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Acceso Abierto Control de langostas en Madagascar: desafío a la capacidad innovadora(1995) Lange, Carlos ErnestoQuizás pocos lugares resulten tan atractivos como Madagascar para biólogos, naturalistas y aventureros. La “isla-continente” o “el mundo aparte”, como ha sido (apropiadamente) apodada, se encuentra en el Océano Indico, separada del Sudeste de África por el canal de Mozambique, de unos 400 km de ancho promedio. Por su superficie (590.000 km2) es la cuarta isla de la tierra, luego de Groenlandia, Nueva Guinea y Borneo. Las estimaciones más recientes indican que Madagascar se habría separado de África hace unos 165 millones de años y desde entonces constituyó, desde un punto de vista biológico, un mundo aislado, un inmenso substrato alternativo para la evolución de animales y plantas. Se puede decir que virtualmente cualquier taxón (especie o grupo de especies de cualquier categoría) malgache considerado, muestra claras evidencias de una evolución aislada del resto de organismos relacionados. La cantidad de taxones endémicos (que son propios del lugar y no se encuentran en otros sitios) malgaches, tanto vivientes como extintos, es asombrosa y no resulta sencillo dar una idea acabada de su magnitud. Así, por citar sólo unos pocos ejemplos, la mayoría de las angiospermas nativas de la isla sólo allí se encuentran y, mientras se conocen seis especies de baobabs (Adansonia) en Madagascar, sólo una ocurre en todo el continente africano. De las 400 especies de anfibios y reptiles de la isla, solamente doce se conocen fuera de ella y más de la mitad de las especies nativas de aves y casi todas las de mamíferos ocurren únicamente en Madagascar. - Artículo
Acceso Abierto Efectos de la calidad del alimento en la tucura Dichroplus pratensist Bruner (Orthoptera: Acrididae)(1996) Pereyra, Patricia; Sánchez, Norma Elba; Wysiecki, María Laura deLos acridios están frecuentemente asociados a plantas que sufren estrés hídrico y térmico, en pastizales con sequías estacionales marcadas. El objetivo de este trabajo fue evaluar el efecto de hojas de maíz, Zea mays, sometidas a marchitamiento artificial, en el comportamiento alimentario, la supervivencia y la fecundidad de Dichroplus praiensis en laboratorio. Se utilizaron hojas turgentes y hojas marchitas para evaluar la preferencia alimentaria, tasas de consumo, crecimiento y eficiencia de conversión de alimento. Se computó la supervivencia diaria, la duración del 5to estadio nínfal, el período de preoviposición y la fecundidad en hembras criadas con ambos tipos de alimentos. Tanto ninfas de 5to estadio como adultos mostraron una marcada preferencia por el alimento marchito. Las ninfas alimentadas con hojas marchitas crecieron y consumieron más que las alimentadas con hojas turgentes. En los adultos, hubo una mayor tendencia al consumo de alimento marchito, sin embargo, no se hallaron diferencias entre alimentos para la tasa de crecimiento relativo. No hubo tampoco diferencias entre tratamientos en la supervivencia, duración del 5to estadio ninfal, período de preoviposición y fecundidad. - Artículo
Acceso Abierto Arañas ponzoñosas(1998) Gonzalez, Alda; Scioscia, Cristina; Gonzalez, Sandra ElizabethLas arañas están ampliamente distribuidas por todo el mundo. Comprenden numerosos géneros y especies repartidos en ciento cinco familias, de las cuales casi el setenta por ciento está representado en la Argentina. Muchas especies revisten importancia sanitaria puesto que, debido a su acción ponzoñosa, pueden causar accidentes, en ocasiones muy graves. Se presenta aquí una reseña de la distribución, morfología, hábitat e incidencia toxicológica, de aquellas que viven en nuestro país y que son capaces de causar daños por picadura. - Artículo
