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Search Results: 1 - 10 of 471224 matches for " Jairo A.; Torres "
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ESTUDIO MORFOLóGICO, HISTOLóGICO Y ULTRAESTRUCTURAL DE LA NODULACIóN DE Frankia - Morella pubescens H. & B. ex Willdenow, (Myricaceae) "in situ"
TORRES RODRíGUEZ,GERARDO ANDRéS; MURCIA VELASCO,JAIRO A;
Biotecnología en el Sector Agropecuario y Agroindustrial , 2008,
Abstract: morella pubescens h. y b. ex willdenow is a plant that carries out a symbiosis with an actinomicet of the species frankia over the radical tissue of certain plants, which makes it known as actinorrize, of which 270 species are found and by which dinitrogen, contained in an unavailable form in the atmosphere can be fixed symbiotically to organic nitrogen: nitrates and ammonia. the work has as its objective to characterize the structures and infective process in the symbiotic association of frankia sp in the roots of morella pubescens. the nodes were collected, their external morphology was described and they were processed for high resolution optic microscopy, electronic transmission and tinctures of histo-chemistry. the results showed a very organized infection pattern and structures typical of invasion by frankia sp in the radical tissue of the plant, clearly observed in the ultra structure of the hiphas and fixed vesiculars of nitrogen
Costos de Transacción y Formas de Gobernación de los Servicios de Consulta en Colombia
TORRES,SERGIO; GARCíA,RAFAEL GUILLERMO; QUINTERO,JOHN JAIRO;
Cuadernos de economía , 2007, DOI: 10.4067/S0717-68212007000200005
Abstract: this paper evaluates the extent to which the establishment of the different governance forms linking hospitals to insurance companies in bogotá is carried out taking into account transaction costs reduction criteria. an empirical test is applied, using the transaction dimensions proposed by williamson (1985). hypotheses are tested by a combination of the acceptability analysis stochastic method and multiple discriminant analysis. we conclude that both hospitals and insurance companies seek to reduce production costs, while transaction costs are not relevant to the decision
ESTUDIO MORFOLóGICO, HISTOLóGICO Y ULTRAESTRUCTURAL DE LA NODULACIóN DE Frankia - Morella pubescens H. & B. ex Willdenow, (Myricaceae) "in situ" MORPHOLOGIC, HISTOLOGIC AND ULTRASTRUCTURAL STUDY OF THE NODULATION OF Frankia-Morella pubescens H. y B. ex Willdenow, (Myricaceae)"in situ"
GERARDO ANDRéS TORRES RODRíGUEZ,JAIRO A MURCIA VELASCO
Biotecnología en el Sector Agropecuario y Agroindustrial , 2008,
Abstract: Las raíces de Morella pubescens H. & B. ex Willdenow, se encuentran en simbiosis con el actinomiceto del género Frankia, conocido como actinorriza. La simbiosis le permite a la planta fijar dinitrógeno y al actinomiceto adquirir fuentes de carbono. Se conocen aproximadamente 270 especies de plantas que presentan este mismo tipo de simbiosis. Este trabajo tiene como objetivo caracterizar las estructuras y proceso infectivo en la asociación simbiótica de Frankia sp en las raíces de Morella pubescens. Los nódulos se colectaron se describieron en su morfología externa y se procesaron para Microscopia óptica de alta resolución, Electrónica de Transmisión y tinciones de histoquímica. Los resultados mostraron un patrón de infección muy organizado y las estructuras típicas de la invasión por parte de Frankia sp en el tejido radicular de la planta observándose claramente la ultraestructura de las hifas y vesículas fijadoras de nitrógeno Morella pubescens H. y B. ex Willdenow is a plant that carries out a symbiosis with an actinomicet of the species Frankia over the radical tissue of certain plants, which makes it known as actinorrize, of which 270 species are found and by which dinitrogen, contained in an unavailable form in the atmosphere can be fixed symbiotically to organic nitrogen: nitrates and ammonia. The work has as its objective to characterize the structures and infective process in the symbiotic association of Frankia sp in the roots of Morella pubescens. The nodes were collected, their external morphology was described and they were processed for high resolution optic Microscopy, Electronic Transmission and tinctures of histo-chemistry. The results showed a very organized infection pattern and structures typical of invasion by Frankia sp in the radical tissue of the plant, clearly observed in the ultra structure of the hiphas and fixed vesiculars of nitrogen
