| acid phosphatase activity distribution in salivary glands of triatomines (heteroptera, reduviidae, triatominae). | acid phosphatase activity (gömori technique) in salivary gland cells was investigated in adult insects (males and females) of four species of triatomines: triatoma infestans, panstrongylus megistus, rhodnius neglectus, and rhodnius prolixus. binucleated cells with bulky and polyploidy nuclei were detected, with acid phosphatase activity in the heterochromatin and nucleolus, which showed the most intense response. thus, the activity of these phosphatases during rrna molecule transcription, possib ... | 2007 | 17469069 |
| 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 |
| cytochemical characterization of triatoma infestans and panstrongylus megistus salivary gland cells (hemiptera, reduviidae, triatominae). | the triatominae subfamily has medical sanitary importance, since these insects are vectors of trypanosoma cruzi, etiologic agent of chagas disease, and trypanosoma rangeli, which develops in the salivary glands and it is frequently found in mixed infections with t. cruzi. triatomines of triatoma and panstrongylus genera possess a salivary gland complex composed of a pair with three well differentiated units: the anterior (d1), median (d2) and posterior (d3). saliva is secreted during blood meal ... | 2008 | 18722780 |
| [colonization by panstrongylus megistus (hemiptera, reduviidae, triatominae) inside homes in são josé do cerrito, sc: first report]. | in response to complaints of the presence of triatomines in a fishing hut on the banks of the caveiras river, in the municipality of são josé do cerrito, state of santa catarina, an investigation was conducted in this hut and in other ecotopes neighboring the initial finding. fifteen specimens of panstrongylus megistus were found and none of them were infected. the locality of this ecotope is visited occasionally by capybaras, opossums, armadillos and rats. | 2008 | 18853021 |
| [evaluation of the chagas disease control program and presence of panstrongylus megistus in central-western minas gerais state, brazil]. | the brazilian national chagas disease control program (pcdch) is currently in the epidemiological surveillance phase and poses one of the principal challenges for maintaining and improving surveillance. with the decentralization of health actions, leading to the transfer of responsibilities over the control of endemic diseases to the state and municipal governments, some municipalities have faced difficulties in implementing the program, since they lack experience in controlling this disease. th ... | 2009 | 19347217 |
| the metasternal and brindley's glands of triatoma brasiliensis neiva (hemiptera: reduviidae). | triatoma brasiliensis neiva is the most important vector of the chagas' disease in the semiarid zones of north-eastern brazil. adult bugs have two main pairs of exocrine glands, the metasternal and the brindley's glands, which release volatiles possibly with defense, alarm and/or mating functions. to date, anatomical and histological studies of the metasternal and the brindley's glands in the genus triatoma are scarce and, considering the relevance of these exocrine glands, the present work aime ... | 2009 | 19488512 |
| 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 |
| biology, diversity and strategies for the monitoring and control of triatomines--chagas disease vectors. | despite the relevant achievements in the control of the main chagas disease vectors triatoma infestans and rhodnius prolixus, several factors still promote the risk of infection. the disease is a real threat to the poor rural regions of several countries in latin america. the current situation in brazil requires renewed attention due to its high diversity of triatomine species and to the rapid and drastic environmental changes that are occurring. using the biology, behaviour and diversity of tri ... | 2009 | 19753457 |
| immunogenic salivary proteins of triatoma infestans: development of a recombinant antigen for the detection of low-level infestation of triatomines. | triatomines are vectors of trypanosoma cruzi, the etiological agent of chagas disease in latin america. the most effective vector, triatoma infestans, has been controlled successfully in much of latin america using insecticide spraying. though rarely undertaken, surveillance programs are necessary in order to identify new infestations and estimate the intensity of triatomine bug infestations in domestic and peridomestic habitats. since hosts exposed to triatomines develop immune responses to sal ... | 2009 | 19841746 |
| the triatominae species of french guiana (heteroptera: reduviidae). | an annotated list of the triatomine species present in french guiana is given. it is based on field collections carried out between 1993-2008, museum collections and a literature review. fourteen species, representing four tribes and six genera, are now known in this country and are illustrated (habitus). three species are recorded from french guiana for the first time: cavernicola pilosa, microtriatoma trinidadensis and rhodnius paraensis. the two most common and widely distributed species are ... | 2009 | 20140371 |
| trypanosoma cruzi: association between seroreactivity of children and infection rates in domestic panstrongylus megistus (hemiptera: reduviidae). | | 1985 | 3920395 |
