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Search Results: 1 - 10 of 33780 matches for " Martínez-Ibarra "
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Biology of Triatoma pallidipennis stal 1945 (Hemiptera: Reduviidae:Triatominae) under laboratory conditions
Martínez-Ibarra, José Alejandro;Katthain-Duchateau, Gala;
Memórias do Instituto Oswaldo Cruz , 1999, DOI: 10.1590/S0074-02761999000600023
Abstract: aspects related to hatching, life time, mortality, feeding behaviour and fecundity for each stage of triatoma pallidipennis life-cycle were evaluated. the hatching rate observed for 200 eggs was 60% and the average time of hatching was 18 days. eighty nymphs (n) (40%) completed the cycle and the average time from ni to adult was 168.7±11.7days. the average span in days for each stage was 18.0 for ni, 18.5 for nii, 30.0 for niii, 35.7 for niv and 50.1 for nv. the number of bloodmeals at each nymphal stage varied from 1 to 5. the mortality rate was 9.17 for ni, 5.5 for nii, 6.8 for niii 4.17 for niv and 13.04 for nv nymphs. the average number of eggs laid per female in a 9-month period was 498.6. the survival rates of adults were 357±217.9 and 262.53±167.7 for males and females respectively.
Biology of Triatoma pallidipennis stal 1945 (Hemiptera: Reduviidae:Triatominae) under laboratory conditions
Martínez-Ibarra José Alejandro,Katthain-Duchateau Gala
Memórias do Instituto Oswaldo Cruz , 1999,
Abstract: Aspects related to hatching, life time, mortality, feeding behaviour and fecundity for each stage of Triatoma pallidipennis life-cycle were evaluated. The hatching rate observed for 200 eggs was 60% and the average time of hatching was 18 days. Eighty nymphs (N) (40%) completed the cycle and the average time from NI to adult was 168.7±11.7days. The average span in days for each stage was 18.0 for NI, 18.5 for NII, 30.0 for NIII, 35.7 for NIV and 50.1 for NV. The number of bloodmeals at each nymphal stage varied from 1 to 5. The mortality rate was 9.17 for NI, 5.5 for NII, 6.8 for NIII 4.17 for NIV and 13.04 for NV nymphs. The average number of eggs laid per female in a 9-month period was 498.6. The survival rates of adults were 357±217.9 and 262.53±167.7 for males and females respectively.
Pathological alterations and prevalence of Trypanosoma cruzi in opossums from western Mexico
Villagrán,Maria Elena; Martínez-Ibarra,José Alejandro; de Diego,José Antonio;
Boletín de Malariología y Salud Ambiental , 2011,
Abstract: there are scarce reports about lesions and pathological alterations by trypanosoma cruzi infections on opossums (didelphis virginiana), considered some of the most important reservoir hosts for t. cruzi in western mexico. after two serological analyses (serodia and iha), 12 (24%) of 50 collected opossums in two small towns in western mexico were positive for the presence of t. cruzi. eight had some kind of organ alterations: four with alterations in only one organ, three in two organs and one with alterations in three organs. splenomegaly was the most common alteration in the examined opossums. in light of the present findings, it is possible that organ alterations on studied opossums may have been associated with t. cruzi infections.
Feeding, defecation, and development times of Meccus longipennis Usinger, 1939 (Hemiptera: Reduviidae: Triatominae) under laboratory conditions
Martínez-Ibarra, José Alejandro;Grant-Guillén, Yunuen;Martínez-Grant, Diana Monserrat;
Memórias do Instituto Oswaldo Cruz , 2003, DOI: 10.1590/S0074-02762003000700007
Abstract: aspects related to hatching, time-lapse between presenting the blood-meal and beginning of feeding, feeding time, postfeed defecation delay, mortality, and fecundity for each stage of meccus longipennis life-cycle were evaluated. the bugs were maintained in a dark incubator at 27 ± 1oc and 80 ± 5% rh, were fed weekly and checked daily for ecdysis or death. the hatching rate observed for 300 eggs was 76.7% and the average time of hatching was 19.8 days. mean time-lapse between presentation of the blood meal and the beginning of feeding was under 5 min in nymphal stages and postfeed defecation delay was under 10 min in most stages, except in fourth and fifth stages. mean feeding time was longer than 10 min in most stages, except in fourth stage. one hundred thirty-one nymphs (n) (65.5%) completed the cycle and the average time from ni to adult was 192.6 ± 34.8 days. the average span in days for each stage was 18.1 for ni, 21.4 for nii, 29.5 for niii, 45.5 for niv and 55.9 for nv. the number of bloodmeals at each nymphal stage varied from 1 to 5. the mortality rate was 3.29 for ni, 6.8 for nii, 2.92 for niii 3.76 for niv, and 10.16 for nv nymphs. the average number of eggs laid per female in a 9-month period was 615.6. based on our results, we conclude that m. longipennis has some biological and behavioral characteristics which influence its capacity of becoming infected and transmitting trypanosoma cruzi to human populations in those areas of mexico where it is currently present.
