Mostrando recursos 1 - 20 de 389.454

  1. Sistema de mejoramiento genético de trigo en México

    Villaseñor Mir, Héctor Eduardo
    Wheat improvement in Mexico began in 1946 and worked with an organized scheme that yielded benefits to gain control of stem rust, achieve self-sufficiency in 1957 and reap its record production of 5.5 MT in 1985. In the 90's the support was removed for production and improvement, and research decays, resulting in loss of self-sufficiency. The creation in 2004 of the Product System Wheat (CONASIST) gave good interaction between the links and facilitated capture demands to finance a project of 2006-2008 that generated 10 new varieties. CONASIST in 2010, also boosted finance improvements, so the purpose of this paper is...

  2. Uso de la androesterilidad genética masculina en la reconversión de genotipos para realizar selección recurrente en trigo

    Villaseñor Mir, Héctor Eduardo; Hortelano Santa Rosa, René; Martínez Cruz, Eliel; Huerta Espino, Julio; García León, Elizabeth; Espitia Rangel, Eduardo
    The conversion of fertile male sterile elite genotypes is important to efficiently implement MSFRS in wheat, as it will be the genetic basis to represent the progress made by the program and platform for future genetic progress. The aim of the research is to evaluate the advantages of the dominant male sterile mutant “Oly” in the conversion and incorporation of character elite wheat material. 20 genotypes from the program of rainfed wheat from the INIFAPCEVAMEX were used and, as the source of infertility the caused by a single dominant gene called “Oly”. Once the single cross of fertile male-sterile plants...

  3. Caracterización morfológica en genotipos nativos de aguacate (Persea americana Mill.) de clima tropical en Nayarit, México

    López Guzmán, Graciela Guadalupe; Medina Torres, Raúl; Guillén Andrade, Héctor; Ramírez Guerrero, Leobarda Guadalupe; Juárez López, Porfirio; Ruelas Hernández, Pablo Germán
    ayarit is part of the natural distribution are of avocado (Persea americana Mill.), so it has a great diversity of native types. The characterization and evaluation of these plant genetic resources for determining its potential as a source of germplasm utility. The aim of this study was to characterize morphologically 24 genotypes of native avocado of tropical climate in Nayarit, Mexico. Of each genotype, 10 leaves and 10 fruits at physiological maturity were taken, 23 qualitative and quantitative descriptors of leaves, fruits and seeds phenotypic characteristics were recorded; also evaluating the oil content in the pulp of fruits. Principal component...

  4. Evaluación agronómica de maíces raza Zapalote chico en la región Istmeña de Oaxaca

    Cabrera Toledo, José Manuel; Carballo Carballo, Aquiles; Aragón Cuevas, Flavio
    Con el propósito de conocer el comportamiento de poblaciones sobresalientes de maíz de la raza Zapalote chico, se realizó la evaluación agronómica de 18 criollos sobresalientes. Las poblaciones sobresalientes se han caracterizado y conservado, a la vez que se avanza en la selección y mejoramiento de cuatro variedades superiores. Las evaluaciones de campo se desarrollaron durante cuatro ciclos de cultivo en los terrenos experimentales del Instituto Tecnológico de Comitancillo, Oax. Se registraron 10 variables. El diseño experimental fue completamente al azar con dos repeticiones. Los resultados demostraron diferencias altamente significativas para variedades, año agrícola y para la interacción de ambos...

  5. Engenharia Genética: Busca da mercadoria perfeita?

    Souza, José Neivaldo de
    Resenha:Engenharia Genética: busca da mercadoria perfeita? -SANDEL, Michael J. Contra a Perfeição: ética na era da engenharia genética. 1ª.ed. Tradução por Ana Carolina Mesquita. Rio de janeiro: Civilização Brasileira, 2013. 160p. 

  6. Modelo de turismo sostenible para la no dependencia petrolera en el yasuní

    Chauca Pozo, Cristina; Soto Aguirre, Ronald; López Sánchez, Rodrigo
    Ecuador tiene una de las reservas naturales más grandes e importantes del mundo y de las comunidades internacionales;  la Reserva Yasuní que comprende 982.000 hectáreas de bosque húmedo tropical, bosque inundado, pantanos, ríos, lagunas, por lo que es de suma importancia preservar este ecosistema ya que contiene la mayor diversidad genética en el mundo, también contiene una gran variedad de especies, haciéndolo superior a cualquier otro ecosistema.En el 2007, el Estado Ecuatoriano presentó la iniciativa Yasuní ITT en el debate de las Naciones Unidas, en el que se propuso dejar 850 millones de barriles de crudo bajo el subsuelo del...

