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Search Results: 1 - 10 of 225434 matches for " Claudia Cerón-González "
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Evaluación de insecticidas sintéticos sobre adultos de Metamasius spinolae (Coleoptera: Curculionidae) procedentes de Tlalnepantla, Morelos Evaluation of synthetic insecticides on Metamasius spinolae (Coleoptera: Curculionidae) adults from Tlalnepantla, Morelos
Claudia Cerón-González,Esteban Rodríguez-Leyva,J. Refugio Lomeli-Flores,Claudia E. Hernández-Olmos
Revista mexicana de ciencias agrícolas , 2012,
Abstract: El picudo del nopal, Metamasius spinolae (Gyllenhal), es una de las plaga más importantes en nopal verdura (Opuntia ficus-indica (L.) Miller) en México y en especial en Tlalnepantla, Morelos, la segunda región de importancia en la producción de este cultivo con alrededor de 2 500 ha. Tanto adultos como larvas causan da o al cultivo, la larva realiza galerías en las pencas maduras y el adulto da a los márgenes de los nopalitos. A pesar de que no existen plaguicidas autorizados en México para su control, este hecho no limita a los productores para el uso de productos químicos sin conocer su efectividad. Por esta razón, en este trabajo se evaluó la efectividad de ocho insecticidas pertenecientes a dos grupos, organofosforados y piretroides, sobre adultos de este curculiónido. Las pruebas de laboratorio y campo realizadas durante 2007 mostraron que el Malatión causó una mortalidad similar a otros productos del mismo grupo que son más tóxicos (Paratión Metílico y Metidatión). Por otro lado, sólo un insecticida piretroide (Permetrina), proporcionó una mortalidad cercana a 86%, en comparación con los tres restantes (Cipermetrina, Deltametrina y Fenvalerato) que lograron mortalidades menores a 20%. Existió una respuesta diferencial del sexo del insecto a los insecticidas, las hembras mostraron menor susceptibilidad que los machos a algunos productos, tales como Diazinón, Permetrina y Cipermetrina. Este es el primer reporte formal de la evaluación de productos químicos en este insecto y se discuten algunos problemas relacionados con su manejo. The cactus weevil, Metamasius spinolae (Gyllenhal), is one of the most important pests in prickly pear (Opuntia ficus-indica (L.) Miller) in Mexico and especially in Tlalnepantla, Morelos, the second most important region in the production of this crop, with about 2 500 ha. Both adults and larvae cause damage to this crop; larvae make galleries in mature pads and adults damage young pads of the cactus. Although there are no authorized pesticides for its control in Mexico, this fact does not stop farmers from using synthetic insecticides without knowing their effectiveness. For this reason, this study evaluated the effectiveness of eight pesticides in two chemical groups, organophosphates and pyrethroids, on adults of this insect. The laboratory and field tests conducted in 2007 showed that malathion caused a mortality similar to other more toxic products in the same group (Methyl Parathion and Methidathion). On the other hand, only a pyrethroid insecticide (Permethrin) provided a mortality rate close to 86%, in comparison
Evaluación de insecticidas sintéticos sobre adultos de Metamasius spinolae (Coleoptera: Curculionidae) procedentes de Tlalnepantla, Morelos
Cerón-González, Claudia;Rodríguez-Leyva, Esteban;Lomeli-Flores, J. Refugio;Hernández-Olmos, Claudia E.;Pe?a-Martínez, Rebeca;Mora-Aguilera, Gustavo;
Revista mexicana de ciencias agrícolas , 2012,
Abstract: the cactus weevil, metamasius spinolae (gyllenhal), is one of the most important pests in prickly pear (opuntia ficus-indica (l.) miller) in mexico and especially in tlalnepantla, morelos, the second most important region in the production of this crop, with about 2 500 ha. both adults and larvae cause damage to this crop; larvae make galleries in mature pads and adults damage young pads of the cactus. although there are no authorized pesticides for its control in mexico, this fact does not stop farmers from using synthetic insecticides without knowing their effectiveness. for this reason, this study evaluated the effectiveness of eight pesticides in two chemical groups, organophosphates and pyrethroids, on adults of this insect. the laboratory and field tests conducted in 2007 showed that malathion caused a mortality similar to other more toxic products in the same group (methyl parathion and methidathion). on the other hand, only a pyrethroid insecticide (permethrin) provided a mortality rate close to 86%, in comparison to the remaining three (cypermethrin, deltamethrin and fenvalerate) which caused a mortality of under 20% mortality. there was a differential response of the sex of the insect to insecticides, in which females were less susceptible than males to some products, such as diazinon, permethrin and cypermethrin. this is the first formal report of the evaluation of synthetic insecticides in this insect and we discuss some issues related to management.
