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Search Results: 1 - 10 of 1305 matches for " Zamora-Natera "
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Anatomía foliar y del pecíolo de cuatro especies de Lupinus (Fabaceae) Foliar and petiole anatomy of four species of Lupinus (Fabaceae)
Juan Francisco Zamora-Natera,Teresa Terrazas
Revista mexicana de biodiversidad , 2012,
Abstract: Se describe y compara la anatomía foliar y del pecíolo de 4 especies del género Lupinus (L. aschenbornii S.Schauer, L. exaltatus Zucc., L. montanus Kunth y L. reflexus Rose) que se distribuyen en un gradiente altitudinal en el Parque Nacional Nevado de Colima. Las hojas se fijaron en campo y se procesaron mediante la técnica de inclusión en parafina. Parte de las láminas se deshidrataron para caracterizar la superficie foliar por medio del microscopio electrónico de barrido. Las especies comparten la epidermis papilosa de paredes anticlinales con diferentes grados de ondulación, estomas anomocíticos, tricomas simples lineares y mesofilo bifacial. Los folíolos de L. montanus son glabros en la superficie abaxial, las estrías cuticulares sobre las células localizadas en la base de los tricomas es un rasgo característico de L. montanus y de L. reflexus. Las diferencias encontradas en espesor de la lámina y del mesofilo así como la abundancia de ceras epicuticulares pueden estar influenciadas por el ambiente. Distintivamente, el número y distribución de haces vasculares en los pecíolos difieren entre las 4 especies y podrían ser de utilidad para diferenciarlas si estos resultados se confirman al estudiar un mayor número de especies de Lupinus. The aims of this study were to describe and compare the foliar and petiole anatomy of 4 species of Lupinus (L. aschenbornii S.Schauer, L. exaltatus Zucc., L. montanus Kunth, and L. reflexus Rose) distributed in an elevation gradient at Parque Nacional Nevado de Colima. Leaves were fixed in the field and prepared using the paraffin embedding technique. In addition, part of the blades was dehydrated to describe leaf surface through the scanning electron microscope. The 4 species shared a papillose epidermis with undulated anticlinal walls in different degrees, stomata anomocytic, simple unicellular trichomes, and bifacial mesophyll. Leaflets of L. montanus are glabrous on the abaxial surface, whereas cells with a striate cuticle at the base of the trichomes are a shared trait of L. montanus and L. reflexus. Differences found on blade and mesophyll thickness as well as the abundance of epicuticular waxes could be an environmental effect. The petiole of the 4 species differed in the number and distribution of vascular bundles, and could be useful to distinguish them if these results are confirm by studying a larger number of species of Lupinus.
Composición de alcaloides en semillas de Lupinus mexicanus (Fabaceae) y evaluación antifúngica y alelopática del extracto alcaloideo
Zamora-Natera, Francisco;García-López, Pedro;Ruiz-López, Mario;Salcedo-Pérez, Eduardo;
Agrociencia , 2008,
Abstract: plants synthesize secondary metabolites that can be isolated and used in agriculture as an alternative for the control of pests and diseases. capillary gas chromatography-mass spectrometry (cg-ms) was used to analyze the composition of alkaloids in seeds of lupinus mexicanus. in addition, an in vitro study was made of the antifungal and allelopathic activity of the crude extract of alkaloids. the antifungal action of the extract was evaluated based on the inhibition of the mycelial growth of the phytopathogenic fungi sclerotium rolfsii, rhizoctonia solani and fusarium oxysporum, while the allelopathic activity was evaluated on the germination of seeds of amaranthus hybridus and echinochloa crus-galli. the analysis of alkaloids from the extract revealed the presence of lupanine, 3β-hydroxylupanine, multiflorine aphylline, epiaphylline and α-isolupanine as majority compounds. the extract, at the concentration of 3 mg ml-1, significantly inhibited the mycelial growth of r. solani by 87.7%, whereas the mycelial growth of s. rolfsii was only inhibited 72.5% with the highest concentration. only the germination of seeds of a. hybridus showed significant differences from the effect of the extract, and inhibition of germination was 80% with the highest concentration (1 mg ml-1). lupanine was the most abundant alkaloid (76.2%) in the extract of seeds of l. mexicanus. the extract showed inhibitory activity of the mycelial growth of r. solani and s. rolfsii, and a phytotoxic or inhibitory effect on the germination of seeds of a. hybridus.
