Nonmesonic weak decay of Λ hypernuclei: The three-nucleon induced mode

The nonmesonic weak decay of 3hypernuclei is studied within a microscopic diagrammatic approach which is extended to include the three-nucleon induced mechanism. We adopt a nuclear matter formalism which, through the local density approximation, allows us to model finite hypernuclei, a one-meson-exchange weak transition potential and a Bonn nucleon–nucleon strong potential. One-, two-and three-nucleon induced weak decay rates are predicted for 123Cby including ground state correlations up to second order in the nucleon–nucleon potential and the recoil of the residual nucleus. Three-nucleon stimulated decays, 3NNN→nNNN(N=nor p), are considered here for the first time. The obtained decay rates compare well with the latest KEK and FINUDA data. The three-nucleon induced rate turns out to be dominated by nnp-and npp-induced decays, it amounts to ∼7%of the total nonmesonic rate and it is ∼1/2of the neutron-induced decay rate. The reduction effect of the nuclear recoil is particularly relevant for the three-nucleon induced rates (∼15%), less important for the two-nucleon induced rates (∼4%) and negligible for the one-nucleon induced rates. Given the non-negligible size of the three-nucleon induced contribution and consequently its importance in the precise determination of the complete set of decay rates, new measurements and/or experimental analysis are encouraged.Facultad de Ciencias Astronómicas y Geofísica

Classifying BCI signals from novice users with Extreme Learning Machine

Volume 15, Issue 1 Previous ArticleNext Article Classifying BCI signals from novice users with extreme learning machine Germán Rodríguez-Bermúdez / Andrés Bueno-Crespo / F. José Martinez-Albaladejo Published Online: 2017-07-07 | DOI: https://doi.org/10.1515/phys-2017-0056 OPEN ACCESS DOWNLOAD PDF Abstract Brain computer interface (BCI) allows to control external devices only with the electrical activity of the brain. In order to improve the system, several approaches have been proposed. However it is usual to test algorithms with standard BCI signals from experts users or from repositories available on Internet. In this work, extreme learning machine (ELM) has been tested with signals from 5 novel users to compare with standard classification algorithms. Experimental results show that ELM is a suitable method to classify electroencephalogram signals from novice users.Ingeniería, Industria y Construcció

Population History and Gene Divergence in Native Mexicans Inferred from 76 Human Exomes.

Native American genetic variation remains underrepresented in most catalogs of human genome sequencing data. Previous genotyping efforts have revealed that Mexico's Indigenous population is highly differentiated and substructured, thus potentially harboring higher proportions of private genetic variants of functional and biomedical relevance. Here we have targeted the coding fraction of the genome and characterized its full site frequency spectrum by sequencing 76 exomes from five Indigenous populations across Mexico. Using diffusion approximations, we modeled the demographic history of Indigenous populations from Mexico with northern and southern ethnic groups splitting 7.2 KYA and subsequently diverging locally 6.5 and 5.7 KYA, respectively. Selection scans for positive selection revealed BCL2L13 and KBTBD8 genes as potential candidates for adaptive evolution in Rarámuris and Triquis, respectively. BCL2L13 is highly expressed in skeletal muscle and could be related to physical endurance, a well-known phenotype of the northern Mexico Rarámuri. The KBTBD8 gene has been associated with idiopathic short stature and we found it to be highly differentiated in Triqui, a southern Indigenous group from Oaxaca whose height is extremely low compared to other Native populations

Evolución costera de la desembocadura del Guadalquivir en los últimos 6000 años (SW de España)

