| observations on the feeding and defecation patterns of three triatomine species (hemiptera: reduviidae). | a comparative laboratory study of feeding and defecation behavior of three species of tritomines (rhodnius prolixus, triatoma infestans and t. dimidiata) indicated evident differences among the species and among the different stages of same species. time required for a full blood meal was related to the size of the specimen. insects required an average of 11-28 min for engorgement although some finished within 10 min. t. dimidata frequently interrupted the act of feeding, a probable explanation ... | 1977 | 16468 |
| soluble trehalase from panstrongylus megistus burm.(reduviidae, triatominae). | | 1979 | 37553 |
| [anatomic and histologic studies of a triatominae subfamily (heteroptera, reduviidae). triatoma infestans' brain and its nerves]. | to give a concrete aspect of structure, topography and function of the different nervous systems of the triatominae, we begin this study with a description of the senso-motor system. as the first part we choose the study of the brain and its nerves. the external form of the brain is conditioned by the anatomy and morphology of the head. the brain is situated in the posterior part of the head beneath and behind the ocelli. it is characterized by the reduction of its longitudinal extension and, by ... | 1976 | 45709 |
| domestic triatomines (reduviidae) and insect trypanosome infections in el salvador, c.a. | twenty-five salvadoran communities have been surveyed to learn more about the distribution of chagas' disease vectors and trypanosome parasites in that country. the results indicate that each of several factors--local variations in housing construction, insecticide applications, geographic elevation, and the vector species involved--can have a critical effect on transmission of the disease agent. | 1978 | 100163 |
| chagas's disease in the amazon basin: 1. trypanosoma cruzi infections in silvatic mammals, triatomine bugs and man in the state of pará, north brazil. | a total of 1,197 wild animals from pará state north brazil, were examined for haematozoa. trypanosoma cruzi-like parasites were found in 13 different species, and were particularly common in a variety of marsupials (didelphidae), porcupines (coendou spp.), armadillos (dasypus novemcinctus) and coatimundis(nasua nasua). three human infections are reported, making a total of seven autochthonous cases of chagas's disease from pará since the first were described in 1969. a serological survey of 5,31 ... | 1979 | 112730 |
| domiciliary biting frequency and blood ingestion of the chagas's disease vector rhodnius prolixus ståhl (hemiptera: reduviidae), in venezuela. | demolition of a rural house in the state of cojedes, venezuela, provided a collection of 7.934 rhodnius prolixus of which a random sample of 1,415 was weighed within 48 hours. the field weights, coupled with laboratory information of weight loss (in %) with time, average blood ingestion and meal size sufficient to promote moulting, were used to estimate biting rate under domiciliary conditions. the results show that in this particularly highly infested house, the r. prolixus population bites, on ... | 1979 | 112731 |
| 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 |
| establishment and characterization of a cell line (btc-32) from the triatomine bug, triatoma infestans (klug) (hemiptera: reduviidae). | the establishment of a cell line from embryonic tissues of the triatomine bug, triatoma infestans is described. the cell line consists of three cell types which are described, and has a population doubling time of 48 hours during the logarithmic phase of growth. a proportion of the cells remain in the medium as floaters. of the chromosome preparations that could be counted, the majority contained the diploid (2n = 22) number. the cell line has undergone 129 subcultures and has been maintained fo ... | 1977 | 322623 |
| assembly pheromone of triatoma infestans and rhodnius prolixus nymphs (hemiptera: reduviidae). | | 1977 | 328883 |
| geographical extension in a new ecological association of panstrongylus humeralis (hemiptera: reduviidae) natural host of trypanosoma cruzi in panama. | | 1977 | 328884 |
| pathogens of reduviidae (assassin bugs). | | 1977 | 332400 |