Feeding, defecation, and development times of Meccus longipennis Usinger, 1939 (Hemiptera: Reduviidae: Triatominae) under laboratory conditions
Martínez-Ibarra José Alejandro,Grant-Guillén Yunuen,Martínez-Grant Diana Monserrat
Memórias do Instituto Oswaldo Cruz , 2003,
Abstract: Aspects related to hatching, time-lapse between presenting the blood-meal and beginning of feeding, feeding time, postfeed defecation delay, mortality, and fecundity for each stage of Meccus longipennis life-cycle were evaluated. The bugs were maintained in a dark incubator at 27 ± 1oC and 80 ± 5% rh, were fed weekly and checked daily for ecdysis or death. The hatching rate observed for 300 eggs was 76.7% and the average time of hatching was 19.8 days. Mean time-lapse between presentation of the blood meal and the beginning of feeding was under 5 min in nymphal stages and postfeed defecation delay was under 10 min in most stages, except in fourth and fifth stages. Mean feeding time was longer than 10 min in most stages, except in fourth stage. One hundred thirty-one nymphs (N) (65.5%) completed the cycle and the average time from NI to adult was 192.6 ± 34.8 days. The average span in days for each stage was 18.1 for NI, 21.4 for NII, 29.5 for NIII, 45.5 for NIV and 55.9 for NV. The number of bloodmeals at each nymphal stage varied from 1 to 5. The mortality rate was 3.29 for NI, 6.8 for NII, 2.92 for NIII 3.76 for NIV, and 10.16 for NV nymphs. The average number of eggs laid per female in a 9-month period was 615.6. Based on our results, we conclude that M. longipennis has some biological and behavioral characteristics which influence its capacity of becoming infected and transmitting Trypanosoma cruzi to human populations in those areas of Mexico where it is currently present.
Wild Reservoirs Infected by Trypanosoma cruzi in the Ecological Park "El Zapotal", Tuxtla Gutiérrez, Chiapas, México
Solís-Franco René Roque,Romo-Zapata José Adalberto,Martínez-Ibarra José Alejandro
Memórias do Instituto Oswaldo Cruz , 1997,
Abstract:
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.
Vigilancia de la presencia de triatominos mediante gallineros en el sur de Jalisco, México Monitoring triatomid bug (Hemiptera: Reduviidae) presence by sentinel chicken coops in Southern Jalisco State, México
José Alejandro Martínez-Ibarra,Jorge Alejandro Martínez-Grant,Miguel Roberto Verdugo-Cervantes,Rafael Bustos-Salda?a
Biomédica , 2010,
Abstract: Introducción. En México, la enfermedad de Chagas es un problema de salud pública. Se han registrado, al menos, 30 especies de triatominos vectores, la mayoría con hábitos domésticos y tendencia a invadir las viviendas humanas. Objetivo. Evaluar la utilidad de gallineros en la vigilancia de la presencia de triatominos peridomésticos y conocer su situación en el área de estudio. Materiales y métodos. Se realizó un estudio de campo, experimental, longitudinal, por un a o. Se instalaron 50 gallineros en 50 viviendas de tres localidades del municipio de Teocuitatlán de Corona, en el estado de Jalisco, México. Se inspeccionaron los gallineros y las viviendas para saber si aquéllos podían detectar la presencia de triatominos, para estimar la situación vectorial en el área. Resultados. Se recolectaron significativamente (p<0,05) más especímenes de Meccus longipennis (93%) que de Triatoma barberi (7%). Aproximadamente, un tercio (31,3%) de los especímenes de M. longipennis y ninguno de T. barberi se recolectó en los gallineros. M. longipennis tuvo un porcentaje de infección por Trypanosoma cruzi de 25,7%, y T. barberi, de 53,2%. Los meses de primavera y verano fueron en los que se recolectaron más ejemplares de triatominos. Conclusiones. Los gallineros se consideran una herramienta útil para detectar la presencia de ejemplares de M. longipennis, aunque no funcionaron para T. barberi. Se confirma la importancia de M. longipennis y se establece el posible rol primario de T. barberi como vector en el área de estudio. 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