| entomological surveillance of chagas disease in berilo municipality, jequitinhonha valley, state of minas gerais, brazil. | this study aimed to evaluate the chagas disease control program which has operated since 1982 in the municipality of berilo in the jequitinhonha valley, minas gerais, brazil, based on evaluation of 5,242 domiciliary units (dus) and 7,807 outbuildings over an eight-year period of epidemiological surveillance implanted in 1997. a total of 391 triatomines (280 panstrongylus megistus and 111 triatoma pseudomaculata) were captured, indicating the continued predominance of the former species. however, ... | 2009 | 20209342 |
| occurrence of positivity for trypanosoma cruzi in triatomine from municipalities in southeastern brazil, from 2002 to 2004. | from an epidemiological point of view, more than 120 species of triatomine (hemiptera, reduviidae) are known. the occurrence and positivity for trypanosoma cruzi in triatomines in 16 municipalities of the triângulo mineiro and alto paranaíba were evaluated from january 2002 to december 2004. | 2010 | 20305960 |
| [analysis on the food source of panstrongylus megistus (hemiptera, reduviidae, triatominae) and its present importance as a vector for trypanosoma cruzi, in the state of minas gerais]. | investigation of the food source of triatomines helps in understanding the biology of these insects, and also helps to infer their importance in transmitting trypanosoma cruzi to humans. | 2010 | 20464139 |
| morphometry and morphology of the antennae of panstrongylus megistus burmeister, rhodnius neglectus lent, rhodnius prolixus stal and triatoma vitticeps stal (hemiptera: reduviidae). | the length of the four right antennal segments from nymphs and adults of panstrongylus megistus burmeister, rhodnius neglectus lent, rhodnius prolixus stal and triatoma vitticeps stal were measured. the length of the antennal segments of the adults of all four species, 4th and 5th instars of p. megistus, and 5th instar of r. neglectus and r. prolixus followed the same pattern: 2nd>3rd>4th>1st. the pattern of 1st and 2nd instars of p. megistus was: 4th>3rd>2nd>1st. for 3rd instars of p. megistus, ... | 2010 | 20498958 |
| 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 |
| [summary of results from the national surveys]. | this article aims to correlate the main results of three large national surveys on chagas disease (entomologic, seroprevalence and electrocardiographic) carried out in brazil from late 1970's to early 1980's, which served as baseline for definition of the control measures adopted in the country. the proportion of infected people was much higher in areas where triatoma infestans, the most efficient vector of chagas disease among the five principal species involved in transmission at that time, wa ... | 2011 | 21584357 |
| 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 |
| prevalence and intensity of infection, metacyclogenesis and nuclear phenotypes in panstrongylus megistus (burmeister, 1835) after ingestion of trypanosoma cruzi (chagas, 1909) ii and subjection to heat shock. | this study aimed to contribute to our knowledge of the parasite-vector interaction associated with trypanosoma cruzi (chagas, 1909) infection in panstrongylus megistus (burmeister, 1835), an important vector of chagas' disease in brazil. the prevalence and intensity of t. cruzi infection, the incidence of metacyclogenesis and the frequency of nuclear phenotypes in malpighian tubules were investigated in nymphs of p. megistus, reared at 28 °c and subjected to heat shock (40 °c, 1 hour) two days a ... | 2011 | 21755168 |
| contribution of at-, gc-, and methylated cytidine-rich dna to chromatin composition in malpighian tubule cell nuclei of panstrongylus megistus (hemiptera, reduviidae). | the malpighian tubule cell nuclei of male panstrongylus megistus, a vector of chagas disease, contain one chromocenter, which is composed solely of the y chromosome. considering that different chromosomes contribute to the composition of chromocenters in different triatomini species, the aim of this study was to determine the contribution of at-, gc-, and methylated cytidine-rich dna in the chromocenter as well as in euchromatin of malpighian tubule cell nuclei of p. megistus in comparison with ... | 2011 | 22197484 |
| 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 |
| isolation and molecular characterization of a major hemolymph serpin from the triatomine, panstrongylus megistus. | chagas disease kills 2.5 thousand people per year of 15 million persons infected in latin america. the disease is caused by the protozoan, trypanosome cruzi, and vectored by triatomine insects, including panstrongylus megistus, an important vector in brazil. medicines treating chagas disease have unpleasant side effects and may be ineffective, therefore, alternative control techniques are required. knowledge of the t. cruzi interactions with the triatomine host needs extending and new targets/st ... | 2014 | 24423259 |
| triatomine bugs, their microbiota and trypanosoma cruzi: asymmetric responses of bacteria to an infected blood meal. | triatomine bugs (hemiptera: reduviidae) are vectors of the flagellate trypanosoma cruzi, the causative agent of chagas disease. the study of triatomine gut microbiota has gained relevance in the last years due to its possible role in vector competence and prospective use in control strategies. the objective of this study is to examine changes in the gut microbiota composition of triatomines in response to a t. cruzi-infected blood meal and identifying key factors determining those changes. | 2016 | 27938415 |