| the energy budget of triatoma phyllosoma (hemiptera: reduviidae) under laboratory conditions. | | 1977 | 344882 |
| a microhymenopteran parasite of eggs of psammolestes arthuri (hemiptera: reduviidae) and observations of experimental parasitism of eggs of rhodnius prolixus (hemiptera: reduviidae). | | 1978 | 344883 |
| [external phenotypic differences between interspecies hybrids and their respective species, vectors of chagas' disease in brazil (triatominae, reduviidae)]. | | 1978 | 345369 |
| computer analysis of stained chromatin on malpighian tubes of triatoma infestans klug (hemiptera, reduviidae). | | 1978 | 370689 |
| larval competition between telenomus costalimai (hymenoptera: scelionidae) and ooencyrtus trinidadensis venatorius (hymenoptera: encyrtidae) after simultaneous oviposition in rhodnius prolixus eggs (hemiptera: reduviidae). | | 1979 | 396374 |
| chromosomes of triatominae i: haploid karyotypes of three species in the genus rhodnius (hemiptera: reduviidae). | | 1979 | 396748 |
| chromosomes of triatominae ii: karyotypes studies of five species in the genus rhodnius (hemiptera: reduviidae). | | 1979 | 396749 |
| chromosomes of triatominae iii: karyotypes studies of triatona pallidipennis stal (hemiptera: reduviidae). | | 1979 | 396750 |
| [dual activity of the pars intercerebralis of panstrongylus megisturs (heteroptera, reduviidae) in the control of oogenesis and molting]. | the action of a and a' cells of the pars intercerebralis of p. megistus on female gonial mitosis and meiosis is established experimentally by selective ablations and by implantations of brains devoid of their a cells. molting is dependent on two factors originating in each neurosecretory cell type. | 1977 | 404085 |
| [spontaneous infection of marmoset-monkeys (sanguinus oedipus) with a trypanosoma cruzi-like-strain, springer 1975. isolation and identification (author's transl)]. | a trypanosoma cruzi-like strain was isolated from marmoset monkeys originating from columbia. the frequency of affected monkeys was up to 32.7%. the parasite density was 10-40 trypomastigote forms per mililiter. monkeys, rats, mice and other small rodentia were found to be susceptible. clinical symptoms or histopathological findings could not be acertained with these trypanosomes even after a 2 1/2 year observation period. the strain behaved as an apathogen in experimental animals. the parasitae ... | 1977 | 416623 |
| effects on humans of bites of australian non-bloodsucking reduviid bugs. | occasional reports are received of painful bites inflicted on humans in australia by predatory bugs of the family reduviidae. a compilation is made here of such reports, which were obtained from published sources and from the files of the school of public health and tropical medicine, and is accompanied by available data on the circumstances of the attack and the symptoms produced in the victim. particular attention is given to two recent cases of reactions to bites of species of piestolestes, a ... | 1977 | 613198 |
| [demonstration of an enzyme inhibiting coagulation of blood ingested by the blood-sucking insect, rhodnius prolixus (heteroptera, reduviidae)]. | a new fibrinolytic enzyme, "the prolixase", was isolated and purified from the haemolymph of rhodnius prolixus. the mode of action of the enzyme was studied and compared to that of extracts from salivary glands and midgut of the insect. it appears that the prolixase is involved in inhibiting the coagulation of the blood ingested by rhodnius during its blood meal. the mode of action of the enzyme in this phenomenon is discussed. | 1978 | 747454 |
| [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 |
| [wild reservoirs and vectors of cruzi. lx. attempts to cross rhodnius prolixus stal, 1859 and rhodnius neglectus lent, 1954 (hemiptera, reduviidae)]. | | 1976 | 819981 |
| [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 |
| tolerance of peromyscus to the feeding of triatoma (hemiptera: reduviidae). | | 1975 | 1099205 |
| [silvan vectors and reservoirs of trypanosoma cruzi. lix. geografic distribution of triatominae in the rio grande hydrographic basin, brazil (hemiptera, reduviidae)]. | | 1975 | 1101317 |
