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Chemical constituents and toxicity of Agastache foeniculum (Pursh) kuntze essential oil against two stored-product insect pests
Ebadollahi,Asgar;
Chilean journal of agricultural research , 2011, DOI: 10.4067/S0718-58392011000200005
Abstract: the uncontrolled use of synthetic insecticides is a great hazard for the environment and consumers. essential oils were introduced as low toxic agents against mammals and non-targeted insects. in this study, essential oil from aerial parts of blue giant hyssop (agastache foeniculum [pursh] kuntze) (lamiaceae) was isolated by the water steam distillation method with a clevenger apparatus, and its chemical composition was studied by gas chromatography mass spectrometry. the toxicity of a. foeniculum essential oil against red flour beetle, tribolium castaneum (herbst), and lesser grain borer rhyzopertha dominica (f.) was evaluated by fumigation at 24, 48, and 72 h exposure times. estragole and 1,8-cineole were identified as major constituents of the a. foeniculum oil. fumigation bioassays revealed that a.foeniculum oil had strong insecticidal activity on experimental insects. rhyzopertha dominica was more susceptible than t. castaneum for all exposure times. insecticidal activity varied with essential oil concentration and exposure time. probit analysis showed that increased exposure time and essential oil concentration increased mortality. these results indicated that a. foeniculum essential oil can be applied in the management of stored-product insects to decrease the detrimental effects of synthetic insecticides.
Susceptibility of Two Sitophilus species (Coleoptera: Curculionidae) to Essential Oils from Foeniculum vulgare and Satureja hortensis
Asgar Ebadollahi
Ecologia Balkanica , 2011,
Abstract: This study was conducted to determine the insecticidal activity of essential oils from Fennel, Foeniculum vulgare (Apiaceae), and Summer savory, Satureja hortensis (Lamiaceae), against two stored-product insects. Essential oils from two species of plants were obtained by Clevenger-type water distillation and their fumigant toxicities were tested against adults of the wheat weevil, Sitophilus granarius and rice weevil, Sitophilus oryzae (Curculionidae). The mortality was determined after 24 and 48 hrs from beginning of exposure. LC50 values of each essential oil were estimated for each insect species. Fumigation bioassays revealed that essential oils from two plants had strong insecticidal activity on experimental insects. LC50 values indicated that S. granarius was more susceptible than S. oryzae to essential oils at the exposure time 24 and 48 hrs. The mortality effect of S. hortensis oil was lower than F. vulgare oil. The LC50 values decreased with the duration of exposure to the essential oil concentrations. In all case, responses varied according to plant material, concentration, and exposure time. These results indicated that essential oils from S. hortensis and F. vulgare could be applicable to the management of stored product insects to decrease ecologically detrimental effects of utilization synthetic insecticides.
Chemical constituents and toxicity of Agastache foeniculum (Pursh) kuntze essential oil against two stored-product insect pests Componentes químicos y toxicidad del aceite esencial de Agastachefoeniculum (Pursh) Kuntze contra dos plagas de insectos de productos almacenados
Asgar Ebadollahi
Chilean Journal of Agricultural Research , 2011,
Abstract: The uncontrolled use of synthetic insecticides is a great hazard for the environment and consumers. Essential oils were introduced as low toxic agents against mammals and non-targeted insects. In this study, essential oil from aerial parts of blue giant hyssop (Agastache foeniculum [Pursh] Kuntze) (Lamiaceae) was isolated by the water steam distillation method with a Clevenger apparatus, and its chemical composition was studied by gas chromatography mass spectrometry. The toxicity of A. foeniculum essential oil against red flour beetle, Tribolium castaneum (Herbst), and lesser grain borer Rhyzopertha dominica (F.) was evaluated by fumigation at 24, 48, and 72 h exposure times. Estragole and 1,8-cineole were identified as major constituents of the A. foeniculum oil. Fumigation bioassays revealed that A.foeniculum oil had strong insecticidal activity on experimental insects. Rhyzopertha dominica was more susceptible than T. castaneum for all exposure times. Insecticidal activity varied with essential oil concentration and exposure time. Probit analysis showed that increased exposure time and essential oil concentration increased mortality. These results indicated that A. foeniculum essential oil can be applied in the management of stored-product insects to decrease the detrimental effects of synthetic insecticides. El uso incontrolado de los insecticidas sintéticos causa gran peligro para el medio ambiente y los consumidores. Los aceites esenciales se presentan como agentes tóxicos leves contra mamíferos e