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Search Results: 1 - 10 of 207470 matches for " Jazmín Yesenia;Nogueda-Torres "
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Influence of temperature and humidity on the biology of Triatoma mexicana (Hemiptera: Reduviidae: Triatominae) under laboratory conditions
Martínez-Ibarra, José Alejandro;Salazar-Schettino, Paz María;Solorio-Cibrián, Miriam;Cabrera Bravo, Margarita;Novelo-López, Mónica;Vences, Mauro Omar;Montes-Ochoa, Jazmín Yesenia;Nogueda-Torres, Benjamín;
Memórias do Instituto Oswaldo Cruz , 2008, DOI: 10.1590/S0074-02762008000700015
Abstract: several biological parameters related to the triatoma mexicana life-cycle were evaluated in this study. three cohorts were maintained under different combinations of temperature and relative humidity (rh): 25oc/50% rh; 25oc/75% rh; and 30oc/75% rh. observed hatching rates varied from 49-57.5% whereas the average time of hatching varied from 19.5-22.7 days. in the three cohorts studied, the mean time-lapse between presentation of the blood meal and the beginning of feeding was less than 5 min in all instars; the mean feeding time was longer than 10 min in all the instars; the post-feed defecation delay was over 10 min in all the instars. less than 50% of nymphs in each cohort completed the cycle and the average time from 1st instar nymph to adult was more than 255 days for the three cohorts. the number of blood meals before molt at each nymphal instar varied from 1-9. our results appear to indicate a lack of influence of temperature and rh on the biological parameters of t. mexicana that were studied, which could reflect the adaptation capacity of this species. we also conclude that t. mexicana can not be considered an effective transmitter of trypanosoma cruzi to human populations in areas where this species is currently present.
Activity and Residual Effect of Two Formulations of Lambdacyhalothrin Sprayed on Palm Leaves to Rhodnius prolixus
,,,Ramírez-San Juan Eduardo,Alejandre-Aguilar Ricardo,Nogueda-Torres Benjamín
Memórias do Instituto Oswaldo Cruz , 2002,
Abstract: The insecticidal activity and residual effect of two formulations of lambdacyhalothrin were evaluated with Rhodnius prolixus;laboratory and field tests were conducted in the State of Chiapas, Mexico. The results indicate that the lethal concentrations of the active ingredient of SC (LC50 = 2.37 and LC90 = 8.5 mg, a.i./m2) were 4-8 times than those with the insecticide WP applied on R. prolixus bugs in palm leaves, a common building material for thatched roofs. Other investigators in South America recommended applying 30 mg a.i./m2 in porous materials; we obtained that the products WP and SC were 3.5 and 16 times more effective on palm leaves. Regarding the evaluation of the residual effects in field spraying, there was up to 15 months persistence after the application of WP in two doses (8.6 mg a.i./m2 and 3.752 mg a.i./m2) with SC. We consider R. prolixus highly susceptible to the employed pyrethroids; they could be used to control this vector in the state of Chiapas, Mexico.
Development of genital plates in nymphs of Triatoma pallidipennis, St l 1872, (Hemiptera: Reduviidae) and its application as sexing method
Rodríguez-Sánchez Milton,Alejandre-Aguilar Ricardo,Nogueda-Torres Benjamín,Camacho Alejandro D
Memórias do Instituto Oswaldo Cruz , 2003,
Abstract: Searching for morphometric differences between sexes in immature forms, the development of genital plates in the exuviae of Triatoma pallidipennis St l 1872nymphs was studied. Differences were found in the form and size of the 9th genital urosternite, it is larger and wider in males as compared to females. This difference is reported in several South American Triatoma species. From our results it is possible to sex early stages from microscopic observation of genital plates in whole insects.
Development of genital plates in nymphs of Triatoma pallidipennis, St?l 1872, (Hemiptera: Reduviidae) and its application as sexing method
Rodríguez-Sánchez, Milton;Alejandre-Aguilar, Ricardo;Nogueda-Torres, Benjamín;Camacho, Alejandro D;Martín-Frías, Eliézer;
Memórias do Instituto Oswaldo Cruz , 2003, DOI: 10.1590/S0074-02762003000600012
Abstract: searching for morphometric differences between sexes in immature forms, the development of genital plates in the exuviae of triatoma pallidipennis st?l 1872nymphs was studied. differences were found in the form and size of the 9th genital urosternite, it is larger and wider in males as compared to females. this difference is reported in several south american triatoma species. from our results it is possible to sex early stages from microscopic observation of genital plates in whole insects.
