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Evaluación de la Eficacia, Efecto Residual y de Volteo de Aplicaciones en Pretrasplante de Insecticidas Nicotinoides y Mezclas de Nicotinoide-Piretroide para el Control de Myzus persicae nicotianae (Hemiptera: Aphididae) en Tabaco Evaluation of Efficacy, Residual and Knock Down Effects of Pretransplant Applications of Nicotinoid and Nicotinoid-Pyrethroid Insecticide Mixtures for the Control of Myzus persicae nicotianae (Hemiptera: Aphididae) on tobacco
Eduardo Fuentes-Contreras,Esteban Basoalto,Claudio Sandoval,Patricia Pavez
Agricultura Técnica , 2007,
Abstract: Se evaluaron aplicaciones en pretrasplante en almacigueros de tabaco (Nicotiana tabacum L.) de imidacloprid, acetamiprid y tiametoxam, y una mezcla de imidacloprid y ciflutrina para el control del áfido Myzus persicae nicotianae Blackman. La dosis de imidacloprid de 14 g i.a. m-2 de almaciguero presentó mortalidades corregidas superiores al 80% casi permanentemente hasta los 75 días después de la aplicación (DDA) a las 48 h de la colocación de los áfidos sobre las plantas. En otro experimento acetamiprid en dosis de 5,6 g i.a. m-2 de almaciguero y tiametoxam en dosis de 7 g i.a. m-2 de almaciguero mantuvieron este mismo nivel de mortalidad corregida hasta los 50 y 30 DDA, respectivamente. A partir de los 30 DDA para todos los insecticidas evaluados en ambos experimentos, la mortalidad corregida a las 24 h fue menor que a las 48 h de la colocación de los áfidos sobre las plantas tratadas, lo cual muestra un limitado efecto de volteo de estos tratamientos. Finalmente, en otro experimento la mezcla de imidacloprid con ciflutrina en dosis de 10,5 y 0,21 g i.a. m-2 de almaciguero, respectivamente, presentó un buen efecto de volteo, con mortalidades corregidas superiores al 80% hasta los 70 DDA a las 48 h y sin diferencias significativas con la mortalidad corregida a las 24 h desde la colocación de los áfidos sobre las plantas. Pretransplant applications of imidacloprid, acetamiprid and thiamethoxam, and a mixture of imidacloprid and cyfluthrin were evaluated on tobacco (Nicotiana tabacum L.) seedbeds for the control of the aphid Myzus persicae nicotianae Blackman. Corrected mortality at 48 h after aphid release on plants in a seedbed was over 80% almost permanently up to 75 days after application (DAA) with a dose of 14 g a.i. m-2 seedbed of imidacloprid. In another experiment, the same level of corrected mortality was maintained by doses of 5.6 g a.i. m-2 seedbed of acetamiprid and 7 g a.i. m-2 seedbed of thiamethoxam up to 50 and 30 DAA, respectively. After 30 DAA for all the insecticides evaluated in both experiments, corrected mortality at 24 h was lower than at 48 h after aphid release on treated plants, which shows a limited knock down effect of these treatments. Finally, in another experiment a mixture of 10.5 and 0.21 g a.i. m-2 seedbed of imidacloprid and cyfluthrin, respectively, showed a good knock down effect, with corrected mortality higher than 80% up to 70 DAA at 48 h and without significant differences with corrected mortality at 24 h after aphid release on plants.
Computing Symbolic Expressions in Analog Circuits Using Nullors
Tlelo Cuautle, Esteban;Carlos, Sánchez López;Sandoval Ibarra, Federico;
Computación y Sistemas , 2005,
Abstract: a novel method is introduced to compute symbolic expressions in analog circuits modeled by nullors. the proposed method is based on the formulation of a compact system of equations (cses) by manipulation of data-structures, which highly improves traditional symbolic-methods. it is demonstrated that by modeling all active devices using nullors, the cses is easily formulated by manipulation of both the nullor and admittance interconnection-relationships. several examples leads us to conclude on the suitability of the proposed symbolic-method to be incorporated within a symbolic simulator.
