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Search Results: 1 - 10 of 29990 matches for " Yolanda Rodríguez-Gil "
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Ischemic colitis associated with hormonal contraceptive treatment delivered via vaginal ring Colitis isquémica asociada con el tratamiento hormonal anticonceptivo administrado mediante un anillo intravaginal
Pablo Solís-Mu?oz,M. Teresa Mu?oz-Yagüe,Yolanda Rodríguez-Gil,Francisco Colina
Revista Espa?ola de Enfermedades Digestivas , 2013,
Binarity and the abundance discrepancy problem in planetary nebulae
Romano Corradi,Jorge García-Rojas,David Jones,Pablo Rodríguez-Gil
Physics , 2015, DOI: 10.1088/0004-637X/803/2/99
Abstract: The discrepancy between abundances computed using optical recombination lines (ORLs) and collisionally excited lines (CELs) is a major unresolved problem in nebular astrophysics. We show here that the largest abundance discrepancies are reached in planetary nebulae with close binary central stars. This is illustrated by deep spectroscopy of three nebulae with a post common-envelope (CE) binary star. Abell 46 and Ou5 have O++/H+ abundance discrepancy factors larger than 50, and as high as 300 in the inner regions of Abell 46. Abell 63 has a smaller discrepancy factor around 10, but still above the typical values in ionized nebulae. Our spectroscopic analysis supports previous conclusions that, in addition to "standard" hot (Te~10000 K) gas, a colder (Te~1000 K) ionized component that is highly enriched in heavy elements also exists. These nebulae have low ionized masses, between 0.001 and 0.1 solar masses depending on the adopted electron densities and temperatures. Since the much more massive red-giant envelope is expected to be entirely ejected in the CE phase, the currently observed nebulae would be produced much later, in post-CE mass loss episodes when the envelope has already dispersed. These observations add constraints to the abundance discrepancy problem. Possible explanations are revised. Some are naturally linked to binarity, such as for instance high-metallicity nova ejecta, but it is difficult at this stage to depict an evolutionary scenario consistent with all the observed properties. The hypothesis that these nebulae are the result of tidal destruction, accretion and ejection of Jupiter-like planets is also introduced.
Agujero macular y síndrome de Alport Macular hole and Alport's syndrome
R. Rodríguez-Gil,M.A. Gil-Hernández,A. Afonso-Rodríguez
Archivos de la Sociedad Espa?ola de Oftalmología , 2012, DOI: 10.1016/j.oftal.2011.10.011
Abstract: Casos clínicos: Se presentan los casos clínicos de dos varones de 38 y 39 a os, diagnosticados de síndrome de Alport, que presentaron respectivamente un agujero macular bilateral y un agujero unilateral gigante con adelgazamiento retiniano en el otro ojo. Discusión: El síndrome de Alport es un desorden genético caracterizado por la mutación de genes que codifican el colágeno tipo IV, principal componente de la membrana limitante interna, estructura identificada en el complejo membrana basal del epitelio pigmentario de la retina-membrana de Brüch. Esta alteración puede condicionar la predisposición a la aparición de agujeros maculares. Case report: We present the clinical cases of two male patients of 38 and 39 years, diagnosed with Alport's syndrome, who suffered a bilateral macular hole and a giant unilateral macular hole with retinal thinning in the other eye, respectively. Discussion: Alport's syndrome is a genetic disorder characterised by mutation of genes encoding type IV collagen, the main component of the internal limiting membrane, a structure identified in basal membrane of the retinal pigment epithelium-Brüch's membrane complex. This alteration can influence the predisposition to macular holes.
