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Nomenclatura Unesco > (24) Ciencias de la Vida > (2409) Genética
(2409.01) Embriología (2409.02) Ingeniería genética
(2409.03) Genética de poblaciones (2409.90) Citogenética animal
(2409.91) Genética del desarrollo (2409.92) Genética molecular de plantas
(2409.93) Genética molecular (2409.94) Genética molecular de levaduras
(2409.99) Otras (especificar)

Categorías relacionadas:
(3201.02) Genética clínica (2410.07) Genética humana
(2407.02) Citogenética

Mostrando recursos 1 - 20 de 214,431

1. Flexible Neural Trees Ensemble for Stock Index Modeling - Yuehui Chen; Bo Yang; Ajith Abraham
The use of intelligent systems for stock market predictions has been widely established. In this paper, we investigate how the seemingly chaotic behavior of stock markets could be well represented using Flexible Neural Tree (FNT) ensemble technique. We considered the Nasdaq-100 index of Nasdaq Stock Market and the S&P CNX NIFTY stock index. We analyzed 7-year Nasdaq-100 main index values and 4year NIFTY index values. This paper investigates the development of novel reliable and efficient techniques to model the seemingly chaotic behavior of stock markets. The structure and parameters of FNT are optimized using Genetic Programming (GP) like tree structure...

2. Flexible Neural Trees Ensemble for Stock Index Modeling - Yuehui Chen; Ju Yang; Bo Yang; Ajith Abraham
The use of intelligent systems for stock market predictions has been widely established. In this paper, we investigate how the seemingly chaotic behavior of stock markets could be well represented using Flexible Neural Tree (FNT) ensemble technique. To this end, we considered the Nasdaq-100 index of Nasdaq Stock Market and the S&P CNX NIFTY stock index. We analyzed 7-year Nasdaq-100 main index values and 4-year NIFTY index values. This paper investigates the development of novel reliable and efficient techniques to model the seemingly chaotic behavior of stock markets. The structure and parameters of FNT are optimized by using Genetic Programming...

3. Manejo clínico odontológico integral del paciente con síndrome de Sjögren: una propuesta - Sturla Rojas, G.; Romo Ormazábal, F.; Torres Quintana, M.A.
Sjögren´s syndrome (SS) is an autoimmune, chronic and inflammatory disease characterized by infiltration of plasma cells and lymphocytes in the exocrine glands. The pathogenesis of SS is related to immune, neurological, genetic, viral and hormonal factors. Complications are related to glandular destruction and mucosal dryness. The poor quality and quantity of saliva brings devastating consequences to dental and oral health. Alterations in the enamel structure, constant presence of caries in tooth surfaces exposed, mainly cervical, failures in the adhesion of filling materials, keratoses on the mucous membranes, burning mouth syndrome and discomfort in the use of dentures, despite the exhaustive management of the oral environment, are...

4. Caso problema: retardo mental como secuela de enfermedad neurometabólica - Vallejo Ardila, Dora Lucía; Rangel Díaz, Yully Andrea; Villamizar, María Constanza
Los errores innatos del metabolismo representan un grupo paradigmático en el contexto de las enfermedades poco conocidas, aunque son más de 500 perfectamente definidas. Gracias a los avances de la biología molecular y la bioquímica, muchas de estas enfermedades no caracterizadas se han ido adicionando al grupo de errores innatos del metabolismo. El conocimiento de las bases moleculares de estas patologías, ha mejorado las posibilidades de diagnóstico prenatal y neonatal en la población a riesgo, lo que permite la posibilidad de implementar programas de manejo preventivo, así como, la aplicación del tratamiento y un consejo genético precoz. Se reporta el...

5. Melanoma maligno cutáneo en una mujer indígena del municipio de Alto Baudó, Chocó, Colombia - Moya Peñafiel, Mervin José
El melanoma maligno cutáneo es una enfermedad mortal, que durante los últimos años se ha propagado a nivel mundial, es una entidad que afecta la piel y los órganos que se originan de la cresta neural durante el desarrollo embrionario. La historia del melanoma, se resume en el crecimiento e invasión local de la piel, y en el desarrollo de la misma, influyen factores tanto ambientales como genéticos. Esta patología es infrecuente en tipos de raza, como los afrodescendientes e indígenas, por tanto, debido a este particular suceso, el objetivo del presente artículo, es demostrar a través de un estudio...