| trypanosoma cruzi isolated from a triatomine found in one of the biggest metropolitan areas of latin america. | to characterize trypanosoma cruzi (tci) isolated from a panstrongylus megistus specimen found in one of the biggest metropolitan areas of latin america, the relationship between the tci group of t. cruzi and the transmission cycle in the urban environment was studied. | 2016 | 27192587 |
| vector-borne transmission of trypanosoma cruzi among captive neotropical primates in a brazilian zoo. | neotropical primates are important sylvatic hosts of trypanosoma cruzi, the etiological agent of chagas disease. infection is often subclinical, but severe disease has been described in both free-ranging and captive primates. panstrongylus megistus, a major t. cruzi vector, was found infesting a small-primate unit at brasília zoo (zoob), brazil. zoob lies close to a gallery-forest patch where t. cruzi circulates naturally. here, we combine parasitological and molecular methods to investigate a f ... | 2016 | 26813657 |
| the main sceneries of chagas disease transmission. the vectors, blood and oral transmissions--a comprehensive review. | this review deals with transmission of trypanosoma cruzi by the most important domestic vectors, blood transfusion and oral intake. among the vectors, triatoma infestans, panstrongylus megistus, rhodnius prolixus, triatoma dimidiata, triatoma brasiliensis, triatoma pseudomaculata, triatoma sordida, triatoma maculata, panstrongylus geniculatus, rhodnius ecuadoriensis and rhodnius pallescens can be highlighted. transmission of chagas infection, which has been brought under control in some countrie ... | 2015 | 25466622 |
| 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 |
| assessing the vulnerability of brazilian municipalities to the vectorial transmission of trypanosoma cruzi using multi-criteria decision analysis. | despite the dramatic reduction in trypanosoma cruzi vectorial transmission in brazil, acute cases of chagas disease (cd) continue to be recorded. the identification of areas with greater vulnerability to the occurrence of vector-borne cd is essential to prevention, control, and surveillance activities. in the current study, data on the occurrence of domiciliated triatomines in brazil (non-amazonian regions) between 2007 and 2011 were analyzed. municipalities' vulnerability was assessed based on ... | 2014 | 24857942 |
| 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 |
| biological and molecular characterization of a trypanosoma cruzi isolate obtained from panstrongylus megistus captured in sao paulo state, brazil. | an isolate of trypanosoma cruzi obtained from p. megistus captured in the peridomicile area of a home in santo antonio do jardim city in the state of sao paulo, denominated t. cruzi mogi, was characterized biologically and molecularly. the rflp analysis of the d7 divergent domain in the 24sα rdna and of the mini-exon positioned the t. cruzi isolate within the tci group. phylogenetic analysis performed with the trypanosomatid barcode confirmed that the isolate belongs to the tci group, with high ... | 2014 | 26204022 |
| profile of the trypanosoma cruzi vector infestation in jaboticatubas, state of minas gerais, brazil. | this work aimed to analyze the triatomine infestation scenario in jaboticatubas after 30 years of the uninterrupted actions of the program of chagas disease control. | 2014 | 24474024 |
| evaluation of natural foci of panstrongylus megistus in a forest fragment in porto alegre, state of rio grande do sul, brazil. | panstrongylus megistus is commonly found in wild environments of the state of rio grande do sul, brazil. the aim of this study was to characterize the network of refuges used by triatomine in a forest fragment of porto alegre and to identify trypanosoma cruzi infection, associated hosts and the epidemiological importance of both hosts and triatomines. | 2013 | 24270248 |
| metabolic signatures of triatomine vectors of trypanosoma cruzi unveiled by metabolomics. | chagas disease is a trypanosomiasis whose causative agent is the protozoan parasite trypanosoma cruzi, which is transmitted to humans by hematophagous insects known as triatomines and affects a large proportion of south america. the digestive tract of the insect vectors in which t. cruzi develops constitutes a dynamic environment that affects the development of the parasite. thus, we set out to investigate the chemical composition of the triatomine intestinal tract through a metabolomics approac ... | 2013 | 24204787 |
| american trypanosomiasis. | american trypanosomiasis is a parasitic disease caused by the flagellate protozoan trypanosoma cruzi. chagas disease is endemic in latin america, where an estimated 10-14 million people are infected, and an emerging disease in europe and the usa. trypanosoma cruzi is transmitted by blood-sucking bugs of the family reduviidae. rhodnius prolixus, panstrongylus megistus, triatoma infestans, and t. dimidiata are the main vectors in the sylvatic cycle. non vector-borne transmission includes blood tra ... | 2013 | 23829903 |
