates from regions with active domestic transmission, and 24 isolates from areas under control. for the first areas the ... | 1995 | 8551947 |
| triatoma infestans is more efficient than panstrongylus megistus in obtaining blood meals on non anaesthetized mice. | we compared the influence of bug density in the capacity of triatoma infestans and panstrongylus megistus in obtaining blood meal in non anaesthetized mice. the regression analysis for increase in body weight (mg) versus density (no. of bugs/mouse) showed that in experiments with anaesthetized mice (am), no correlation was observed. in experiments with non anaesthetized mice (nam) the weight increase was inversely proportional to density. the regression slope for blood meal size on density was l ... | 1995 | 8731374 |
| [xenodiagnosis in chronic chagas' disease. i. the sensitivity of panstrongylus megistus and triatoma infestans]. | from january 1986 to february 1994, 563 xenodiagnosis (xd) were applied in 563 chronic chagasic patients from different areas of brazil; 292 were women and 271 were men between 6 and 89 years (average: 41.4 +/- 14.7 years). to each xd 40 nymphs on the 4th stage were used: 20 from panstrongylus megistus (pm) and 20 from triatoma infestans (ti) in fast, during at least 14 days. the exam in each nymph was made 45 days after being applied on the patient, by observation in optical microscopy of the d ... | 1996 | 8768582 |
| biological and isoenzymatic characterization of trypanosoma cruzi strains isolated from sylvatic reservoirs and vectors from the state of santa catarina, southern brazil. | sixty eight trypanosoma cruzi strains were isolated in the state of santa catarina, southern brazil, from sylvatic reservoirs or naturally infected vectors and characterized by their biological behaviour in mice, morphology of bloodstream forms and isoenzyme profiles. twenty eight strains were isolated from the triatomine bug (panstrongylus megistus), 2 from rodents (echimys dasythrix and akodon sp) and 38 from opossums (didelphis marsupialis). the infectivity in mice of 48 t. cruzi strains show ... | 1995 | 8907395 |
| [the finding of panstrongylus megistus in an artificial ecotope: taking up residence or merely visiting?]. | as a first measure of chagas' disease control in brazil with chemical elimination of the most important vector of the disease, triatoma infestans was removed. attention is now being paid to triatoma sordida and panstrongylus megistus. that species can eventually be found inside houses, as happened with the specimens we examined from bernardino de campos and sete barras, all of them infected by trypanosoma cruzi. these data suggest that a better knowledge about the behavior that species is needed ... | 1997 | 9265230 |
| [triatomids and forest reservoirs of trypanosoma cruzi in the state of paraná, southern brazil. preliminary results]. | in the rural area of five municipalities of the northeast of the state of paraná, brazil, 154 adults or nymphs of triatoma sordida and 2 panstrongylus megistus were captured in 21 (41.2%) of 51 dwellings at the peridomestic sites. trypanosoma cruzi-like organisms were found in 58 out of the 135 (43.0%) triatomids. moreover, it was also found in the blood of 4/7 opossum (didelphis sp). the triatomine infestation was more prevalent in the peridomicile than inside house. the forsaken wooden house p ... | 1997 | 9273566 |
| attempts to improve xenodiagnosis: comparative test of sensibility using rhodnius neglectus, panstrongylus megistus, triatoma vitticeps and triatoma infestans in endemic areas of brazil. | from june 1984 to july 1992, 392 xenodiagnostic tests were applied on 264 patients with chronic chagas disease from brazilian endemic areas of virgem da lapa and coronel murta, situated in the jequitinhonha valley, in the state of minas gerais. the susceptibilities of rhodnius neglectus, panstrongylus megistus, triatoma vitticeps and triatoma infestans were compared. most of the time 20 nymphs (fourth instar) of each species were applied to 161 women and 103 men aged between 5 and 83 years of ag ... | 1997 | 9302418 |