6. Estrategias para el entrenamiento de redes neuronales de números difusos - Villarreal López, Edwin; Arango Parrado, Daniel Alejandro
The purpose of this article is to present general training strategies for training fuzzy number neural networks used in the learning of systems from linguistic data. We shortly analyze the main trends in the training of this kind of systems and from that point, we propose new strategies. The first of them is based on the backpropagation of the mean square error in all the a-cuts for crisp weights. The second strategy uses a real codification genetic algorithm for crisp weights networks. The third is based in the backpropagation of the mean error value and the ambiguity of all the...

7. Power factor corrector with PID loop fit by genetic algorithm - Martínez Sarmiento, Fredy Hernán; Jacinto Gómez, Edwar; Castiblanco Ortíz, Mariela
The boost converter is widely used in voltage regulation applications and active power factor correction (PFC), its proper operation and performance are directly related to final design of its control loop. The design of this control is somewhat complex due to the nonlinearity of its behavior; the commutation of a switch (power transistor) makes the equivalent circuit change continually over time (two alternating circuits in time). In this work, it is defined the poles of the transfer function in closed loop for the average model (linear model approximate) of the boost converter using evolutionary principles of genetic algorithms, with the...

8. Transmission planning considering security and demand uncertainty through non-linear programming and evolutionary techniques - Bolaños Ocampo, Ricardo Andrés; Correa Flórez, Carlos Adrián
This paper proposes a methodology for solving the Transmission Expansion Planning Problem considering single contingencies (N-1) and future demand uncertainty. To solve this problem, a specialized Chu-Beasley Genetic Algorithm (CBGA) is used so that investment plans can be suggested. These plans are evaluated through a Higher Order Interior Point Method for Linear Programming or through a Predictor Corrector Method. Addition­ally, initialization of the CBGA is carried out us­ing Non-linear Interior Point. The methodology is validated using three test systems from the spe­cialized literature: 46-Bus South-Brazilian, IEEE 24-Bus, and a 6-Bus Garver system. Results dem­onstrate the validity of this approach to...

9. Current strategies in the search for low penetrance genes in cancer - Benítez, Javier
The genetic etiology of most cancers remains largely unclear and it has been hypothesised that common genetic variants with modest effects on disease susceptibility cause the bulk of this unexplained risk. Case-control association studies are considered the most effective strategy to identify these low-penetrance genes. While traditionally, such studies have focused on putative functional single nucleotide polymorphisms (SNPs) in candidate genes, a more comprehensive approach can now be taken, as a result of a number of recent developments: the mapping of the human genome, including the identification of almost ten million SNPs; and the development of high-throughput genotyping technologies that...

10. Genetic parameters for individual birth weight, weaning weight and final weight of crossbred pigs from Piétrain boars - Dufrasne, Marie; Wavreille, José; Piedboeuf, Maureen; Gengler, Nicolas
Genetic parameters for birth weight (BWT), weaning weight (WWT), and final weight (BW) were estimated for crossbred pigs from Piétrain boars raised in test station. Estimates of direct heritability were moderate (0.25 to 0.42), suggesting that genetic improvement of growth would be possible. Estimates of maternal heritability were 0.24 for BWT and WWT, and 0.05 for BW, indicating that the genetic influence of the dam on growth was not negligible until weaning. Genetic correlations between direct and maternal effects for BWT and WWT were moderate and unfavorable (-0.52 and -0.57 respectively). Direct genetic correlations were high and favorable between traits (0.40 to 0.75), suggesting that a high BWT is a good predictor...

11. Genetic parameters for individual birth weight, weaning weight and final weight of crossbred pigs from Piétrain boars - Dufrasne, Marie; Wavreille, José; Piedboeuf, Maureen; Gengler, Nicolas
Peer reviewed

12. Contribuições para a oftalmologia descritiva de animais domésticos e selvagens - Almeida, Ana Carolina da Veiga Rodarte de
Resumo: A presente tese de doutorado buscou contribuir com a oftalmologia clínica, histopatológica e investigativa de animais domésticos e selvagens. Para tanto o trabalho foi dividido em quatro capítulos. O primeiro capítulo é uma breve introdução salientando a importância do estudo fenotípico e genotípico das doenças generalizadas da retina em cães e o reflexo destas pesquisas na oftalmologia comparada. Neste capítulo serão justificados os capítulos seguintes da tese, abrangendo inclusive a importância do estudo fenotípico e histopatológico da displasia de retina canina. Por fim, na introdução cita-se o que será abordado no estudo oftálmico descritivo sobre aves de rapina, mais...