Activity and Residual Effect of Two Formulations of Lambdacyhalothrin Sprayed on Palm Leaves to Rhodnius prolixus
Mazariego-Arana, Miguel Angel;Ramírez-San Juan, Eduardo;Alejandre-Aguilar, Ricardo;Nogueda-Torres, Benjamín;
Memórias do Instituto Oswaldo Cruz , 2002, DOI: 10.1590/S0074-02762002000300014
Abstract: the insecticidal activity and residual effect of two formulations of lambdacyhalothrin were evaluated with rhodnius prolixus;laboratory and field tests were conducted in the state of chiapas, mexico. the results indicate that the lethal concentrations of the active ingredient of sc (lc50 = 2.37 and lc90 = 8.5 mg, a.i./m2) were 4-8 times than those with the insecticide wp applied on r. prolixus bugs in palm leaves, a common building material for thatched roofs. other investigators in south america recommended applying 30 mg a.i./m2 in porous materials; we obtained that the products wp and sc were 3.5 and 16 times more effective on palm leaves. regarding the evaluation of the residual effects in field spraying, there was up to 15 months persistence after the application of wp in two doses (8.6 mg a.i./m2 and 3.752 mg a.i./m2) with sc. we consider r. prolixus highly susceptible to the employed pyrethroids; they could be used to control this vector in the state of chiapas, mexico.
Vigilancia de la presencia de triatominos mediante gallineros en el sur de Jalisco, México
Martínez-Ibarra,José Alejandro; Martínez-Grant,Jorge Alejandro; Verdugo-Cervantes,Miguel Roberto; Bustos-Salda?a,Rafael; Nogueda-Torres,Benjamín;
Biomédica , 2010,
Abstract: introduction. chagas disease is an important public health problem in mexico. at least 30 triatominae species, vectors of that disease have been recorded, most with domiciliary habits and tendency to invade human dwellings. objective. the usefulness of using chicken coops was evaluated for monitoring peridomestic triatomine presence, identity and infection with trypanosoma cruzi. materials and methods. a year-long, longitudinal field study was designed. fifty chicken coops were placed in 50 human dwellings on three localities in teocuitatlán de corona county, jalisco state, mexico. the coops and human dwellings were routinely inspected to determine if the coops alone can monitor for the presence of triatomines. results. significantly (p<0.05) more meccus longipennis specimens (93.0%) than of triatoma barberi (7.0%) were collected. almost a third (31.3%) of m. longipennis and none of t. barberi specimens were collected in the coops. meccus longipennis was found with infections of trypanosoma cruzi of 25.7%, and t. barberi of 53.2%. most triatomines were collected in spring and summer months. conclusions. chicken coops proved useful tools to detect presence of m. longipennis; however, they were not effective for t. barberi. the importance of m. longipennis as a potential vector was confirmed, and the possible primary vector role of t. barberi was established as well.
Role of two Triatoma (Hemiptera: Reduviidae: Triatominae) species in the transmission of Trypanosoma cruzi (Kinetoplastida: Trypanosomatidae) to man in the West Coast of Mexico
Martínez-Ibarra José Alejandro,Bárcenas-Ortega Nina Malena,Nogueda-Torres Benjamín,Alejandre-Aguilar Ricardo
Memórias do Instituto Oswaldo Cruz , 2001,
Abstract: From August 1997 to August 1998, 334 specimens of Triatoma longipennis and 62 of T. picturata were collected in four groups of localities placed in the zone from Guadalajara, Jalisco to Tepic, Nayarit, in the West Coast of Mexico. Most T. longipennis were collected outdoors (69.2%) while most T. picturata (58.1%) were collected indoors. All collected specimens were examined for Trypanosoma cruzi infection, which was detected on 98 (29.3%) T. longipennis and 17 (27.4%) T. picturata. This study confirms the role of T. longipennis and T. picturata as some of the main T. cruzi vectors to humans in Mexico. Habitation Infestation Rate with T. longipennis was of 0.09 and with T. picturata was of 0.03 and the predominating ecotopes were pile of blocks, chicken coops, pigsties, wall crawls and beds.