Costos de Transacción y Formas de Gobernación de los Servicios de Consulta en Colombia
SERGIO TORRES,RAFAEL GUILLERMO GARCíA,JOHN JAIRO QUINTERO
Cuadernos de Economía , 2007,
Abstract: Este trabajo examina en qué medida los hospitales de tercer nivel de complejidad en Bogotá seleccionan diferentes formas de gobernación de servicios de salud con empresas promotoras de salud -EPS-, respondiendo a criterios de reducción de costos de transacción. Se usan las dimensiones de la transacción propuestas por Williamson (1985) para realizar la prueba empírica. Las hipótesis se contrastan mediante el método estocástico de análisis de aceptabilidad y análisis discriminante múltiple. Se concluye que tanto las EPS como los hospitales buscan la reducción de costos de producción, en tanto que los costos de transacción no son relevantes en la decisión This paper evaluates the extent to which the establishment of the different governance forms linking hospitals to insurance companies in Bogotá is carried out taking into account transaction costs reduction criteria. An empirical test is applied, using the transaction dimensions proposed by Williamson (1985). Hypotheses are tested by a combination of the acceptability analysis stochastic method and multiple discriminant analysis. We conclude that both hospitals and insurance companies seek to reduce production costs, while transaction costs are not relevant to the decision
Tumores neuroendocrinos: Presentación de dos casos de tumores carcinoides del pulmón
GUZMáN-TORO,FERNANDO; TORRES,JAIRO; GUERRERO HERNáNDEZ,YUSBELYS A; GABRIELA NEGRóN DE TORRES,MARíA; ,;
Revista Venezolana de Oncología , 2007,
Abstract: the carcinoid tumors are a group of neoplasm that represents a rare variety of tumors derived from the neural crest. in the lung are rare. the carcinoid are neoplasm of endobronquial location and the clinical manifestations includes in both: atelectasy, recurrent pneumonia, pulmonary abscess and bronquiectasy. we presented the cases of two patients whom consult by cough, respiratory difficulty and hemoptysis, there are being observed in the two cases the presence of right lung actelectasy in the thorax x-ray. the flexible fibrobronchoscopy realized reported an endobronchial neoplasm localized in one patient in the inferior right lobe and in the other patient a lesion in the entrance of the principal right bronchus. the surgical procedure development in one patient included: an inferior right lobectomy and in the other a right neumonectomy. the hispatological study in both cases reported: carcinoid tumor.
Neurofibroma subglótico diagnóstico y tratamiento quirúrgico
GUZMáN-TORO,FERNANDO; TORRES,JAIRO; GUERRERO HERNáNDEZ,YUSBELYS A; NEGRóN DE TORRES,MARíA GABRIELA; ,;
Revista Venezolana de Oncología , 2007,
Abstract: el neurofibroma de laringe es una patología muy poco frecuente, clínicamente se caracteriza por una sintomatología asociada a la obstrucción de la vía aérea superior. se presenta el caso de un paciente masculino de 54 a?os de edad quien consulta por estridor y disnea, se le practica una fibrobroncoscopia flexible que reporta la presencia de una tumoración subglótica de tama?o 3x3 cm. se realiza como procedimiento quirúrgico: una cervicotomía y laringofisura a través del cartílago tiroides con exposición del área subglótica y resección completa de la tumoración, cuyo resultado histológico reportó un neurofibroma. la evolución posoperatoria fue satisfactoria, actualmente el paciente se encuentra sin recidiva de la tumoración posterior a cinco a?os de evaluación continua.
Neurofibroma subglótico diagnóstico y tratamiento quirúrgico
FERNANDO GUZMáN-TORO,JAIRO TORRES,YUSBELYS A GUERRERO HERNáNDEZ,MARíA GABRIELA NEGRóN DE TORRES
Revista Venezolana de Oncología , 2007,
Abstract: El neurofibroma de laringe es una patología muy poco frecuente, clínicamente se caracteriza por una sintomatología asociada a la obstrucción de la vía aérea superior. Se presenta el caso de un paciente masculino de 54 a os de edad quien consulta por estridor y disnea, se le practica una fibrobroncoscopia flexible que reporta la presencia de una tumoración subglótica de tama o 3x3 cm. Se realiza como procedimiento quirúrgico: una cervicotomía y laringofisura a través del cartílago tiroides con exposición del área subglótica y resección completa de la tumoración, cuyo resultado histológico reportó un neurofibroma. La evolución posoperatoria fue satisfactoria, actualmente el paciente se encuentra sin recidiva de la tumoración posterior a cinco a os de evaluación continua.