Evaluación de la Eficacia, Efecto Residual y de Volteo de Aplicaciones en Pretrasplante de Insecticidas Nicotinoides y Mezclas de Nicotinoide-Piretroide para el Control de Myzus persicae nicotianae (Hemiptera: Aphididae) en Tabaco
Fuentes-Contreras,Eduardo; Basoalto,Esteban; Sandoval,Claudio; Pavez,Patricia; Leal,Claudia; Burgos,Raúl; Mu?oz,Cristián;
Agricultura Técnica , 2007, DOI: 10.4067/S0365-28072007000100002
Abstract: pretransplant applications of imidacloprid, acetamiprid and thiamethoxam, and a mixture of imidacloprid and cyfluthrin were evaluated on tobacco (nicotiana tabacum l.) seedbeds for the control of the aphid myzus persicae nicotianae blackman. corrected mortality at 48 h after aphid release on plants in a seedbed was over 80% almost permanently up to 75 days after application (daa) with a dose of 14 g a.i. m-2 seedbed of imidacloprid. in another experiment, the same level of corrected mortality was maintained by doses of 5.6 g a.i. m-2 seedbed of acetamiprid and 7 g a.i. m-2 seedbed of thiamethoxam up to 50 and 30 daa, respectively. after 30 daa for all the insecticides evaluated in both experiments, corrected mortality at 24 h was lower than at 48 h after aphid release on treated plants, which shows a limited knock down effect of these treatments. finally, in another experiment a mixture of 10.5 and 0.21 g a.i. m-2 seedbed of imidacloprid and cyfluthrin, respectively, showed a good knock down effect, with corrected mortality higher than 80% up to 70 daa at 48 h and without significant differences with corrected mortality at 24 h after aphid release on plants.
Resources to visualize some paradoxes that happens in the planet Mercury
Esteban, Esteban
Revista Eureka sobre Ense?anza y Divulgación de las Ciencias , 2011,
Abstract: En este trabajo se exponen una serie de circunstancias muy curiosas que se producen en el planeta Mercurio, relativas al movimiento del Sol respecto a su horizonte. También se explica la manera de hacer un modelo que permita visualizar algunas de ellas y la forma de escenificar otras.
Description and ontogenetic morphometrics of nymphs of Belminus herreri Lent & Wygodzinsky (Hemiptera: Reduviidae, Triatominae)
Rocha, Dayse da S.;Patterson, James S.;Sandoval, Claudia M.;Jurberg, José;?ngulo, Victor M.;Esteban A., Lyda;Galv?o, Cleber;
Neotropical Entomology , 2005, DOI: 10.1590/S1519-566X2005000300019
Abstract: for the first time all instars of a species of the genus belminus are described based on laboratory f1 generation specimens from adults caught in department of cesar, colombia. ontogenetic morphometrics of postembryonic head development was made, suggesting that the greatest changes occur between the 1st and 2nd instars.
Indicadores físicos del suelo bajo labranza de conservación y su relación con el rendimiento de tres cultivos
Navarro Bravo, Agustín;Figueroa Sandoval, Benjamín;Martínez Menes, Mario;González Cossio, Félix;Osuna Ceja, Esteban Salvador;
Agricultura técnica en México , 2008,
Abstract: soil physical management implies the optimization, near the plant root zone (plant rhizosphere), of the physical properties such as: structure, porosity, infiltration, and water retention, among others. these characteristics are important for the sustained management of the soil and for the identification of soil physical indicators. for that reason the agroecosystem faba bean-corn-dry bean rotation, under conservation tillage, was evaluated in order to know the physical indicators throughout the physical and chemical soil properties related to crop yield. the research was conducted at the colegio de posgraduados, texcoco, state of mexico during 2006. measured soil properties were: mechanic resistance, bulk density, organic matter, electric conductivity, porosity, distribution of particle size, usable moisture, saturated and residual, saturated hydraulic conductivity, accumulated infiltration and sorbility. likewise, faba bean, corn and common bean seed yield, were measured. data were analyzed throughout multiple and simple regression analysis. results indicate that organic matter content and saturated hydraulic conductivity are the soil indicators that define seed yield in the three studied crops under conservation tillage.