| novel adipokinetic hormones in the kissing bugs rhodnius prolixus, triatoma infestans, dipetalogaster maxima and panstrongylus megistus. | peptides of the adipokinetic hormone (akh)/red pigment-concentrating hormone (rpch) family were isolated and sequenced from the retrocerebral corpora cardiaca of four kissing bugs which are all vectors of the protozoan trypanosoma cruzi responsible for chagas' disease. the sequence of three novel akhs were deduced from the multiple ms(n) electrospray mass data: the octapeptide pglu-leu-thr-phe-ser-thr-asp-trp amide (denoted rhopr-akh) in rhodnius prolixus and panstrongylus megistus, the nonapept ... | 2013 | 23137850 |
| occurrence of synanthropic triatomines (hemiptera: reduviidae) in the federal district of brazil. | entomological surveillance of chagas disease in the federal district of brazil (df), has recorded the following triatomine species: panstrongylus megistus, p. geniculatus, p. diasi, rhodnius neglectus, triatoma pseudomaculata, and t. sordida. we aimed to analyze the spatial and temporal occurrence of triatomine species collected in df, and their indices of natural infection with trypanosomes. | 2012 | 22370832 |
| synanthropic triatomines (hemiptera, reduviidae) in the state of pernambuco, brazil: geographical distribution and natural trypanosoma infection rates between 2006 and 2007. | the present study shows a descriptive analysis of triatomine occurrence and its natural trypanosoma infection rates in the state of pernambuco, brazil, between 2006 and 2007. | 2012 | 22370830 |
| differential characterization of holocentric chromosomes in triatomines (heteroptera, triatominae) using different staining techniques and fluorescent in situ hybridization. | a comparative study of holocentric chromosomes in the triatomine species panstrongylus megistus, rhodnius pallescens and triatoma infestans was carried out in order to characterize heterochromatin, rdna active sites and nucleolar proteins. cytological preparations of seminiferous tubules were stained by silver impregnation, c banding, fluorochromes cma3/da and dapi/da, and fluorescent in situ hybridization (fish) with drosophila melanogaster 28s rdna probe. our results showed interesting aspects ... | 2007 | 18050092 |
| distribution of constitutive heterochromatin in species of triatomines with fragmentation of sex chromosomes x. | cytogenetic analyses of triatomines are considered to be important taxonomic tools. thus, we analyzed the pattern of constitutive heterochromatin in 7 species of triatomine with fragmentation of the sex chromosome x, focusing on the cytotaxonomy of these triatomines. the species analyzed included triatoma vitticeps, triatoma melanocephala, triatoma tibiamaculata, triatoma protracta, meccus pallidipennis, panstrongylus megistus, and panstrongylus lignarius. the seminiferous tubules of the adult m ... | 2014 | 25501239 |
| analysis of mitochondrial cytochrome b oxidase gene suggests passive dispersal of the panstrongylus megistus population in brazil. | | 2014 | 25424274 |
| [chagas disease control program in the state of são paulo, brazil: seroepidemiological aspects of homogeneous geographic microregions]. | between the years 1976 and 1980, the american trypanosomiasis was searched for among residents in two geographic microregions of the state of são paulo: campos de itapetininga, in the region of sorocaba, and encosta ocidental da mantiqueira paulista, in the region of campinas. both areas have in the past been colonized by triatoma infestans. campos de itapetininga remained, until the beginning of the 1970s as a stronghold of this species in the state of são paulo. panstrongylus megistus has curr ... | 2011 | 21584362 |
| [control program of chagas disease in são paulo, brazil: the control and surveillance of vector transmission]. | the control of the vectors of chagas' disease in the state of sao paulo are discussed, mainly those activities that led to the elimination of triatoma infestans. secondary factors that helped the control such as rural exodus are also analyzed. the article shows that since 1965 the control became a campaign with different phases due to the epidemiological situation, the acquired knowledge and the entomological surveillance. after 25 years of work, the elimination of all the focus of triatoma infe ... | 2011 | 21584361 |
| ultrastructural analysis of the nucleolar aspects at spermiogenesis in triatomines (heteroptera, triatominae). | in this study the ultrastructural technique was used to analyze seminiferous tubule cells of the triatomine species panstrongylus megistus, rhodnius pallescens and triatoma infestans. the data obtained provided evidence of the phenomenon known as persistence of the nucleolar material in initial spermatids at early differentiation. our results confirmed the presence of the nucleolus and its products during spermiogenesis up to the formation of the axoneme and during spermatid elongation in all th ... | 2010 | 20619665 |
| characterization of the external female genitalia of six species of triatominae (hemiptera: reduviidade) by scanning electron microscopy. | by macroscopic and microscopic dorsal side observation, it was noted that the ix and x segments of two species each of panstrongylus and triatoma terminate in an elongated way, whereas they terminate abruptly in the two species of rhodnius. scanning observation of the dorsal, ventral, lateral and posterior sides of the female genitalia of panstrongylus herreri, panstrongylus megistus, rhodnius colombiensis, rhodnius prolixus, triatoma infestans and triatoma vitticeps revealed that these six spec ... | 2010 | 20512241 |
