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18 results on '"M. C. Ramirez"'

1. Evolutionary Learning Using a Sensitivity-Accuracy Approach for Classification

Author

Sánchez-Monedero, Javier, Hervás-Martínez, C., Martínez-Estudillo, F. J., Ruz, Mariano Carbonero, Moreno, M. C. Ramírez, Cruz-Ramírez, M., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Corchado, Emilio, editor, Graña Romay, Manuel, editor, and Manhaes Savio, Alexandre, editor

Published
2010
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2. The young stellar content of the giant HII regions M8, G333.6-0.2, and NGC6357 with VLT/KMOS

Author

Ben Davies, Difeng Guo, H. Linz, Anna Pasquali, Th. Henning, Henrik Beuther, A. de Koter, M. Gennaro, Lex Kaper, J. De Ridder, M. C. Ramirez-Tannus, J. Poorta, Tim Naylor, Wolfgang Brandner, O. H. Ramirez-Agudelo, Hugues Sana, A. Bik, Low Energy Astrophysics (API, FNWI), and High Energy Astrophys. & Astropart. Phys (API, FNWI)

Subjects
stars, INTERSTELLAR EXTINCTION, HII regions, pre-main sequence, 010504 meteorology & atmospheric sciences, FOS: Physical sciences, Context (language use), Astrophysics, Astronomy & Astrophysics, Stellar classification, Computer Science::Digital Libraries, SEQUENCE, 01 natural sciences, Spectral line, X-rays, 0103 physical sciences, 010303 astronomy & astrophysics, Spectrograph, Stellar evolution, Solar and Stellar Astrophysics (astro-ph.SR), QC, 0105 earth and related environmental sciences, O-type star, QB, Physics, Very Large Telescope, Science & Technology, stars [infrared], formation, Astrophysics::Instrumentation and Methods for Astrophysics, LAGOON NEBULA, Astronomy and Astrophysics, DISC, Astrophysics - Astrophysics of Galaxies, Physics::History of Physics, SPECTRAL ATLAS, Stars, CONTINUUM, Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Physical Sciences, 8.0 MU-M, OBJECTS, K-BAND SPECTROSCOPY
Abstract

Context: The identification and characterisation of populations of young massive stars in (giant) HII regions provides important constraints on i) the formation process of massive stars and their early feedback on the environment, and ii) the initial conditions for population synthesis models predicting the evolution of ensembles of stars. Aims: We identify and characterise the stellar populations of the following young giant HII regions: M8, G333.6-0.2, and NGC6357. Methods: We acquired H- and K-band spectra of around 200 stars using The K-band KMOS on the ESO Very Large Telescope. The targets for M8 and NGC6357 were selected from the MYStIX project, which combines X-ray observations with near-infrared and mid-infrared data. For G333.6-0.2, the sample selection is based on the near-infrared colours combined with X-ray data. We introduce an automatic spectral classification method in order to obtain temperatures and luminosities for the observed stars. We analyse the stellar populations using their photometric, astrometric, and spectroscopic properties and compared the position of the stars in the Hertzprung-Russell diagram with stellar evolution models to constrain their ages and mass ranges. Results: We confirm the presence of candidate ionising sources in the three regions and report new ones, including the first spectroscopically identified O stars in G333.6-0.2. In M8 and NGC6357, two populations are identified: i) OB main-sequence stars ($M > 5~\rm{M_{\odot}}$) and ii) pre-main sequence stars ($M\approx0.5-5~\rm{M_{\odot}}$). The ages of the clusters are $\sim$1-3~Myr, $< 3$~Myr, and $\sim$0.5-3~Myr for M8, G333.6-0.2, and NGC6357, respectively. We show that MYStIX selected targets have $>$ 90\% probability of being members of the HII region, whereas a selection based on near infrared (NIR) colours leads to a membership probability of only $\sim$70\%., Accepted for publication in A&A. The arXiv version includes appendix C, which is an online only figure in A&A

Published
2019

3. Diffuse interstellar bands in the HII region M17: Insights into their relation with the total-to-selective visual extinction $R_V$

Author

Lex Kaper, A. de Koter, N. L. J. Cox, M. C. Ramirez-Tannus, Low Energy Astrophysics (API, FNWI), Faculty of Science, and High Energy Astrophys. & Astropart. Phys (API, FNWI)

