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Search Results: 1 - 10 of 200744 matches for " Damborsky Miryam P. "
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Presencia de Triatoma sordida St?l, 1859 en ecotopos urbanos de la ciudad de Corrientes, Argentina
Bar,María E.; Oscherov,Elena B.; Damborsky,Miryam P.;
Revista de Saúde Pública , 1993, DOI: 10.1590/S0034-89101993000200007
Abstract: with the intention of verifying the presence of t. sordida st?l 1859 in urban ecotopes in corrientes city, argentina, both, human dwellings and an extradomiciliary habitat were taken as a basis. a complete t. sordida population census was carried on in mitre park pigeon house and 400 pigeon nests (columbia livia) were dissected. the triatomineos samples that had been detected in human dwellings were sent to the arthropods laboratory by their inhabitants. these triatomineos were classified systematically and according to their age class. their feces were examined under a microscope 400 x, so as to identify trypanosoma cruzi. six eggs, 45 first-instar nymphs, 110 second-instar nymphs, 226 third-instar nymphs, 303 fourth-instar nymphs, 1.103 fifth-instar nymphs, 12 females and 11 males were collected from the pigeon house. the presence of this species was verified in the 27 houses, situated in 8 different neighborhoods in the city; 13 eggs, 33 different instar nymphs, 27 females and 9 males were captured, 82 samples altogether. no triatomineo was infected by t. cruzi. t. sordida, adults moved towards the houses in spring and summer. of the material found in human dwellings 33% was female. the adaptation of t. sordida to extra-domestic habitats and their tenfency to invade human houses has thus been verified. this fact should be taken into account in vector control programs.
Life cycle and reproductive patterns of Triatoma rubrovaria (Blanchard, 1843) (Hemiptera: Reduviidae) under constant and fluctuating conditions of temperature and humidity
Damborsky, Miryam P.;Bar, María E.;Gorla, David;
Revista da Sociedade Brasileira de Medicina Tropical , 2005, DOI: 10.1590/S0037-86822005000500014
Abstract: the aim of this study was to evaluate the temperature and relative humidity influence in the life cycle, mortality and fecundity patterns of triatoma rubrovaria. four cohorts with 60 recently laid eggs each were conformed. the cohorts were divided into two groups. in the controlled conditions group insects were maintained in a dark climatic chamber under constant temperature and humidity, whereas triatomines of the ambiental temperature group were maintained at room temperature. average incubation time was 15.6 days in the controlled conditions group and 19.1 days in the ambiental temperature. in group controlled conditions the time from egg to adult development lasted 10 months while group ambiental temperature took four months longer. egg eclosion rate was 99.1% and 98.3% in controlled conditions and ambiental temperature, respectively. total nymphal mortality in controlled conditions was 52.6% whereas in ambiental temperature was 51.8%. mean number of eggs/female was 817.6 controlled conditions and 837.1 ambiental temperature. fluctuating temperature and humidity promoted changes in the life cycle duration and in the reproductive performance of this species, although not in the species mortality.
Life cycle and reproductive patterns of Triatoma rubrovaria (Blanchard, 1843) (Hemiptera: Reduviidae) under constant and fluctuating conditions of temperature and humidity
Damborsky Miryam P.,Bar María E.,Gorla David
Revista da Sociedade Brasileira de Medicina Tropical , 2005,
Abstract: The aim of this study was to evaluate the temperature and relative humidity influence in the life cycle, mortality and fecundity patterns of Triatoma rubrovaria. Four cohorts with 60 recently laid eggs each were conformed. The cohorts were divided into two groups. In the controlled conditions group insects were maintained in a dark climatic chamber under constant temperature and humidity, whereas triatomines of the ambiental temperature group were maintained at room temperature. Average incubation time was 15.6 days in the controlled conditions group and 19.1 days in the ambiental temperature. In group controlled conditions the time from egg to adult development lasted 10 months while group ambiental temperature took four months longer. Egg eclosion rate was 99.1% and 98.3% in controlled conditions and ambiental temperature, respectively. Total nymphal mortality in controlled conditions was 52.6% whereas in ambiental temperature was 51.8%. Mean number of eggs/female was 817.6 controlled conditions and 837.1 ambiental temperature. Fluctuating temperature and humidity promoted changes in the life cycle duration and in the reproductive performance of this species, although not in the species mortality.
Presencia de Triatoma sordida St l, 1859 en ecotopos urbanos de la ciudad de Corrientes, Argentina
Bar María E.,Oscherov Elena B.,Damborsky Miryam P.
