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Search Results: 1 - 10 of 218255 matches for " Miguel P. Guerra "
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Reproductive biology in monoecious and gynoecious cucumber cultivars as a result of IBA application
Diola, Valdir;Orth, Afonso I;Guerra, Miguel P;
Horticultura Brasileira , 2008, DOI: 10.1590/S0102-05362008000100006
Abstract: the understanding of both the reproductive biology and the regulation of the sexual expression of cucumber flowers (cucumis sativus) makes crop management easier and can improve fruit yield and quality. the objective of this study was to evaluate the physiological answer of cucumber floral verticils to the application of iba. the experiment was carried out in a greenhouse, in completely randomized blocks, with four replications of 4-plant plots, and treatments applied to a 5 x 2 factorial (0, 50, 100, 200, and 500 μmol of iba, and two cultivars: wisconsin mr28, gynoecious, and caipira, monoecious). cultivar wisconsin mr28 produced in average 7,636 pollen grains (pg) per flower, with a positive linear response to the increase in iba concentration. instead, in cultivar caipira (5,160 pg) all iba concentrations reduced pg production. cultivars did not differ from each other in relation to pg viability (average in vitrogermination of 75.4 and 79.9% to cultivars wisconsin mr28 and caipira, respectively) and in both pg viability increased linearly with the increase in aib concentration. cultivars wisconsin mr28 and caipira presented in average 71.6 and 70.6 seeds per fruit respectively, and responded with an increase in seed number and improvement in fruit general aspect to the rise in iba concentration. the ratio male:female flowers was significantly different between cultivars (4.2:1 and 3.5:1, respectively to cultivars wisconsin mr28 and caipira) and responded in a distinct way to iba concentrations. while in cultivar caipira, iba concentrations near to 100 μmol increased the number of male flowers; in cultivar wisconsin mr28 the same iba concentration reduced it. the two cultivars had a similar number of female flowers. however, whereas it remained relatively stable in cultivar caipira in spite of the increase in iba concentration, there was an increase in the number of female flowers in cultivar wisconsin mr28, as a result of the rise in iba concentration.
La programación de actividades de educación ambiental en el control de vertebrados invasores en las islas de Espa a y Portugal
P. Miguel Martín,R. Paredes Gil,F. J. Guerra Rosado
Ecosistemas , 2004,
Abstract: La dimensión social del problema de las especies introducidas en islas constituye un tema complejo que involucra a un conjunto de colectivos e intereses muy variados. Por ello, los programas de educación ambiental relacionados con este tema deben dise arse desde una perspectiva global que vaya más allá de las actuaciones aisladas y que tenga en cuenta la diversidad de destinatarios involucrados. En el marco del Proyecto LIFE2002NAT/CP/E/000014 denominado "Control de vertebrados invasores en islas de Espa a y Portugal" hemos aplicado un método sistemático de programación de actividades de educación ambiental para dise ar tres programas diferentes y complementarios sobre este tema, definiendo para cada caso la caracterización de los destinatarios específicos así como los objetivos, actividades y criterios de evaluación.
Karyological analysis of the five native Macaronesian Festuca (Gramineae) grasses supports a distinct diploid origin of two schizoendemic groups
Menezes de Sequeira, Miguel,Díaz-Pérez, Antonio,Santos-Guerra, Arnoldo,Viruel, Juan
Anales del Jardín Botánico de Madrid , 2009,
Abstract: A karyological analysis has been conducted of all five native Macaronesian Festuca grasses belonging to fine-leaved F. subg. Festuca sect. Aulaxyper and broad-leaved F. subg. Drymanthele sect. Phaeochloa Loliinae lineages. Chromosomal analyses were made in 30 plants corresponding to 17 populations of the fineleaved F. agustinii, F. jubata, F. francoi and F. petraea and 2 populations of the broad-leaved F. donax. All counts except one tetraploid count were diploids, showing 2n = 14 chromosomes. Diploidy was confirmed for the robust F. donax, nested within a clade of relict ancestral fescues as reported in recent phylogenetic studies, and was also found in the more slender F. agustinii, F. jubata, F. francoi and F. petraea, which are basal to a recently evolved clade of polyploid red fescues. Karyotypes of the two groups are however distinct, with broad-leaved F. donax showing larger and more regular chromosomes and all four fine-leaved taxa showing smaller and more irregular submetacentric chromosomes. Our karyological data indicate that these two groups of diploid fescues correspond to distinct schizoendemics which apparently originated at different times after independent continental colonizations of Macaronesia. Se presenta un análisis cariológico de las cinco especies de Festuca L. autóctonas en Macaronesia pertenecientes a linajes de hojas finas (F. subg. Festuca sect. Aulaxyper) y hojas anchas (F. subg. Drymanthele sect. Phaeochloa) de Loliinae. Los recuentos cromosómicos fueron realizados en 30 individuos correspondientes a 17 poblaciones de las especies de hojas finas F. agustinii, F. jubata, F. francoi y F. petraea y a 2 poblaciones de la especie de hojas anchas F. donax. Todos los recuentos excepto uno tetraploide indicaron que estas especies son diploides, mostrando 2n = 14 cromosomas. La diploidía fue confirmada para la robusta F. donax, emplazada en un clado de festucas relícticas ancestrales, tal como ha sido indicado en recientes estudios filogenéticos, al igual que en las más gráciles F. agustinii, F. cubata, F. francoi y F. petraea, resueltas filogenéticamente en una posición basal en un clado recientemente evolucionado de festucas rojas poliploides. Los patrones cariotípicos de los dos grupos son sin embargo distintos. La especie de hojas anchas F. donax muestra cromosomas metacéntricos mayores y más regulares, mientras que las cuatro especies de hojas finas muestran cromosomas submetacéntricos más peque os y más irregulares. Nuestros datos cariológicos y evolutivos indican que estos dos grupos de festucas diploides corresponden a disti
Somatic embryogenesis in goiabeira serrana: genotype response, auxinic shock and synthetic seeds
GUERRA MIGUEL P.,DAL VESCO LIRIO L.,DUCROQUET JEAN PIERRE H.J.,NODARI RUBENS O.
