534 research outputs found
Análisis de los suelos del piedemoente de la vertiente norte de la Sierra de Alhama (Granada, España)
[Resumen] El piedemonte que enlaza la sierra de Alhama y el poljé de Zafarraya puede considerarse como un glacis incipiente sobre el que desarrollan suelos cuya morfología es heredada del material parental. Los suelos son mayoritariamente Gleysoles y Regosoles, con o sin carbonatos, arcillosos y de fuerte consistencia, motivo que asociado al relieve justifica el alto índice de erosionabilidad y el que exijan un serio acondicionamiento para ser usado agricolamente. Dada la posición fisiográfica y la propia naturaleza edáfica, también se utiliza el terreno para almacenar agua de lluvia destinada a riego. En cuanto a la génesis, son suelos poco Desarrolla dos y el hecho evolutivo más significativo es la transformación de la arcilla heredada (ilita-interestratificados-esmectita).[Abstract] The footslope in between Alhama mountain rouge and Zafarraya polje could be considered as an incipient glacis which shows soil with an inherited morphology from the parent material developing over it. Soils are mainly Gleysols and Regosols, with or without carbonates, clayed and with a strong consistence; these characteristics asociated to relief are the justification of the high erodibility index and the excigence of a serious arranging to be farmerly used. With the fisiographic position and own edaphic nature given, even the land use could be in order to store rainfall water for irrigation. For genetical studies, these are low developed soils and the most significant thing in their evolution is the inherated clay transformation (illite-interstratified-smectite)
An XMM-Newton view of FeK{\alpha} in HMXBs
We present a comprehensive analysis of the whole sample of available
XMM-Newton observations of High Mass X-ray Binaries (HMXBs) until August, 2013,
focusing on the FeK{\alpha} emission line. This line is a key tool to better
understand the physical properties of the material surrounding the X-ray source
within a few stellar radii (the circumstellar medium). We have collected
observations from 46 HMXBs, detecting FeK{\alpha} in 21 of them. We have used
the standard classification of HMXBs to divide the sample in different groups.
We find that: (1) FeK{\alpha} is centred at a mean value of 6.42 keV.
Considering the instrumental and fits uncertainties, this value is compatible
with ionization states lower than FeXVIII. (2) The flux of the continuum is
well correlated with the flux of the line, as expected. Eclipse observations
show that the Fe fluorescence emission comes from an extended region
surrounding the X-ray source. (3) FeK{\alpha} is narrow (width lower than
0.15keV), reflecting that the reprocessing material does not move at high
speeds. We attempt to explain the broadness of the line in terms of three
possible broadening phenomena: line blending, Compton scattering and Doppler
shifts (with velocities of the reprocessing material V=1000-2000 km/s). (4) The
equivalent hydrogen column (NH) directly correlates with the EW of FeK{\alpha},
displaying clear similarities to numerical simulations. It highlights the
strong link between the absorbing and the fluorescent matter. The obtained
results clearly point to a very important contribution of the donors wind in
the FeK{\alpha} emission and the absorption when the donor is a supergiant
massive star.Comment: Accepted for publication in A&A. 13 pages, 16 figures + Appendice
First helminthological data on the Iberian adder, Vipera seoanei.
The helminth fauna present in the gut contents of Iberian adders, Vipera seoanei (Squamata: Viperidae), were characterised and analysed in respect to biological and eco-geographic factors that may affect the occurrence and diversity of helminths in this species. A total of 317 samples of preserved stomachs and intestines, covering the distributional range of V. seoanei, were examined. Similar to other Vipera species from the Iberian Peninsula, the helminth fauna was also impoverished in V. seoanei, but unlike other Vipera species from Central and East Europe, helminths were mostly found in adult vipers, and occurred in vipers located at the periphery of the species range, characterised by low elevation, high temperature and precipitation levels, and abundant pastures
Estudio científico de los tubos sonoros de metal del órgano Francisco Pérez de Valladolid (S.XVIII). Alcalá de los Gazules (Cádiz)
Mating modifies the expression of crucial oxidative-reductive transcripts in the pig oviductal sperm reservoir: is the female ensuring sperm survival?
BackgroundMating induces large changes in the female genital tract, warranting female homeostasis and immune preparation for pregnancy, including the preservation of crucial oxidative status among its pathways. Being highly susceptible to oxidative stress, sperm survival and preserved function depend on the seminal plasma, a protection that is removed during sperm handling but also after mating when spermatozoa enter the oviduct. Therefore, it is pertinent to consider that the female sperm reservoir takes up this protection, providing a suitable environment for sperm viability. These aspects have not been explored despite the increasing strategies in modulating the female status through diet control and nutritional supplementation.AimsTo test the hypothesis that mating modifies the expression of crucial oxidative-reductive transcripts across the entire pig female genital tract (cervix to infundibulum) and, particularly in the sperm reservoir at the utero-tubal junction, before ovulation, a period dominated by estrogen stimulation of ovarian as well as of seminal origin.MethodsThe differential expression of estrogen (ER) and progesterone (PR) receptors and of 59 oxidative-reductive transcripts were studied using a species-specific microarray platform, in specific segments of the peri-ovulatory sow reproductive tract in response to mating.ResultsMating induced changes along the entire tract, with a conspicuous downregulation of both ER and PR and an upregulation of superoxide dismutase 1 (SOD1), glutaredoxin (GLRX3), and peroxiredoxin 1 and 3 (PRDX1, PRDX3), among other NADH Dehydrogenase Ubiquinone Flavoproteins, in the distal uterus segment. These changes perhaps helped prevent oxidative stress in the area adjacent to the sperm reservoir at the utero-tubal junction. Concomitantly, there were a downregulation of catalase (CAT) and NADH dehydrogenase (ubiquinone) oxidoreductases 1 beta subcomplex, subunit 1 (NDUFB1) in the utero-tubal junction alongside an overall downregulation of CAT, SOD1, and PRDX3 in the ampullar and infundibulum segments.ConclusionsNatural mating is an inducer of changes in the expression of female genes commanding antioxidant enzymes relevant for sperm survival during sperm transport, under predominant estrogen influence through the bloodstream and semen. The findings could contribute to the design of new therapeutics for the female to improve oxidative-reductive balance
LA COMUNICACIÓN DENTRO DE LAS RELACIONES PÚBLICAS EN EL SECTOR TURÍSTICO / THE COMMUNICATION INSIDE THE PUBLIC RELATIONSHIPS IN THE TOURIST SECTOR
La comunicación en el sector turístico es de vital importancia para el desarrollo eficiente de los procesos; sin embargo algunos representantes de las relaciones públicas poseen limitaciones teóricas y prácticas para priorizar la comunicación como medio indispensable en la representación de la imagen y los intereses de la entidad turística, por lo que se realiza una investigación exploratoria en la que a partir de la observación durante la práctica laboral, la revisión bibliográfica y la entrevista, se concibe una propuesta de autoevaluación para determinar si se es o no un buen receptor y/o emisor. Se declara como objetivo del artículo: valorar la importancia de la comunicación dentro de las Relaciones Públicas en el sector turístico a partir de las características que debe poseer un buen comunicador
Delta rho pi interaction leading to N* and Delta* resonances
We have performed a calculation for the three body system
by using the fixed center approximation to Faddeev equations, taking the
interaction between and , and, and and
from the chiral unitary approach. We find several peaks in the modulus
squared of the three-body scattering amplitude, indicating the existence of
resonances, which can be associated to known and and baryon states.Comment: Presented at the 21st European Conference on Few-Body Problems in
Physics, Salamanca, Spain, 30 August - 3 September 201
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