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Inhibition of the growth and development of mosquito larvae of Culex quinquefasciatus(Diptera:Culicidae) treated with extract from leaves of Pseudocalymma alliaceum(Bignonaceae)

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Asian Pacific Journal of Tropical Medicine 2014年第8期7卷 594-601页

作者： Carlos Granados-Echegoyen Rafael Pérez-Pacheco Marcos Soto-Hernndez Jaime Ruiz-Vega luicita lagunez-rivera Nancy Alonso-Hernandez Rene Gato-Armas CIIDIR-OAXACA Instituto Poluécnico NacionalCalle Hornos 1003Santa CruzXoxocotlnOaxacaMéxico.C.P.71230 Colegio de Postgraduados MontecilloEstada de MéxicoMexico Institute de Medicina Tropical "Pedro Kouri" La HabanaCuba

Objective:To determine larvicidal activity of the essential oil,hydrolat and botanical extracts derived from leaves ol Pseudocalymma alliaceum an mosquito larvae of Culex quinquefasciatus.Methods:Groups of twenty lanae were used in the larvicidal assays.The mortality,relative growth rate,the larval and pupal duration and viability was estimated.The essential oil was analyzed by solid phase microextraction using gas chromatography coupled to mass spectrometry.Results:Essential oil at 800 ppm showed larvicidal activity at 24 h with lethal values of LC_(50) and LC_(90) of 267.33 and 493.63 ppm.The hvdrolat at 20% and 10% on 2nd stage larvae showed 100%effectiveness after 24 h.The aqueous extract at 10% had a relative growth index of 0.***.while the ethanolic and methanolic extract obtained values of 0.76 and 0.70 and control reached 0.99.Larvae treated with 10% of methanol,ethanol and aqueous extract showed a reduction in larval duration of 5.00,2.20 and 4.35 days;ethanol extract at 1% provoke decrease of 2.40 days in the development and exhibited an increment of 3.30 days when treated with 0.01%.Aqueous,ethanol and methanol extracts at 10%reduced in 6.15,3.42 and 5.57 days pupal development.The main compounds were diallyl disulfide(50.05%),diallyl sulfide(11.77%) and disulfide di-2-propenyl(10.37%).Conclusions:The study demonstrated for the first time,the larvicidal activity of the essential oil and hydrolat of Pseudocalymma alliaceum:aqueous,ethanol and methanol extracts inhibited the normal growth and development of mosquito larvae,prolonging and delaying larval and pupal duration.

关键词： Pseudocallyma Mosquito control growth inhibition Botanical extracts Essential oils Hydrolat

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Characteristics of the Elastic Response of Isotropic Linear Micropolar Solids under Imposed Loads

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World Journal of Mechanics 2013年第5期3卷 245-255页

作者： Juan Alejandro Vazquez-Feijoo Pedro Montes-García Pator Teodoro Matadamas-Ortiz Nicolas Juárez-Rodríguez luicita lagunez-rivera Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional CIIDIR-Oaxaca IPN Engineering Group Oaxaca Mexico Instituto Tecnológico de Tuxtla Gutiérrez Tuxtla Gutiérrez Mexico

This article proposes a simplified way to solve solid mechanic problems in micropolar elasticity using the solution found in the classic theory of elasticity as a starting point. In this study, an analysis of the linear isotropic micropolar elasticity is conducted based on the properties imposed on the micropolar medium by the constitutive and equilibrium equations. To ascertain how the micropolar medium responses deviate from Hooke’s theory of elasticity, different loading conditions were classified. Three cases have been found so far: the rotational couple response, the quasi-classic equilibrium of momentum response and the general case. This study is the first in a series planned to explore the use of commercial packages of finite element in order to solve micropolar elasticity problems.

关键词： Strength of Materials Elasticity Microcontinuum Micropolar

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