Revista Brasileira de Fisiologia Vegetal , 2001,
Abstract: The induction and control of in vitro somatic embryogenesis is dependent of a number of factors. The genotype of the mother plant donor of explants and the kind of auxin play essential roles in conferring embryogenic competence. Once obtained somatic embryos may be encapsulated in alginate originating synthetic seeds that can be stored at low temperatures. Considering this the present work aimed at the assessment of five different genotypes, five periods of 2,4-D shock (20 muM for 1, 2, 4, 8 and 16 weeks) (), and different substances supplemented to sodium alginate to obtain synthetic seeds. Zygotic embryos of Feijoa sellowiana were inoculated in basal LP medium (von Arnold and Erikson, 1981) supplemented with Morel?s vitamins, sucrose (3%) and phytagel (0.2%). The highest rates of somatic embryogenesis induction were observed in the genotypes 50-4 and 101. Shock of two weeks in 2,4-D conferred embryogenic competence in the same levels obtained with the shock of 8 weeks. Histological evaluations revealed the direct origin of the somatic embryos from the epidermic surface of cotyledons. Synthetic seeds containing MS salts and sucrose resulted in higher rates of contamination than capsules free of these substances. KNO3 (100 mM) resulted in the opening of 81.2% of the capsules as compared to 0% of opening in the treatment with water.
MICROPROPAGA O DE CAIXETA, Didymopanax morototoni (Aubl.) Dcne. et Planch.
Nilton César Mantovani,Elci T. H. Franco,Miguel P. Guerra,Juarez M. Hoppe
Ciência Florestal , 1998,
Abstract: O presente trabalho objetivou estabelecer um protocolo básico para a micropropaga o da caixeta Didymopanax morototoni (Aubl.) Dcne. et Planch. Segmentos nodais foram desinfestados em hipoclorito de sódio 10 % por diferentes periodos de exposi o, e inoculados em dois meios básicos: WPM (Lloyd & McCown, 1981) e MS (Murashige & Skoog, 1962) suplementados com BAP, TDZ, ANA, GA3 , AIB e carv o ativado em diferentes combina es e concentra es para cada estádio de desenvolvimento. A desinfesta o dos segmentos nodais com hipoclorito de sódio por 10 minutos proporcionou os melhores resultados para o estabelecimento asséptico das culturas. A maior taxa de regenera o e alongamento de brota es foi obtida com o meio WPM contendo 1,0 mg.l-1 de BAP. Contudo após três subcultivos neste mesmo meio observou-se redu o na taxa de multiplica o. O enraizamento das brota es foi obtido no meio WPM suplementado com 1,0 mg.l-1 de AIB. O processo de aclimatiza o possibilitou a sobrevivência das plantulas micropropagadas às condi es ex vitro.
Morbilidad y mortalidad perinatal en el embarazo precoz Perinatal mortality and morbility in the anticipated pregnancy
ángela Vázquez Márquez,Leonardo Margardel Pérez Llorente,Carlos Guerra Verdecia,ángel Miguel Almirall Chávez
Revista Cubana de Obstetricia y Ginecolog?-a , 1998,
Abstract: Se presentan los resultados de un estudio de casos y controles de 310 madres menores de 20 a os, que tuvieron sus partos en el primer semestre de 1996, en el Hospital Provincial Docente "Carlos Manuel de Céspedes", Bayamo, Granma. Como grupo control se tomaron las ma-dres de 20 a os y más en igual número. Se estudiaron diferentes variables encontrando que el 31,62 % de las adolescentes eran menores de 17 a os. El 14,20 % tuvieron el parto antes de las 37 semanas, con el 38,39 % de distocias, fundamentalmente cesáreas, y fueron la desproporción céfalo-pélvica, el sufrimiento fetal agudo y la inducción fallida los diagnósticos más frecuentes. Predominaron en el grupo estudio la hipoxia, el bajo peso, el distress respiratorio, la infección, el íctero y la mortalidad, tanto fetal como neonatal. Se confeccionaron tablas y se compararon los resultados con otros autores. This paper presents the results of a control and case-study of 310 mothers aged under 20 years, whose deliveries occured in the first semester of 1996, in the Faculty Provincial Hospital "Carlos Manuel de Céspedes", Bayamo, Granma. Mothers, aged 20 years and more, in an equal number, were included in a control group. Different variables showing that 31.6 % of adolescents were less than 17 years-old, were studied. 14.20 % had deliveries before 37 weeks, being 38, 39 %, dystocias, mainly cesarean, and cephalo-pelvic disproportion, acute fetal distress and failed induction, are the most frequent diagnosis. In the study group, hypoxia, low birth weight, respiratory distress, infection, ictero and mortality, both fetal and neonatal, prevailed. Tables were made up, and the results were compared with other authors.