Acceso Abierto Potential of spore-forming bacteria as biocontrol agents of wheat foliar diseases under laboratory and greenhouse conditions(2000) Alippi, Adriana Mónica; Perelló, Analía; Sisterna, Marina Noemí; Greco, Nancy Mabel; Cordo, Cristina AliciaThe potential of Bacillus subtilis, Bacillus cereus, Bacillus licheniformis, Bacillus pumilus, Brevibacillus laterosporus and Paenibacillus polymyxa as biocontrol agents of four foliar necrotrophic pathogens of wheat in Argentina has been evaluated. The following assays were used: (a) effect of the bacterial antagonists on fungal growth in the central disk test with paired cultures, (b) effect of the antagonists on the germination of fungal spores in the paired suspension assay, and (c) reduction of disease severity in greenhouse experiments. The observed effects were specific for the antagonist-pathogen combination investigated. In the paired culture test, most of the bacterial antagonists inhibited the mycelial growth of the four pathogens tested at 14 days of the evaluation. B. licheniformis showed the best results for controlling Septoria tritici and Drechslera tritici-repentis whereas it was the worst against Bipolaris sorokiniana. In the case of Alternaria triticimaculans, the best were B. laterosporus, P. polymyxa and B. licheniformis. Microscopic examination of excised pieces of the fungal colony perimeters showed clear differences among treatments and controls in hyphal morphology (plasmolysis and vacuolation of hyphae, irregular texture in the cytoplasm, formation of chlamydospores). In the central disk test, mycelial necrosis of A. triticimaculans was induced by B. laterosporus, P. polymyxa and B. pumilus. Similar results were obtained with B. sorokiniana in the presence of B. licheniformis and B. subtilis and D. tritici-repentis with B. pumilus. In some combinations, the presence of inhibition haloes or bacterial chemotaxis were observed. In the paired suspension assay, all the bacteria except B. cereus, inhibited the conidial germination of S. tritici. Only P. polymyxa, B. licheniformis and B. laterosporus inhibited the conidial germination of A. triticimaculans, B. laterosporus being the most effective. Although all the bacteria inhibited the conidial germination of B. sorokiniana, the most efficient were B. licheniformis, B. cereus and B. laterosporus. In greenhouse experiments, P. polymyxa and B. cereus were the most efficient to reduce disease severities produced by S. tritici and A. triticimaculans; on the contrary, these bacteria were not effective against B. sorokiniana and D. tritici-repentis. B. laterosporus BLA 170 showed a good behaviour against all the fungal pathogens, particularly for D. tritici-repentis and B. sorokiniana. This is the first report on the efficacy of B. laterosporus against fungal wheat pathogens. - Artículo
Acceso Abierto La amebiasis debilitativa de los ortópteros y su potencial para el control biológico de acridios (Orthoptera: Acridoidea) en la Argentina(Instituto Nacional de Tecnología Agropecuaria (INTA), 2002) Lange, Carlos ErnestoMalameba locustae, el agente etiológico de la amebiasis debilitativa de los ortópteros, es causante de patologías en los tubos de Malpighi y alteraciones en la función excretora que llevan a disminuciones de vigor, longevidad y fecundidad del hospedador afectado. La presente revisión evalúa el potencial de M. locustae para el control microbiano de acridios en nuestro país en base a la información disponible a nivel mundial y a los resultados hasta ahora obtenidos a partir de estudios experimentales sobre acridios argentinos. La facilidad de transmisión por vía oral, la alta infectibidad para varias especies argentinas consideradas perjudiciales (Baeacris punctulatus, Dichroplus elongatus, Dichroplus pratensis, Dichroplus schulzi, Ronderosia bergi, Schistocerca cancellata) y la rara presencia en comunidades naturales de acridios de nuestro país, sugieren que M. locustae podría ser un patógeno adecuado para control mediante la colonización (introducción-establecimiento). - Artículo
