7 results on '"G. Calderón Fernández"'
Search Results
2. Cuticular Hydrocarbon Variability Among Triatoma dimidiata (Hemiptera: Reduviidae) Populations from Mexico and Guatemala
- Author
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Marino Cabrera, M. C. Monroy, R. Ordoñez, Justin Ramsey, P.M Salazar Schettino, G. Calderón Fernández, and M. P. Juárez
- Subjects
geography ,education.field_of_study ,geography.geographical_feature_category ,General Veterinary ,biology ,Ecology ,Population ,Heteroptera ,biology.organism_classification ,Hemiptera ,Infectious Diseases ,Cave ,Reduviidae ,Insect Science ,Triatoma ,parasitic diseases ,Parasitology ,Triatoma dimidiata ,education ,Triatominae - Abstract
The geographic variation in the cuticular hydrocarbon pattern among 11 populations of Triatoma dimidiata Latreille (Hemiptera: Reduviidae: Triatominae) from different regions of Mexico and Guatemala, was studied using capillary gas chromatography. T. dimidiata populations were differentiated based on the relative amounts of 71 hydrocarbon components. Insect population classification was mostly in agreement with their geographical vicinity; Mexican populations from the Yucatan peninsula grouped together with those from northern Guatemala, insects from the Mexican Gulf coast states were closely related to those collected from northern Oaxaca, and to a lesser extent, to insects from Chiapas. Insects from southern Oaxaca were clustered together with those from southern Guatemala. All these populations were clearly separated from Guatemalan specimens collected in caves from Alta Verapaz.
- Published
- 2005
3. [Untitled]
- Author
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Rosana Crespo, G. M. Dal Bello, Susana Beatriz Padín, Nicolás Pedrini, M.P. Júrez, and G. Calderón Fernández
- Subjects
Alkane ,chemistry.chemical_classification ,biology ,ved/biology ,ved/biology.organism_classification_rank.species ,Beauveria bassiana ,Acanthoscelides obtectus ,Hyphomycetes ,biology.organism_classification ,Conidium ,Palmitic acid ,chemistry.chemical_compound ,chemistry ,Animal ecology ,Insect Science ,Botany ,Gas chromatography ,Food science ,Agronomy and Crop Science - Abstract
The effect of alkane-growth induction of theentomopathogenic fungus Beauveria bassiana(Balsamo) Vuillemin (Deuteromycotina:Hyphomycetes), on the ability to kill the beanweevil Acanthoscelides obtectus Say(Coleoptera: Bruchidae), was tested. Adultinsects were sprayed with an 0.01% Tween 20aqueous suspension of 4 × 106 conidia/ml.The performance of fungi grown in complete agarmedium containing glucose as carbon source(FS0) was compared to that of alkane-grownfungi (FS1) with n-hexadecane as the onlycarbon source. Mortality increased (p< 0.05) from 22 ± 4.5% to 44 ±11.4% at day 7, and from 26 ± 5.5% to 60± 7.1% 14 days after treatment withFS0 or FS1 respectively. The insectepicuticular hydrocarbons were analysed bycapillary gas chromatography (CGC); majorcomponents were saturated hydrocarbons, 27 to29 carbons in length. A variety ofmethyl-branched isomers of C27 were theprevailing structures, and nC27 was the majorstraight chain component. Whole insecthydrocarbons were qualitatively identical tothose of the epicuticular surface. Oleic,linoleic and palmitic acids accounted foralmost 88% of the fungal fatty acids,irrespective of the carbon source used forgrowth; however, the unsaturated/saturatedratio diminished markedly from 4.32(FS0) to 2.47 (FS1). These resultsindicate that alkane supplementation of culturemedia might be a tool to improve the virulenceof some mycoinsecticides.