Characterization of cellulolytic activities of Bjerkandera adusta and Pycnoporus sanguineus on solid wheat straw medium
Quiroz-Casta?eda,Rosa E; Balcázar-López,Edgar; Dantán-González,Edgar; Martinez,Alfredo; Folch-Mallol,Jorge; Martínez Anaya,Claudia;
Electronic Journal of Biotechnology , 2009,
Abstract: cellulolytic properties of two white rot fungi, bjerkandera adusta and pycnoporus sanguineus, cultivated on wheat straw agar medium, were characterized and compared. optimal growing parameters for maximum enzyme production for both fungi were wheat straw medium ph 5 and 28oc. b. adusta showed, on the 6th day of culture, carboxymethylcellulose (cmc)ase activity levels 1.6 times higher than maximal p. sanguineus activity, achieved on the 8th day. b. adusta supernatants also displayed higher activity levels towards xylan (3.6-fold) compared to those of p. sanguineus. however, enzymes from p. sanguineus were more robust resisting one hour incubation at high temperatures (up to 80oc), and exhibiting activity and stability in ph range from 2 to 8. cellulolytic activities, with molecular masses ranging from 25 to 90 kda, from the two species were detected in zymograms.
Medicina basada en evidencia y políticas de salud pública, el caso de la nueva Ley de Tránsito
Millán-González,Ricardo;
Acta Médica Costarricense , 2011,
Abstract: evidence based medicine is a methodological approach that allows us to discriminate worldwide available information with the intention to clarify clinical questions and thus make the best decisions for a given population. one area where there is adequate scientific support is the one that links the consumption of alcohol and driving with a series of epidemiological variables, with a significant increased risk of accidents and with the fact that preventive measures are able to reduce the mortality rate. therefore the current traffic law is deeply questioned in two areas: the allowed levels of blood concentration of alcohol and the absence of restrictions on the age groups most prone to accidents when alcohol is ingested. it is necessary to apply these concepts in the national legislation, and for that the college of physicians and surgeons of costa rica has a preponderant role.
Mutilación genital en paciente transexual: ?manifestación de un espectro patológico imprecisamente definido?
Millán-González,Ricardo;
Revista Colombiana de Psiquiatría , 2010,
Abstract: introduction: traditionally, genital self-mutilation has been considered a psychotic reaction in or outside the religious context. there are good data supporting the fact that it is not as infrequent as once thought and that psychosis might not always be present as a psycho-pathological determinant. objectives: to review the literature concerning genital self-mutilation and to redefine its psychopathological conception. method: case report. results: the presentation of a patient with gender identity disorder who failed in the attempt to perform an orchidectomy on himself. the act, motivated by a deep body image distortion, happened without evident psychosis as assessed clinically and by psychological batteries. as far as we know, this is the first case reported in the latin-american scientific community. conclusions: this kind of acts could be one of several points of clinical confluence in a continuum of disorders whose most important psychopathologic element would be self body image distortion and not necessarily psychosis. this group of entities eventually could be grouped into a new categorical section of future diagnostic classifications in psychiatry.