Subjects
Physics, H II region, Line-of-sight, 010308 nuclear & particles physics, Extinction (astronomy), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, medicine.disease, 01 natural sciences, Astrophysics - Astrophysics of Galaxies, Interstellar medium, Stars, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), 0103 physical sciences, Visual extinction, medicine, 010303 astronomy & astrophysics, Equivalent width, Solar and Stellar Astrophysics (astro-ph.SR), Cosmic dust
Abstract

Diffuse interstellar bands (DIBs) are broad absorption features measured in sightlines probing the diffuse interstellar medium. Although large carbon-bearing molecules have been proposed as the carriers producing DIBs, their identity remains unknown. The sight line to the young massive star-forming region M17 shows anomalous extinction in the sense that the total-to-selective extinction parameter differs significantly from the average Galactic value and may reach values $R_{V} > 4$. Given the high $R_V$ values, we investigate whether the DIBs in sight lines towards young OB stars in M17 show a peculiar behaviour. We measure the properties of the most prominent DIBs in M17 and study these as a function of $E(B-V)$ and $R_{V}$. The DIB strengths in M17 concur with the observed relations between DIB equivalent width and reddening $E(B-V)$ in Galactic sight lines. For several DIBs we discover a linear relation between the normalised DIB strength EW/$A_{V}$ and $R_{V}^{-1}$. These trends suggest two groups: (i) a group of ten moderately strong DIBs that show a sensitivity to changes in $R_{V}$ that is modest and proportional to DIB strength, and (ii) a group of four very strong DIBs that react sensitively and to a similar degree to changes in $R_{V}$, but in a way that does not appear to depend on DIB strength. The DIB behaviour as a function of reddening is not peculiar in sight lines to M17. Also, we do not detect anomalous DIB profiles as seen in Her 36. DIBs are stronger, per unit visual extinction, in sight lines characterised by a smaller value of $R_{V}$ (large fraction of small dust particles). New relations between extinction normalised DIB strengths, EW/$A_V$, and $R_V$ support the idea that DIB carriers and interstellar dust are connected. Given the distinct behaviour of two groups of DIBs, different types of carriers do not necessarily relate to the dust grains in a similar way., has been shortened. Accepted for publication in A&A. 14 pages, 7 pages of appendix, 28 figures

Published
2018
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4. Massive pre-main-sequence stars in M17

Author

M. C. Ramirez-Tannus, Hugues Sana, L. E. Ellerbroek, Lex Kaper, A. Bik, Frank Tramper, A. de Koter, Bram B. Ochsendorf, O.H. Ramírez-Agudelo, Low Energy Astrophysics (API, FNWI), Faculty of Science, API Other Research (FNWI), and High Energy Astrophys. & Astropart. Phys (API, FNWI)

Subjects
HII regions, Stellar population, Infrared, Young stellar object, Continuum (design consultancy), FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, variables: T Tauri [stars], Spectral line, early-type [stars], pre [stars], massive [stars], 0103 physical sciences, Protostar, Astrophysics::Solar and Stellar Astrophysics, Herbig Ae/Be accretion, Emission spectrum, 10. No inequality, 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics::Galaxy Astrophysics, O-type star, Physics, Infrared excess, 010308 nuclear & particles physics, accretion disks, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, main sequence, Accretion (astrophysics), Stars, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Astrophysics::Earth and Planetary Astrophysics, Main sequence
Abstract