- Published
- 2002
4. Cuticular hydrocarbon variability among Triatoma dimidiata (Hemiptera: Reduviidae) populations from Mexico and Guatemala
- Author
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G, Calderón Fernández, M P, Juárez, J, Ramsey, P M, Salazar Schettino, M C, Monroy, R, Ordoñez, and M, Cabrera
- Subjects
Chromatography, Gas ,Geography ,Animals ,Cluster Analysis ,Discriminant Analysis ,Triatoma ,Guatemala ,Mexico ,Hydrocarbons ,Insect Vectors - Abstract
The geographic variation in the cuticular hydrocarbon pattern among 11 populations of Triatoma dimidiata Latreille (Hemiptera: Reduviidae: Triatominae) from different regions of Mexico and Guatemala, was studied using capillary gas chromatography. T. dimidiata populations were differentiated based on the relative amounts of 71 hydrocarbon components. Insect population classification was mostly in agreement with their geographical vicinity; Mexican populations from the Yucatan peninsula grouped together with those from northern Guatemala, insects from the Mexican Gulf coast states were closely related to those collected from northern Oaxaca, and to a lesser extent, to insects from Chiapas. Insects from southern Oaxaca were clustered together with those from southern Guatemala. All these populations were clearly separated from Guatemalan specimens collected in caves from Alta Verapaz.
- Published
- 2005
5. Intraspecific variability in Triatoma dimidiata (Hemiptera: Reduviidae) populations from Guatemala based on chemical and morphometric analyses
- Author
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Sergio Javier Mijailovsky, Marianela Menes, M. P. Juárez, Dulce Maria Bustamante, M. C. Monroy, and G. Calderón Fernández
- Subjects
Male ,Chromatography, Gas ,Intraspecific competition ,Species Specificity ,parasitic diseases ,Animals ,Chagas Disease ,Triatoma dimidiata ,Reduviidae ,Triatominae ,General Veterinary ,biology ,Ecology ,fungi ,Heteroptera ,biology.organism_classification ,Guatemala ,Hemiptera ,humanities ,Hydrocarbons ,Insect Vectors ,Infectious Diseases ,Insect Science ,Triatoma ,Parasitology ,Ordination ,Female - Abstract
The intraspecific variability of Triatoma dimidiata Latreille, a major vector of Chagas disease, was studied in four departments of Guatemala. Insects were collected from either domestic and sylvatic habitats, and their cuticular hydrocarbon pattern and head morphology were analyzed using ordination and classification techniques. A significant discrimination was obtained both with morphometric and hydrocarbon analyses. Insects from northern departments were easily differentiated from southern conspecifics. Distinctive hydrocarbon pattern and head shape were detected for insects collected from caves in the north central region of the country, posing concern about their taxonomic status.
- Published
- 2005
6. Genome of Rhodnius prolixus, an insect vector of Chagas disease, reveals unique adaptations to hematophagy and parasite infection.
- Author
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Mesquita RD, Vionette-Amaral RJ, Lowenberger C, Rivera-Pomar R, Monteiro FA, Minx P, Spieth J, Carvalho AB, Panzera F, Lawson D, Torres AQ, Ribeiro JM, Sorgine MH, Waterhouse RM, Montague MJ, Abad-Franch F, Alves-Bezerra M, Amaral LR, Araujo HM, Araujo RN, Aravind L, Atella GC, Azambuja P, Berni M, Bittencourt-Cunha PR, Braz GR, Calderón-Fernández G, Carareto CM, Christensen MB, Costa IR, Costa SG, Dansa M, Daumas-Filho CR, De-Paula IF, Dias FA, Dimopoulos G, Emrich SJ, Esponda-Behrens N, Fampa P, Fernandez-Medina RD, da Fonseca RN, Fontenele M, Fronick C, Fulton LA, Gandara AC, Garcia ES, Genta FA, Giraldo-Calderón GI, Gomes B, Gondim KC, Granzotto A, Guarneri AA, Guigó R, Harry M, Hughes DS, Jablonka W, Jacquin-Joly E, Juárez MP, Koerich LB, Lange AB, Latorre-Estivalis JM, Lavore A, Lawrence GG, Lazoski C, Lazzari CR, Lopes RR, Lorenzo MG, Lugon MD, Majerowicz D, Marcet PL, Mariotti M, Masuda H, Megy K, Melo AC, Missirlis F, Mota T, Noriega FG, Nouzova M, Nunes RD, Oliveira RL, Oliveira-Silveira G, Ons S, Orchard I, Pagola L, Paiva-Silva GO, Pascual A, Pavan MG, Pedrini N, Peixoto AA, Pereira MH, Pike A, Polycarpo C, Prosdocimi F, Ribeiro-Rodrigues R, Robertson HM, Salerno AP, Salmon D, Santesmasses D, Schama R, Seabra-Junior ES, Silva-Cardoso L, Silva-Neto MA, Souza-Gomes M, Sterkel M, Taracena ML, Tojo M, Tu ZJ, Tubio JM, Ursic-Bedoya R, Venancio TM, Walter-Nuno AB, Wilson D, Warren WC, Wilson RK, Huebner E, Dotson EM, and Oliveira PL