Revista de Saúde Pública , 1993,
Abstract: Con el objeto de verificar la presencia de T. sordida St l 1859, en ecotopos urbanos de la ciudad de Corrientes, Argentina se tomaron como base un habitat extradomiciliario y la vivienda humana. En el palomar situado en el Parque Mitre fue realizado un censo completo de población de T. sordida para lo cual fueron disecados 400 nidos de paloma (Columbia livia). Los ejemplares de triatominos detectados en las viviendas fueron enviados por los pobladores al Laboratorio de Artrópodos. Los triatominos fueron determinados sistemáticamente y por clase de edad. La materia fecal de los mismos fue examinada al microscopio para la identificación del Trypanosoma cruzi. En el palomar se colectaron: 6 huevos, 45 ninfas de primer estadío, 110 ninfas de segundo estadío, 226 ninfas de tercer estadío, 303 ninfas de cuarto estadío, 1.103 ninfas de quinto estadío, 12 hembras y 11 machos. Se constató la presencia de esta especie en 27 viviendas localizadas en 8 barrios de la Ciudad. Se capturaron 13 huevos, 33 ninfas de diferentes estadíos, 27 hembras y 9 machos, totalizando 82 individuos. Ningún triatomino resultó infectado por T. cruzi. Los adultos de T. sordida se desplazaron hacia el domicilio en primavera y verano. Es de destacar que el 33% del material hallado en las viviendas correspondió a hembras. Se ha comprobado la adaptación de T. sordida a un habitat extradomiciliario y su tendencia a invadir la vivienda humana, hecho que se debería ser tenido en cuenta en los programas de control de vectores.
Epidemiología de la enfermedad de Chagas en San Roque, Corrientes: Infestación por triatominos y seroprevalencia humana
Bar,María E.; Damborsky,Miryam P.; Oscherov,Elena B.; Wisnivesky-Colli,Cristina;
Medicina (Buenos Aires) , 2005,
Abstract: this investigation was aimed to evaluate triatomine colonization in domestic and extradomestic ecotopes located around a palm community, to determine triatomines infection index and to obtain human seroprevalence rates. samplings were performed in spring 1998 and summer 1999 in colonia laurel, department san roque, corrientes, argentina. timed-collection of triatomines (man/hour method) was performed. trypanosoma cruzi identity was determined by morphological criteria and by pcr. indirect hemagglutination and indirect immunofluorescence antibody tests were used for detection of t. cruzi infection in human volunteers. sixteen human dwellings were analized, 11 resulted infested by triatoma infestans and two by triatoma sordida. a total of 122 t. infestans of all age classes were collected and t. cruzi infection was recorded in 16.7%. triatoma infestans was confirmed as the predominant species in the domicile and t. sordida in the peridomicile. diagnosis of chagas disease infection was performed in 77.9% (88/113) of the inhabitants and the prevalence was 26.1%. a relatively high infection rate was observed in the 0-10 age group. seropositives percentages increased with age and reached 66.6% in older than 40 years. presence of t. infestans, human seroreactivity to t. cruzi, < 4 year old seropositives and precarious life conditions prove that this endemic disease is still a problem in the studied area.
Estadísticos poblacionales de Triatoma sordida St?l 1859 (Hemiptera : Reduviidae) en condiciones experimentales
Oscherov,Elena B.; Damborsky,Miryam P.; Bar,María E.; Porcel,Eduardo;
Revista de Saúde Pública , 1996, DOI: 10.1590/S0034-89101996000500006
Abstract: four cohorts of 100 triatoma sordida eggs were reared under standard laboratory conditions (28oc, 63% r.h.) and fed weekly on hens during 40 minutes. the numbers of dead insects, moults and eggs laid were recorded weekly. a constant survival value was observed without any important peaks in the four cohorts. life expectancy was 37.4 weeks for males and 36.8 weeks for females. the average generation time was 61.7 weeks. the average net reproduction rate suggests that this population would increase 143.2 times during each generation. the average intrinsic rate of natural increase was 0.082 per individual per week. the highest reproductive value was observed 3 weeks after entering the adult stage. the age structure, assuming stable age distribution, would be 32% eggs, 26% of first instar nymphs, 19% of second instar nymphs, 13% of third instar nymphs, 6% of fourth instar nymphs, 3% of fifth instar nymphs and 1% of adults. our results suggest that this species behaves as a k-strategist under experimental conditions.