| characterization of trypanosoma cruzi strains isolated from chronic chagasic patients, triatomines and opossums naturally infected from the state of rio grande do sul, brazil. | thirty-five trypanosoma cruzi strains were isolated from chronic chagasic patients, triatomines and opossums from different municipalities of the state of rio grande do sul. parasites were characterized by means of mice infectivity, enzyme electrophoresis and randomly amplified polymorphic dna (rapd) analysis. twenty-nine strains were isolated from chagasic patients, 4 from triatomines (2 from triatoma infestans and 2 from panstrongylus megistus) and 2 from opossums didelphis albiventris. thirty ... | 1997 | 9332599 |
| random amplification of polymorphic dna as a tool for taxonomic studies of triatomine bugs (hemiptera: reduviidae). | eleven of 27 decameric primers were found to be suitable for random amplification of polymorphic dna (rapd) from triatomine bugs on the basis that they produced discrete profiles and distinguished among panstrongylus megistus (burmeister), rhodnius prolixus stål, and triatoma infestans (klug). the legs, or single leg segments, of individual bugs were used as the source of dna so that the taxonomic value of the bug was conserved. within the scope of the specimens studied, rapd profiles allowed as ... | 1998 | 9542343 |
| the effect of azadirachtin on fresh isolates of trypanosoma cruzi in different species of triatomines. | the effect of azadirachtin was investigated using three different fresh isolates of trypanosoma cruzi and five different triatomine species which were infected as third-instar larvae. the two t. cruzi strains which originated from sylvatic triatoma vitticeps showed a high prevalence after the molt to the fifth instar in panstrongylus megistus and rhodnius neglectus and a low prevalence in triatoma infestans and rhodnius robustus. the third t. cruzi strain originating from a patient in piaui show ... | 1998 | 9569093 |
| phylogeny of species of triatoma (hemiptera: reduviidae) based on mitochondrial dna sequences. | dna sequence comparisons of 12s, 16s, and coi mitochondrial dna (mtdna) genes were used to infer phylogenetic relationships among 8 species of triatoma [7 belonging to the infestans complex and t. circummaculata (stål), a member of a different complex based on morphology]. there was remarkable mtdna similarity between t. infestans (klug) and t. platensis neiva that can be explained by mtdna introgression. evolutionary trees were constructed using panstrongylus megistus (burmeister) as the outgro ... | 1998 | 9615540 |
| effect of fasting on the composition of the fat body lipid of dipetalogaster maximus, triatoma infestans and panstrongylus megistus (hemiptera: reduviidae). | modifications in content and lipid composition induced by fasting were examined in fat bodies from adults of triatominae, dipetalogaster maximus, triatoma infestans and panstrongylus megistus. with fasting, total lipid stores dropped approximately 50% for t. infestans and more than 70% for p. megistus. total lipids analyzed by thin layer chromatography and fractionated by column chromatography on unisil showed triacylglycerols as the main component in the three species, although p. megistus show ... | 1998 | 9810719 |
| differences in saliva composition among three brazilian populations of panstrongylus megistus (hemiptera, reduviidae). | comparisons of electrophoretic profiles of triatomines (panstrongylus megistus) from the brazilian states of bahia (ba), minas gerais (mg) and santa catarina (sc) revealed differences in the composition of the saliva between the three populations. a phenogram constructed on the basis of the most representative electrophoretic banding patterns allowed the specimens tested to be divided into two groups. the ba and sc populations could be completely separated while some individuals from mg could be ... | 1999 | 9924964 |
| [chagas' disease in são paulo state: a comparative study between systematic search and inhabitants' report of bugs in the area under entomological surveillance]. | entomological surveillance of chagas' disease in são paulo state has adopted a scheme that uses the locality as a unit for field work. actions are prioritized according to infestation levels obtained by systematic search of triatomine (routine actions), bugs in areas with high infestation levels and in houses whose inhabitants report the presence of the bugs (reply to notification). the most prevalent triatominic species in sao paulo state at present are triatoma sordida and panstrongylus megist ... | 1999 | 10881102 |