insectos no objetivo. En el presente estudio, el aceite esencial de las partes aéreas del hisopo gigante azul (Agastache Foeniculum [Pursh] Kuntze) (Lamiaceae) se aisló por el método de destilación al vapor de agua, utilizando un aparato de Clevenger y se estudió su composición química mediante cromatografía de gases y espectrometría de masas. La toxicidad del aceite esencial de A. foeniculum se evaluó por métodos de fumigación a las 24, 48 y 72 h contra el escarabajo rojo de la harina (Tribolium castaneum (Herbst)) y el barrenador menor de granos (Rhyzopertha dominica (F.)). El estragol y 1,8-cineole se detectaron como componentes principales en el aceite A. foeniculum. Los bioensayos revelaron que el aceite de A. foeniculum tuvo una fuerte actividad insecticida sobre los insectos experimentales. R. dominica fue más susceptible que T. castaneum en todos los tiempos. La actividad insecticida varió con las concentraciones de aceite esencial y los tiempos de exposición. El análisis Probit mostró que la mortalidad aumenta con el incremento del tiempo de ex
Toxicity of Essential Oils Isolated from Achillea millefolium L., Artemisia dracunculus L. and Heracleum persicum Desf. Against Adults of Plodia interpunctella (Hübner) (Lepidoptera: Pyralidae) in Islamic Republic of Iran
Asgar Ebadollahi,Shabnam Ashouri
Ecologia Balkanica , 2011,
Abstract: The environmental problems caused by overuse of synthetic insecticide have been the matter of concern in recent years. Essential oils from aromatic plants are recognized as proper alternatives to conventional insecticides. Therefore, this study was conducted to determine the Fumigant toxicity of essential oils from Achillea millefolium, Artemisia dracunculus and Heracleum persicum against adults of Plodia interpunctella under laboratory conditions and mortality was determined after 12, 24, 36 and 48 h from beginning of exposure. The essential oils were extracted from seeds of H. persicum and aerial parts from 1.5 cm of top of A. millefolium, A. dracunculus by hydrodistillation method using a Clevenger apparatus. All essential oil were highly effective against P. interpunctella and the mortality values reached 100% when the adults were exposed to 50, 65 and 80 μl/ l concentrations of A. dracunculus, A. millefolium and H. persicum essential oil, respectively. The LC50 (lethal concentration to kill 50% of the population) values of essential oils from A. dracunculus, A. millefolium and H. persicum were 22.24, 34.80 and 36.96 μl/ l after 24 h fumigation, respectively. On the other hand, A. dracunculus oil was more effective than the other essential oils against P. interpunctella adults. The LC50 values decreased with increasing of exposure times. In all cases, considerable differences in the mortality of insect to essential oils were observed with different concentrations and exposure times. These results suggest that the essential oils of A. millefolium, A. dracunculus and H. persicum have merit further studies as potential fumigants for the management of P. interpunctella or probably other stored-product insects.
Sheaves and Conditional Sets
Asgar Jamneshan
Mathematics , 2014,
Abstract: We study the connection of conditional sets, introduced in [DJKK13], to sheaves and topos theory. We relate a conditional set to a sheaf over a Boolean algebra. We show that conditional sets and functions does not form a topos due to the two-sidedness of the conditional inclusion.
Insecticidal Activity of the Essential Oil Isolated from Azilia eryngioides (Pau) Hedge et Lamond Against Two Beetle Pests
Ebadollah,Asgar; Mahboubi,Mohaddese;
Chilean journal of agricultural research , 2011, DOI: 10.4067/S0718-58392011000300010
Abstract: a large number of plant essential oils have been used against diverse insect pests since they, unlike conventional pesticides, present no risk to humans and the environment. this study was conducted to determine the toxicity of azilia eryngioides (pau) hedge et lamond (apiaceae) essential oil against 1- to 7-d-old sitophilus granarius (l.) (curculionidae) and tribolium castaneum (herbst) (tenebrionidae) adults. the essential oil was obtained from aerial parts of the plant using a clevenger apparatus and analyzed by gas chromatography and mass spectrometry. the major constituents of the oil were α-pinene and bornyl acetate. fumigation bioassays revealed that a. eryngioides oil had a strong insecticidal activity on adult test insects that were exposed to 37.03, 74.07, 111.11, and 148.14 μl l-1 to estimate mean lethal time (lt50) values. mortality increased as concentration and exposure time increased, and reached 100% at the 39-h exposure time and concentrations higher than 111.11 μl l-1. another experiment was designed to determine the mean lethal concentration at the 24-h exposure time (lc50)-, and these values indicated that s. granarius was more susceptible than t. castaneum. it can be concluded that the essential oil of a. eryngioides has potential against two stored-product pests, s. granarius and t. castaneum.