L'organització de l'ensenyament a la Universitat o el sistema de les capses xineses
Miguel ángel Santos Guerra
Temps d'Educació , 1992,
Abstract:
Somatic embryogenesis in goiabeira serrana: genotype response, auxinic shock and synthetic seeds
GUERRA, MIGUEL P.;DAL VESCO, LIRIO L.;DUCROQUET, JEAN PIERRE H.J.;NODARI, RUBENS O.;REIS, MAURíCIO S. DOS;
Revista Brasileira de Fisiologia Vegetal , 2001, DOI: 10.1590/S0103-31312001000200001
Abstract: the induction and control of in vitro somatic embryogenesis is dependent of a number of factors. the genotype of the mother plant donor of explants and the kind of auxin play essential roles in conferring embryogenic competence. once obtained somatic embryos may be encapsulated in alginate originating synthetic seeds that can be stored at low temperatures. considering this the present work aimed at the assessment of five different genotypes, five periods of 2,4-d shock (20 mm for 1, 2, 4, 8 and 16 weeks) (), and different substances supplemented to sodium alginate to obtain synthetic seeds. zygotic embryos of feijoa sellowiana were inoculated in basal lp medium (von arnold and erikson, 1981) supplemented with morel?s vitamins, sucrose (3%) and phytagel (0.2%). the highest rates of somatic embryogenesis induction were observed in the genotypes 50-4 and 101. shock of two weeks in 2,4-d conferred embryogenic competence in the same levels obtained with the shock of 8 weeks. histological evaluations revealed the direct origin of the somatic embryos from the epidermic surface of cotyledons. synthetic seeds containing ms salts and sucrose resulted in higher rates of contamination than capsules free of these substances. kno3 (100 mm) resulted in the opening of 81.2% of the capsules as compared to 0% of opening in the treatment with water.
Morbilidad y mortalidad perinatal en el embarazo precoz
Vázquez Márquez,ángela; Margardel Pérez Llorente,Leonardo; Guerra Verdecia,Carlos; Almirall Chávez,ángel Miguel; de la Cruz Chávez,Francisca;
Revista Cubana de Obstetricia y Ginecolog?-a , 1998,
Abstract: this paper presents the results of a control and case-study of 310 mothers aged under 20 years, whose deliveries occured in the first semester of 1996, in the faculty provincial hospital "carlos manuel de céspedes", bayamo, granma. mothers, aged 20 years and more, in an equal number, were included in a control group. different variables showing that 31.6 % of adolescents were less than 17 years-old, were studied. 14.20 % had deliveries before 37 weeks, being 38, 39 %, dystocias, mainly cesarean, and cephalo-pelvic disproportion, acute fetal distress and failed induction, are the most frequent diagnosis. in the study group, hypoxia, low birth weight, respiratory distress, infection, ictero and mortality, both fetal and neonatal, prevailed. tables were made up, and the results were compared with other authors.
Reducción de desastres: indicadores de riesgo asociados al manejo territorial de enfermedades transmitidas por alimentos (ETA)
Yolanda Suárez Fernández (*); Maylín Soca Pérez (*); Yolexis Fabré Rodríguez (*);Maritza Fuentes Cintra (*) ;Miguel Torres (*);,Joel Quintana Guerra(**);Roberto RojoFiallo (**)
REDVET , 2006,
Abstract: el objetivo deincrementar las acciones territoriales dereducción de desastres naturales y susconsecuencias sanitarias en el municipioSan Nicolás de Bari, se evaluaronalgunos indicadores de riesgo asociadosal manejo de las EnfermedadesTransmitidas por Alimentos (ETA) solaso asociadas a los desastres naturales yse propusieron acciones para lareducción de sus riesgos solos o comoconsecuencia de desastres naturales. Losniveles de percepción de riesgos deEnfermedades Transmitidas porAlimentos (ETA) fueron ALTOS paratodos los grupos encuestados, sinrelación estadística con la cultura deprevención en los grupos de población enriesgo y susceptible estudiados, y conrelación estadística de significación conla competencia profesional y esta con lagestión institucional en los trabajadores,profesionales y decisores del sectorsalud. Se concluye sobre la importanciade la capacitación y la cooperaciónintersectorial en el manejo del problemapara una adecuada reducción de losdesastres naturales y sus consecuencias
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