The formation process of massive stars is still poorly understood. Massive young stellar objects (mYSOs) are deeply embedded in their parental clouds, they are rare and thus typically distant, and their reddened spectra usually preclude the determination of their photospheric parameters. M17 is one of the best studied HII regions in the sky, is relatively nearby, and hosts a young stellar population. With X-shooter on the ESO Very Large Telescope we have obtained optical to near-infrared spectra of candidate mYSOs, identified by Hanson et al. (1997), and a few OB stars in this region. The large wavelength coverage enables a detailed spectroscopic analysis of their photospheres and circumstellar disks. We confirm the pre-main sequence (PMS) nature of six of the stars and characterise the O stars. The PMS stars have radii consistent with being contracting towards the main sequence and are surrounded by a remnant accretion disk. The observed infrared excess and the (double-peaked) emission lines provide the opportunity to measure structured velocity profiles in the disks. We compare the observed properties of this unique sample of young massive stars with evolutionary tracks of massive protostars by Hosokawa & Omukai (2009), and propose that these mYSOs near the western edge of the HII region are on their way to become main-sequence stars ($\sim 6 - 20$ $M_{\odot}$) after having undergone high mass-accretion rates (${\dot{M}_{\rm acc}} \sim 10^{-4} - 10^{-3}$ $M_{\odot}$ $\rm yr^{-1}$). Their spin distribution upon arrival at the zero age main sequence (ZAMS) is consistent with that observed for young B stars, assuming conservation of angular momentum and homologous contraction., Accepted for publication in A&A. Appendixes A and B have been truncated due to size limitations, the full version will be available on A&A

Published
2017

5. A dearth of short-period massive binaries in the young massive star forming region M17 Evidence for a large orbital separation at birth?

Author

Hugues Sana, A. de Koter, Frank Tramper, M. C. Ramirez-Tannus, A. Bik, Lex Kaper, Low Energy Astrophysics (API, FNWI), Faculty of Science, API Other Research (FNWI), and High Energy Astrophys. & Astropart. Phys (API, FNWI)

Subjects
Young stellar object, FOS: Physical sciences, Binary number, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, spectroscopic [binaries], 01 natural sciences, Bin, early-type [stars], 0103 physical sciences, Cutoff, Multiplicity (chemistry), 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics::Galaxy Astrophysics, Physics, formation [stars], individual: M 17 [open clusters and associations], 010308 nuclear & particles physics, Star formation, Sigma, Astronomy and Astrophysics, Stars, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Astrophysics::Earth and Planetary Astrophysics
Abstract

The formation of massive stars remains poorly understood and little is known about their birth multiplicity properties. Here, we investigate the strikingly low radial-velocity dispersion measured for a sample of 11 massive pre- and near-main-sequence stars (sigma_rv = 5.6 +/- 0.2 km/s) in the young massive star forming region M17 to obtain first constraints on the multiplicity properties of young massive stellar objects. Methods: We compute the RV dispersion of synthetic populations of massive stars for various multiplicity properties and we compare the simulated sigma_rv distributions to the observed value. We specifically investigate two scenarios: a low binary fraction and a dearth of short-period binary systems. Results: Simulated populations with low binary fractions (f_bin = 0.12_{-0.09}^{+0.16}) or with truncated period distributions (P_cutoff > 9 months) are able to reproduce the low sigma_rv observed within their 68%-confidence intervals. Parent populations with f_bin > 0.42 or P_cutoff < 47 d can however be rejected at the 5%-significance level. Both constraints are contrast with the high binary fraction and plethora of short-period systems found in few Myr-old, OB-type populations. To explain the difference, the first scenario requires a variation of the outcome of the massive star formation process. In the the second scenario, compact binaries must form later on, and the cut-off period may be related to physical length-scales representative of the bloated pre-main-sequence stellar radii or of their accretion disks. Conclusions: If the obtained constraints are representative of the overall properties of massive young stellar objects, our results may provide support to a formation process in which binaries are initially formed at larger separations, then harden or migrate to produce the typical (untruncated) power-law period distribution observed in few Myr-old OB binaries., 5 pages; Accepted for publication in Astronomy and Astrophysics Letters

Published
2017

7. Hydrothermal Synthesis and Structure of Nickel(II) Metavanadate Monohydrate, NiV2O6.H2O

Author

M. D. Marcos, M. C. Ramirez De Arellano, Pedro Amorós, and Aurelio Beltrán-Porter

Subjects
Nickel, Crystallography, Chemistry, Nickel compounds, Tetrahedron, Hydrothermal synthesis, chemistry.chemical_element, Molecule, Vanadate, General Medicine, Crystal structure, Hydrate, General Biochemistry, Genetics and Molecular Biology
Abstract

The structure of NiV 2 O 6 .H 2 O consists of infinite chains of [VO 4 ] tetrahedra running along the [100] direction connected by isolated [Ni 2 O 8 (H 2 O) 2 ] dimeric entities to build up a three-dimensional network. A valence-bond analysis allows the identification of the O atoms of the water molecules