Consentimientos informados y aprobación por parte de los comités de ética en los estudios de antipsicóticos atípicos para el manejo del delírium
Millán-González,Ricardo;
Revista Colombiana de Psiquiatría , 2012,
Abstract: introduction: delirium is an acute alteration of consciousness and cognition. atypical antipsychotics (aa) have recently become a main part of its treatment. studies in this population generate a series of ethical dilemmas concerning the voluntary participation of patients and their state of vulnerability since their mental faculties are, by definition, compromised. objective: to assess whether studies with aa for the treatment of delirium obtained an approval by an ethics committee on human research (echr), if an informed consent (ic) was obtained, whether the ic was verbal or written, and who gave the approval to participate. method: systematic review of medline for studies of delirium where quetiapine and olanzapine were the main treatment, assessing the existence of an echr approval and implementation of an ic. results: 11 studies were identified (6 of quetiapine and 5 of olanzapine). 5 had an echr approval. conclusions: most studies examining the treatment of delirium with quetiapine or olanzapine were not subject to approval by an echr and most of them did not obtain an ic from the patient's legal guardian. it is essential that future studies of antipsychotics and other drugs for the treatment of delirium have the protocol approved by an echr and a written ic signed by the patient's legal representative, since by definition delirium is a condition that compromises superior mental processes.
El rol educativo de la psiquiatría de enlace The Role of Liaison Psychiatry
Ricardo Millán-González
Revista Colombiana de Psiquiatría , 2010,
Abstract:
Consentimientos informados y aprobación por parte de los comités de ética en los estudios de antipsicóticos atípicos para el manejo del delírium Informed Consent and the Approval by Ethics Committees of Studies Involving the Use of Atypical Antipsychotics in the Management of Delirium
Ricardo Millán-González
Revista Colombiana de Psiquiatría , 2012,
Abstract: Introducción: El delírium es una alteración aguda de la conciencia y la cognición que ha empezado a manejarse con antipsicóticos atípicos (AA). Debido a que las facultades mentales, por definición, se ven afectadas, los estudios en esta población generan dilemas éticos respecto a la participación voluntaria de los pacientes y su estado de vulnerabilidad. Objetivo: Valorar si los estudios realizados con AA para el tratamiento del delírium obtuvieron una aprobación por un comité de ética en investigación en seres humanos (CEISH), si hubo aplicación de un consentimiento informado (CI), si este era verbal o escrito y quién dio la aprobación para la participación en el protocolo. Dise o: Revisión sistemática en MedLine de los estudios de delírium que emplearon quetiapina y olanzapina y valoración de la existencia de aprobación por un CEISH y de la aplicación de un CI. Resultados: Se detectaron 11 estudios (6 de quetiapina y 5 de olanzapina), de los cuales 5 contaron con la aprobación del protocolo por un CEISH. Conclusiones: La mayoría de los estudios para el tratamiento del delírium no fueron sometidos a su aprobación por parte de un CEISH ni obtuvieron (de forma exclusiva) el CI de participación por parte del apoderado legal del paciente. Es fundamental que los futuros estudios de antipsicóticos y otros fármacos cuenten con la aprobación del protocolo por parte de un CEISH y de la firma del CI por parte del representante legal del paciente. Introduction: Delirium is an acute alteration of consciousness and cognition. Atypical antipsychotics (AA) have recently become a main part of its treatment. Studies in this population generate a series of ethical dilemmas concerning the voluntary participation of patients and their state of vulnerability since their mental faculties are, by definition, compromised. Objective: To assess whether studies with AA for the treatment of delirium obtained an approval by an ethics committee on human research (ECHR), if an informed consent (IC) was obtained, whether the IC was verbal or written, and who gave the approval to participate. Method: Systematic review of Medline for studies of delirium where quetiapine and olanzapine were the main treatment, assessing the existence of an ECHR approval and implementation of an IC. Results: 11 studies were identified (6 of quetiapine and 5 of olanzapine). 5 had an ECHR approval. Conclusions: Most studies examining the treatment of delirium with quetiapine or olanzapine were not subject to approval by an ECHR and most of them did not obtain an IC from the patient's legal guardian. It is
Mutilación genital en paciente transexual: manifestación de un espectro patológico imprecisamente definido?