Influence of the blood meal source on the biology of Meccus picturatus Usinger 1939 (Hemiptera: Reduviidae: Triatominae) under laboratory conditions
Martínez-Ibarra, José Alejandro;Novelo López, Mónica;Hernández Robles, María del Rosario;Grant Guillén, Yunuen;
Memórias do Instituto Oswaldo Cruz , 2003, DOI: 10.1590/S0074-02762003000200011
Abstract: aspects related to hatching, time-lapse between presenting the blood meal and beginning of feeding, feeding time, postfeed defecation delay,life time, mortality and fecundity for each stage of meccus picturatus, life-cycle were evaluated and compared in two cohorts of m. picturatus fed on hens or rabbits. the hatching rate observed for each of the two studied groups of eggs was 78.1% (n = 2298) on the group fed on hens and 82.1% (n = 2704) on that fed on rabbits, and the average time of hatching was 20 days. mean time-lapse for beginning feeding was under 3 min in nymphal stages and postfeed defecation delay was under 10 min in all stages, in both cohorts. mean feeding time was significantly (p < 0.05) shorter in triatomines fed on hens than on rabbits. a similar number of nymphs of each cohort, 69 fed on hens (34.5%) and 68 fed on rabbits (34%), completed the cycle. no significantly (p > 0.05) differences were recorded among the average times from ni to adult in the cohort fed on hens (196.8 ± 15.8 days) and the average time in the cohort fed on rabbits (189.5 ± 22.9). the average span in days for each stage fed on hens was not significantly different to the average span for each stage fed on rabbits. the number of blood meals at each nymphal stage varied from 1 to 6 in both cohorts. the mortality rates were higher on fifth nymphal stage, in both cohorts. no significant (p > 0.05) differences were recorded on mortality rates on most nymphal stages of both cohorts. the average number of eggs laid per female from the cohort fed on hens in a 9-month period was 791.1, whereas the average number of eggs in the cohort fed on rabbits was 928.3.
Influence of the blood meal source on the biology of Meccus picturatus Usinger 1939 (Hemiptera: Reduviidae: Triatominae) under laboratory conditions
Martínez-Ibarra José Alejandro,Novelo López Mónica,Hernández Robles María del Rosario,Grant Guillén Yunuen
Memórias do Instituto Oswaldo Cruz , 2003,
Abstract: Aspects related to hatching, time-lapse between presenting the blood meal and beginning of feeding, feeding time, postfeed defecation delay,life time, mortality and fecundity for each stage of Meccus picturatus, life-cycle were evaluated and compared in two cohorts of M. picturatus fed on hens or rabbits. The hatching rate observed for each of the two studied groups of eggs was 78.1% (n = 2298) on the group fed on hens and 82.1% (n = 2704) on that fed on rabbits, and the average time of hatching was 20 days. Mean time-lapse for beginning feeding was under 3 min in nymphal stages and postfeed defecation delay was under 10 min in all stages, in both cohorts. Mean feeding time was significantly (P < 0.05) shorter in triatomines fed on hens than on rabbits. A similar number of nymphs of each cohort, 69 fed on hens (34.5%) and 68 fed on rabbits (34%), completed the cycle. No significantly (P > 0.05) differences were recorded among the average times from NI to adult in the cohort fed on hens (196.8 ± 15.8 days) and the average time in the cohort fed on rabbits (189.5 ± 22.9). The average span in days for each stage fed on hens was not significantly different to the average span for each stage fed on rabbits. The number of blood meals at each nymphal stage varied from 1 to 6 in both cohorts. The mortality rates were higher on fifth nymphal stage, in both cohorts. No significant (P > 0.05) differences were recorded on mortality rates on most nymphal stages of both cohorts. The average number of eggs laid per female from the cohort fed on hens in a 9-month period was 791.1, whereas the average number of eggs in the cohort fed on rabbits was 928.3.
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