Published
1995

8. Prasugrel versus clopidogrel for acute coronary syndromes without revascularization

Author

L. Wang, T. Stys, William E. Boden, R. H. Urbano, D. M. Olinic, Karen S. Pieper, A. Kuijper, E. Soh, J. Nicolau, Jadwiga Nessler, William J. Rogers, Ernesto Rivera, R. Braam, H. Kadr, J. Csikasz, B. Boichev, Prafulla Kerkar, I. Kraiz, R. Babu, Ali Aydinlar, D. Safley, O. Nguyen-Khac, P. Chua, W. Buchanan, C. A. Morales, A. Abyankar, A. Srinivas, S. Genth-Zotz, J. Rocha Faria Neto, D. Drenning, L. Moretti, S. Varma, D. Roth, C. Matei, Jane E. Onken, H. Tumbev, P. Keeling, Xian Li, N. Ciglenecki, Shahyar M. Gharacholou, P. P. Goh, D. Sporn, M. Chang, Marcin Gruchała, R. Foreman, Bogdan Minescu, S. Nawaz, N. Alexeeva, Y. Shalev, C. Fastabend, L. van Zyl, J. F. Certic, J. Longo, J. Wang, K. Dave, Olivier Morel, F. Maatouk, Y. El Rakshy, J. Giacomini, P. Lazov, R. Marino, Dimitar Raev, M. Y. Chan, L. Z. Dextre, Y. Hao, P. Sepulveda, K. Ramshev, C. Bayron, Ameer Kabour, Alon Marmor, Luciano Moreira Baracioli, H. Marais, Rajendra H. Mehta, R. Breedveld, A. Ben Khalfallah, Kurtulus Ozdemir, I. Westendorp, J. A. Quion, Daniel J. George, D. F. Garcia, J.-P Bassand, G. Szalai, Huw Griffiths, O. Ushakov, M. Tzekova, E. Suprun, A. Mowafy, N. El Mansour, Gail V.W. Johnson, Tereshchenko Sn, W. T. Lai, Petr Widimsky, Hany Ragy, V. R. Castillo, M. Padour, Gilles Montalescot, Louie Tirador, Deepak L. Bhatt, M. Marrinan, S. Promisloff, A. Nambiar, Reginald G.E.J. Groutars, S. R. Lee, J. Cabrera, S. Zhang, András Jánosi, K. Wita, R. Sciborski, Annabelle Rodriguez, P. Sedlon, Jaroslaw D. Kasprzak, A. Faynyk, A. Romero Acuña, M. C. Ramirez, Rakesh Gupta, R. Saligrama, Jacek Gniot, Y. Ke, John H. Alexander, X. Liu, E. Baranov, R. Grzywna, Mukul Sharma, A. Linka, Jarosław Wójcik, Haroon Rashid, M. S. Sanchez, M. Gadkari, B. Rao, James S. Zebrack, Paul W. Armstrong, Francois Schiele, Gracita O. Topacio, Peter J. Casterella, A. Belhassane, P. Golino, F. Plat, P. Roberts-Thomson, K. S. Kim, Stephen D. Wiviott, Mathew T. Roe, Y. D. Chen, I. A. Khan, S. Thanvi, S. Isserman, G. Falck, R. M. Coching, S. C. Stamate, M. Ogorek, K. Danisa, Poul Anders Hansen, M. Medvegy, Amos Katz, R. K. Seerangachar, B. Farah, V. Kale, B. Kusnick, Maurice Pye, M. Mosseri, M. Vatutin, D. Weinstein, Norma Keller, A. Mihov, Ewa Mirek-Bryniarska, N. Adjei, S. Sethi, A. Irimpen, M. Broeders, T. Huynh, K. Niezgoda, P. Samardzic, D. Ziperman, Stuart J. Pocock, T. Arad, J. Lewczuk, M. Amuchastegui, R. Moscoso, B. Dimov, W. A. Ahmad, E. Dalli, P. Laothavorn, S. Shaikh, Helmut U. Klein, J. Menon, H. Colombo, L. Fattore, G. Zarrella, Dorairaj Prabhakaran, N. Viboolkitvarakul, Judith D. Goldberg, Neetika Garg, Y. Hasin, F. Rossi