Evaluación de lodos residuales como abono orgánico en suelos volcánicos de uso agrícola y forestal en jalisco, méxico
Salcedo-Pérez,Eduardo; Vázquez-Alarcón,Antonio; Krishnamurthy,Laksmy; Zamora-Natera,Francisco; Hernández-álvarez,Efrén; Rodríguez Macias,Ramón;
Interciencia , 2007,
Abstract: sewage sludge applications to agricultural and forest soils represent an important alternative for reuse of materials with a high nutrient content. the effects of different application rates of sewage sludge as organic fertilizer on corn production and pinus douglasiana development were studied. the experiments were established in a volcanic soil of the central region of jalisco, mexico. the application 10 and 20t·ha-1 of dry sewage sludge and of sludge compost mixed with garden residues on corn yield was evaluated. the materials were homogeneously applied on the ground, using a randomized complete block design with five replications. both the corn and fodder yield (dry matter base) increased as a result of the addition of sludge and compost in 18 and 22%, respectively. the effects of different application rates of dry sewage sludge (0, 30, 60 and 100g/tree) on the initial development of pinus douglasiana were also evaluated. application of sludge at the highest rate significantly improved the establishment of pinus douglasiana (83%) after 14 months, whereas the control only reached 67%. at the highest rates of application, both height and diameter of tree steams were increased by ~18%. application of sewage sludges as an organic fertilizer improved the corn production and the initial development of pinus douglasiana on volcanic soils.
Composición y concentración de alcaloides en Lupinus Exaltatus zucc. durante su crecimiento y desarrollo
Zamora-Natera,Francisco; García-López,Pedro; Ruiz-López,Mario; Rodríguez-Macías,Ramón; Salcedo-Pérez,Eduardo;
Interciencia , 2009,
Abstract: due to its nutritional characteristics, lupinus exaltatus is considered as an alternative source of animal feed in temperate regions. however, the presence of quinolizidine alkaloids in different plant organs limits its consumption. the composition and concentration of alkaloids in leaves, stems, flowers, and inmature fruits of l. exaltatus was determined in five different phenological stages with the final purpose of suggesting alternatives for its management and use as forage. plants were sowed in pots and at each phenological stage six plants were harvested and separated in roots, stems, leaves, flowers, and inmature pods that were air dried to constant weight. each organ was analyzed for alkaloid composition and content by capillary gas chromatography- mass spectrometry (gc-ms). in each phenological stage and in all organs the alkaloid profile was characterized by the presence of six major alkaloids: epiaphylline aphylline, a-isolupanine, lupanine, dehydro-oxosparteine and 3-b-hydroxylupanine. although the alkaloid profile was constant, the total concentration in the different organs showed a significant variation (0.31-2.1%) in the different phenological stages. in general, after the five growth stages the stems showed the lowest average total alkaloid concentration (0.63%) whereas inmature pods had the highest total alkaloids (1.95%). lupanine was the major alkaloid in stems and fruits. although alkaloids with the highest toxicity (sparteine, anagyrine and ammodendrine) were not detected, the results indicate that the major risk for intoxication could occur during pod growth and seed ripening, due to high total alkaloid content and larger abundance of lupanine in immature fruits.
UNA PROPUESTA DE CLASIFICACIóN DE LAS EXPLOTACIONES LIMONERAS DE LA PROVINCIA DE MáLAGA A PARTIR DE MéTODOS DE ANáLISIS MULTIVARIANTE
Juan José Natera Rivas,Ana Ester Batista Zamora
Cuadernos Geográficos , 2009,
Abstract: A partir de los microdatos correspondientes al último Censo Agrario (1999), complementados con información cualitativa procedente de entrevistas, en la presente contribución proponemos una clasificación de las explotaciones limoneras malague as. Definidas como tales aquellas cuya Orientación Técnicoeconómica se engloba en el grupo cítricos y que cuentan en su Superficie Agrícola Utilizada con limón, para la construcción de la clasificación hemos empleado métodos de análisis multivariante -análisis de componentes principales y cluster de k medias-. Además, también aportamos la distribución, para municipios seleccionados, de las explotaciones limoneras según el cluster en el que han quedado incluidas.
Usos del rayo Laser en Odontologia restauradora: Primera parte. Aspectos generales, clasificacion, interrelacion con los tejidos vivos y precauciones en el uso
Natera G,Alfredo E.;
Acta Odontológica Venezolana , 2000,
Abstract: the purpose of this work is to start a group of articles to give you the knowledge about the use of laser technology in restorative dentistry. in this article you will read about the origin and physical fundaments of laser, how it′s classify and types availables for this specific area of dentistry, its relation with tissues, and caution during the use of it. next publications you will read about specifications of each kind of laser used in restorative dentistry.