Acceso Abierto Parasitosis intestinales en poblaciones Mbyá-Guaraní de la Provincia de Misiones, Argentina: Aspectos epidemiológicos y nutricionales(2006) Orden, Alicia Bibiana; Gamboa, María Inés; Oyhenart, Evelia Edith; Navone, GracielaIntestinal parasite infestation in indigenous Mbyá-Guaraní communities in Misiones, Argentina, was described and associated with nutritional status and environmental and cultural factors. The results were compared with those from Takuapí, a neighboring indigenous population, and the nearest urban population, Aristóbulo del Valle. The Ritchie,Willis, and Kato Katz techniques were used to analyze the stool samples. Anthropometric parameters were analyzed and earth samples processed. From a total sample of 296 individuals analyzed in the four populations, 100 (87.7%), 63 (88.7%), 49 (96.1%), and 50 (82%) were infested in Kaaguy Poty, Yvy Pytá, Takuapí, and Aristóbulo del Valle, respectively. 84% of infested individuals had multiple parasites. The 43% of the individuals presented malnutrition, and 87% of these were infested. There was an association between use of latrines and Giardia lamblia (p < 0.01); open-air defecation, lack of footwear, and hookworms (p < 0.01); and housing type and total helminthes (p < 0.01). Earth samples were contaminated with parasites. The results suggest the relationship between environmental contamination and high prevalence of intestinal parasites in these human populations. - Artículo
Acceso Abierto Estado nutricional y parasitosis intestinales en niños residentes en zonas urbana, periurbana y rural del partido de Brandsen (Buenos Aires, Argentina)(2007) Cesani Rossi, María Florencia; Zonta, María Lorena; Castro, Luis Eduardo; Torres, María Fernanda; Forte, Luis M.; Orden, Alicia Bibiana; Luis, María Antonia; Sicre, María L.; Navone, Graciela; Gamboa, María Inés; Quintero, Fabián Aníbal; Oyhenart, Evelia EdithEl presente estudio tuvo como objeto analizar el estado nutricional y las parasitosis intestinales en niños de 3 a 6 años de edad, residentes en zonas urbanas (U), periurbanas (PU) y rurales (R) del partido de Brandsen. La muestra quedó constituida por 600 niños (302 varones y 298 mujeres). Los valores P85#P95 definieron sobrepeso y >P95 obesidad. Se tomaron muestras de materia fecal seriada y escobillado anal que fueron analizadas mediante técnicas de concentración por sedimentación (Ritchie) y flotación (Willis). Los datos fueron asociados con las características socioambientales de cada zona. PU presentó prevalencias de baja talla para la edad y parasitosis significativamente mayores que U (p<0.01). Se registraron 7 especies parásitas en U, 8 en PU y 4 en R, siendo Enterobius vermicularis, Blastocystis hominis y Giardia lamblia las especies más abundantes. También el poliparasitismo fue mayor en PU. Aunque el sobrepeso y la obesidad fueron elevados en las tres zonas, las mayores prevalencias se registraron en PU y R respecto de U (p<0.01). La coexistencia de desnutrición y sobrepeso-obesidad, podría vincularse con los cambios experimentados en las costumbres alimentarias y los modos de vida de estas poblaciones en el contexto de la transición nutricional. La zona periurbana presenta las peores condiciones socio-ambientales para el crecimiento y la salud de los niños en edad preescolar. - Comunicacion
Acceso Abierto Parasitosis intestinales y factores ambientales en una población rural de Argentina, 2002-2003(2007) De Luca, María Marta; Ciarmela, María Laura; Pezzani, Betina Cecilia; Grenovero, M. S.; Minvielle, Marta Cecilia; Basualdo Farjat, Juan A.; Cordoba, María AlejandraWe evaluate the prevalence of intestinal parasites in 504 people and the degree of association between environmental variables and parasites found in population, soil and water in a rural area of Argentina during 2002-2003. A structured survey was used to evaluate the environmental variables and fecal-human, soil and water samples were analyzed. The prevalence of parasites was 45.4%. Most prevalent protozoa were Blastocystis hominis (27.2%) and Giardia lamblia (6.9%), while the most prevalent helminth was Ascaris lumbricoides (3.8%). The analyzed environmental variables showing association (p < 0.05) with presence of parasites in population were: cardboard-tin or wooden house, dirt floor, home or communal water pump, faucet outside the house or public faucet and cesspool or latrine. Parasite forms were found in 82.3% of the soil samples and in 84.2% of the water samples. In both samples we found parasites that were also found in people. In this study we have found deficient sanitary conditions associated with presence of parasites in population and we have evidenced that contaminated soil and water were the source of these parasites. - Comunicacion