Dos Santos, S. J. Vigo, L. Horbach, O. Prokhorov, H. Moellmann, T. R. Vera, C. E. Botta, Domitilla Russo, M. Rossovskaya, David C. Henderson, Rebecca B. Costello, V. Shcherbak, C. J.P.J. Werter, W. Kus, I. Dobre, P. Marechal, T. Nair, H. Nielsen, J. Waites, J. B. Moraes Junior, T. Römer, J. Senior, P. Ionescu, S. Kalashetti, R. N. Ortega, Gail E. Hafley, G. A. Dan, Apur R. Kamdar, Ruth Ann Greenfield, David F. Kong, J. Bergallo, O. Barnum, Antonis S. Manolis, Sumeet Subherwal, S. Schaefer, A. Figueredo, Habib Gamra, S. Bandyopadhyay, V. Miloradovic, Imran Arif, Peter R. Carroll, M. Demirtas, S. Guidera, G. Rogelio, Naseem Jaffrani, N. Mulvihill, Marvin J. Slepian, Darren K. McGuire, Rohit Kalra, Luís A. Providência, F. Van de Werf, Andras Vertes, J. Xu, C. F. Gamio, R. G. Xuereb, R. F. Ramos, E. Kis, N. Bustros, M. De Luca, S. Zhurba, T. Connelly, S. Singhi, F. Gredler, Serdar Kucukoglu, Francesco Fedele, C. Chavez, Christoph Kadel, Antônio Carlos Sobral Sousa, S. Srimahachota, Igor Kaidashev, J. H. Garcia, I. Teodorescu, Birute Petrauskiene, O. Kracoff, Liwa T. Younis, Alain Bouchard, P. Osmancik, Y. Sun, C. Hammett, S. Sabri, William Wallace, Mehmet Yazici, L. Ermoshkina, Harish Chandna, G. Ramos-Lopez, M. Bronisz, Sergio Luiz Zimmermann, Giuseppe Ambrosio, V. Hergeldjieva, César A. Jardim, A. Rifai, H. Lui, A. Lee, J. Scholz Issa, A. Blenkhorn, P. Micale, V. Barbarich, C. Maccallum, Peter J. Grant, G. Topacio, N. Budassi, J. Yan, Keith A.A. Fox, Y. Xia, Jan H. Cornel, A. Rafael, Paul Hermany, S. Potthoff, Mohsin A.F. Khan, Pierre Coste, Neal Ready, N. T. Duda, M. Reyes, A. Chandran, I. G. Gordeev, Anne W. Beaven, B. J.B. Hamer, C. Treasure, Pravin Manga, M. R. Babarskiene, T. Devedzhiev, Alberto Menozzi, L. Lenarz, N. Llerena, Thomas F. Lüscher, Giovânio Vieira da Silva, Y. Malynovsky, L. Ramanathan, M. Belicova, M. O. Ibarra, D. Chew, R. Castillo, M. Kesselbrenner, A. H. Li, E. Baldjiev, M. El-Harari, S. H. Hur, S. Chiaramida, C. E. Chiang, Viliam Fridrich, L. R. Cartasegna, A. Yagensky, Steven E. Hearne, Gregory Pavlides, Witold Rużyłło, Y. Chandrashekhar, S. Welka, H. Petijean, Jose L. Leiva-Pons, Shaul Atar, Andrzej Lubiński, S. Zhao, János Tomcsányi, Narinder Singh, D. Banker, T. Boyek, H. Ebinc, N. Calambur, A. Mouhaffel, M. Creteanu, H. Huang, J. O. Jeong, E. Goudreau, D. Alexopoulos, E. Duronto, S. Car, O. Bashkirtsev, J. Mandak, V. Papademetriou, David O. Williams, Oscar Pereira Dutra, R. Baman, T. J. Hong, J. O. Ibañez, D. L. Gomez, R. K. Jain, R. Jozwa, L. Di Lorenzo, Matthew Wilson, Christian W. Hamm, A. Buakhamsri, Nikitas Moschos, Ashok Kumar, A. Kadiiski, C. Y. Lee, M. Opazo, J. Tang, E. Ferrari, P. Colon-Hernandez, Jean-Pierre Déry, B. Goloborodko, L. Gimple, Diego