| lethal effect of a bait for rhodnius prolixus (hemiptera: reduviidae), the vector of chagas' disease, containing hexachlorocyclohexane (hch), under laboratory conditions. | the lethal effect of a bait containing an aqueous hexachlorocyclohexane (hch) suspension at the concentration of 1g/l and maintained at room temperature was studied in the laboratory over a period of 12 weeks. the suspension was placed in a latex bag hanging inside a 1000-ml beaker tightly covered with nylon netting, and left there with no changes for 85 days. sixteen groups of r. prolixus bugs, consisting on average of 30 specimens each, were successively exposed to the bait and observed at dif ... | 1992 | 1285256 |
| autonomic neuropathy and immunological abnormalities in chagas' disease. | chagas' disease (american trypanosomiasis) is caused by infection with the haemoflagellate parasite trypanosoma cruzi, which is transmitted from animals to man by the reduviidae bug. the human disease is characterized by two phases. in the first (acute phase) parasitaemia is high and general symptoms variable. the next, which is lifelong (chronic phase), is characterized by inflammatory lesions in cardiac and skeletal muscle, gastrointestinal, the autonomic nervous system. parasites are difficul ... | 1992 | 1290925 |
| influence of light conditions on adult mortality and egg-laying of triatoma brasiliensis neiva, 1911 (hemiptera: reduviidae: triatominae). | we compared, for triatoma brasiliensis, the egg-laying process and the mortality of adults under conditions of almost permanent darkness and with normal laboratory luminosity. mortality did not differ between groups. the egg-laying per vial and per female was significantly greater in the group of normal luminosity. we consider that it is not recommendable to keep the adults of this species under complete darkness. other biological aspects should be analysed in relation to luminosity. | 1992 | 1340536 |
| embryology of triatoma infestans (klug), (hemiptera, reduviidae), a chagas' disease vector. | this study reports the embryogenesis of t. infestans (hemiptera, reduviidae). morphological parameters of growth sequences from oviposition until hatching (12-14 d 28 degrees c) were established. five periods, as percent of time of development (td), were characterized from oviposition until hatching. the most important morphological features were: 1) formation of blastoderm within 7% of td; 2) germ band and gastrulation within 30% of td; 3) nerve cord, limb budding, thoracic and abdominal segmen ... | 1992 | 1342072 |
| cytogenetics as a tool for triatomine species distinction (hemiptera-reduviidae). | several cytogenetic traits were tested as species diagnostic characters on five triatomine species: rhodnius pictipes, r. nasutus, r. robustus, triatoma matogrossensis and t. pseudomaculata. four of them are described for the first time. the detailed analysis of the meiotic process and the application of c-banding allowed us to identify seven cytogenetic characters which result useful to characterize and differentiate triatomine species. | 1992 | 1343644 |
| [comparative study of the male external genitalia of triatoma neotomae neiva, 1911, and triatoma nitida usinger, 1939, (hemiptera: reduviidae)]. | | 1992 | 1343789 |
| [bionomic studies of dipetalogaster maximus (uhler, 1894) (hemiptera, reduviidae, triatominae). iii. population dynamics]. | a population dynamics study of d. maximus was carried out under laboratory conditions (28 degrees c e 65% +/- 5% u.r.), and the methodology was the same that has been used for rearing these insects. in order to evaluate the population growth rate of this species, during a 24 months period, five colonies started with a couple recently emerged were observed. each couple (a male and a female) was maintained in a glass container measuring 20 cm of diameter and 20 cm in height with filter paper on th ... | 1992 | 1343801 |
| population dynamics and control of triatoma infestans. | analysis of field populations of triatoma infestans (hemiptera: reduviidae), after a 3-year study, shows that population growth rate is affected by both density-dependent and density-independent mortality. although an equilibrium exists, apparently as a consequence of a density dependent-mechanism, population density fluctuates throughout the year because of the effect of monthly mean minimum temperature as a density-independent source of mortality. simulation studies based on moran curves shows ... | 1992 | 1421494 |