- Subjects
- Animals, Base Sequence, Gene Transfer, Horizontal, Humans, Molecular Sequence Data, Wolbachia genetics, Adaptation, Physiological genetics, Chagas Disease, Host-Parasite Interactions genetics, Insect Vectors genetics, Insect Vectors parasitology, Rhodnius genetics, Rhodnius parasitology, Trypanosoma cruzi physiology
- Abstract
Rhodnius prolixus not only has served as a model organism for the study of insect physiology, but also is a major vector of Chagas disease, an illness that affects approximately seven million people worldwide. We sequenced the genome of R. prolixus, generated assembled sequences covering 95% of the genome (∼ 702 Mb), including 15,456 putative protein-coding genes, and completed comprehensive genomic analyses of this obligate blood-feeding insect. Although immune-deficiency (IMD)-mediated immune responses were observed, R. prolixus putatively lacks key components of the IMD pathway, suggesting a reorganization of the canonical immune signaling network. Although both Toll and IMD effectors controlled intestinal microbiota, neither affected Trypanosoma cruzi, the causal agent of Chagas disease, implying the existence of evasion or tolerance mechanisms. R. prolixus has experienced an extensive loss of selenoprotein genes, with its repertoire reduced to only two proteins, one of which is a selenocysteine-based glutathione peroxidase, the first found in insects. The genome contained actively transcribed, horizontally transferred genes from Wolbachia sp., which showed evidence of codon use evolution toward the insect use pattern. Comparative protein analyses revealed many lineage-specific expansions and putative gene absences in R. prolixus, including tandem expansions of genes related to chemoreception, feeding, and digestion that possibly contributed to the evolution of a blood-feeding lifestyle. The genome assembly and these associated analyses provide critical information on the physiology and evolution of this important vector species and should be instrumental for the development of innovative disease control methods.
- Published
- 2015
- Full Text
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7. Cuticular hydrocarbon variability among Triatoma dimidiata (Hemiptera: Reduviidae) populations from Mexico and Guatemala.
- Author
-
Calderón Fernández G, Juárez MP, Ramsey J, Salazar Schettino PM, Monroy MC, Ordoñez R, and Cabrera M
- Subjects
- Animals, Chromatography, Gas, Cluster Analysis, Discriminant Analysis, Geography, Guatemala, Insect Vectors classification, Mexico, Triatoma classification, Hydrocarbons analysis, Insect Vectors chemistry, Triatoma chemistry
- Abstract
The geographic variation in the cuticular hydrocarbon pattern among 11 populations of Triatoma dimidiata Latreille (Hemiptera: Reduviidae: Triatominae) from different regions of Mexico and Guatemala, was studied using capillary gas chromatography. T. dimidiata populations were differentiated based on the relative amounts of 71 hydrocarbon components. Insect population classification was mostly in agreement with their geographical vicinity; Mexican populations from the Yucatan peninsula grouped together with those from northern Guatemala, insects from the Mexican Gulf coast states were closely related to those collected from northern Oaxaca, and to a lesser extent, to insects from Chiapas. Insects from southern Oaxaca were clustered together with those from southern Guatemala. All these populations were clearly separated from Guatemalan specimens collected in caves from Alta Verapaz.
- Published
- 2005
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