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Search Results: 1 - 10 of 13125 matches for " Mauro Omar Vences Blanco "
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Triatoma mexicana Herrich-Schaeffer (Hemiptera: Reduviidae: Triatominae) Descripción de la Genitalia Externa del Macho y Morfología Externa de la Hembra Triatoma mexicana Herrich-Schaeffer (Hemiptera: Reduviidae: Triatominae) Description of the External Male Genitalia and External Morphology of the Female
Paz María Salazar Schettino,Gloria Elena Rojas Wastavino,José Santiago Rosales Pi?a,Mauro Omar Vences Blanco
EntomoBrasilis , 2013, DOI: 10.12741/ebrasilis.v6i1.275
Abstract: Triatoma mexicana fue descrita originalmente en 1848 por Herrich-Schaeffer nombrándola Conorhinus mexicanus Herrich-Schaeffer. Actualmente se registra su hallazgo en los estados de Guanajuato, Hidalgo Querétaro y San Luis Potosí. Los estudios sobre su distribución espacial, índices entomológicos, presencia en el intradomicilio y peridomicilio, biología y riesgo de transmisión de Trypanosoma cruzi Chagas demuestran que es una especie importante desde el punto de vista de salud pública. Con el propósito de ampliar el conocimiento biológico sobre la especie, en el presente estudio se hace la descripción de la hembra así como la genitalia externa del macho, en ejemplares capturados en el estado de Guanajuato. Triatoma mexicana was originally described in 1848 by Herrich-Schaeffer, naming Conorhinus mexicanus Herrich-Schaeffer. Its finding is currently registered in the States of Guanajuato, Hidalgo, Querétaro, and San Luis Potosí. Studies about the spatial distribution, the entomological indices, it presence indoor an outdoor in houses, it biology and risk of transmission of Trypanosoma cruzi Chagas show that it is an important species from the point of view of public health. With the purpose of extending the biological knowledge of this species, the present study is the description of the female as well as the external male genitalia, in specimens captured in the State of Guanajuato.
Triatoma mexicana (Hemiptera: Reduviidae) in Guanajuato, Mexico: house infestation and seasonal variation
Salazar Schettino, Paz María;Rosales Pi?a, José Santiago;Rojas Wastavino, Gloria;Cabrera Bravo, Margarita;Vences Blanco, Mauro;López Cárdenas, Jorge;
Memórias do Instituto Oswaldo Cruz , 2007, DOI: 10.1590/S0074-02762007005000118
Abstract: triatoma mexicana was described by herrich-schaeffer in 1848. in 1940, a male specimen was found in hidalgo. in 1970, this species was recorded in the state of queretaro. later, it was registered in guanajuato and san luis potosi. in the present paper we performed an investigation in 545 dwellings from three counties in the state of guanajuato, mexico, from march 2003 to may 2004. the search and capture of triatomines were seasonally performed indoors and outdoors. entomological indexes were calculated. the risk and no risk relations between triatomine presence and housing construction materials were analyzed. fourteen triatomines were collected indoors and 151 outdoors. the vectors were collected in houses built with either risky and non-risky materials. adults go indoors but do not settle there, hence, no relationship was found between the building materials and infestation of houses. conventional interventions like house improvement or insecticide spraying are not efficient for the control of t. mexicana, because its developmental cycle is accomplished outdoors in the area surrounding the houses.
Insecticide and community interventions to control Triatoma dimidiata in localities of the State of Veracruz, Mexico
Wastavino, Gloria Rojas;Cabrera-Bravo, Margarita;García De La Torre, Guadalupe;Vences-Blanco, Mauro;Ruiz Hernández, Adela;Bucio Torres, Martha;Guevara Gómez, Yolanda;Mesa, Alejandro;Salazar Schettino, Paz María;
Memórias do Instituto Oswaldo Cruz , 2004, DOI: 10.1590/S0074-02762004000400015
Abstract: three different interventions to control triatoma dimidiata in the state of veracruz were implemented: x-1 = whole dwelling spraying, x-2 = middle wall spraying, x-3 = household cleaning. cyfluthrin was sprayed 3 times with 8 month intervals. after each spraying, insects were collected and sent to the laboratory to be recorded and to determine genus and species of the adult triatomine bugs, and nymphs were counted. trypanosoma cruzi presence was determined. with x-1, the infestation, colonization, and natural infection indexes were reduced to 0% in the 3 localities, with respect to t0. with x-2, the infestation index was reduced to 10% at t3 in 3 localities; the colonization index was reduced to 0% in only 1 locality at t3, and the natural infection index was reduced to 0% at t3. with x-3 the 3 indexes were not effectively reduced but they decreased with respect to the baseline study. insecticide application to the whole dwelling is a more efficient intervention than its application to only the lower half of the walls and to the cleaning of houses.
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.
Occurrence of hybrids and laboratory evidence of fertility among three species of the Phyllosoma complex (Hemiptera: Reduviidae) in Mexico
Martínez-Ibarra, José Alejandro;Salazar-Schettino, Paz María;Nogueda-Torres, Benjamín;Vences, Mauro Omar;Tapia-González, José María;Espinoza-Gutiérrez, Bertha;
Memórias do Instituto Oswaldo Cruz , 2009, DOI: 10.1590/S0074-02762009000800009
Abstract: in seven studied communities of western mexico, triatomine specimens were sympatrically collected, some with atypical morphological characteristics in contrast to pure specimens, which were presumed to be hybrids. more than 200 specimens of meccus pallidipennis and meccus longipennis with brown-yellow markings on dorsal connexival segments were collected in ahuacapán and quitupan. in la mesa, more than 60 specimens similar to meccus picturatus in most morphological characteristics (including size) were collected, although they presented a largely yellowish corium like m. pallidipennis. interfertility was proven between all of the studied wild hybrid specimens, as well as between all the experimental laboratory hybrids. two different phenotypes (m. picturatus and m. longipennis) were obtained from crosses between m. picturatus x m. picturatus and m. longipennis x m. longipennis from the three studied localities in state of nayarit as from la mesita. results support the hypothesis that the subspecific ranking of those triatomines may, therefore, be more appropriate because reproductive isolation has not been developed and complete interbreeding was recorded.