| autogeny in three species of triatominae: rhodnius prolixus, triatoma rubrovaria, and triatoma infestans (hemiptera: reduviidae). | autogeny, the capacity of a female to lay eggs without having ingested any blood meal in the adult stage, was studied in three species of triatominae: triatoma infestans, triatoma rubrovaria, and rhodnius prolixus. when nymphs of t. rubrovaria and r. prolixus were fed chicken blood, autogeny occurred frequently, even with only one meal. in t. infestans autogeny was frequent as well, but demanded at least two nymphal blood meals. total number of autogenic eggs was positively correlated with the b ... | 1992 | 1495041 |
| isozyme variability and differentiation between rhodnius prolixus, r.robustus and r.pictipes, vectors of chagas disease in venezuela. | enzyme polymorphism in triatomine bugs of the genus rhodnius (hemiptera: reduviidae), vectors of chagas disease, is analysed using both starch and polyacrylamide gel electrophoresis. out of forty-five enzymes assayed, the electromorphs of seventeen of them: ao, ca, dia, es, es-a, fh, gpd, g6pd, gpi, mdh, me, 6pgd, pgm, acon, acph, lap and sod, involving twenty-two putative structural loci, were scorable. these gene-enzyme systems were therefore selected for routine characterization of r.prolixus ... | 1992 | 1600225 |
| recovery of triatoma infestans populations after insecticide application: an experimental field study. | the capacity of populations of triatoma infestans (klug) (hemiptera: reduviidae) to survive and recover was assessed after application of insecticide (gamma-hch at a rate of 0.5 g a.i./m2) at different seasons. t. infestans populations were maintained in experimental chicken houses under natural climatic conditions in a region of argentina endemic for chagas disease transmitted by these bugs. based on previous studies of t. infestans populations in these habitats, each experimental group was set ... | 1991 | 1722730 |
| 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 |
| [survival and occurrence of molting in triatoma infestans klug (hemiptera, reduviidae) after temperature shock]. | survival and molting occurrence were studied in specimens of triatoma infestans over 30 days after temperature shocks. hyperthermal and hypothermal shocks could be found to affect both survival and molting incidence as a function of temperature and period of the development phase and sex of the specimens. considering the various test conditions, the shock at 0 degree c for 12 h was found to elicit the most deleterious effect, whereas shocks at 40 degrees c and 0 degree c even for 1 h are interpr ... | 1991 | 1843235 |
| search for a sex pheromone in triatoma mazzottii (hemiptera: reduviidae). | hexane extracts of volatile substances from sexually mature male and female triatoma mazzottii usinger, collected with cold glass trap (-10 degrees c) and evaluated in a wind tunnel, demonstrated the absence of a sex pheromone. the females failed to secrete a liquid from the sixth and seventh abdominal sternite. | 1991 | 1875377 |
| circadian rhythm of egg hatching in triatoma infestans (hemiptera: reduviidae). | the timing of hatching of triatoma infestans (klug) eggs was analyzed by means of time-lapse photography. under a photoperiod of 12:12 (l:d) and constant darkness, maximum eclosion occurred at the end of the subjective night. under constant light, the rhythmicity disappeared. hatching rhythm seems to be maintained by a circadian endogenous oscillator. by hatching close to dawn, when relative humidity is high, insects may avoid excessive water loss. | 1991 | 1941946 |
| tyrosine hydroxylase-like immunoreactivity in the brain of fifth instar rhodnius prolixus stål (hemiptera: reduviidae). | the distribution of tyrosine hydroxylase-like immunoreactivity was mapped in whole-mount preparations of the brain of fifth instar rhodnius prolixus stål. immunoreactivity was limited to neuronal cell bodies and processes, which were distributed over both ventral and dorsal surfaces of the cns. the brain, excluding the optic lobes, contained about 160 tyrosine hydroxylase-like immunoreactive cells. each optic lobe contained two groups of small round cell bodies, which were too numerous to count. ... | 1990 | 1981216 |