Editorial : Journal of Current Pharmaceutical Research (JCPR): A New Open-Access International Journal in the field of Pharmaceutical Science
Dr. Asgar Ali
Journal of Current Pharmaceutical Research , 2010,
Abstract:
Insecticidal Activity of the Essential Oil Isolated from Azilia eryngioides (Pau) Hedge et Lamond Against Two Beetle Pests Actividad Insecticida del Aceite Esencial Aislado de Azilia eryngioides (Pau) Hedge et Lamond contra Dos Escarabajos Plaga
Asgar Ebadollah,Mohaddese Mahboubi
Chilean Journal of Agricultural Research , 2011,
Abstract: A large number of plant essential oils have been used against diverse insect pests since they, unlike conventional pesticides, present no risk to humans and the environment. This study was conducted to determine the toxicity of Azilia eryngioides (Pau) Hedge et Lamond (Apiaceae) essential oil against 1- to 7-d-old Sitophilus granarius (L.) (Curculionidae) and Tribolium castaneum (Herbst) (Tenebrionidae) adults. The essential oil was obtained from aerial parts of the plant using a Clevenger apparatus and analyzed by gas chromatography and mass spectrometry. The major constituents of the oil were α-Pinene and bornyl acetate. Fumigation bioassays revealed that A. eryngioides oil had a strong insecticidal activity on adult test insects that were exposed to 37.03, 74.07, 111.11, and 148.14 μL L-1 to estimate mean lethal time (LT50) values. Mortality increased as concentration and exposure time increased, and reached 100% at the 39-h exposure time and concentrations higher than 111.11 μL L-1. Another experiment was designed to determine the mean lethal concentration at the 24-h exposure time (LC50)-, and these values indicated that S. granarius was more susceptible than T. castaneum. It can be concluded that the essential oil of A. eryngioides has potential against two stored-product pests, S. granarius and T. castaneum. Una gran cantidad de aceites esenciales de plantas se han utilizado como agentes de control biológico contra diversos insectos plaga, ya que no presentan riesgo para los seres humanos y el medio ambiente, a diferencia de los pesticidas convencionales. Se determinó la toxicidad del aceite esencial de Azilia eryngioides (Pau) Hedge et Lamond (Apiaceae) contra adultos de 1 a 7 días de edad de Sitophilus granarius (L.) (Curculionidae) y Tribolium castaneum (Herbst) (Tenebrionidae). El aceite esencial se obtuvo de las partes aéreas de la planta utilizando un aparato de Clevenger y se analizó por cromatografía de gases por espectrometría de masas. Los principales componentes del aceite fueron α-pineno y acetato de bornilo. El aceite de A. eryngioides tuvo una fuerte actividad insecticida sobre los insectos experimentales. Los insectos adultos fueron expuestos a concentraciones de 37,03; 74,07; 111,11 y 148,14 μL L-1 para estimar el tiempo letal medio (LT50). La mortalidad aumentó con el aumento de concentración y el tiempo de exposición. La mortalidad de ambas especies alcanzó 100% a concentraciones superiores a 111,11 μL L-1 y 39 h de exposición. Otro experimento, dise ado para determinar la concentración letal media en 24 h de exposición (CL50),
Conditional Preference Orders and their Numerical Representations
Samuel Drapeau,Asgar Jamneshan
Quantitative Finance , 2014,
Abstract: We provide an axiomatic framework modeling conditional preference orders based on conditional set theory. Conditional numerical representations of such preference orders are introduced and a conditional version of the theorems of Debreu about the existence of such numerical representations is given. The continuous representations follow from a conditional Debreu's Gap Lemma the proof of which relies on a conditional axiom of choice, free of any measurable selection argument. We provide a conditional von Neumann and Morgenstern representation as well as automatic conditional continuity results, and illustrate them by examples.
Collocation Method for Nonlinear Volterra-Fredholm Integral Equations  [PDF]
Jafar Ahmadi Shali, Parviz Darania, Ali Asgar Jodayree Akbarfam
Open Journal of Applied Sciences (OJAppS) , 2012, DOI: 10.4236/ojapps.2012.22016
Abstract: A fully discrete version of a piecewise polynomial collocation method based on new collocation points, is constructed to solve nonlinear Volterra-Fredholm integral equations. In this paper, we obtain existence and uniqueness results and analyze the convergence properties of the collocation method when used to approximate smooth solutions of Volterra- Fredholm integral equations.
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