Tumores neuroendocrinos: Presentación de dos casos de tumores carcinoides del pulmón
FERNANDO GUZMáN-TORO,JAIRO TORRES,YUSBELYS A GUERRERO HERNáNDEZ,MARíA GABRIELA NEGRóN DE TORRES
Revista Venezolana de Oncología , 2007,
Abstract: Los tumores carcinoides son un grupo de neoplasias poco frecuentes, y representan una variedad de tumores derivados de la cresta neural, en el pulmón son de aparición rara. Los carcinoides son de localización endobronquial y clínicamente se presentan como atelectasias, neumonía recurrente, absceso pulmonar y bronquiectasias. Se reportan los casos de dos pacientes quienes consultaron por tos, dificultad respiratoria y hemoptisis, observándose en la radiografía de tórax de ambos presencia de atelectasias en el campo pulmonar derecho. Se realiza fibrobroncoscopia flexible y se evidencian en ambos casos una lesión endobronquial localizada en un paciente en el bronquio lobar inferior derecho y en el otro paciente en el bronquio principal derecho. En uno de los pacientes se realizó lobectomía inferior derecha y en otro paciente una neumonectomía derecha, reportando el estudio histopatológico en ambos casos la presencia de un tumor carcinoide. The carcinoid tumors are a group of neoplasm that represents a rare variety of tumors derived from the neural crest. In the lung are rare. The carcinoid are neoplasm of endobronquial location and the clinical manifestations includes in both: atelectasy, recurrent pneumonia, pulmonary abscess and bronquiectasy. We presented the cases of two patients whom consult by cough, respiratory difficulty and hemoptysis, there are being observed in the two cases the presence of right lung actelectasy in the thorax x-ray. The flexible fibrobronchoscopy realized reported an endobronchial neoplasm localized in one patient in the inferior right lobe and in the other patient a lesion in the entrance of the principal right bronchus. The surgical procedure development in one patient included: an inferior right lobectomy and in the other a right neumonectomy. The hispatological study in both cases reported: carcinoid tumor.
Identification of Colletotrichum species causing anthracnose on Tahiti lime, tree tomato and mango
Martínez,Erika P.; Hío,Juan C.; Osorio,Jairo A.; Torres,María F.;
Agronomía Colombiana , 2009,
Abstract: in colombia, citrus, tree tomato and mango crops are likely to suffer considerable losses from anthracnose caused by several colletotrichum species, which were identified by the present study on infected organs of the three fruit crops, sampled in different regions of the country. identification was based on their morphological and molecular characteristics, as well as on fungicide (benomyl and copper hydroxide) sensitivity and pathogenicity tests. the latter assessed infectivity on both the original hosting crop and the other two crops (crossed infection), by putting the fungi in contact with organs taken from the three fruit crops. molecular identification of the colletotrichum species was carried out through amplification of rdna its regions by means of c. gloeosporioides (cgint) and c. acutatum (caint2) specific primer pcr combining the use of its4 universal primer. the results indicate that c. acutatum is the infectious agent in tahiti lime and tree tomato, and so is c. gloeosporioides in mango. although c. acutatum is the infectious agent in two different fruit species, the strains proved to be specific of their original hosts.
EFECTOS DE LA EXPOSICIóN A DIFERENTES CRITERIOS DE LOGRO EN LA ELABORACIóN DE PREGUNTAS INFORMALES
TAMAYO,JAIRO; PADILLA-VARGAS,MARíA ANTONIA; GONZáLEZ-TORRES,MARINA LILIANA;
Acta Colombiana de Psicología , 2009,
Abstract: the effect of providing differential information regarding achievement criteria while making informal questions related to everyday life and whose formulation does not require a specialized training was evaluated. achievement criteria defined as the specification of the requirements an individual must meet or to which he should adjust .previous studies have indicated the need to evaluate the conditions that allow the development of question-asking skills in different contexts. one of the necessary elements of this task may be the previous specification of the criteria a question must meet (specification of the achievement criteria). the experimental design involved the exposure to different achievement criteria. participants were 60 students from high school, as well as college undergraduate and graduate students. results indicated that the groups exposed to the more specific criteria developed a greater number of questions, and these were more relevant to the situation. undergraduate and graduate students performed more effectively than the high-school ones. findings are discussed in terms of the implications of being able to pose pertinent questions (in academic contexts).
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