| probability of transmission of chagas disease by triatoma infestans (hemiptera: reduviidae) in an endemic area of santiago del estero, argentina. | the daily probability (p) of transmission of trypanosoma cruzi to a noninfected human host by an infected triatoma infestans bug was estimated using field data from a 2-year longitudinal study carried out in a rural settlement of 20 households in amamá, santiago del estero, argentina. the following information was used for this purpose: the bug density and the proportion of infected bugs; the bug biting rate and the distribution of bites between humans and animals; the age-specific seropositivit ... | 1990 | 2127382 |
| [bionomic studies of cavernicola lenti barrett & arias, 1985 (hemiptera, reduviidae, triatominae)]. | in the biological study, the development of the biological cycle of the insect under different feeding conditions was evaluated. the insects were fed on either mouse blood (c) or pigeon blood (p) using two types of rearing techniques (individual or group) at 28 degrees c and 90% relative humidity (which is equivalent to their natural environment). a fifth cycle studied, was fed on mouse blood reared on group, and maintained at laboratory environmental temperature. in the five cycles analyzed, it ... | 1990 | 2134711 |
| [biology of triatoma vitticeps (stal, 1859) under laboratory conditions (hemiptera: reduviidae: triatominae). ii. resistance to fasting]. | following the study on the biology of triatoma vitticeps (gonçalves et al., 1988) observations have been made on its resistance to starvation. of the 286 eggs obtained only 201 hatched and reached the intended stage for observation. the others did not eclode, neither reached the ecdisis nor died, without explanation. the nymphs were kept, separately, in borrel flasks and properly listed. the blood-meal was performed in mice, although the insects were kept without feeding as soon as moulted. the ... | 1989 | 2181243 |
| [prolixase, a fibrinolytic enzyme isolated from rhodnius prolixus (heteroptera, reduviidae): antigenic properties]. | antigenic properties of prolixase are studied showing that this fibrinolytic enzyme, induces in the rabbit, the formation of precipitating but slightly, hemagglutinating homologous antibodies. | 1985 | 2418798 |
| 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 |
| cultivation of blastocrithidia triatomae (trypanosomatidae) on a cell line of its host triatoma infestans (reduviidae). | blastocrithidia triatomae parasitizes vectors of chagas' disease and is very difficult to cultivate in conventional media. however, co-cultivation with a cell line of its host triatoma infestans (ti-32; in schneider's drosophila medium supplemented with 20% foetal calf serum and 10% tryptose phosphate broth) led to vigorous growth at 24 or 28 degrees c without an adaptation phase. more than 60 primary cultures were initiated successfully without any failures. subcultures could be started immedia ... | 1989 | 2505214 |
| sylvatic focus of chagas' disease in oaxaca, mexico. | during three field trips to the community of 'la humedad', municipality of santiago jamiltepec, oaxaca (a state in the southern part of the mexican republic), live specimens of triatoma mazzottii usinger (hemiptera: reduviidae) were found infected with trypanosoma cruzi. the insects were captured in only one of the dwellings inspected in the locality, and in four small caves where bats and other mammals live. these findings suggest the need for further studies on the existence of a sylvatic cycl ... | 1989 | 2513783 |
| [the influence of temperature on the biology of triatominae. ix. rhodnius nasutus stal, 1859 (hemiptera, reduviidae)]. | the influence of temperature on the biology of rhodnius nasutus stal, 1859 (hemiptera, reduviidae) was studied in order to obtain a larger number of triatominae reared in laboratory to use in xenodiagnosis and to be able to get information for their proper control. the experiments were performed in two climatized chambers at 25 +/- 0.5 degrees c and 30 +/- 1 degrees c, 70 +/- 5% of relative humidity and photoperiod of 12 hours. data in relation to evolution cycle, period between emergency of adu ... | 1989 | 2520829 |