| performance of yeast-baited traps with triatoma sordida, triatoma brasiliensis, triatoma pseudomaculata, and panstrongylus megistus in laboratory assays. | the effectiveness of a trap for triatomines baited with yeast cultures has been previously demonstrated for triatoma infestans in laboratory assays. we report here results from laboratory assays testing yeast traps for triatoma sordida, triatoma brasiliensis, triatoma pseudomaculata, and panstrongylus megistus. all assays were conducted in an open experimental arena 100 cm x 100 cm, with two traps placed at opposite sides of the arena. one of the traps contained a yeast culture, and the other tr ... | 2000 | 10949899 |
| trypanosoma cruzi infection in didelphis marsupialis in santa catarina and arvoredo islands, southern brazil. | between 1984 and 1993 the prevalence of the trypanosoma cruzi infection in opossums (didelphis marsupialis) was studied in santa catarina and arvoredo islands, state of santa catarina, brazil. the association of the triatomine bug panstrongylus megistus with opossums nests and the infection rate of these triatomines by t. cruzi was also studied. thirteen different locations were studied in santa catarina island (sci), in which 137 d. marsupialis were collected. sixty two opossums were collected ... | 2000 | 11080763 |
| [chagas disease in brazil]. | this article presents the current situation for chagas disease vectors in brazil, based on data from the brazilian national health foundation (fns). over the course of the last 20 years, continuous chemical control has resulted in a clear reduction of triatomine densities and trypanosoma cruzi in brazilian dwellings. results have been particularly promising in relation to triatoma infestans and panstrongylus megistus, considered the most important species in the past. in parallel, data from scho ... | 2000 | 11119316 |
| [general situation and perspectives of chagas disease in northeastern region, brazil]. | primary and secondary data show the importance and distribution of human chagas disease (hcd) in northeast brazil. among the 27 detected vector species, triatoma infestans, panstrongylus megistus, triatoma brasiliensis and triatoma pseudomaculata are epidemiologically important. major medical impact is attributed to t. infestans and p. megistus, the most domiciliated and vulnerable species, while the other two are native and more difficult to control. regional differences in transmission and med ... | 2000 | 11119317 |
| effect of sequential cold shocks on survival and molting incidence in panstrongylus megistus (burmeister) (hemiptera, reduviidae). | the survival and molting incidence were studied in the insect, panstrongylus megistus, following sequential cold shocks in which a milder shock at 0 or 5 degrees c for 1 h preceded a more severe shock (0 degrees c, 12 h). the shocks were separated by intervals of 8, 18, 24, and 72 h at 28 degrees c. the survival rate after sequential shocks was identical to that of unshocked controls. cold-shock tolerance differed from heat-shock tolerance since the latter varied with the time between shocks and ... | 2001 | 11336492 |
| experimentally induced heat-shock tolerance in panstrongylus megistus (hemiptera: reduviidae). | the survival and molting incidence of fifth-instar nymphs of panstrongylus megistus (burmeister, 1835), a vector of chagas' disease, were investigated following sequential heat shocks in which a mild shock (35 or 40 degrees c, 1 h) preceded a more drastic one (40 degrees c, 12 h). the shocks were separated by 8-, 18-, 24-, or 72-h periods at 28 degrees c. the heat-shock tolerance response was more effective when the first shock was given at 40 degrees c. when the period between shocks was 18 h, ... | 2001 | 11476330 |
| [detection of triatomines (hemiptera: reduviidae) in domiciliary and extra-domiciliary ecotopes. corrientes, argentina. ]. | in order to identify intra- and extra-domiciliary triatomines, a study in different counties of corrientes province, argentina, was conducted from 1985 to 1995. triatoma infestans (klug, 1834), triatoma sordida (stål, 1859), panstrongylus geniculatus (latreille, 1811), and panstrongylus megistus (burmeister, 1835) were detected in domestic ecotopes. t. infestans and t. sordida were also found in the peridomicile. triatoma platensis (neiva, 1913), psammolestes coreodes (bergroth, 1911), t. sordid ... | 2001 | 11514865 |