Imperio y fin de sciécle. El 11 de septiembre: una perspectiva crítica
CONTRERAS NATERA,MIGUEL áNGEL;
Cuadernos del Cendes , 2007,
Abstract: this paper seeks to disclose the u.s. government security and defense strategy after the september 11, 2001 attacks. first, the fundamental propositions of the project for the new american century, its tactics and objectives are described. the links between that strategy and the global restructuring plans are then presented, highlighting the implicit goals of the imperial globalism. third, the rationales for the just war against terrorism are addressed together with the legal devices supporting the intervention. finally, the article underlines the factual rearrangement of territories, economies and subjectivities under the armed neoliberalism tenet and giorgio agamben′s homo sacer notion.
Impensando la ciudadanía moderna: alteridad y racismo en el sistema mundial
CONTRERAS NATERA,MIGUEL áNGEL;
Cuadernos del Cendes , 2003,
Abstract: the purpose of the following text is to argue about alterity′s problems, its concomitants and implications in the debate about the broadness of citizenship rights. we start, thus, a critical dialogue with philosopher richard rorty′s intellectual work, considering the context of the globalization proceses. to start with, we show rorty′s defense of we/us/our on the conteporary debate about the factum of pluralism. secondly, we entail westerns ethnocentrism?s defense with practices of racism on the world-system′s social cultural sphere. besides, we inquire about the interactions between racism, cultural resistances, and the memory of politics. finally we abide by the theoretic and practical consequences of the precedent researches, and try to model possible cultural politics? actions on the radical democratic paradigm.
El proyecto neoconservador y el 11 de septiembre: en memoria de Norbert Lechner
Contreras Natera,Miguel ángel;
Cuadernos del Cendes , 2008,
Abstract: the present essay establishes the relationship between the neoliberal thought and the north american foreign policy after september 11, 2001. first, it deals with the origins of neoconservative thinking in the context of the cold war. second, it addresses the program content of neoconservativism as an answer to the emergence of counterculture movements during the sixties. in the third place, the neoconservative critic of western modernity is explained, followed by an analysis of the neoconservative offensive from september 11, 1973 on and the restructuration processes it induces. finally, it establishes the relationship between the project for the new american century and the usa foreign policy in the context of september 11, 2001.
Escritura a través del currículo en Colombia: situación actual y desafíos (Writing Across the Curriculum in Colombia: Current Situation and Challenges) (Ecriture à travers le curriculum en Colombie: situation actuelle et défis) (A escrita através do currículo na Col mbia: situa o atual e desafios)
Violeta Molina Natera
Magis International Journal of Research in Education , 2012,
Abstract: ResumenLa escritura es la base para la construcción y difusión del conocimiento en la Educación Superior, aunque todas las disciplinas tengan formas particulares de ha- cerlo. Este artículo de reflexión contextualiza un mo- vimiento pedagógico poco estudiado en Colombia, muestra su evolución histórica, las bases conceptuales que lo sustentan (enfoque cognitivo y retórico) y la relación con la situación de Colombia a partir de los re- sultados de la investigación Para qué se lee y se escribe en las universidades de Colombia? Un aporte a la conso- lidación de la cultura académica, en la que participa- ron 17 universidades. Analiza parte de los resultados y concluye con unos importantes desafíos para ser con- siderados por las diferentes instancias que conforman la Educación Superior.AbstractWriting is the basis for the construc- tion and dissemination of knowledge in higher education, although all dis- ciplines have particular ways of doing it. This article contextualizes reflection understudied educational movement in Colombia, showing its historical evolution, the conceptual underpin- ning it (cognitive approach and rheto- ric) and the relationship with the situ- ation in Colombia from the results of the investigation, Why reading and writing is for in universities of Colom- bia?, a contribution to the consolida- tion of the academic culture, with the participation of 17 universities. It discusses some of the results and concludes with some important chal- lenges to be considered by the various bodies that make higher education.RésuméL'écriture est la base pour la construc- tion et diffusion de la connaissance dans le domaine de l'éducation supé- rieure, bien que toutes les disciplines aient des fa ons particulières de le faire. Cet article de réflexion replace dans son contexte un mouvement pé- dagogique peu étudie en Colombie, et il montre son évolution historique, les bases conceptuelles que le soutiennent (la perspective cognitive et rhétorique) et le rapport avec la situation en Co- lombie à partir des résultats de la re- cherche intitulée Pourquoi lire et écrire dans les universités colombiennes?, une contribution à la consolidation de la culture académique dans cette re- cherche ont participé 17 universités. On analyse une partie des résultats et on conclut avec une liste d'impor- tants défis qui doivent être considérés par rapport aux différentes étages qui conforment l'éducation supérieure.ResumoAinda que cada disciplina tenha suas formas particulares de construir e di- fundir o conhecimento na Educa o Superior, a escrita é a base comum para
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