| [the resistance of fasting and nutritional aspects of triatoma lecticularia (stal, 1859) (hemiptera, reduviidae, triatominae)]. | the resistance to fasting of triatoma lecticularia was studied in all phases of the life cycle and the insect weighed in different nutritional situations (fed, not fed, death after starvation). the temperature and humidity levels were also recorded. the nymphal phases showed increasing resistance to fasting as demonstrated by the following averages (days) 1st 45.84; 2nd 61; 3rd 88.74; 4th 123.44; 5th 162.30. upon the adult phase, the averages were similar to those of the 3rd stage for the male i ... | 1989 | 2520831 |
| the effects of artificial diets on the anterior intestinal cell ultrastructure of rhodnius prolixus (hemiptera:reduviidae). | mated female rhodnius prolixus were fed diets of washed rabbit erythrocytes (rbc), rabbit plasma, edestin (a plant storage protein) in ringer's or ringer's solution alone. all diets contained 1 mm atp. the effects of these diets on anterior intestinal cell ultrastructure were evaluated and compared to changes induced by normal blood feeding. separation of basal labyrinth membranes was induced earlier after ringer's-feeding than with all other diets. normal modifications of the rough endoplasmic ... | 1989 | 2668208 |
| endpolyploidy and digestion in the midgut of rhodnius prolixus stål (hemiptera: reduviidae). | the feulgen-dna content of the midgut cell nuclei of rhodnius prolixus is estimated by microspectrophotometry. midgut cells contain 23.35-32.16 pg dna/nucleus, which represents an increase of up to 26c when compared to diploid r. prolixus brain tissue. a high copy number cell population disappears from the anterior intestinal cells after feeding, and the presence of a new population of low copy number cells indicates that there may be some regeneration of the midgut epithelium in adult insects, ... | 1989 | 2688578 |
| 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 |
| the surface morphology of the midgut cells of rhodnius prolixus stål (hemiptera: reduviidae) during blood digestion. | the surface morphology of the midgut cells of rhodnius prolixus is examined using scanning electron microscopy. before feeding, the microvilli are devoid of any extracellular structures and can be observed in both fracture faces and surface views. by 3 days after feeding, patches of extracellular membrane layers are observed on the surface of the midgut cells and by 7 days the extracellular membrane layers form an incomplete sheet overlying the microvilli, such that the microvilli are no longer ... | 1986 | 2882663 |
| morphometric analysis of rhodnius prolixus stal (hemiptera:reduviidae) midgut cells during blood digestion. | post-feeding ultrastructural modifications to the midgut cells of rhodnius prolixus are quantified using morphometry. changes in relative and absolute volumes and/or surface areas are demonstrated for the whole cells, nuclei, mitochondria, rough endoplasmic reticulum, lysosomes, golgi apparatus, storage vesicles, glycogen, microvilli, and basal labyrinth, before and during blood digestion. these parameters are separately determined for cells from each of the three midgut regions, and are correla ... | 1988 | 3043761 |
| [ultrastructural aspects of the corpus cardiacum, corpus allatum and aorta of panstrongylus megistus (hemiptera: reduviidae)]. | | 1988 | 3070650 |
| [feeding and defecation patterns in 5th instar nymphs of 4 species of triatomines (rhodnius prolixus, triatoma pallidipennis, t. infestans and t. brasiliensis, hemiptera, reduviidae)]. | | 1988 | 3071060 |
| [geographic distribution of triatoma vitticeps stal, 1859 (hemiptera, reduviidae) in the state of rio de janeiro, brazil]. | | 1986 | 3077191 |
| 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 |
| [biology of triatoma vitticeps (stal, 1859) under laboratory conditions (hemiptera: reduviidae: triatominae). i. evolutive cycle]. | observations were made on the evolutive cycle of triatoma vitticeps, held under laboratory conditions and fed weekly in mice. of the 435 eggs obtained, from 4 virgin couples, 149 were purposed for the biological cycle study and 286 to evaluate their resistance to starvation, which shall be a second part of this work. only 50 specimens reached the adult stage in a period of means (s) = 270 +/- 45 days. at the incubation time, the first and second instars were of less than a month for each, while ... | 1988 | 3078351 |
