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Search Results: 1 - 10 of 77783 matches for " Juan-Carlos; Zorrilla "
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Primer registro de Aedes albopictus (Skuse) en Venezuela: Importancia como vector de Dengue y acciones a desarrollar
Navarrro,Juan-Carlos; Zorrilla,Adriana; Moncada,Nelson;
Boletín de Malariología y Salud Ambiental , 2009,
Abstract: aedes albopictus (skuse), an important dengue vector but also and other 21 viruses, is for the first time recorded in venezuela as invasive and public health importance species. the specimens were collected in the south general cemetery, west caracas during march 2009, in flower vases under sunlight exposure and with abundant organic detritus. the associated species were in order of abundance: culex corniger, aedes aegypti and toxorhynchites theobaldi, while in previous sampling in february 2009, we have collected cx. quinquefasciatus and cx. corniger, suggesting a possible species succession. as the first report in venezuela of a few specimens, we are unaware of introduction and spread status. reported experience in usa, suggest the possibility of additional introductions or rapid spread from a single focus previous to its species establishment. with this report, we suggest strategies for studies in order to define the status of this introduction, the detection design and a control campaign by central and regional governmental health institutions along with venezuelan academic research institutes.
Aspectos ecológicos de Aedes albopictus (Skuse, 1894) en Caracas, Venezuela
Zorrilla,Adriana; Quintero,Loriana; Del Ventura,Fabiola; Mu?oz,Manuel; Moncada,Nelson; Navarro,Juan-Carlos;
Boletín de Malariología y Salud Ambiental , 2011,
Abstract: we have collected specimens of all life cycle phases of aedes albopictus in caracas city. it occurs mainly in parks and green areas of the city between 900 to 1,490 m altitude, in the following breeding sites: bamboo internodes, fallen spathes of palm, plastic cans, flower pots, bromeliads and water tanks. the females′s biting pattern was bimodal, with a first peak between 7:30-9:30 and the second around 14:30-17:30. the ingurgitation time was 1-2 minutes and the host localization and biting activity was no far from breeding and resting sites. with these preliminary ecological results, we pretend produce useful information to design strategies for ae. albopictus detection and control. we propose considerations and suggestions for an efficient specimen detection and identification by mean of venezuelan public health institutions.
Registros de mayor altitud para mosquitos (Diptera: Culicidae) en Venezuela
Navarro,Juan-Carlos; Del Ventura,Fabiola; Zorrilla,Adriana; Liria,Jonathan;
Revista de Biología Tropical , 2010,
Abstract: highest mosquito records (diptera: culicidae) in venezuela. mosquitoes (diptera: culicidae) are holometabolous insects with aquatic immature stages, which use a broad variety of larval habitats, from ground water bodies to phytothelmata (water deposits in plants) and artificial deposits. the availability of breeding sites often determines the upper limits of mosquito ranges. we built a database with 9 607 records with 432 localities, 19 genera and 254 species. the andean mountains have 77% of the highest mosquito records including aedes euris with record at 3 133 m, followed by three species of anopheles -subgenera kerteszia- with the upper limit of 2 680 m. wyeomyia bicornis and culex daumastocampa at 2 550 m were the highest records in the central- coastal cordillera, while the highest record in pantepui was wyeomyia zinzala at 2 252 m. the species associated with phytothelmata (bromeliaceae and sarraceniaceae) represent 60% of the records. the upper limits of culex quinquefasciatus and anopheles (kerteszia) species could represent the theoretical limit for transmission of filariasis or arboviruses, by culex, and malaria by anopheles (kerteszia) in venezuela. similarly, a vector of dengue, aedes aegypti, has not been not recorded above 2 000 m. rev. biol. trop. 58 (1): 245-254. epub 2010 march 01.