| study of the nucleolar cycle and ribosomal rna distribution during meiosis in triatomines (triatominae, heteroptera). | aspects of nucleolar activity during spermatogenesis were assessed in three triatomine species (panstrongylus megistus, rhodnius pallescens and triatoma infestans) using cytochemical and fluorescent staining techniques. toluidine blue and a variant of critical electrolytic concentration (cec) allowed the discrimination of rrna providing structural details of the nucleolus and rna distribution during meiotic cell division. acridine orange fluorochrome staining permitted the differentiation of nuc ... | 2008 | 17976997 |
| ribosomal dna its-1 intergenic spacer polymorphism in triatomines (triatominae, heteroptera). | the length polymorphism of ribosomal dna its-1 intergenic spacer was analyzed in eight species of triatomines belonging to triatoma, rhodnius, and panstrongylus genera. the analyzed species were rhodnius domesticus, r. neivai, r. robustus, triatoma brasiliensis, t. infestans, t. vitticeps, panstrongylus megistus, and p. herreri. these insects are vectors of chagas' disease, one of the most prominent public health problems among south american countries. this work allowed the differentiation betw ... | 2005 | 16187161 |
| [triatomine: ovicidal action of some pyretroids]. | the insecticidal action on eggs of triatomine have been little considered in the control activitys of chagas' disease. with objective [corrected] of to compare the potential of three synthetic pyrethroids (deltamethrin,alphacypermethrin and lambdacyhalothrin) on eggs, the authors realized laboratory tests. the pyretroid lambdacialotrin is more efficient. the following species were used in this experiment: panstrongylus megistus and triatoma sordida. the specie triatoma sordida is more susceptibl ... | 2012 | 12045817 |
| changes in nuclear phenotypes following cold shock in panstrongylus megistus (burmeister). | the nuclear phenotypes of malpighian tubule epithelial cells of 5th instar male nymphs of the blood-sucking insect panstrongylus megistus were studied immediately after a short (1 h) cold shock at 0 degrees c, and 10 and 30 days later. the objective was to compare the responses to a cold shock with those known to occur after hyperthermia in order to provide insight into the cellular effect of cold in this species. nuclei which usually exhibited a conspicuous y chromosome chromocenter were the mo ... | 2008 | 11080782 |
| nuclear phenotype changes after heat shock in panstrongylus megistus (burmeister). | the nuclear phenotypes of malpighian tubule epithelial cells of male nymphs of the blood-sucking insect, panstrongylus megistus, subjected to short- and long-duration heat shocks at 40oc were analyzed immediately after the shock and 10 and 30 days later. normal nuclei with a usual heterochromatic body as well as phenotypes indicative of survival (unravelled heterochromatin, giants) and death (apoptosis, necrosis) responses were observed in control and treated specimens. however, all nuclear phen ... | 2008 | 10733752 |
| survival and molting incidence after heat and cold shocks in panstrongylus megistus burmeister. | survival and molting incidence were studied after heat (40 degrees c) and cold (0 degree c) shocks in specimens of panstrongylus megistus with the aim of establishing its response to temperature stress under laboratory rearing conditions and to understand occasional changes in the biological characteristics of specimens captured in nature. the response to the thermal shocks was found to vary as a function of the temperature and duration of the shock, developmental phase and sex of the specimens, ... | 2008 | 10029925 |
| number of chromosomes, feulgen-dna content, and nuclear phenotypes in domestic and wild specimens of panstrongylus megistus. | specimens of panstrongylus megistus with different levels of adaptation to a domestic way of life had some of their nuclear and chromosomal characteristics compared, in an attempt to differentiate them by cytological means. the number of chromosomes in male testes was found not to differ. the nuclear frequency and phenotypes of the malpighian tubules were also found to be the same. on the other hand, feulgen-dna values of metaphase chromosomes in insects from a population with a sylvatic distrib ... | 1986 | 3314754 |
| [panstrongylus megistus leucofasciatus n. sp. from northeastern brazil]. | | 1959 | 14418687 |
| use of noninvasive 'bug-eggs' to enable comparative inferences on genetic mating system with and without parental information: a study in a cattle egret colony. | colonial waterbirds such as herons, egrets and spoonbills exhibit ecological characteristics that could have promoted the evolution of conspecific brood parasitism and extra-pair copulation. however, an adequate characterization of the genetic mating systems of this avian group has been hindered by the lack of samples of elusive candidate parents which precluded conducting conventional parentage allocation tests. here, we investigate the genetic mating system of the invasive cattle egret using h ... | 2017 | 28854191 |
| 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 |
| [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 |