| naturally occurring lectins in the haemolymph of panstrongylus megistus (hemiptera: reduviidae). | | 1988 | 3078352 |
| rhodnius pallescens (hemiptera: reduviidae) in costa rica. | | 1986 | 3090267 |
| [method of biological control of triatominae, vectors of chagas disease, using entomopathogenic hyphomycetes. preliminary study]. | bioassays determined the pathogenic activity of 14 strains of 5 entomopathogenic hyphomycetous species (fungi imperfecti), beauveria bassiana, beauveria brongniartii, metarhizium anisopliae, nomuraea rileyi and paecilomyces fumosoroseus to rhodnius prolixus. treatments consisted of direct spraying with conidial titrated suspensions on first instar larvae. when tested at 3 x 10(5) conidia/cm2, only 2 strains, b. bassiana n. 297 and b. bassiana n. 326 killed 100% of larvae at 10 days post-exposure ... | 1987 | 3111731 |
| 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 |
| differences in binding of lectin-gold conjugates by trypanosoma cruzi and blastocrithidia triatomae (trypanosomatidae) in the intestine of triatoma infestans (reduviidae). | two species of trypanosomatid flagellates, trypanosoma cruzi and blastocrithidia triatomae which develop in the intestine of triatoma infestans, were incubated with lectin-gold conjugates to demonstrate sugar components of the cell surface with the electron microscope. t. cruzi, strain "chile 5" (zymodeme 1), bound sba-gold, revealing n-acetyl-galactosamine and/or galactose residues. wga-bsa-gold, specific for n-acetylglucosamine, did not bind to the surface of this flagellate. on the other hand ... | 1987 | 3125542 |
| [biomorphogenetic changes caused by the application of precocene ii in nymphs of triatoma infestans (klug, 1834) (hemiptera, reduviidae, triatominae)]. | the morphogenetic effect of precocene ii on 4th instar nymphs of triatoma infestans was examined. topical treatment with precocene ii (200, 300 and 400 micrograms/nymph) induced the formation of adultoids with the following characteristics: rudimentary wings, three segmented tarsi, ocelli, deformed genitalia and mouth-parts and testes with intermediary development. precocene ii also increases the duration of the molting cycle. the survival of the adultoid insects was related to the inverse of th ... | 1986 | 3295468 |
| [experimental infection of triatoma infestans (hemiptera: reduviidae) with leptospira icterohaemorrhagiae and its transmission to laboratory mammals]. | | 1986 | 3296076 |
| [antidiuretic mechanism in rhodnius prolixus (stal, 1859) (hemiptera, reduviidae)]. | an antidiuretic mechanism is proposed for rhodnius prolixus, whose activity is manifested when the diuretic phase has terminated and is maintained until the insect has fed again. presumably this mechanism acts at the level of the proximal rectal sphincter and is inhibited by ingestion, mechanical distension of the gut and central disinhibition by decapitation. it is suggested that the antidiuretic activity is maintained by the nervous system and is modified when there is distention of the gut or ... | 1986 | 3302595 |
| polyploidization of the btc-32 cell line from triatoma infestans (hemiptera, reduviidae). | the cytophotometric evaluation of the feulgen-dna content of the btc-32 cells at passage 160 after 6 days of growth demonstrated that polyploidy is relatively frequent in this cell line. 4c values were assumed to pertain to diploid nuclei at the s or g2 phases but also to polyploid nuclei at the g1 phase. polyploidy in 4c nuclei is assumed to be attained by endomitosis. however, there are morphological indications that polyploidization in cells with an 8c-128c feulgen-dna content could result fr ... | 1987 | 3333490 |
| 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 |
| [vital statistics of rhodnius neivai lent, 1953 (hemiptera: reduviidae) under experimental conditions]. | a statistical evaluation of the population dynamics of r. neivai is based on six cohorts experiments conducted under controlled laboratory conditions. two blood sources were offered to animals: rabbit and hen. egg hatching, nymphal development time and mortality, adult longevity and age-specific mortality, female age-specific fecundity and fertility were determined. in addition, some population parameters were evaluated, such as: life expectancy, intrinsic rate of natural increase, net reproduct ... | 1987 | 3333946 |