Estadísticos poblacionales de Triatoma rubrovaria en condiciones de laboratorio
Oscherov,Elena B; Bar,María E; Damborsky,Miryam P; Milano,Alicia M F;
Revista de Saúde Pública , 2005, DOI: 10.1590/S0034-89102005000200011
Abstract: objective: to obtain t. rubrovaria population parameters in order to describe its demographic characteristics. methods: the study was carried out in the laboratory of arthropods, corrientes, argentina, from october 2000 to february 2003. eggs were grouped to form five 100-egg cohorts. insects were fed on chickens (gallus domesticus). the cohorts were monitored weekly and kept under controlled temperature (28±3°c) and relative humidity (63±10%). a life table was constructed and other vital statistics were calculated and recorded. results: higher mortality was recorded in the first through the fourth nymphal stadium. a constant decrease was seen from the fifth nymphal instar. life expectancy dropped linearly after overcoming the critical stages. adults mean survival was 50.2 weeks. the first oviposition was after 40.6 weeks. the fecundity was 859.6 eggs with an average 22.8 eggs per female. the reproductive period was 37.7 weeks. the generation time was 55.3 weeks and the net reproduction rate was 133.7. the intrinsic rate of weekly increment was 0.088. in a stable age distribution the population would be composed of 25.3% eggs, 72.3% nymphs and 2.4% adults. adults accounted for more than 70% of the total reproductive value. conclusions: triatoma rubrovaria had a long survival as imago, a late first reproduction and a low intrinsic rate of natural increase.
Registros y distribución de la especie afroasiática Digitonthophagus gazella (Coleoptera: Scarabaeidae: Scarabaeinae) en Argentina
álvarez Bohle,María C.; Damborsky,Miryam P.; Bar,María E.; Ocampo,Federico C.;
Revista de la Sociedad Entomol?3gica Argentina , 2009,
Abstract: the occurrence of the dung beetle digitonthophagus gazella fabricius (coleoptera: scarabaeidae) is reported for the first time for argentina. the record of this species represents an extension of its geographical range in south america. this species of afro asian origin was captured by manual collection in cattle dung, light traps, and dung baited pitfall traps in six provinces of northern and central argentina between 2006 and 2009.
Comunidad de escarabajos copronecrófagos (Coleoptera: Scarabaeidae) en dos bosques del Chaco Oriental Húmedo, Argentina
Damborsky,Miryam P.; Bar,María E.; álvarez Bohle,María C.; Oscherov,Elena B.;
Revista de la Sociedad Entomol?3gica Argentina , 2008,
Abstract: scarabaeinae community structure was compared in two habitats with different degrees of conservation: a native forest at pampa del indio provincial park, and a forest fragment at los alisos cattle farm. pitfall traps baited with carrion and cattle dung were left open for 72-hour periods in october, november and december 2006. 769 adults belonging to six tribes, 11 genera and 26 species were captured in all. at los alisos, ontherus sulcatus fabricius and onthophagus hirculus mannerheim were the dominant species. trichillum sp., canthon podagricus harold, malagoniella sp., gromphas lacordairei brullé, and two dichotomius hope species were only found at los alisos, whereas canthon septemmaculatus latreille and coprophanaeus jasius olivier were exclusively collected in pampa del indio. number of individuals and diversity were significantly higher at pampa del indio. the same proportions of coprophagous and necrophagous species were captured at los alisos, with most having endocoprid and paracoprid habits. pampa del indio was characterized by the presence of rollers and necrophagous species. this research is the first study of forest scarabaeinae biodiversity in chaco province.
Patrones de alimentación y de defecación de Triatoma rubrovaria (Heteroptera: Reduviidae) bajo condiciones de laboratorio
Bar,María E.; Milano,Alicia M. F.; Damborsky,Miryam P.; Oscherov,Elena B.; Avalos,Gilberto;
Revista de la Sociedad Entomol?3gica Argentina , 2003,
Abstract: triatoma rubrovaria blanchard capability to colonize the domicile, to feed upon human and its trypanosoma cruzi chagas infection rates justify this investigation. the aim was to characterize the feeding and defecation patterns of t. rubrovaria under laboratory conditions. both patterns were evaluated simultaneously using 30 fourth-instar and 30 fifth-instar nymphs, and 30 adults. three repetitions for each nymphal stadium and for the adult stage were made. the insects were fed on chicken during one hour and were weighed before and after feeding, and the blood meal size was determined. the time of the first and subsequent defaecations were measured. it was confirmed blood ingestion in 97.0% of the triatomines and 84.7% fed to repletion. on average the attack time started after 2 minutes. feeding interruption was observed in 28.6% and was due principally to defecate or as a consequence of host irritability. the mean amount of blood obtained by the fifth-instar nymphs was greater than the blood ingested by the fourth-instar (358.1 and 120.9 mg, respectively) and the adults (73.5 mg). defecation was verified in the 92.4% of the feeding individuals. the first dejection was emitted on average at 1.7 minutes. it is concluded that t. rubrovaria was fast to obtain its bloodmeal and to emitt the first dejection. its potential as t. cruzi vector is discussed.
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