Ardissino, M. Bergovec, S. Thew, Dariusz Dudek, K. Tang, P. A.G. Zwart, A. Deshpande, S. Sathe, Yves Cottin, V. Pai, O. Koval, J. Lesnik, Pavan S. Reddy, A. Espinoza, Rungroj Krittayaphong, Carisi Anne Polanczyk, E. Kukuy, L. Tejada, J. Nobel, Renato D. Lopes, J. Bagatin, A. Manolova, E. Boudriot, A. Godoy, N. Perepech, Christopher D. Olympios, A. E. Guimarães, James Harris, Aref Rahman, D. Foley, H. J. Kruik, J. Bruguera I Cortada, I. Fotiadis, A. Bharani, Petar Otasevic, Eileen Brown, N. Gratsiansky, J. E. Poulard, Vladimir Gašparović, Habib Haouala, A. de Belder, J. Schmedtje, Lilia Nigro Maia, J. Cobos, Werner Benzer, E. Korban, A. U. Quraishi, X. Hong, A. Bazzi, P. Kotha, L. Gubolino, H. Ingersoll, Debra Marshall, Udo Sechtem, Sandipan Dutta, G. Frago, Anthony Mathur, Shaun G. Goodman, William Bachinsky, A. Hamer, Jaime Gomez, Patrizio Lancellotti, Vance Wilson, L. White, P.P. Mohanan, Aleksandar Knezevic, Sorin J. Brener, Susanna R. Stevens, H. Luquez, S. K. Lee, P. E. Leaes, P. Benjarge, T. Tu, Z. Coufal, N. Koliopoulos, Mahmut Şahin, X. Huang, S. Boldueva, J. De Souza, N. Chidambaram, S. Zolyomi, K. G. Shyu, H. Montecinos, A. Piombo, Wladmir Faustino Saporito, R. L. Kulkarni, I. Szakal, G. Arminio, M. Elbaz, Samir Pancholy, Jang Ho Bae, Giuseppe Musumeci, S. B. Zouari, A. Chois, D. Wojciechowski, A. Bakbak, E. Bozkurt, Kenneth J. Winters, R. Raugaliene, D. Sarkar, J. M. Alegret, Hubertus Heuer, E. Bobescu, E. Roncallo, R. Carlsson, R. Craig McLendon, L K Newby, K. Zrazhevskiy, João Pedro Ferreira, A. Haidar, D. Tellez, Robert Olszewski, Shmuel Gottlieb, H. Jure, A. Garcia Escudero, S. Sengupta, V. Ochean, W. Kostuk, G. Range, F. Leroy, G. Parale, R. Fernandez, M. Fulwani, M. Padovan, Y. Dovgalevskiy, Kreton Mavromatis, H. Hart, Y. G. Ko, F. Seixo, V. Bisne, J. McGarvey, Kimberly L. Blackwell, John H. Strickler, Sanjay Kumar, A. Bordonava, L. Egorova, C. Patocchi, A. Karczmarczyk, Chiara Melloni, Piyamitr Sritara, M. Anastasiou-Nana, Roman Szełemej, K. Penchev, D. Morales, M. Tokmakova, Krzysztof Zmudka, Rakesh Yadav, E. Bressollette, D. Nul, A. L. Astesiano, M. Urban, Abdulhay Albirini, C. T. Chin, F. Moulin, I. M. Coman, R. Watkin, J. Abanilla, J. Brønnum-Schou, J. Anusauskiene, P. Andrade Lotufo, Joseph G. Rogers, M. Bessen, P. C. Sartori, Paulo Roberto Ferreira Rossi, K. Atassi, H. V. Anderson, B. Klugherz, Bateshwar Prasad Singh, Mirza S. Baig, Z. Yusof, J. H. Geertman, A. Labroo, P. Nash, Freek W.A. Verheugt, Nancy J. Brown, M. A. Alcocer, A. Neskovic, L. Francek, Judith S. Hochman, A. Hoffmann, R. Dran, A. Podczeck-Schweighofer, Jeffry Katz, Josh Roberts, Roger E. McLendon, Ronald Rodriguez, T. Downes, A. Roth, L. E. Mayorga, Armagan