Registros de mayor altitud para mosquitos (Diptera: Culicidae) en Venezuela
Juan-Carlos Navarro,Fabiola Del Ventura,Adriana Zorrilla,Jonathan Liria
Revista de Biología Tropical , 2010,
Abstract: Los mosquitos (Diptera: Culicidae) son insectos holometábolos con estadios inmaduros acuáticos que utilizan una amplia variedad de hábitats larvales, desde cuerpos de agua en el suelo hasta Fitotelmata (depósitos de agua en las plantas) y depósitos artificiales. La disponibilidad de sitios de reproducción a menudo determina el límite superior del ámbito de los mosquitos. Nosotros construimos una base de datos de 9 607 registros, 432 localidades, 19 géneros y 254 especies. La coordillera Andina posee el 77% de los registros con mayor altitud incluyendo Aedes euris con un registro a 3 300 m, seguido por tres especies de Anopheles -subgénero Kerteszia- con una altitud máxima de 2 680 m. Wyeomyia bicornis y Culex daumastocampa a 2 550 m fueron los registros de mayor altitud en la cordillera Costera- Central, mientras que el record más alto en Pantepui fue Wyeomyia zinzala a 2 252 m. El 60% de los registros de máxima altitud están representados por especies asociadas con fitotelmata (Bromeliaceae y Sarraceniaceae). Los límites superiores de Culex quinquefasciatus y Anopheles (Kerteszia) podría representar el límite teórico para la transmisión de filariasis o arbovirus, por Culex y malaria por Anopheles (Kerteszia) en Venezuela. Del mismo modo, un vector del dengue, Aedes aegypti, no ha sido registrado por encima de 2 000 m. Highest mosquito records (Diptera: Culicidae) in Venezuela. Mosquitoes (Diptera: Culicidae) are holometabolous insects with aquatic immature stages, which use a broad variety of larval habitats, from ground water bodies to Phytothelmata (water deposits in plants) and artificial deposits. The availability of breeding sites often determines the upper limits of mosquito ranges. We built a database with 9 607 records with 432 localities, 19 genera and 254 species. The Andean mountains have 77% of the highest mosquito records including Aedes euris with record at 3 133 m, followed by three species of Anopheles -subgenera Kerteszia- with the upper limit of 2 680 m. Wyeomyia bicornis and Culex daumastocampa at 2 550 m were the highest records in the Central- Coastal cordillera, while the highest record in Pantepui was Wyeomyia zinzala at 2 252 m. The species associated with phytothelmata (Bromeliaceae and Sarraceniaceae) represent 60% of the records. The upper limits of Culex quinquefasciatus and Anopheles (Kerteszia) species could represent the theoretical limit for transmission of filariasis or arboviruses, by Culex, and malaria by Anopheles (Kerteszia) in Venezuela. Similarly, a vector of Dengue, Aedes aegypti, has not been not recorded above
Molecular Tracing with Mitochondrial ND5 of the Invasive Mosquito Aedes (Stegomyia) albopictus (Skuse) in Northern South America
Juan-Carlos Navarro,Loriana Quintero,Adriana Zorrilla,Ranulfo González
Journal of Entomology and Zoology Studies , 2013,
Abstract: The widespread invasive Aedes albopictus, the Asian tiger mosquito, a vector of Dengue, Chikungunya and other arboviruses were discovered in Caracas (Venezuela) in 2009 and, separately in Colombia (Leticia 1998, Buenaventura 2001 and Cali 2007). The possible geographic origins were examined using mtDNA sequences NADH 5 (ND5). Sequences were aligned with those from GenBank. Venezuelan populations contained both unique (H14) and Asian-native haplotypes (H3), while the Colombian populations contain one unique (H15) and two common haplotypes (H1, H11) shared with the Brazilian, Hawaian, and Cameroon populations. Haplotype network analyses suggested: 1) Independent introduction into both countries; 2) two independent invasions into Colombia: from the Amazon River (H1) with evidence of founder effect or genetic bottleneck in Leticia, and, another via the Pacific port of Buenaventura from Hawaii (H11); 3) introduction to Venezuela directly from any Asian native range. Potential factors leading to limited genetic variation in mtND5 in the Columbian and Venezuelan populations were also discussed.
Comparing the Surgical Outcomes of Modified Quad and Triangle Tilt Surgeries to other Procedures Performed in Obstetric Brachial Plexus Injury  [PDF]
Rahul K. Nath, Juan-Carlos Pretto, Chandra Somasundaram
Surgical Science (SS) , 2013, DOI: 10.4236/ss.2013.49A003
Abstract:

Purpose: To compare results from our surgical treatment experiences in children with obstetric brachial plexus injuries (OBPI), to those who have had other surgical treatments. Methods: We conducted a retrospective study in our medical records consisting of two groups of OBPI patients. Group 1: 26 OBPI children (16 girls and 10 boys), age range between 2.0 and 12.0 (mean age 6.9), who have undergone surgical treatments at other institutions between 2005 and 2010. Group 2: 45 OBPI children (20 boys and 25 girls), age between 0.7 and 12.9 (mean age 3.7), who have had modified Quad and triangle tilt surgical treatment between 2005 and 2010 at our institution. In both groups Mean modified Mallet scores and radiological scores were measured and compared. All measurements were made at least one year post surgery in both groups. Results: Post-operative mean modified Mallet score was 11.8 ± 2.4 in group 1 patients, whereas post-mean modified Mallet score was 20 ± 2.7 (P < 0.0001) following modified Quad and triangle tilt surgeries in group 2 patients. Further, their radiological scores such as posterior subluxation, and glenoid version were 13.4 ± 21.3 and 30.2 ± 19.1 in group 1, whereas 32.1 ±13.5 (P < 0.0004), and 16.3 ± 11.5 (P < 0.008) in group 2 patients, when compared to normal values of 50, and 0 respectively. Conclusion: Patients who have had mod Quad and triangle tilt for OBPI obtained significantly better functional outcomes in modified total Mallet score as well as in radiological scores, when compared to those OBPI children, who underwent other procedures such as posterior glenohumeral capsulorrhaphy, biceps tendon lengthening, humeral osteotomy, anterior capsule release, nerve transfer/graft, botox and muscle/tendon transfer and release.