Reversal to air-driven sound production revealed by a molecular phylogeny of tongueless frogs, family Pipidae
Iker Irisarri, Miguel Vences, Diego San Mauro, Frank Glaw, Rafael Zardoya
BMC Evolutionary Biology , 2011, DOI: 10.1186/1471-2148-11-114
Abstract: Here, we performed behavioral observations in the poorly known African pipid genus Pseudhymenochirus and document that the sound production in this aquatic frog is almost certainly air-driven. However, morphological comparisons revealed an indisputable pipid nature of Pseudhymenochirus larynx. To place this paradoxical pattern into an evolutionary framework, we reconstructed robust molecular phylogenies of pipids based on complete mitochondrial genomes and nine nuclear protein-coding genes that coincided in placing Pseudhymenochirus nested among other pipids.We conclude that although Pseudhymenochirus probably has evolved a reversal to the ancestral non-pipid condition of air-driven sound production, the mechanism through which it occurs is an evolutionary innovation based on the derived larynx of pipids. This strengthens the idea that evolutionary solutions to functional problems often emerge based on previous structures, and for this reason, innovations largely depend on possibilities and constraints predefined by the particular history of each lineage.As noticed by Darwin [1], every derived feature in an organism must have evolved from a pre-existing feature in its ancestors. Therefore, the current form and function of organism attributes are determined, to a great extent, by phyletic heritage of past events [2]. This equally applies to evolutionary key innovations, which are not designed every time anew, but use available materials, that are themselves a product of millions of years of evolution. This has been firmly established by many studies showing that (i) novel morphological structures may often appear by deploying ancient genetic regulatory circuits [e.g. [3]] and (ii) existing genes or morphological structures can be recruited to perform completely new functions [e.g. [4,5]] or to explore new approaches to carry out the same task [6]. Evolution is an integrated and unitary process [7], and effective reuse of previous molecular or morphological structures
Giant Calcified Renal Artery Aneurysm: Traditional RX versus Three-Dimensional Computed Tomography  [PDF]
Mauro Gacci, Omar Saleh, Annalisa Mantella, Leonidas Azas, Paola Romagnani, Andrea Minervini, Sergio Serni, Marco Carini
Advances in Computed Tomography (ACT) , 2013, DOI: 10.4236/act.2013.21004
Abstract: A 65-year-old woman with no history of previous flank trauma, renal stone or upper urinary tract infections, presented for flank pain and left hydro-uretero-nephrosis seven days after hysterectomy. Percutaneous pielography revealed narowing of the distal ureter, without endoureteral mass. The plain abdomen film incidentally showed a 3-cm calcified ring on the left renal shadow, who resulted external to the collecting system at pielography. A 3-dimensional-CT scan with angiographic reconstruction revealed a 3-cm calcified renal artery aneurysm. The vascular surgeon suggested a watchful waiting. The patient underwent ureteral reimplantation with ureteral stenting, allowing a complete recovery of iatrogenic stenosis two months postoperatively.
Attributes related to seasonal herbage growth in white clover
Scheneiter, Omar;Rosso, Beatriz;Corletto, Mauro;
Scientia Agricola , 2009, DOI: 10.1590/S0103-90162009000100003
Abstract: when breeding temperate forage species is investigated, some attributes such as herbage accumulation and seasonal growth patterns have to be considered. to modify some of these traits, knowledge of the detailed process might be useful. in order to evaluate seasonal growth of contrasting white clover populations an experiment was carried out. treatments were five cultivars and three local populations collected in argentina. weekly measures were taken during each season to calculate leaf appearance and flower appearance rates, stolon growing rate and dry matter (dm) net accumulation. different germplasm of this species have different mechanisms for dm accumulation. leaf size, more than leaf appearance rate, was the variable with most differences among germplasm and mostly related to dry matter accumulation. during spring and summer, inflorescences production had important effects on growing stolon rate, and differences among germplasm were evident. some local populations showed favourable attributes that could be useful for breeding.
El Ministerio de Fomento, impulsor del estudio y el reconocimiento del territorio mexicano (1877-1898)
Blanco Martínez, Mireya;Moncada Maya, José Omar;
Investigaciones geográficas , 2011,
Abstract: the object of this article is to announce a series of reflections about the role that the ministerio de fomento played concerning the study and recognition of the mexican territory in the second half of the 19th century. this will be sustained in the analysis of the reports contained in one of the publications of the ministerio de fomento: anales del ministerio de fomento de la república mexicana, corresponding the period delimited for this research with that of the publication of annals.
El problema de Cauchy asociado a una ecuación del tipo Kuramoto-Sivashinsky bidimensional periódica
Revista Colombiana de Matemáticas , 2011,
Abstract: in this work, we deal with the local and global wellposedness in the sobolev spaces hs(t2) for s≥1 of the cauchy problem associated to a bidimensional kuramoto-sivashinsky type equation, which models physical phenomena that occurs in thin films.
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