| secondary triatomine species in dwellings and other nearby structures in municipalities under epidemiological surveillance in the state of paraná, brazil. | since data are scarce regarding secondary triatomine species in the brazilian state of paraná, this study investigated infestations in inhabited and abandoned houses and in various other nearby structures in rural areas of that state. | 2001 | 11550581 |
| mitochondrial dna sequences of triatomines (hemiptera: reduviidae): phylogenetic relationships. | the phylogenetic relationships among 18 species of triatominae were inferred based on mitochondrial dna (mtdna) sequences. the species of triatoma included 11 belonging to the infestans complex [t. infestans (klug), t. guasayana wygodzinsky & abalos, t. sordida (stål), t. platensis neiva, t. brasiliensis neiva, t. rubrovaria (blanchard), t. vitticeps (stål), t. delpontei romaña & abalos, t. maculata (erichson), t. patagonica del ponte, and t. matogrossensis leite & barbosa] and four others of th ... | 2001 | 11580040 |
| [panstrongylus megistus in artificial ecotopes on islands of the paraná river]. | in response to complaints of triatomines on islands of the alto paraná river, an investigation to determine the presence of triatomines was conducted in 145 artificial ecotopes and 4 (2.8%) were infested, comprising a residence, a sports and leisure club, a former school and a woodpile. of the 35 p. megistus collected, 17 were analyzed and 12 (70.6%) were found to be infected with trypanosoma cruzi. birds and rodents were the most common food sources. all serologic examinations (56 human, 18 dog ... | 2001 | 11600918 |
| kdna markers define two major trypanosoma rangeli lineages in latin-america. | trypanosoma rangeli is a hemoflagellate parasite of man, domestic and wild animals in central and south america. the genus rhodnius is particularly susceptible to infection by t. rangeli and transmission by salivary inoculation has been demonstrated in 12 of 14 nominal species of naturally and experimentally infected insects. this report describes the molecular characterization of 37 strains of t. rangeli isolated from vertebrate and invertebrate hosts. strains were analyzed by hybridization wit ... | 2002 | 11755434 |
| [the use of insecticide fumigant canister to protect an insectarium and its residual effect against triatomine bugs, in laboratory conditions]. | an insecticide fumigant canister based on synthetic pyrethroids and dichlorvos was employed against cockroaches and ants which were invading an insectarium used for rearing triatominae. after removal of the triatominae, the canister was activated and found to kill all the invading insects within 48 hours. possible residual action against triatomines was then monitored by a 24-hour exposure of eggs, nymphs and adults of triatoma infestans, panstrongylus megistus and rhodnius neglectus in the trea ... | 2001 | 11813055 |
| [chagas' disease in lassance, minas gerais state: clinical-epidemiological re-evaluation ninety years after the discovery by carlos chagas]. | the history and present situation of chagas' disease in lassance (the county where carlos chagas discovered american trypanosomiasis) were studied through a historical analysis and clinical and epidemiological research performed from 1999 to 2001. lassance was an important focus of chagas' disease from carlos chagas up until the 1980's, because of intensive infestation in dwellings by panstrongylus megistus and triatoma infestans, two important species which were efficiently controlled in the la ... | 2002 | 12011926 |
| dynamics of thermopreference in the chagas disease vector panstrongylus megistus (hemiptera: reduviidae). | the thermopreference of resting p. megistus (burmeister, 1834) adults was studied in a temperature gradient. we also determined the thermopreference for oviposition and ecdysis. thermopreference of resting individuals depended on the feeding state of the insects. results demonstrated an initial resting preference of approximately 290 degrees c, which gradually changed to 26-27 degrees c with increasing starvation. a daily variation in thermopreference was also observed with this species. the ins ... | 2002 | 12349852 |