The redshift and broad band spectral energy distribution of NRAO 150
J. A. Acosta-Pulido,I. Agudo,R. Barrena,C. Ramos Almeida,A. Manchado,P. Rodríguez-Gil
Physics , 2010, DOI: 10.1051/0004-6361/200913953
Abstract: Context. NRAO 150 is one of the brightest radio and mm AGN sources on the northern sky. It has been revealed as an interesting source where to study extreme relativistic jet phenomena. However, its cosmological distance has not been reported so far, because of its optical faintness produced by strong Galactic extinction. Aims. Aiming at measuring the redshift of NRAO 150, and hence to start making possible quantitative studies from the source. Methods. We have conducted spectroscopic and photometric observations of the source in the near-IR, as well as in the optical. Results. All such observations have been successful in detecting the source. The near-IR spectroscopic observations reveal strong H$\alpha$ and H$\beta$ emission lines from which the cosmological redshift of NRAO 150 ($z=1.517\pm0.002$) has been determined for the first time. We classify the source as a flat-spectrum radio-loud quasar, for which we estimate a large super-massive black-hole mass $\sim5\times 10^{9} \mathrm{M_\odot}$. After extinction correction, the new near-IR and optical data have revealed a high-luminosity continuum-emission excess in the optical (peaking at $\sim2000$\,\AA, rest frame) that we attribute to thermal emission from the accretion disk for which we estimate a high accretion rate, $\sim30$\,% of the Eddington limit. Conclusions. Comparison of these source properties, and its broad-band spectral-energy distribution, with those of Fermi blazars allow us to predict that NRAO 150 is among the most powerful blazars, and hence a high luminosity -although not detected yet- $\gamma$-ray emitter.
IPHAS J062746.41+014811.3: a deeply eclipsing intermediate polar
A. Aungwerojwit,B. T. G?nsicke,P. J. Wheatley,S. Pyrzas,B. Staels,T. Krajci,P. Rodríguez-Gil
Physics , 2012, DOI: 10.1088/0004-637X/758/2/79
Abstract: We present time-resolved photometry of a cataclysmic variable discovered in the Isaac Newton Telescope Photometric Halpha Survey of the northern galactic plane, IPHAS J062746.41+014811.3 and classify the system as the fourth deeply eclipsing intermediate polar known with an orbital period of Porb=8.16 h, and spin period of Pspin=2210 s. The system shows mild variations of its brightness, that appear to be accompanied by a change in the amplitude of the spin modulation at optical wavelengths, and a change in the morphology of the eclipse profile. The inferred magnetic moment of the white dwarf is mu_wd = 6-7 x 10^33 Gcm^3, and in this case IPHAS J0627 will either evolve into a short-period EX Hya-like intermediate polar with a large Pspin\Porb ratio, or, perhaps more likely, into a synchronised polar. Swift observations show that the system is an ultraviolet and X-ray source, with a hard X-ray spectrum that is consistent with those seen in other intermediate polars. The ultraviolet light curve shows orbital modulation and an eclipse, while the low signal-to-noise ratio X-ray light curve does not show a significant modulation on the spin period. The measured X-ray flux is about an order of magnitude lower than would be expected from scaling by the optical fluxes of well-known X-ray selected intermediate polars.
The low states of CVs at the upper edge of the period gap
P. Rodríguez-Gil,L. Schmidtobreick,K. S. Long,T. Shahbaz,B. T. G?nsicke,M. A. P. Torres
Physics , 2011,
Abstract: We review our knowledge of the origin and phenomenology of low states (also known as VY Scl states) in cataclysmic variables, making special emphasis on the cataclysmic variable population found just above the period gap. This orbital period range between approximately 3 and 4 hours is the preferred land for the elusive SW Sextantis stars, which are believed to be about to enter the gap when their donor stars become fully convective. Despite their main role in our understanding of the whole picture of cataclysmic variable evolution, the study of their component stars is almost impossible due to the extreme veiling brightness of the accretion disc during the high state. Here we present the first steps toward the characterisation of the white dwarfs and the donor stars in these VY Scl systems in the low state, and the discovery of sporadic accretion events and satellite emission lines like those observed in the AM Her systems in the low state, which are likely related to magnetic activity of the fast rotating secondary stars.
