993 resultados para Pez mosquito


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The unnatural threo-6-acetoxy-5-hexadecanolide and the natural mosquito oviposition pheromone erythro-6-acetoxy-5-hexadecanolide were synthesized in a diastereodivergent fashion in 44% and 33% overall yield respectively from 5-bromovaleric acid and undecanal. The key step utilized a chemoenzymatic epoxidation-lactonization of a naturally available fatty acid to form the 6-hydroxy-5-hexadecanolide core.17 The epoxidation strategy was later adapted to allow for an asymmetric synthesis. Shi epoxidation afforded highly enantioenriched (5R, 6R)-6-hydroxyhexadecanolide (er = 10) in 70 % overall yield. Other derivatives of the chiral ketone catalyst were also screened. Finally, attempts were made to obtain the correct stereochemistry at C(6) of the target with a dynamic kinetic transformation using lipase and a transfer hydrogenation catalyst. Epimerization of the lactol with the transfer hydrogenation catalyst was successful, but lipase mediated reactions halted at <10 % conversion.

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Tesis (Maestría en Ciencias, con especialidad en Química Analítica) U.A.N.L.

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Tesis (Maestría en Ciencias con Especialidad en Ecología Acuática y Pesca) U.A.N.L.

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Tesis (Maestría en Ciencias con Especialidad en Parasitología) U.A.N.L.

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Tesis (Maestría en Ciencias de la Ingeniería Eléctrica con Especialidad en Potencia) - U.A.N.L, 1997

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UANL

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Tesis (Doctor en Ciencias Biológicas con acentuación en Entomología Médica) U. A. N. L., Facultad de Ciencias Biológicas, 2007.

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Tesis (Doctor en Ciencias Biológicas) U.A.N.L. Facultad de Ciencias Biológicas, 2007.

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Tesis (Doctorado en Ciencias con Acentuación en Entomología Médica) UANL, 2013.

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In the last decades considerable headway has been made in research and development of phyto-chemical pesticides. The most notable recent success is the commercial development of neem products for insect control. The present investigation on Environmentally Compatible Phyto-Chemical Larvicides for Mosquito Control was undertaken to identify plants of the locality with potential larvicidal activity on mosquito larvae. This has been achieved by screening 17 plant species against four mosquito species. The observation and data are compiled in six chapters .

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The present study was initiated when several massive outbreaks of Chikungunya, Dengue and Japanese Encephalitis were frequently reported across the State of Kerala. Multiple symptoms persisted among the affected individuals and the public health officials were in search of aetiological agents responsible for the out breaks and, other than clinical samples no resources were available. In this context, a study was undertaken to focus on mosquito larvae to investigate the viruses borne by them which remain silently prevalent in the environment. The study was not a group specific investigation limited to either arbovirus or enterovirus, but had a broad spectrum approach. The study encompassed the viral pathogens that could be isolated, their impact when passaged through cell lines, growth kinetics, titer of the working stocks in specific cell line, the structure by means of transmission electron microscopy(TEM), the one step growth and molecular characterization using molecular tools.

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Se aborda de manera particular el análisis de las exenciones concedidas por el Estado mediante la Ley 218 de 1995, más conocida como la Ley Páez, tras la emergencia económica que sufrieron los Departamentos de Cauca y Huila. Se debaten los conceptos de gasto público y ahorro fiscal.

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Realizado por los miembros del seminario de Ciencias Naturales de Ibiza. Los objetivos de esta unidad didáctica son el conocimiento de la anatomía del pez, aprender a diseccionarlo, diferenciar los órganos internos más importantes, y conocer su mecánica de respiración.

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Los objetivos son el conocimiento del pez, diferenciar sus partes más importantes y conocer su mecánica de respiración.