Acceso Abierto Longevity and fecundity of Dichroplus maculipennis (Orthoptera, Acrididae) at non-outbreaking and outbreaking situations(2011) Mariottini, Yanina; De Wysiecki, Laura; Lange, Carlos ErnestoLongevity and fecundity of Dichroplus maculipennis (Orthoptera, Acrididae) at non-outbreaking and outbreaking situations. Dichroplus maculipennis is one of the most characteristic and damaging grasshopper species of Argentina, mainly in areas of the Pampas and Patagonia regions. We estimated and compared the longevity and fecundity of adult female D. maculipennis under controlled conditions (30°C, 14L:10D, 40% RH) from individuals collected as last instar nymphs (VI) in the field and with a known recent history of low and high density conditions. Densities of D. maculipennis at the collecting sites were 0.95 individuals per m2 in 2006 and 46 ind/m2 in 2009, representing non-outbreaking and outbreaking situations, respectively. Adult female longevity in 2006 (67.96 ± 3.2 days) was significantly higher (p < 0.05) than in 2009 (37.44 ± 1.98 days). The number of egg-pods per female was 3.32 ± 0.44 for 2006 and 1.62 ± 0.26 for 2009. The average fecundity in 2006 (89.29 ± 11.9 eggs/female) was significantly greater (p < 0.05) than that in 2009 (36.27 ± 5.82 eggs/female). While it was observed that the oviposition rate was higher in 2006, this difference was not significant (p > 0.05). The fecundity curves showed that the highest values were at weeks 11 and 13 for the 2006 females, and at week 6 for those of 2009. Since the daily oviposition rate at low and high densities was not significantly different, the diminished fecundity rate at high density is attributable to their reduced longevity - Artículo
Embargado Population dynamics between the mermithid Strelkovimermis spiculatus (Nematoda: Mermithidae) and the floodwater mosquito Ochlerotatus albifasciatus (Diptera: Culicidae) over time(Elsevier, 2012) María V. Micieli, Paula Risso, María F. Achinelly , M. de los Milagros Villar, Evangelina Muttis; Micieli, María Victoria; Risso, Paula; Achinelly, María Fernanda; Villar, María de los Milagros; Muttis, EvangelinaWe investigated the population dynamics of Strelkovimermis spiculatus in Ochlerotatus albifasciatus to determine the abiotic and biotic parameters involved in this host-parasite system. Weekly samplings performed from May 2007 through May 2010 in three ponds located in open areas of La Plata, Argentina revealed that parasitism by S. spiculatus in O. albifasciatus occurred throughout all seasons with differences in effectiveness among breeding habitats: A mosquito-larva reduction of 80.7% was observed in a habitat where 100% of the generations were infected by nematodes; an intermediate situation (a 41.9% reduction) involved a lower percentage of parasitism above 50% although nematode infection was likewise registered in 92.9% of the generations. Finally, a mosquito-larva reduction of 2.68% was recorded where only 46.0% of the generations were parasitized and at levels of nematode infection below 50%. We analyzed the effects of abiotic and biotic parameters on S. spiculatus infections. The floodedsurface area was the only variable significantly associated with percent infection. Infection prevalence correlated positively with the mean number of emerged nematodes per larva and with the S. spiculatus male-to-female ratio in each parasitized-mosquito generation. In conclusion, the frequency over time and levels of infection are key parameters in the regulation of mosquito populations by this mermithid - Artículo
Acceso Abierto First record of a mosquito iridescent virus in Culex pipiens L. (Diptera: Culicidae)(International Union of Microbiological Societies, 2012) Muttis, Evangelina; Miele, Solange A. B.; Belaich, Mariano N.; Micieli, María Victoria; Becnel, James J.; Ghiringhelli, Pablo D.; García, Juan JoséThe mosquito iridescent viruses (MIVs) are large icosahedral DNA viruses that replicate and assemble in the cytoplasm of the host. Paracrystalline arrangements of virions that accumulate in the cytoplasm produce an iridescent color that is symptomatic of acute infections. In August 2010 we found larvae of Culex pipiens with these symptoms in suburban ditches around La Plata city, Argentina. Electron microscope studies, PCR amplification of the Protein (MCP) gene arrangement, DNA sequencing and phylogenetic analysis were carried out. - Artículo