| 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 |
| [entomological surveillance for chagas disease in the mid-western region of minas gerais state, brazil, from 2000 to 2003]. | in minas gerais state, brazil, after the elimination of triatoma infestans by the brazilian chagas disease control program, some triatomine species, such as panstrongylus megistus, have merited the attention of entomological surveillance authorities. after the decentralization of the brazilian health system, certain administrative and operational difficulties have been observed in some municipalities (counties). this study aims to evaluate entomological surveillance for chagas disease in the 54 ... | 2005 | 15868046 |
| 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 |
| 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 |
| patterns of antennal sensilla of panstrongylus megistus from three brazilian states. | the objective of the present study was to analyze and describe the phenotype of the antennal sensilla of panstrongylus megistus, one of the epidemiologically most important species of triatomines in brazil. specimens from the brazilian states of goiás (go), minas gerais (mg), and rio grande do sul (rs) were compared, based on studies of four types of sensilla on three antennal segments: thick-walled trichoid (tk), thin-walled trichoid (th), bristles (br), and basiconica (ba). discriminant analys ... | 2006 | 16410953 |
| [geographical distribution and indicators entomologic of sinantropic triatomines captured in the state of goiás]. | the geographic distribution of triatomines in goiás and entomological indicators in the home environment are presented: home infestation, home triatomine density and vector infection by trypanosoma cruzi. the indicators studied were from triatomines captured inside and outside homes in 201 municipalities in the state of goiás, brazil, between 2000 and 2003. a total of 249,868 home units were investigated and 51,570 triatomines were captured, and 335 specimens were found to be infected with trypa ... | 2007 | 17568889 |
| first report of panstrongylus megistus sylvatic focus in municipality of bambuí, state of minas gerais, brazil. | in 1943, the center for the study and prophylaxis of chagas disease, oswaldo cruz foundation, state of minas gerais (mg), was created in the municipality of bambuí to carry out studies related to chagas disease in the mid-western region of mg. since that time, several investigations have been conducted to determine the natural habitat of triatomines, but panstrongylus megistus colonies have never been found in this region. this paper records the first finding of a p. megistus sylvatic colony in ... | 2011 | 21739044 |
| biochemical and cellular characterization of lipophorin-midgut interaction in the hematophagous panstrongylus megistus (hemiptera: reduviidae). | in order to better understand the metabolism of dietary lipids in hematophagous insects, we have performed a biochemical and cellular characterization of lipophorin (lp)-midgut interaction in panstrongylus megistus, a vector of chagas' disease. the study was accomplished by solid-phase binding assays or with iodinated lp ((125)i-lp), using midgut membranes from fifth instar nymphs after ecdysis and after insects received a blood meal. results obtained from both physiological conditions indicated ... | 2009 | 19507302 |
| alpha-glycerophosphate dehydrogenase activity in flight muscles of triatomine bugs panstrongylus megistus and triatoma sordida. | the alpha-glycerophosphate dehydrogenase (alpha-gpdh) activity in flight muscles of panstrongylus megistus and triatoma sordida, vectors of chagas disease in brazil, was studied. both species showed higher enzymatic activities in fliers than in non-fliers insects. t. sordida exhibited a higher proportion of flier insects than p. megistus. a possible role of alpha-gpdh on triatomines flight is discussed. | 2006 | 10998220 |
| feeding behavior of different species of chagas' disease vectors stimulated with blood sources at different temperatures. | 1. the feeding behavior of six triatomid species toward latex condoms filled with blood at 26 +/- 1 and 36 +/- 1 degrees c was observed for 4 h. 2. the species studied were triatoma infestans, triatoma brasiliensis, triatoma vitticeps, triatoma pseudomaculata, rhodnius prolixus and panstrongylus megistus, and 34 to 348 insects were studied in each group (average, 190). all the life stages of each species were used. 3. although most insects (80%, average for 6 species) preferred the warmer blood, ... | 1992 | 1304939 |
| factors controlling the volume of feces produced by triatomine vectors of chagas' disease. | triatomine species influenced volume of feces produced; triatoma dimidiata produced the largest volume of feces followed by panstrongylus megistus, rhodnius prolixus, and triatoma infestans. moreover, stage and sex affected fecal production; 5th-stage female nymphs excreted the largest volume of feces. the amount of blood ingested was significantly correlated with the volume of feces produced in 10 out of 11 experimental groups. triatome size and volume of feces produced were less closely correl ... | 1983 | 6142633 |