Asymmetry in Hilbert's fourth problem
Juan-Carlos Alvarez Paiva
Mathematics , 2013,
Abstract: In the asymmetric setting, Hilbert's fourth problem asks to construct and study all (non-reversible) projective Finsler metrics: Finsler metrics defined on open, convex subsets of real projective $n$-space for which geodesics lie on projective lines. While asymmetric norms and Funk metrics provide many examples of essentially non-reversible projective metrics defined on proper convex subsets of projective $n$-space, it is shown that any projective Finsler metric defined on the whole projective $n$-space is the sum of a reversible projective metric and an exact 1-form.
Clave fotográfica para hembras de Haemagogus Williston 1896 (Diptera: Culicidae) de Venezuela, con nuevo registro para el país
Liria,Jonathan; Navarro,Juan-Carlos;
Boletín de Malariología y Salud Ambiental , 2009,
Abstract: the neotropical genus heamagogus williston includes mosquitoes with diurnal activity and immature breeding on phytotelmata (tree-holes and cut bamboo internodes). haemagogus species have been involved in sylvatic yellow fever transmission, a virus circulating in forest areas in latin america among arboreal primates and marsupials by means of mosquito bite. the genus comprises 28 species, nine of them occurring in venezuela. one of these, haemagogus (comopostegus) clarki, is a new record for this country. we show here an update of the taxonomic status and the geographical distribution of the genus in venezuela and the first photographical key using simple terms for non-expert personnel.
Wyeomyia trujilloi Pulido y Sutil, 1981, nuevo sinónimo de Wyeomyia bicornis (Root, 1928) (Culicidae: Sabethini), con redescripción de la pupa parte de la larva
Navarro,Juan-Carlos; Liria,Jonathan;
Boletín de Malariología y Salud Ambiental , 2007,
Abstract: wyeomyia (wyeomyia) trujilloi pulido & sutil, 1981, is recognized as the synonym of wyeomyia (nunezia) bicornis (root 1928), based on larval chaeototaxy and mouthparts morphology, pupae and male genitals in comparison and analysis with wy. bicornis holotype, topotypes and wy. trujilloi holotype. discussion and characteristics illustration about subgeneric level are provided. the larval mouthparts morphology and pupae chaetotaxy are described and illustrated by first time, and head of larvae chaetotaxy are re-described.
Mayaro: a re-emerging arbovirus in Venezuela and Latin America Mayaro: un arbovirus re-emergente en Venezuela y Latinoamerica
Manuel Mu?oz,Juan-Carlos Navarro
Biomédica , 2011,
Abstract: Mayaro virus produces nonspecific, sublethal disease symptoms, often confused with dengue, but symptoms of arthalgias that can cause incapacitating disability. Outbreaks have been localized and sporadic in the Pan-Amazonia forest since its first isolation in 1954 (Trinidad and Tobago). The literature available is scarce, diverse and dispersed. Mayaro virus is an alphavirus, phylogenetically related to the Semliki forest antigenic complex. UNA and Mayaro viruses are the only viruses of this complex that have been isolated in the New World. Mayaro consists of single-stranded RNA of positive charge, length of 12kb, subdivided into genomic and subgenomic regions, which encode nonstructural and structural proteins respectively. Mayaro shows a great plasticity in vertebrate host infection, whereas high specificity in the family Culicidae (mosquitoes). Risk factors of infection are associated with forest areas of northern South America and the rainy season. Two genotypes of MAYV have been identified, L (Belterra, Brazil) and D (widely distributed in the Pan-Amazonia). The enzootic cycle is similar to the jungle cycle of yellow fever, which involves Haemagogus mosquitoes and monkeys as reservoirs. However the involvement of other secondary vectors and other hosts that may be important in spread of the virus cannot be ruled out. Humans may have high levels of viremia, and efficient experimental transmission has been demonstrated in Aedes aegypti, Aedes albopictus and Aedes scapularis, suggesting a significant risk to public health in urban, rural and peridomestic locations close to enzootic foci of Mayaro virus. El virus Mayaro produce una enfermedad de síntomas inespecíficos y sub-letales, frecuentemente confundida con dengue, con síntomas de artralgias que pueden generar incapacidad laboral. Los brotes han sido esporádicos y localizados en la región selvática de la Panamazonia posterior a su primer aislamiento en 1954 (Trinidad y Tobago). La información en la literatura es escaza, diversa y dispersa. Mayaro es un alphavirus filogenéticamente relacionado al complejo del virus del bosque de Semliki, siendo junto a UNA, los únicos virus de dicho complejo aislados en el nuevo mundo. Está conformado por ARN de cadena simple de carga positiva, longitud de 12kb con la región 42S y 26S, que codifican para proteínas no estructurales y estructurales. El virus Mayaro presenta gran plasticidad de infección en vertebrados y especificidad hacia la familia Culicidae (mosquitos) como vectores/hospedadores invertebrados. Los factores de riesgo están asociados a zonas boscosas
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