| 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 |
| the prevalence of allergic sensitization to triatoma protracta (heteroptera: reduviidae) in a southern california, usa, community. | | 1986 | 3517333 |
| evidence for the presence of sex and aggregation pheromones from triatoma mazzottii (hemiptera: reduviidae). | | 1986 | 3522687 |
| species-specific allergens from the salivary glands of triatominae (heteroptera:reduviidae). | we investigated allergenic cross-reactivity among species of the blood-feeding insects of the subfamily triatominae. by skin testing, patients allergic to either triatoma protracta or t. rubida gave positive responses only to the respective salivary antigen. rast-inhibition experiments demonstrated that binding of ige antibodies to t. protracta antigen was not inhibited by salivary extracts from t. rubida, t. cavernicola, t. rubrofasciata, or rhodnius prolixus. the same level of species specific ... | 1986 | 3531291 |
| identification and partial purification of species-specific allergens from triatoma protracta (heteroptera:reduviidae). | this article describes the immunochemical characterization of allergens from triatoma protracta, a hematophagous insect that causes ige-mediated anaphylactic reactions when it bites sensitized allergic persons. comparison of the allergenic potency of t. protracta salivary gland extract, thoracic and abdominal hemolymph, and a whole body extract by rast inhibition demonstrated that salivary glands were the main source of t. protracta allergens. concentrated salivary gland extracts were purified b ... | 1986 | 3531292 |
| observations on the feeding habits of triatoma rubrofasciata (hemiptera: reduviidae) | | 1986 | 3538526 |
| 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 |
| predation on rhodnius prolixus (hemiptera: reduviidae) by the spider theridion rufipes (araneida: theridiidae). | | 1987 | 3546692 |
| isozyme evidence of lack of speciation between wild and domestic triatoma infestans (heteroptera: reduviidae) in bolivia. | | 1987 | 3546693 |
| small nonoccluded viruses from triatomine bug triatoma infestans (hemiptera: reduviidae). | | 1987 | 3549911 |
| laboratory repellent tests against rhodnius prolixus (heteroptera: reduviidae). | | 1985 | 3884812 |
| [study of 11 enzymes and formal genetic findings for 19 enzymatic loci in triatoma infestans (hemiptera: reduviidae)]. | | 1985 | 3907524 |
| parasitism of telenomus costalimai (hymenoptera: scelionidae) on rhodnius prolixus (hemiptera: reduviidae) under laboratory conditions: effects of density. | | 1985 | 3908680 |
| feeding, molting, and egg production in rhodnius prolixus (hemiptera: reduviidae) fed repeatedly on the same swiss mouse hosts. | | 1985 | 3908681 |
| effect of fasting on trypanosoma cruzi infection in triatoma dimidiata (hemiptera: reduviidae). | | 1985 | 3908682 |
| [a new plasminogen activator isolated from the saliva of rhapactor biparticeps (heteroptera, reduviidae): biological and physicochemical properties]. | a new plasminogen activator has been isolated from the saliva of rhapactor biparticeps. this product is 5% of salivary proteins and acts at an optimal ph of 7.8.p.d.f which results from its action on human fibrinogen are similar to those which are obtained with streptokinase. the modalities of action of this plasminogen activator on the fibrinogen are discussed. | 1985 | 3911919 |
| trypanosoma cruzi: association between seroreactivity of children and infection rates in domestic panstrongylus megistus (hemiptera: reduviidae). | | 1985 | 3920395 |
| [isoenzymatic studies of the principal vector of chagas disease: triatoma infestans (hemiptera: reduviidae)]. | | 1985 | 3931581 |
| vital statistics of triatominae (hemiptera: reduviidae) under laboratory conditions. i. triatoma infestans klug. | | 1972 | 4559948 |
| prevalence of trypanosoma cruzi and trypanosoma rangeli in triatomines (hemiptera: reduviidae) collected in the republic of panama. | | 1973 | 4567850 |