| kazal-type inhibitors in the stomach of panstrongylus megistus (triatominae, reduviidae). | triatomines inhibit the clotting of ingested blood in the stomach (anterior midgut). after verifying this phenomenon in panstrongylus megistus using coagulation assays, a full-length cdna encoding a kazal-like inhibitor was amplified by pcr. the open reading frame encodes a putative precursor protein of 412 amino acid residues, which was named pmstkaz and contains seven kazal-like domains forming four kazal-type inhibitors. a single domain inhibitor and three double-domain inhibitors possess seq ... | 2010 | 20206694 |
| the storage of nutritional resources during vitellogenesis of panstrongylus megistus (hemiptera: reduviidae): the pathways of lipophorin in lipid delivery to developing oocytes. | in this work, we have analyzed the pathways by which lipophorin (lp) delivers its lipid cargo to developing oocytes of panstrongylus megistus, a hematophagous vector of chagas' disease. lp, vitellin, total lipids and proteins were measured in ovarian tissues at different stages of the reproductive cycle. localization of lp in developing oocytes, mainly at their cortical area, was demonstrated by immunofluorescence assays using an anti-lp antibody labeled with fitc. in vivo approaches injecting f ... | 2011 | 21277855 |
| redundancy of proteins in the salivary glands of panstrongylus megistus secures prolonged procurement for blood meals. | panstrongylus megistus, a vector for the chagas disease parasite trypanosoma cruzi, is a hematophagous bug widely distributed in south america. this ubiquitous triatomine is known to colonize different wild life habitats. additionally, p. megistus synanthropy, preying upon mammals, birds, reptiles, and eventually being predators upon insect's hemolymph probably increases its ability to survive after prolonged fasting. it was suspected that the p. megistus mechanisms of adaptation to survival mig ... | 2011 | 21601023 |
| aspects of classification of hemiptera hemocytes from six triatomine species. | the objective of this work was to characterize, and compare different morphological types of hemocytes of rhodnius prolixus, rhodnius robustus, rhodnius neglectus, triatoma infestans, panstrongylus megistus, and dipetalogaster maximus. this information provides the basis for studying the cellular immune systems of these insects. seven morphological hemocyte types were identified by phase-contrast microscopy: prohemocytes, plasmatocytes, granular cells, cystocytes, oenocytoids, adipohemocytes and ... | 2006 | 1842390 |
| triatomines in dwellings and outbuildings in an endemic area of chagas disease in northeastern brazil. | the present study identified the triatomines collected in intra and peri-domestic environments, observed the occurrence of trypanosoma cruzi infection in triatomines and correlated this information with housing conditions and the fauna associated with the rural areas of the city of itabaianinha, located in the state of sergipe, brazil. | 2012 | 23295872 |
| synanthropic triatomines as potential vectors of trypanosoma cruzi in central brazil. | chagas disease surveillance requires current knowledge on synanthropic triatomines. we analyzed the occurrence and trypanosoma cruzi infection rates of triatomine bugs in central brazil, during 2012-2014. | 2018 | 29340461 |
| evaluation of the chagas disease control program in açucena municipality, rio doce valley, state of minas gerais, brazil. | açucena municipality, rio doce valley, state of minas gerais, brazil temporarily (2001-2005) interrupted epidemiological surveillance for chagas disease. the objective of this work was to evaluate the chagas disease control program (cdcp) in açucena and to offer suggestions for improving local epidemiological surveillance. | 2014 | 24861292 |
| combined phylogenetic and morphometric information to delimit and unify the triatoma brasiliensis species complex and the brasiliensis subcomplex. | "triatoma brasiliensis species complex" was defined as a monophyletic group of the species: t. brasiliensis, t. juazeirensis, t. melanica, and t. sherlocki. an alternative grouping scheme proposed the concept of "brasiliensis subcomplex" which included the former species together with t. melanocephala, t. petrocchiae, t. lenti, t. tibiamaculata, and t. vitticeps. to evaluate the relationship among these taxa we combined the results obtained with four mitochondrial genes (12s, 16s, coi and cytb, ... | 2017 | 28219669 |
| 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 |
| a multi-species bait for chagas disease vectors. | triatomine bugs are the insect vectors of trypanosoma cruzi, the etiological agent of chagas disease. these insects are known to aggregate inside shelters during daylight hours and it has been demonstrated that within shelters, the aggregation is induced by volatiles emitted from bug feces. these signals promote inter-species aggregation among most species studied, but the chemical composition is unknown. | 2014 | 24587457 |
| aggregation behaviour in panstrongylus megistus and triatoma infestans: inter and intraspecific responses. | we tested the aggregation response to inter and intraspecific chemical signals in panstrongylus megistus and triatoma infestans. as previously described for t. infestans, larvae of p. megistus significantly aggregated on papers impregnated with their own excrement and on papers marked with cuticular substances deposited on surfaces on which these insects had walked. t. infestans bugs also aggregated on papers impregnated by faeces or by cuticular substances of p. megistus, and p. megistus aggreg ... | 2002 | 11755431 |