13. Análise da frequencia de polimorfismos dos genes GSTT1 e GSTM1 em mostra da populaçao negróide do sul do Brasil - Oliveira, Fausto Koga de

14. Melhoramento genético e silvicultural de Cedrela fissilis vell. - Cusatis, Andrea Chizzotti
Resumo: Cedrela fissilis Vell., cedro-rosa, esteve entre as três principais espécies madeireiras do neotrópico em função de seu alto valor comercial que gerou renda a economias locais e nacionais. A silvicultura da espécie encontra desafios como os danos provocados por Hypsipyla grandella e a susceptibilidade à geada, na Região Sul do Brasil. O melhoramento genético e a compreensão da autoecologia de C. fissilis em Floresta Obrófila Mista podem contribuir à superação destes problemas e, consequentemente, à sua domesticação. O objetivo deste trabalho foi analisar a variabilidade genética, selecionar genótipos superiores quanto à sobrevivência e crescimento e propor diretrizes para o...

15. El banco genético en peligro - González, Henry

16. Parental care, loss of paternity and circulating levels of testosterone and corticosterone in a socially monogamous song bird - Villavicencio, Camila P; Apfelbeck, Beate; Goymann, Wolfgang
Introduction: In biparental birds testosterone levels of males are typically high during the mating phase and decrease during the parental phase. Testosterone implants may enhance mating behaviors, increase the likelihood of males to engage in extra-pair mating behavior and may reduce paternal care. Thus, sex steroids such as testosterone influence reproductive behaviors. Little is known, however, as to whether the more subtle differences in physiological concentrations of testosterone that occur between individuals are related to differences in paternal care, extra-pair behavior, and genetic paternity between those males. Here, we investigate these relationships in the male black redstart (Phoenicurus ochruros), a socially...

17. Genetics and hypertension: which information for clinical practice - Padmanabhan, Sandosh; Dominiczak, Anna F.
Essential hypertension is a complex genetic disease determined by multiple biological pathways and influenced by both genetic and environmental factors. The high prevalence of hypertension, with its major impact on morbidity and mortality, results in a significant health and financial burden on the individual and on society. Genetic insights from monogenic syndromes and genome-wide association studies have advanced our understanding of biological pathways underlying interindividual variation in blood pressure. In this chapter, we describe the genetic basis of blood pressure and hypertension with the implications of these in current clinical practice.

18. Behavioural syndromes in juvenile brown trout (Salmo trutta); life history, family variation and performance in the wild - Höjesjö, Johan; Adriaenssens, Bart; Bohlin, Torgny; Jönsson, Christopher; Hellström, Illka; Johnsson, Jörgen I.
The main aims of this study were to investigate (1) the occurrence and strength of the shyness–boldness behavioural syndrome in brown trout fry, (2) whether this syndrome is associated with paternal migratory life history, (3) whether fry survival and growth in the wild is associated with paternal life history and/or boldness and (4) whether offspring performance showed maternal effects. Nine female migratory trout were each crossed with one migratory and one resident male and the offspring were raised in hatchery tanks until first feeding. The behavioural studies showed that fry that responded bold towards a novel object also accepted a...

19. Increased FADS2-derived n-6 PUFAs and reduced n-3 PUFAs in plasma of atopic dermatitis patients - Mihály, Johanna; Marosvölgyi, Tamás; Szegedi, Andrea; Köröskényi, Krisztina; Lucas, Renata; Törocsik, Dániel; Garcia, Ada L.; Decsi, Tamás; Rühl, Ralph
Fatty acid concentrations, in particular n-3 and n-6 polyunsaturated fatty acids (PUFAs), have been described to be dysregulated in atopic dermatitis (AD) patients. The role of genetic polymorphisms of fatty acid enzymes in AD is controversial. We determined in a Hungarian cohort of healthy volunteers (n = 20) and AD patients (n = 20) triglyceride-, sterol- and phospholipid-bound fatty acids in the plasma, mRNA expression of fatty acid desaturase 2 (FADS2) and stearoyl-coenzyme A desaturase 1 in peripheral blood mononuclear cells (PBMCs) and FADS2 concentrations in plasma. We observed higher levels of monounsaturated fatty acids, 16:1 versus 16:0 ratios in...

20. Expression of Bcl-2 and MIB-1 Markers in Oral Squamous Cell Carcinoma (OSCC)- A Comparative Study - Garewal, Jessica; Garewal, Ripin; Sircar, Keya
Background: Neoplasia results from various genetic and epigenetic factors. Our study focused on the pathogenesis which involved an imbalance in various molecular mechanisms which regulated cell proliferation and apoptosis. The anti-apoptotic mechanism is regulated by Bcl-2 gene, while Ki-67 is expressed exclusively in nuclei of proliferating cells. This study was done to evaluate the basic pathologic process which underlay well and poorly differentiated oral squamous cell carcinoma (OSCC).

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