Purely intramedullary spinal cord primitive neuroectodermal tumor: case report and review of the literature
Otero-Rodríguez,A.; Hinojosa,J.; Esparza,J.; Mu?oz,M.J.; Iglesias,S.; Rodríguez-Gil,Y.; Ricoy,J.R.;
Neurocirugía , 2009, DOI: 10.4321/S1130-14732009000400007
Abstract: introduction. primitive neuroectodermal tumors (pnets) are malign neoplasms of the central nervous system which mainly locate in cerebellum (medulloblastoma). primary intraspinal pnets are rare. within this group, we have found ten cases of purely intramedullary pnets (ipnets). in this report, we describe a new ipnet case and review the literature about these infrequent intramedullary tumors. case report. a 17 month-old boy showed progressive decrease of motion in his lower extremities. spine magnetic resonance imaging revealed an intramedullary expansive lesion from t3 to t10. a near-total removal was performed. the pathological diagnosis was pnet. subsequent chemotherapy was recommended. six months after operation, holocord progression has occurred. conclusion. ipnets are uncommon tumors affecting children and young adults. they are characterized by recurrence, progression or intracranial dissemination. outcome is dismal: most patients die within two years in spite of surgical resection followed by radiotherapy and chemotherapy.
Tumor carcinoide gástrico solitario y anemia perniciosa: tratamiento mediante polipectomía endoscópica Solitary gastric carcinoid tumor and pernicious anaemia: Treatment by endoscopic polypectomy
M. Fernández-Ruiz,Y. Rodríguez-Gil,S. Sáenz-López,J. M. Guerra-Vales
Revista Espa?ola de Enfermedades Digestivas , 2008,
The Increase in Phosphorylation Levels of Serine Residues of Protein HSP70 during Holding Time at 17°C Is Concomitant with a Higher Cryotolerance of Boar Spermatozoa
Marc Yeste, Efrén Estrada, Maria-Montserat Rivera del álamo, Sergi Bonet, Teresa Rigau, Joan-Enric Rodríguez-Gil
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0090887
Abstract: Boar-sperm cryopreservation is not usually performed immediately after semen collection, but rather a holding time (HT) of 4 h–30 h at 17°C is spent before starting this procedure. Taking this into account, the aim of this study was to go further in-depth into the mechanisms underlying the improving effects of HT at 17°C on boar-sperm cryotolerance by evaluating the effects of two different HTs (3 h and 24 h) on overall boar-sperm function and survival before and after cryopreservation. Given that phospho/dephosphorylation mechanisms are of utmost importance in the overall regulation of sperm function, the phosphorylation levels of serine residues (pSer) in 30 different sperm proteins after a 3 h- or 24 h-HT period were also assessed. We found that a HT of 24 h contributed to a higher sperm resistance to freeze-thawing procedures, whereas mini-array protein analyses showed that a HT of 24 h induced a significant (P<0.05) increase in pSer (from 100.0±1.8 arbitrary units in HT 3 h to 150.2±5.1 arbitrary units in HT 24 h) of HSP70 and, to a lesser extent, in protein kinases GSK3 and total TRK and in the cell-cycle regulatory protein CDC2/CDK1. In the case of HSP70, this increase was confirmed through immunoprecipation analyses. Principal component and multiple regression analyses indicated that a component explaining a percentage of variance higher than 50% in sperm cryotolerance was significantly correlated with pSer levels in HSP70. In addition, from all the parameters evaluated before freeze-thawing, only pSer levels in HSP70 resulted to be able to predict sperm cryotolerance. In conclusion, our results suggest that boar spermatozoa modulate its function during HT, at least partially, by changes in pSer levels of proteins like HSP70, and this is related to a higher cryotolerance.
A dynamical study of the nova remnant of GK Per
T. Liimets,R. L. M. Corradi,M. Santander-García,E. Villaver,P. Rodríguez-Gil,K. Verro,I. Kolka
Physics , 2013,
Abstract: Due to their large expansion speed, the apparent growth of nearby nova remnants such as GK Per can be easily resolved from ground-based optical imagery on a timescale of months. If the expansion in the plane of the sky is coupled with the Doppler shift velocities, an almost complete dynamical picture is drawn. We will discuss our latest results of such a study on GK Per.
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