| experimental evidence for a demographic cline in panstrongylus megistus populations. | the population biology of three populations of panstrongylus megistus was compared to determine possible influence on the behaviour and epidemiological importance of this species. the results demonstrated differences in terms of egg eclosion time, nymphal mortality and development rates, and feeding and defaecation rates. these differences appeared to follow a geographical cline, primarily reflecting different degrees of adaptation to domestic habitats. | 2001 | 11562700 |
| 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 |
| 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 |
| [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 |
| monoclonal antibodies against brain neurosecretory a cells of panstrongylus megistus inhibit moulting and egg production in triatomines. | | 2006 | 2215222 |
| vitellin and vitellogenin characterization of triatoma infestans and related species. | the vitellogenin-vitellin (vg-vn) of triatoma infestans is a glycolipoprotein with a mol. wt. of 220,000; is a high density lipoprotein (1.18-1.21 g/ml) with low electrophoretic mobility at ph 8.2. there are many common proteins present in females, males, nymphs and eggs, but none is a glycolipoprotein. the major band of protein revealed a mol. wt. of 43,000, it is an anodic protein which appears in all the fractions of saline gradient. males and females have a glycolipoprotein with electrophore ... | 1986 | 3111174 |
| [enzyme electrophoresis for the study of triatomidae with special reference to panstrongylus megistus subpopulations]. | | 1982 | 6763730 |
| the flushing-out activity of pyrethrum and synthetic pyrethroids on panstrongylus megistus, a vector of chagas's disease. | | 1980 | 7010701 |
| activity of precocenes on the chagas's disease vector, panstrongylus megistus. | | 1980 | 6777913 |
| the hormonal control of mitosis and meiosis during oögenesis in a blood-sucking bug panstrongylus megistus. | | 1979 | 397283 |
| vesicular inclusions in the nuclei of epithelial cells of malpighian tubes of the hemipteran, panstrongylus megistus. | vesicular inclusions observed in malpighian tubes of hemipterans have been associated with a virus-like infection rather than a lysosomal-type activity, which is the case of the identical cytoplasmic structures. | 1978 | 658307 |
| [on the 1st food of the nymph of the 1st stage of panstrongylus megistus burmeister (1835)]. | | 2017 | 4964930 |
| [on the influence of light on the hatching of the eggs of panstrongylus megistus burmeister, 1835]. | | 2017 | 5887882 |
| [panstrongylus megistus leucofasciatus lucena, 1959. review of publications and additional notes]. | | 1959 | 14467141 |
| [monthly variations of the incidence of developmental forms of triatoma infestans and panstrongylus megistus in bambui, minas gerais]. | | 2017 | 13369131 |
| [note on the finding of examples of panstrongylus megistus infected by schizotrypanum cruzi and capture of an example of triatoma infestans, in belo horizonte, minas gerais]. | | 1953 | 13134727 |
| [discovery of a specimen of panstrongylus megistus infected with trypanosoma in the town of redenção, ceará]. | | 1951 | 14942062 |
| [parasitism of ova of triatoma infestans and panstrongylus megistus by the microhymenopter telenomus fariai lima, 1927]. | | 1950 | 24539417 |
| [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 |
| [relationships between trypanosoma cruzi transmission cycles in the county of bambuí, minas gerais, brazil]. | this study examines recent relationships between domestic and sylvatic transmission cycles of t. cruzi in the county of bambuí, mg, brazil. in the late l930s, panstrongylus megistus was found in 75% of houses. subsequently, triatoma infestans became the predominant species, found in 20% of urban households and in more than 60% of periurban homes. with intense insecticide control campaigns between l956 and l969, t. infestans was eradicated from the county, transmission of chagas' disease to man w ... | 2003 | 14676933 |
| trypanosoma cruzi transmission in a captive primate unit, rio de janeiro, brazil. | a breeding in captivity program of neotropical primates for subsequent reintroduction in nature is in progress at the primatology center of rio de janeiro (cprj). almost 200 animals of 20 species that include both wild captured animals and specimens born in captivity are maintained in cprj. here, we examined 198 primates of cprj for infection with the protozoan parasite trypanosoma cruzi. the animals included 18 species of eight genera. we also performed an "ad lib" search for triatomines that c ... | 2004 | 14739028 |
| variability of the salivary proteins of 20 brazilian populations of panstrongylus megistus (hemiptera: reduviidae: triatominae). | the objective of the present study was to study variability in the salivary proteins of 20 panstrongylus megistus populations from different ecotopes and verify whether this variability influenced the intensity of the response to specific anti-saliva antibodies. electrophoretic analysis of p. megistus saliva showed a complex protein composition and great interpopulation variability. a higher concentration of bands was observed in the 17-29 kda region. the phenogram constructed from the electroph ... | 2004 | 15301972 |