3 páginas, 2 figuras, 5 referencias.Since the last Holocene sea level rise, about 6,900 yr BP, a series of depositional littoral landforms has been generated at the outlet of the Guadalquivir river, with progradation along the predominant longshore drift (towards the east). The littoral spit systems mapped constitute fur progradation phases. The first is dated between the Flandrian maximum (6,900 yr BP) and 4,500 yr BP; the second between 4,200-3,900 yr BP and 2,700-2,600 yr BP; the third between 2,300 yr BP and 1,100 yr BP; and the fourth between 1,000 yr BP and the present. There were separations of successive erosional phases between 4,500-4,200 yr BP, 2,600-2,300 yr BP and, 1,100-1,000 yr BP. Thus, cycles of higher sedimentation are established, with a slight fall and then stability of sea level. Littoral barrier constructions dominate, with the genesis of extensive tidal flats that decrease the size of the estuaries. These sedimentary phases are interrupted by rapid rises in sea level lasting from 100 to 300 years, when the previously constructed littoral barriers are eroded. The cliffs retreat, causing migration inland of dunar constructions, with frequent overlapping layers. Marine influence within the estuaries in creases.Este trabajo ha sido subvencionado por los proyectos coordinados de la DGICYT PB91-0622-C03-0 1 y PB94-1090-C03-0l. Es una contribución al IGCP-367.Peer reviewe

Encapsulation of probiotics for food applications

Los alimentos funcionales contienen componentes activos que con un consumo habitual favorecen la salud de consumidor. Dentro del concepto de funcional se encuentran los alimentos con microorganismos probióticos, los cuales al ser ingeridos en dosis adecuadas confieren diversos beneficios, estos microorganismos son sensibles a factores tecnológicos y ambientales que pueden reducir su viabilidad, estabilidad y su capacidad funcional. Existen tecnologías como la encapsulación, las cuales permiten mejorar la estabilidad de los probióticos al protegerlos mediante un material de recubrimiento. En este trabajo se realizó una búsqueda sistemática en diversas bases de datos sobre los probióticos más empleados en la industria de alimentos, su capacidad catalítica en matrices alimenticias, métodos de encapsulación, tipos de matrices en la encapsulación, estabilidad bajo condiciones gastrointestinales y los mecanismos de liberación. Se encontró que la encapsulación, además de favorecer la estabilidad de los microorganismos probióticos frente a factores adversos, condiciona según sus características, su aplicación e incorporación en matrices alimenticias de diversas cualidades.Functional foods contain active components, which under their regular use favor consumers’ health. Within the functional concept food with probiotics are found, which when ingested in adequate doses confer various benefits. These microorganisms are sensitive to technological and environmental factors that can reduce their viability, stability, and functional capacity. There are some technologies such as encapsulation, which allow improving the stability of probiotics by protecting them with a coating material. This a systematic search in several databases on the most widely used probiotics in the food industry, their catalytic capacity in food matrices, encapsulation methods, types of matrices in encapsulation, stability in gastrointestinal conditions and release mechanisms. It was found that encapsulation, besides favoring the stability of probiotic microorganisms against adverse factors, conditions, according to their characteristics, their application and incorporation in food matrices of different qualities

Nonmesonic weak decay of Λ hypernuclei: The three-nucleon induced mode

The nonmesonic weak decay of 3hypernuclei is studied within a microscopic diagrammatic approach which is extended to include the three-nucleon induced mechanism. We adopt a nuclear matter formalism which, through the local density approximation, allows us to model finite hypernuclei, a one-meson-exchange weak transition potential and a Bonn nucleon–nucleon strong potential. One-, two-and three-nucleon induced weak decay rates are predicted for 123Cby including ground state correlations up to second order in the nucleon–nucleon potential and the recoil of the residual nucleus. Three-nucleon stimulated decays, 3NNN→nNNN(N=nor p), are considered here for the first time. The obtained decay rates compare well with the latest KEK and FINUDA data. The three-nucleon induced rate turns out to be dominated by nnp-and npp-induced decays, it amounts to ∼7%of the total nonmesonic rate and it is ∼1/2of the neutron-induced decay rate. The reduction effect of the nuclear recoil is particularly relevant for the three-nucleon induced rates (∼15%), less important for the two-nucleon induced rates (∼4%) and negligible for the one-nucleon induced rates. Given the non-negligible size of the three-nucleon induced contribution and consequently its importance in the precise determination of the complete set of decay rates, new measurements and/or experimental analysis are encouraged.Facultad de Ciencias Astronómicas y Geofísica