Search results for "74"
showing 10 items of 820 documents
The discovery of the 401 Hz accreting millisecond pulsar IGR J17498-2921 in a 3.8 h orbit
2011
We report on the detection of a 400.99018734(1) Hz coherent signal in the Rossi X-ray Timing Explorer light curves of the recently discovered X-ray transient, IGR J17498-2921. By analysing the frequency modulation caused by the orbital motion observed between August 13 and September 8, 2011, we derive an orbital solution for the binary system with a period of 3.8432275(3) hr. The measured mass function, f(M_2, M_1, i)=0.00203807(8) Msun, allows to set a lower limit of 0.17 Msun on the mass of the companion star, while an upper limit of 0.48 Msun is set by imposing that the companion star does not overfill its Roche lobe. We observe a marginally significant evolution of the signal frequency …
The spin and orbit of the newly discovered pulsar IGR J17480-2446
2011
We present an analysis of the spin and orbital properties of the newly discovered accreting pulsar IGR J17480-2446, located in the globular cluster Terzan 5. Considering the pulses detected by the Rossi X-ray Timing Explorer at a period of 90.539645(2) ms, we derive a solution for the 21.27454(8) hr binary system. The binary mass function is estimated to be 0.021275(5) Msun, indicating a companion star with a mass larger than 0.4 Msun. The X-ray pulsar spins up while accreting at a rate of between 1.2 and 1.7E-12 Hz/s, in agreement with the accretion of disc matter angular momentum given the observed luminosity. We also report the detection of pulsations at the spin period of the source dur…
The pulse profile and spin evolution of the accreting pulsar in Terzan 5, IGR J17480-2446, during its 2010 outburst
2012
(abridged) We analyse the spectral and pulse properties of the 11 Hz transient accreting pulsar, IGR J17480-2446, in the globular cluster Terzan 5, considering all the available RXTE, Swift and INTEGRAL observations performed between October and November, 2010. By measuring the pulse phase evolution we conclude that the NS spun up at an average rate of =1.48(2)E-12 Hz/s, compatible with the accretion of the Keplerian angular momentum of matter at the inner disc boundary. Similar to other accreting pulsars, the stability of the pulse phases determined by using the second harmonic component is higher than that of the phases based on the fundamental frequency. Under the assumption that the sec…
Palaeogenomics of Upper Palaeolithic to Neolithic European hunter-gatherers
2023
Acknowledgements: The authors thank G. Marciani and O. Jöris for comments on archaeology; C. Jeong, M. Spyrou and K. Prüfer for comments on genetics; M. O’Reilly for graphical support for Fig. 5 and Extended Data Fig. 9; the entire IT and laboratory teams at the Department of Archaeogenetics of MPI-SHH for technical assistance; M. Meyer and S. Nagel for support with single-stranded library preparation; K. Post, P. van Es, J. Glimmerveen, M. Medendorp, M. Sier, S. Dikstra, M. Dikstra, R. van Eerden, D. Duineveld and A. Hoekman for providing access to human specimens from the North Sea (The Netherlands); M. D. Garralda and A. Estalrrich for providing access to human specimens from La Riera (S…
Pedro Gutiérrez Bueno (1743-1822) y las relaciones entre la química y la farmacia durante el último tercio del siglo XVIII
2001
This paper is part of a general research project on the role that chemistry played in transforming experimental pharmacology during nineteenth-century Spain. Within this general framework, this paper deals with the main characteristics of chemistry textbooks written by Pedro Gutiérrez Bueno (1745-1822), a pharmacist who taught chemistry in several institutions during the late eighteenth century. In an earlier paper, we have analysed the intended public of the first edition of Gutiérrez Bueno`s textbook. This paper deals with the changing institutional context in which the second edition was published. This issue is closely connected with substantial transformations in the relationship betwe…
Observacion hecha por el Dr. Gregorio Marcìa, Medico, y Cirujano de esta Ciudad de Valencia, Demostrador pùblico de Cirugia en ella, y Socio de la Re…
1749
Caplletra ornada Sign.: [ ]4 Reclams
Human cytomegalovirus pp71 stimulates major histocompatibility complex class i presentation of IE1-derived peptides at immediate early times of infec…
2013
ABSTRACT Suppression of major histocompatibility complex (MHC) class I-mediated presentation of human cytomegalovirus (HCMV) peptides is an important mechanism to avoid CD8 T lymphocyte recognition and killing of infected cells. Of particular interest is how MHC class I presentation of essential regulatory immediate early (IE) proteins of HCMV can be effectively compromised at times when known viral immunoevasins are not abundantly expressed. The tegument protein pp71 had been suggested to be involved in MHC class I downregulation. Intriguingly, this polypeptide is also critically engaged in the initial derepression of the major IE gene locus, leading to enhanced expression of IE proteins I…
Dissertacion Historica I [-III] ... / Compuesta por ... Fr. Jacinto Segura ...
1751
Les tres dissertacions es van publicar al mateix temps en un mateix volum, amb preliminars i sign. tip. comuns, però amb port. i pag. pròpia per a cada una Dissertacion historica I : que excluye la existencia de monges Basilios en el antiguo venerable Santuario de el Santo Sepulcro de Valencia : Contra las noticias falsas, y nulas del Dr. Agustin Sales ... Dissertacion historica II : que demuestra aver cursado el Patriarca Santo Domingo los Estudios de Artes, y de Theologia en la Ciudad de Palencia : Contra las noticias falsas, y nulas del Dr. Agustin Sales ... Dissertacion III curiosa, sobre la Patria, Obispado, y escritos de Idacio Galiciano el Historico ... Capitals orlades i altres or…
Dissertacion Historica I [-III] ...
Les tres dissertacions es van publicar al mateix temps en un mateix volum, amb preliminars i sign. tip. comuns, però amb port. i pag. pròpia per a cada una Dissertacion historica I : que excluye la existencia de monges Basilios en el antiguo venerable Santuario de el Santo Sepulcro de Valencia : Contra las noticias falsas, y nulas del Dr. Agustin Sales Dissertacion historica II : que demuestra aver cursado el Patriarca Santo Domingo los Estudios de Artes, y de Theologia en la Ciudad de Palencia : Contra las noticias falsas, y nulas del Dr. Agustin Sales Dissertacion III curiosa, sobre la Patria, Obispado, y escritos de Idacio Galiciano el Historico Capitals orlades i altres ornaments tip Gr…
An integrative approach to unravel the Ceratitis FAR (Diptera, Tephritidae) cryptic species complex: a review
2015
Abstract This paper reviews all information gathered from different disciplines and studies to resolve the species status within the Ceratitis FAR (Ceratitis fasciventris, Ceratitis anonae, Ceratitis rosa) complex, a group of polyphagous fruit fly pest species (Diptera, Tephritidae) from Africa. It includes information on larval and adult morphology, wing morphometrics, cuticular hydrocarbons, pheromones, microsatellites, developmental physiology and geographic distribution. The general consensus is that the FAR complex comprises Ceratitis anonae, two species within Ceratitis rosa (so-called R1 and R2) and two putatitve species under Ceratitis fasciventris. The information regarding the lat…