Acceso Abierto Vector Competence of Argentine Mosquitoes (Diptera: Culicidae) for West Nile virus (Flaviviridae: Flavivirus)(Entomological Society of America, 2013) Micieli, María Victoria; Matacchiero, Amy C.; Muttis, Evangelina; Fonseca, Dina M.; Aliota, Matthew T.; Kramer, Laura D.We examined the ability of Culex pipiens L. complex mosquitoes from Argentina to vector West Nile virus (WNV) to assess their role in the transmission of WNV in South America. Several egg rafts of Culex spp. were collected from different breeding sites in the suburbs of the city of La Plata, Argentina, and a subset of each progeny was scored with morphological and genetic species indicators. Surprisingly, we did not find Cx. pipiens form pipiens, but found evidence of genetic hybrids of Culex quinquefasciatus and Cx. pipiens f. molestus. We then used morphological traits to create two colonies predominantly composed of one of these two taxa, although some hybrids are likely to have been included in both. These colonies were used in vector competence studies using NY99 and WN02 genotype strains of WNV obtained in New York State. As controls, we also tested colonies of U.S. Cx. quinquefasciatus and Cx. pipiens f. molestus. Additional Culex larvae from three drainage ditches near the cities of La Plata and Berisso, Argentina, were identified by morphological and high-resolution molecular markers (microsatellites) as Cx. quinquefasciatus Say, Cx. pipiens form molestus, and hybrids. Results indicate that Argentinian Culex are competent but only moderately efficient vectors of WNV and are less susceptible to this virus than comparable U.S. mosquito strains. Studies of vertical transmission of NY99 virus by Cx. pipiens f. molestus hybrids from Argentina yielded a minimal filial infection rate of 1.19 from females feeding during their second and later bloodmeals. - Artículo
Embargado Culex pipiens affected by joint infection of a mosquito iridescent virus and Strelkovimermis spiculatus(Elsevier, 2013) Muttis, Evangelina; Micieli, María Victoria; García, Juan JoséDual infections with a mosquito iridescent virus (MIV) and the mermithid nematode, Strelkovimermis spiculatus were recorded in natural Culex pipiens populations around La Plata city, Argentina. S. spiculatus was detected in 82% of samples that were positive for MIV infection. Dissected larvae of Cx. pipiens with patent MIV infection presented 42% infection with S. spiculatus. Larvae of Cx. pipiens exposed to MIV and S. spiculatus under laboratory conditions produced a high joint infection rate (82.5%) while no infection was recorded on larvae exposed to virus suspension only. Field and laboratory results suggest a strong association between S. spiculatus and MIV in natural populations of Cx. pipiens, in which S. spiculatus could be a mode of entry for the virus into the mosquito hemocele. - Artículo
Acceso Abierto Caracterización del estado nutricional, enteroparasitosis y condiciones socio-ambientales de la población infanto-juvenil del partido de La Plata(2013) Garraza, Mariela; Bergel, María L.; Torres, María Fernanda; Castro, Luis Eduardo; Luis, María Antonia; Forte, Luis M.; Zonta, María Lorena; Cesani Rossi, María Florencia; Luna, Maria E.; Navone, Graciela; Gamboa, María Inés; Oyhenart, Evelia Edith; Quintero, Fabián AníbalIn the present work, the nutritional status, intestinal parasitosis and socio-environmental conditions of children from the city centre and 11 localities of La Plata Department were characterized through a transversal study. Body weight and height were measured in 6,397 children aged 4.0 to 13.9 years old. Body mass index was calculated and the nutritional status estimated using NHANES III. A structured questionnaire was made to evaluate socio-environmental characteristics. Parasitological analyses were carried out in 729 children using fecal samples and implementing the Ritchie technique and anal brushes. The overall results indicated 22.1% of weight excess, 8.7% of undernutrition and 68.5% of parasitosis, being more prevalent Enterobius vermicularis (38.7%), Blastocystis hominis (36.1%), Giardia lamblia (19.1%), and commensal protozoa (26,1%). The worm burden showed a lower value (9.3%). La Plata Department presented great heterogeneity in the nutritional status and parasitic infection of children because they depend on the socio-environmental characteristics. Poor living conditions, low educational levels and lack of formal jobs would explain the co-occurrence of infant parasitic infection and undernutrition, being chronic the most prevalent type of undernutrition. On the other hand, the localities in which parents had a higher educational level and a formalized job -though less access to basic urban services- showed a greater prevalence of overweight. - Artículo
Acceso Abierto A new species of Dasyhelea from Brazilian Amazonas and the description of the male of D. paulistana (Diptera: Ceratopogonidae)(2014) Díaz, María Florentina; Torreias, Sharlene Roberta da Silva; Spinelli, Gustavo Ricardo; Ronderos, María M.A new species, Dasyhelea pseudopollinosa Díaz & Ronderos sp. nov., is described from Brazil, illustrated and photographed as pupae and male and female adults. The male of D. paulistana Forattini & Rabello, 1957 is described for the first time, and the pupa and female adult are redescribed. Pupae of both species were collected from mats of floating fern leaves (Salviniaceae and Azollaceae) in Brazil and Argentina, and exhibit a respiratory organ which is thick at the base and tapering to a sharp apex, and segment 9 with elongate, slender apicolateral process. Diffe rences between the two species are established, and they are also compared with Nearctic congeners that have the same kind of pupa: D. pollinosa Wirth, 1952, D. traverae Thomsen, 1935, and D. chani Wirth & Linley, 1990. - Artículo
Acceso Abierto Biodiversity of entomonematodes parasitizing soil pest white grubs (Scarabaeidae) of Buenos Aires, Argentina(2014) Camino, Nora Beatriz; Achinelly, María Fernanda; Rusconi, José Matías; Eliceche, Daiana; Salas, AugustoThis work was carried out between 2006-2010 in wheat fields of the Pampas, Argentina, in order to determine species of nematode parasites and pathogens of white grubs, soil major pest. Samples were taken with shovel in randomly selected sites. Nymphs of Diloboderus abderus and Cyclocephalla signaticollis (Scarabaeidae) were collected. Thirteen species of nematodes belonging to 5 families (Mermithidae, Thelastomatidae, Travassonematidae, Diplogasteridae and Rhabditidae) were determined. The richness species values were 1 for Cyclocephalla signaticollis and 12 for Diloboderus abderus. The thelastomatids and rhabdítids were the largest group of nematodes, with a total of 3 species each. The thelastomátids were very prevalent with infections exceeded 60%, followed by diplogasterids which reached 36%. The mermítids were less prevalent with values close to 10%. The family Travossonematidae was the one with the lowest abundance (0.32). Knowledge of nematode community will be a great ability to interpret host-parasite relationships and in many cases determine those species pest potential bioreguladoras important agents in agricultural areas of Argentina. This study provides for the first time to the Pampas region of our country a list of white worms parasitic nematodes. - Artículo
Acceso Abierto Ocurrencia natural de hongos entomopatógenos en suelos cultivados con yerba mate (Ilex paraguariensis St. Hil.) en Misiones, Argentina(Asociación Argentina de Microbiología, 2015) Schapovaloff, María Elena; Angeli Alves, Luis F.; Urrutia, María Inés; López Lastra, ClaudiaEste trabajo tuvo por objetivo aislar, identificar y caracterizar morfológicamente hongos entomopatógenos presentes en suelos cultivados con yerba mate (Ilex paraguariensis St. Hil.). Se realizó una prospección de hongos entomopatógenos nativos a partir de 40 muestras de suelos cultivados con yerba mate ubicados en la provincia de Misiones, República Argentina, desde mayo de 2008 hasta junio de 2010. Las muestras de suelo se obtuvieron en cercanías de plantas de yerba mate, se aplicó la técnica de dilución seriada en medios de cultivos selectivos. Después de obtenidos los cultivos puros, los hongos fueron caracterizados macroscópica y microscópicamente, y se los identificó mediante el uso de claves taxonómicas específicas. Se aislaron 29 cepas fúngicas pertenecientes a las especies Beauveria bassiana (n = 17), Metarhizium anisopliae (n = 2) y Purpureocillium lilacinum (n = 10). - Artículo