Ricardo Millán-González
Revista Colombiana de Psiquiatría , 2010,
Abstract: Introducción: Tradicionalmente, la automutilación genital se ha considerado un evento psicótico dentro del contexto religioso o fuera de éste. Aunque catalogado como un hecho muy infrecuente antes del advenimiento de internet, existen elementos para pensar que la incidencia es cada vez mayor y que la psicosis como factor psicopatológico no siempre estaría presente. Objetivos: Revisar la literatura sobre la automutilación genital y formular un replanteamiento teórico sobre su concepción psicopatológica. Método: Reporte de caso. Resultados: A continuación se presenta el caso de un paciente con un trastorno de identidad de género que intentó fallidamente realizarse la autocastración. El hecho, motivado por una profunda distorsión de la imagen corporal, ocurrió sin evidencia de psicosis, según la evaluación clínica y de pruebas psicológicas. Hasta donde se tiene conocimiento, este es el primer caso que se reporta en la literatura latinoamericana. Conclusiones: Estos actos podrían ser uno de varios puntos de confluencia clínica de un continuo de trastornos cuyo principal elemento psicopatológico sería la distorsión de la imagen corporal y no necesariamente la psicosis. Estas entidades eventualmente podrían ser incluidas dentro de una nueva sección categorial en las futuras clasificaciones diagnósticas en psiquiatría. Introduction: Traditionally, genital self-mutilation has been considered a psychotic reaction in or outside the religious context. There are good data supporting the fact that it is not as infrequent as once thought and that psychosis might not always be present as a psycho-pathological determinant. Objectives: To review the literature concerning genital self-mutilation and to redefine its psychopathological conception. Method: Case report. Results: The presentation of a patient with gender identity disorder who failed in the attempt to perform an orchidectomy on himself. The act, motivated by a deep body image distortion, happened without evident psychosis as assessed clinically and by psychological batteries. As far as we know, this is the first case reported in the Latin-American scientific community. Conclusions: This kind of acts could be one of several points of clinical confluence in a continuum of disorders whose most important psychopathologic element would be self body image distortion and not necessarily psychosis. This group of entities eventually could be grouped into a new categorical section of future diagnostic classifications in psychiatry.
Medicina basada en evidencia y políticas de salud pública, el caso de la nueva Ley de Tránsito Evidence-Based Medicine and Public Health Policies, the case of the new Traffic Law
Ricardo Millán-González
Acta Médica Costarricense , 2011,
Abstract: La medicina basada en evidencia es una corriente metodológica que permite discriminar la información existente a nivel mundial, con la intención de aclarar dudas clínicas y así tomar las mejores decisiones para una población determinada. Un ámbito donde existe un adecuado sustento científico es aquel que vincula el consumo de licor y la conducción de vehículos con una serie de variables epidemiológicas, con un importante aumento del riesgo de accidentes, y con el hecho de que medidas preventivas son capaces de reducir la mortalidad por esta causa. Por lo tanto, se cuestionan los niveles tolerados por la actual Ley de Tránsito y la ausencia de mayores restricciones a los grupos etáreos más propensos a accidentarse cuando se ha ingerido alcohol. Es indispensable la aplicación de estos conceptos en la legislación nacional, y en ello el Colegio de Médicos y Cirujanos de Costa Rica tiene un papel preponderante. Evidence Based Medicine is a methodological approach that allows us to discriminate worldwide available information with the intention to clarify clinical questions and thus make the best decisions for a given population. One area where there is adequate scientific support is the one that links the consumption of alcohol and driving with a series of epidemiological variables, with a significant increased risk of accidents and with the fact that preventive measures are able to reduce the mortality rate. Therefore the current Traffic Law is deeply questioned in two areas: the allowed levels of blood concentration of alcohol and the absence of restrictions on the age groups most prone to accidents when alcohol is ingested. It is necessary to apply these concepts in the national legislation, and for that the College of Physicians and Surgeons of Costa Rica has a preponderant role.
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