  7. Análisis comparativo de los Operadores Genéticos de Cruce Puntual SPX y Uniforme UX aplicados a la resolución del problema de optimización PathFinder

    Zambrano Vega, Cristian Gabriel
    En el presente trabajo se emplea un estudio experimental de dos variantes de un algoritmo evolutivo estándar para la exploración de un laberinto (PathFinder) que le permita a un robot encontrar el mejor camino de salida a partir de su ubicación dentro del mismo. La primera variante del algoritmo emplea el Operador Genético de Cruce Puntual SPX (“point crossover”) y la segunda el Operador Uniforme UX (“uniform crossover”). Los laberintos de prueba están formados por un tamaño de NxM posiciones con un 20% de ellas representadas como obstáculos para el robot,  la representación de un camino, básicamente está compuesta de...

  8. Implementación de la principal referencia metaheurística de Optimización Multiobjetivo NSGA-II aplicada a la Filogenética Computacional

    Zambrano Vega, Cristian Gabriel
    Uno de los problemas más importantes en la Bioinformática y la Biología Computacional es la búsqueda y reconstrucción de árboles filogenéticos, que describan, lo más realmente posible, la evolución de las especies.La Inferencia filogenética es considerada como un problema de complejidad NP-completo por la exploración del espacio de búsqueda conformado por todas las posibles topologías existentes según el número de especies en análisis, cuyo tamaño incrementa exponencialmente por cada una de ellas, convirtiéndolo en un caso de estudio para ser abordado con técnicas metaheurísticas. El problema de la inferencia filogenética se puede formular en base a dos objetivos a optimizar...

  9. Análisis de rendimiento de una propuesta algorítmica basada en la búsqueda local multiobjetivo MOLS

    Cedeño Muñoz, Joel Alberto
    En este artículo se presenta una propuesta algorítmica basada en la búsqueda local multiobjetivo (Multiobjective Local Search MOLS) y se lleva a cabo un estudio comparativo de su rendimiento frente a dos algoritmos clásicos en el área: NonDominated Sorting Genetic Algorithm-II (NSGA-II) y Pareto Archived Evolution Strategy (PAES), seleccionados como punto de comparación, el primero, por ser la principal referencia en el campo de la optimización multiobjetivo y el segundo por emplear una búsqueda local similar a la propuesta.El objetivo es conocer cuán competitivas pueden ser las metaheurísticas basadas en métodos de trayectorias para resolver problemas de optimización multiobjetivo (MOPs)...

  10. Panel of informative SNP markers for two genetic lines of European bison: Lowland and Lowland–Caucasian

    Wojciechowska, Marlena; Nowak, Zuzanna; Gurgul, Artur; Olech, Wanda; Drobik, Wioleta; Szmatoła, Tomasz
    As the result of a population bottleneck, the present living population of European bison shows a high level of inbreeding, and a significant loss of genetic variability. In studies on such specific species there is a need to apply methods that obtain as much information about the genome as possible in a short time. The aim of the study was to define a panel of SNP (Single Nucleotide Polymorphism) markers that could serve in genetic diversity analysis of European bison from two lines: Lowland (LB) and Lowland–Caucasian (LC). The study used 57 individuals from the LB line and 72 from...

  11. Genetic predisposition to breast cancer occuring in a male-to-female transsexual patient

    Potorac, Iulia; CORMAN, Vinciane; Manto, Florence; Dassy, Sarah; SEGERS, Karin; THIRY, Albert; Bours, Vincent; Daly, Adrian; Beckers, Albert

  12. Genetic multi criteria optimization for existing buildings holistic retrofit

    Rivallain, Mathieu; BAVEREL, Olivier; Peuportier, Bruno
    International audience

  13. Special Issue of Social Cognitive and Affective Neuroscience (December, 2006) Genetic, Comparative and Cognitive Studies of Social Behavior

    Adolphs, Ralph; Skuse, David
    [no abstract]

  14. Genetic evidence for a worldwide chaotic dispersion pattern of the arbovirus vector, Aedes albopictus.

    Manni, Mosè; Guglielmino, Carmela R; Scolari, Francesca; Vega-Rúa, Anubis; Failloux, Anna-Bella; Somboon, Pradya; Lisa, Antonella; Savini, Grazia; Bonizzoni, Mariangela; Gomulski, Ludvik M; Malacrida, Anna R; Gasperi, Giuliano
    International audience

  15. Genetic Algorithm Application for Enhancing State-Sensitivity Partitioning

    Sultan, Ammar,; Baharom, Salmi; Ghani, Abdul,; Din, Jamilah; Zulzalil, Hazura
    Part 6: Short Papers