Altun, José-Luis López-Sendón, M. Krotin, N. van der Merwe, O. Gigliotti, C. Park, G. Brigden, M. Kumbla, D. C G Basart, D. Erdogan, R. van Kranen, J. Beloscar, Johny Joseph, Pierluigi Tricoci, J. Marino, N. Mahon, S. Dani, I. Kovalskyy, Ioannis Nanas, V. Volkov, M. I. Edmilao, J. Kruells-Muench, F. Alamgir, R. Rinaldi, W. E. Mogrovejo, J. Mirat, C. Staniloae, S. Borromeo, H. Kozman, H. Zhang, Y. Zhou, S. Shurmur, A. Manari, M. A. Barrera, A. Vasylenko, D. Keedy, Paul A. Gurbel, Ali Oto, Charles R. Lambert, V. G. Ribeiro, A. Quintero, H. Joshi, L. Tang, J. Allan, C. S. Díaz, F. Carvalho Neuenschwander, Mircea Cintezǎ, M. Kokles, G. Piovaccari, Z. Kovacs, W. Li, C. Beauloye, E. J. Ramos, D. Bertolim Precoma, J. Burstein, G. Covelli, E. C. Zambrano, Assen Goudev, A. Tang, F. Henriquez, S. Tangsuntornwiwat, C. Kirma, GR Aycock, Kenneth W. Mahaffey, M. Ardnt, Jose C. Nicolau, O. Barbarash, E. K. Shin, P. Potapenko, T. Supryadkina, Asok Venkataraman, W. Mogrovejo, M. Acikel, R. Bohorquez, M. Syvänne, M. Chan, H. Mardikar, H. Berlin, O. Quintana, K. Heintz, J. M. Bastos, Guillermo Llamas Esperon, G. Aroney, J. Chen, Nancy H. Collins, C. Ahsan, G. Heins, F. Baer, V. Kondle, Nicholas Danchin, G. Shetty, Sergio Berti, Philip E. Aylward, James Cotton, G. S. Vallejo, Massimo Volpe, Z. Vasiljevic-Pokrajcic, C. Bugueño, Seung Woon Rha, S. Ilic, G. E. Stanciulescu, Z. Li, D. Nassiacos, R. Sciberras, S. Kuanprasert, Denilson Campos de Albuquerque, M. Pavlovic, Craig S. Barr, Mohammed R. Essop, John G. Canto, David T. Roberts, M. Ozdemir, Jacquelyn Miller, T. K. Ong, Sian E. Harding, V. Bose, J. Yoon, R. Syan, M. A. Paz, O. Maskon, Dennis V. Cokkinos, L. Kraus, Z. Masud, K. Amosova, M. Boyarkin, L. Mos, Dmitry Zamoryakhin, Arif Anis Khan, Jeffrey A. Breall, A. Gallino, Ivo Petrov, F. A. Alves da Cost, Saul Vizel, Hugo Vargas Filho, P. Kaewsuwanna, G. Antonelli, Chuen Den Tseng, I. Vakaliuk, J. Miklin, A. El Hawary, Ashok Jacob, D. Gumm, Kurt Huber, G. Pajes, N. Jathappa, Stanislaw Bartus, P. V. Lavhe, C. Romero, J. Balkin, T. Gould, R. Durgaprasad, Felipe Martinez, Henning Ebelt, A. Puri, D. K. Agarwal, E. E. Buyukoner, R. Mora Junior, P. Poliacik, A. Dande, X. Zhao, J. Floro, A. Bagriy, Yuliya Lokhnygina, M. Atieh, V. Batushkin, Valentin Markov, O. Karpenko, Peter Clemmensen, P. Castro, L. Paloscia, F. Florenzano, J. L. Accini, Tony Schibler, J. Arneja, W. Wu, B. Andruszkiewicz, Michael A. Morse, P. Vojtisek, D. Sadler, S. Frischwasser, M. Cayli, W N Leimbach, E. Flores, B. Wang, A Sosa Liprandi, Y. Michalaros, H. C. Finimundi, Raul D. Santos, N. Vijay, E. Magnus Ohman, Y. Karpenko, J. Sirotiakova, Z. Shogenov, D A Zateyshchikov, Eric P. Viergever, R. Bach, Gary