Biology of three species of the Meccus phyllosomus complex (Hemiptera: Reduviidae: Triatominae) fed on blood of hens and rabbits
Martínez-Ibarra, José Alejandro;Alejandre-Aguilar, Ricardo;Torres-Morales, Alfredo;Trujillo-García, Josefina Cecilia;Nogueda-Torres, Benjamín;Trujillo-Contreras, Francisco;
Memórias do Instituto Oswaldo Cruz , 2006, DOI: 10.1590/S0074-02762006000700014
Abstract: aspects related to hatching, life time, number of blood meals to molt, mortality, feeding time and postfeed defecation delay for each instar of meccus phyllosomus, m. mazzottii, and m. bassolsae, life-cycle were evaluated and compared in two cohorts of each of those three species, fed on hens or rabbits. no significant (p > 0.05) differences were recorded among cohorts fed on hens respect to cohorts fed on rabbits in m. phyllosomus and m. mazzottii and the average time of hatching was 21.5 days for cohorts fed on hens and 22.5 for cohorts fed on rabbits. average egg-to-adult development times were no significant (p > 0.05) different between both cohorts of m. phyllosomus and m. mazzotti, independent of the blood meal source. the average span in days for each instar fed on hens was not significantly different to the average span for each instar fed on rabbits, when comparisons were made by species. the number of blood meals at each nymphal instar varied from 1 to 6 in both cohorts of each species. the mortality rates were higher on older nymphs, in both cohorts of m. phyllosomus and m. bassolsae, whereas they were higher on first instar nymphs on m. mazzottii. mean feeding time was no significant (p > 0.05) different in triatomines fed on hens or fed on rabbits, when each species were compared separately. a similar number of nymphs of each cohort, completed the cycle. defecation delay was no significant (p > 0.05) different when cohorts fed on hens and fed on rabbits were compared by species. most of the studied parameters showed no significant (p > 0.05) differences among those cohorts fed on hens and for fed on rabbits, which could mean a high degree of association of those species with birds as much as mammals, under wild conditions, increasing their capacity to colonize human dwellings.
The biology of three Mexican-American species of Triatominae (Hemiptera: Reduviidae): Triatoma recurva, Triatoma protracta and Triatoma rubida
Martínez-Ibarra, José Alejandro;Paredes-González, Edgar;ángel-Licón-Trillo,;Monta?ez-Valdez, Oziel Dante;Rocha-Chávez, Gonzalo;Nogueda-Torres, Benjamín;
Memórias do Instituto Oswaldo Cruz , 2012, DOI: 10.1590/S0074-02762012000500013
Abstract: the values of biological parameters related to hatching, lifespan, the number of blood meals between moults, mortality, time lapse before the beginning of feeding, feeding time and defecation delay for each instar of three mexican-american species of triatominae, triatoma recurva, triatoma protracta (former subspecies protracta) and triatoma rubida (former subspecies uhleri), were evaluated and compared. no significant (p > 0.05) differences were recorded among the three species with respect to the average time required to hatch. this time was approximately 19 days. the average egg-to-adult development time was significantly (p < 0.05) shorter for t. rubida. the number of blood meals at each nymphal instar varied from one-five for each species. the mortality rates were higher for the first-instar nymphs of the three species studied. the mean time lapse before the beginning of feeding was between 0.3-3 min for most nymphs of all instars of each species studied. the mean feeding time was the longest for t. recurva, followed by t. protracta. the defecation delay was less than 10 min for t. recurva and t. rubida. given these results, only t. rubida should be considered an important potential vector of trypanosoma cruzi transmission to humans in areas of mexico where these species exist, whereas t. recurva and t. protracta would be of secondary importance.
Infección natural por Trypanosoma cruzi en triatominos del Centro y Norte de México
Licón-Trillo,Angel; Balsimelli-De La Pe?a,Karina; Acosta-Legarda,Manuela; Leal-Berumen,Irene; Nogueda-Torres,Benjamín; Martínez-Ibarra,José Alejandro;
Boletín de Malariología y Salud Ambiental , 2010,
Abstract: on this study are reported some collections of triatomines from the mexican states of chihuahua and aguascalientes, where recent data about vector infection by trypanosoma cruzi was not available. in the state of chihuahua only adult specimens of triatoma recurva and of meccus phyllosomus longipennis were collected. percentages of infection by t. cruzi were respectively 5.17% and 12.5%. in the state of aguascalientes adult as well nymph specimens of m. p. longipennis were collected. percentage of infection by t. cruzi reached 96.7%. our results show a null colonization of human dwellings by triatomines in the study area of the state of chihuahua, as well as low risk of infection by t. cruzi for the inhabitants of that area. on the other hand, in the study area in the state of aguascalientes, the risk of infection by t. cruzi was high for inhabitants of the area. complementary entomological studies are necessary to establish the proper risk of infection by vectorial transmission of t. cruzi to human and animal reservoir host in the two studied areas.
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