  16. Cell Based Fair Resource Allocation in Fixed Clustered Cellular Systems Using a Genetic Algorithm

    Majid, Muhammad I.; Imran, Muhammad A.; Hoshyar, Reza
    In this paper we consider the uplink of a cellular network partitioned into localized jointly decoded cells. These jointly decoded cells are implemented as fixed size clusters. Such networks have a potential for real world deployments with improved spectral efficiency and user experience. Similar to conventional cellular networks, frequency planning can be considered as an efficient method to control interference between cells belonging to different clusters. Here we consider frequency planning in the form of allocating set of frequency bins to cells within clusters. As service providers are more interested in providing QoS, the considered bin allocation apart from maximizing system throughput, should also allocate cell resources in a fair manner. We...

  17. Optimization of the Painting Problem by a Genetic Approach using Interval-values

    Zámbó Lajos; Nagy Benedek (1973-) (informatikus, matematikus)

  18. Science and Engineering Ethics Enters its Third Decade

    Spier, Raymond E.; Bird, Stephanie J
    During the last 20 years public discourse in the developed and developing worlds has changed radically. The terms “ethics”, “morals”, “rights”, “safety”, “privacy”, “media”, “genetic engineering”, “information technology”, “big data”, “robots”, “satellites”, “environment”, “climate”, “fracking”, and “security” have loomed large and are set to grow larger. How do these concerns, topics and technological developments affect the way people will think and behave in the years ahead?

  19. Description of a new epibiotic relationship(Suctorian– Copepoda) in NE Atlantic waters:frommorphological to phylogenetic analyses

    Gregori, María; Fernández Leborans, Gregorio; Roura, Álvaro; González, Ángel F.; Pascual, Santiago
    Paraeuchaeta hebes is one of the most important carnivorous copepods in thecoastal upwelling system off Galician waters (Ría de Vigo,NEAtlantic).Asuc-torian epibiont of the genus Pelagacineta was found attached to the surface ofthese copepods. The abundance and distribution on the copepod surface wereanalysed, taking into account the sex of the crustacea n, revealing some prefer-ence for females and also a different attachment point in both sexes. The mor-phological study allowed us to identify a new species of this Suctoria epibiont asPelagacineta hebensis. Moreover, the 18S rRNA gene was partially sequenced toinspect the phylogenetic position of Pelagacineta hebensis within the subclassPhyllopharyngea. The...

  20. CYP24A1 variant modifies the association between use of oestrogen plus progestogen therapy and colorectal cancer risk

    Garcia-Albeniz, Xabier; Rudolph, Anja; Hutter, Carolyn; White, Emily; Lin, Yi; Rosse, Stephanie A; Figueiredo, Jane C; Harrison, Tabitha A; Jiao, Shuo; Brenner, Hermann; Casey, Graham; Hudson, Thomas J; Thornquist, Mark; Le Marchand, Loic; Potter, John; Slattery, Martha L; Zanke, Brent; Baron, John A; Caan, Bette J; Chanock, Stephen J; Berndt, Sonja I; Stelling, Deanna; Fuchs, Charles S; Hoffmeister, Michael; Butterbach, Katja; Du, Mengmeng; James Gauderman, W; Gunter, Marc J; Lemire, Mathieu; Ogino, Shuji; Lin, Jennifer; Hayes, Richard B; Haile, Robert W; Schoen, Robert E; Warnick, Greg S; Jenkins, Mark A; Thibodeau, Stephen N; Schumacher, Fredrick R; Lindor, Noralane M; Kolonel, Laurence N; Hopper, John L; Gong, Jian; Seminara, Daniela; Pflugeisen, Bethann M; Ulrich, Cornelia M; Qu, Conghui; Duggan, David; Cotterchio, Michelle; Campbell, Peter T; Carlson, Christopher S; Newcomb, Polly A; Giovannucci, Edward; Hsu, Li; Chan, Andrew T; Peters, Ulrike; Chang-Claude, Jenny
    Background: Menopausal hormone therapy (MHT) use has been consistently associated with a decreased risk of colorectal cancer (CRC) in women. Our aim was to use a genome-wide gene–environment interaction analysis to identify genetic modifiers of CRC risk associated with use of MHT. Methods: We included 10 835 postmenopausal women (5419 cases and 5416 controls) from 10 studies. We evaluated use of any MHT, oestrogen-only (E-only) and combined oestrogen–progestogen (E+P) hormone preparations. To test for multiplicative interactions, we applied the empirical Bayes (EB) test as well as the Wald test in conventional case–control logistic regression as primary tests. The Cocktail test...

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