Embargado Transmission of a pathogenic virus (Iridoviridae) of Culex pipiens larvae mediated by the mermithid Strelkovimermis spiculatus (Nematoda)(Elsevier, 2015) Muttis, Evangelina; Micieli, María Victoria; Urrutia, María Inés; García, Juan JoséLittle progress been made in elucidating the transmission pathway of the invertebrate iridescent virus (MIV). It has been proposed that the MIV has no active means to enter the mosquito larva. We have previously found that the presence of the mermithid nematode Strelkovimermis spiculatus is associated with MIV infection in Culex pipiens under field conditions. In the present study, we evaluated the transmission of MIV to C. pipiens larvae mediated by S. spiculatus and several factors involved in this pathway (mosquito instars, nematode:mosquito larva ratio, amount of viral inoculum). Our results indicate that S. spiculatus functions as an MIV vector to C. pipiens larvae and seems to be an important pathway of virus entry into this system. Moreover, TEM images of S. spiculatus exposed to the viral suspension showed no infections inside the nematode but showed that viral particles are carried over the cuticle of this mermithid. This explains the correspondence between MIV infection and the factors that affect the parasitism of S. spiculatus in C. pipiens larvae. - Documento de conferencia
Acceso Abierto Revisión de microscopios virtuales: en busca de características que favorezcan el trabajo colaborativo(2015) Martorelli, Sabrina; Martorelli, Sergio; Sanz, Cecilia; Pesado, Patricia MabelSe presenta en este artículo un análisis de un conjunto de microscopios virtuales que se encuentran actualmente disponibles y que son utilizados en el ámbito educativo y académico. Se realiza una comparación de las diferentes características que los mismos ofrecen, con especial énfasis en aquellas características que se encuentren relacionadas con el trabajo colaborativo. Los microscopios virtuales han empezado a revolucionar la enseñanza y la investigación en disciplinas donde el uso de microscopios es esencial, la posibilidad de contar con características para la colaboración resulta un aspecto de interés y constituye un aporte en pos de acompañar procesos de trabajo y aprendizaje colaborativo. Para poder llevar adelante el análisis de los microscopios virtuales, se han definido criterios específicos los cuales han sido fundamentales también durante el proceso de recopilación bibliográfica.\nEste análisis constituye un aporte para los docentes e investigadores que trabajan cotidianamente con este tipo de herramientas. Se presentan los primeros resultados de este estudio, y las conclusiones a las que se arriban. - Documento de conferencia
Acceso Abierto HistoTV: primeros pasos hacia una aplicación educativa para TVDi sobre histología animal(2015) Martorelli, Sabrina; Martorelli, Sergio; Sanz, Cecilia; Abásolo, María José; Pesado, Patricia MabelLa TV digital interactiva se presenta como una alternativa para complementar procesos educativos, facilitando además el acceso a áreas geográficas que no tienen otras posibilidades. En este artículo se presenta un prototipo de una aplicación educativa (HistoTV) que como objetivo general propone una estrategia alternativa para abordar las necesidades de un contexto educativo específico, vinculado a la temática de Histología Animal. La aplicación que aquí se presenta constituye una pieza más del conjunto de recursos y materiales educativos digitales destinados a la enseñanza y aprendizaje de la Biología y la Parasitología Animal, que se han venido construyendo en los últimos años. Se orienta a ofrecer un espacio adicional para la observación de preparados microscópicos de tejidos animales de manera tal de ayudar a los alumnos en la identificación de estos tejidos, a partir de las observación de diferentes muestras. Se espera con esta aplicación extender las prácticas realizadas tradicionalmente en el laboratorio, y contribuir en el aprendizaje de los alumnos en la identificación de tejidos animales.