Feeding sources and natural infection of Belminus herreri (Hemiptera, Reduviidae, Triatominae) from dwellings in Cesar, Colombia
Sandoval, Claudia Magaly;Duarte, Rosemere;Gutíerrez, Reinaldo;Rocha, Dayse da Silva;Angulo, Victor Manuel;Esteban, Lida;Reyes, Marlen;Jurberg, José;Galv?o, Cleber;
Memórias do Instituto Oswaldo Cruz , 2004, DOI: 10.1590/S0074-02762004000200004
Abstract: belminus herreri, originally described from specimens collected in panama, was considered entirely silvatic until to 2000 when it was found for the first time in a domestic habitat in colombia. in 2001, during a new search of houses in the department of cesar, colombia, 121 specimens were collected. study of their feeding sources using an elisa test revealed that 96% of these specimens had fed on cockroaches (blattidae). however, a small proportion of these b. herreri specimens also showed the presence of trypanosoma cruzi in their gut contents, suggesting a possible role for these insects in the epidemiology of chagas disease.
Optimal Selection and Allocation of Sectionalizers in Distribution Systems Using Fuzzy Dynamic Programming  [PDF]
Albornoz Esteban, Andreoni Alberto
Energy and Power Engineering (EPE) , 2010, DOI: 10.4236/epe.2010.24040
Abstract: This paper describes a calculation strategy that allows determining the optimal number and placement of sectionalizing switches in MV radial distribution networks, in correspondence to technical, regulatory and economical aspects. A formulation that takes into account the investment, maintenance and power interruption costs has been developed, seeking for a reduction in total costs while taking care of the regulatory and technical aspects. A multicriteria optimization procedure allows incorporating in the calculating process various quality indicators which can be either global or individual indexes. This way of formulation makes the proposal flexible as well as applicable to allow including aspects that were not considered in previous papers. The solution methodology is mainly based on dynamic programming, fuzzy logic, heuristics and economic analysis techniques. Given its flexibility, the proposed tool is easily adapted to real distribution systems, by considering the individual requirements of each network. The solutions obtained in simulations are oriented to help decision-making for the operator.
Hypertrophic osteoarthropathy as the cause of situs inversus totalis: A case report  [PDF]
Esteban Grandy, Giuseppe Grandy
Open Journal of Internal Medicine (OJIM) , 2012, DOI: 10.4236/ojim.2012.24032
Abstract: Situs inversus totalis is a very rare anomaly. Even more, cases of situs inversus totalis plus hypertrophic osteoarthropathy. A woman presented with cyanosis, clubbing of fingers and distal edema. Chest examination revealed heart sounds at the right side and a heart murmur. Abdominal examination showed liver dullness in the left side. The X-rays showed dextrocardia and liver in the left side. The Upper digestive barium test showed the stomach in the right side, the barium enema showed caecum on the left. Treatment for heart failure improved the patient’s condition and she remained well. When she became pregnant, developed heart failure again and required admission. She was compensated and continued her pregnancy. 3 years later she developed heart and respiratory refractory failure, was admitted again and after few days she died. We report this case of situs inversus totalis in association with hypertrophic osteoarthropathy because of the rarity of this anomaly.
Thinking about Aging: Experience, Identity and Meaning among an Elderly Population in the Philippines  [PDF]
Rolando C. Esteban
Advances in Aging Research (AAR) , 2015, DOI: 10.4236/aar.2015.45015
Abstract: The paper aims to know the idioms that the elderly use to describe and make sense of their experience of aging. It is based on ethnographic data gathered through the in-depth interview of 30 normal and community dwelling elderly in Marikina City, Metro Manila, Philippines in 2012-2013. The participants were chosen through compulsive sampling from the registry of 1385 senior citizens screened free from dementia. Their age ranged from 60 to 90 years, regardless of social class, gender, ethnicity, religion and other indices of difference. The interviews were transcribed, verbatim, and coded for the idioms, their meanings and contexts in which the elderly used them. The elderly communicate in idioms, which maybe basic to denote identity that obtains from aging or secondary in that they develop from the basic ones and help define identity further. The idioms relate to either continuity or discontinuity theory of aging or help rationalize what it means to be human and elderly.
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