S. Niess, D. C. Acosta, G. Piegari, J. B. Gupta, J. Shanes, E. Ronner, J. Arter, Claudio Cavallini, M. A. Hominal, V. Bugan, S. D. Varini, K. Nyman, B. G. Castillo, Sinan Aydoğdu, N. Novikova, D. Wang, P. Simpson, Y. Huang, Taral Patel, Gabriel Tatu-Chitoiu, D. Silva Junior, H. Theron, C. Alvarez, Anikó Ilona Nagy, T. Chua, P. Georgiev, D. Rittoo, G. De Luca, R. Blonder, Alberto Caccavo, D. Koganti, E. Manenti, N. Ghaisas, G. Letcher, D. Platogiannis, Arshed A. Quyyumi, J. Dy, Z. Ples, W. Kunz Sebba Barroso de Souza, Hamid Taheri, S. Kammoun, A. Salvioni, B. Stockins, K. Sutalo, J. C. Post, Merih Kutlu, Vijay K. Chopra, C. Mathis, Stephen M. Schwartz, Manish Jain, D. Coisne, A. Goudev, A. Dalby, João Morais, P. van Kalmthout, Andrzej Budaj, I. Dotani, L. Mircoli, R. Vicari, J. P. Herrman, M. Moran, G. Lupkovics, Alexander Parkhomenko, J. Heath, Andrew Moriarty, C. Pop, J. Y. Hwang, S. Kassam, R. Martingano, I. Nikolskaya, Z. Zheng, Johann S. de Bono, M. Izzo, R. Labonte, E. H. Forte, W. Moleerergpoom, Piera Angelica Merlini, D. Lee, W. Macias, G. Syan, S. Zhou, S. W. Kim, T. Duris, E. Shaoulian, Andreas U. Wali, Marco Antonio Mota Gomes, Pritibha Singh, M. Ovize, M. Del Core, W. Bowden, B. Xu, Ravi Bhagwat, C. Wongvipaporn, J. Vojacek, Steven Lindsay, F. McGrew, J. Gorny, J. D. Pappas, R. Vuyyuru, J. Chahin, Ashraf Reda, T. Lau, E. Conn, J. Meisner, S. Meymandi, A. D. Hrabar, M. Slanina, D. Jarasuniene, C. Lang, A. Vo, Christian Hamm, H. Gogia, Z. Yuan, T. Mathew, A. Van Dorpe, J. Kettner, M. Barbiero, Harvey D. White, L. Rudenko, V. Jain, M. Carter, David Erlinge, G. Ma, V. Sierkova, D. K. Kim, Steven O. Smith, R. K. Premchand, P. Jetty, J. Y. Hou, V. Simanenkov, T. Kaelsch, David P. Foley, A. Francis, Piotr Ponikowski, Ramón Corbalán, D. Connolly, J. Tuma, R. Zambahari, Miodrag Ostojic, R. Lamich, A. Rabelo Alves, V. Tseluyko, G. Moises Azize, L. Khaisheva, G. Pencheva, C. Ingram, J. Cooke, A. Prado, M. De Tollenaere, M. Kim, Alan Rees, Melanie B. Turner, Mark B. Abelson, H. L. Luciardi, L. Illyes, R. Sarma, L. Manriquez, J. A. Marin Neto, D. Iordachescu-Petica, G. Hoedemaker, Victor S. Gurevich, F. Ridocci, J. Grman, F. Waxman, Jorge F. Saucedo, E. Boughzala, B. S. Jagadesa, Heba Abdullah, A. Weiss, N. Bichan, L. Tami, Y. Bouzid, N. I. Gomez, Zafar Sy, Béla Merkely, J. P. Albisu, L. Rodriguez-Ospina, John C. Chambers, L. L. Lobo Marquez, R. Guan, Steven Georgeson, M. K. Sarna, L. Nogueira Liberato de Sousa, Mika Laine, P. Pimentel Filho, Teresa Kawka-Urbanek, G P Arutyunov, S. Elhadad, A. Dambrauskaite, R. Leon de la Fuente, Audes D. M. Feitosa, P. Baetslé, Abraham Al Ahmad, José Francisco Kerr Saraiva, Roland P.T. Troquay, J. Berlingieri, Margaret Arstall, J. L. Coronado, K. Yang, S. V. Shalaev, Bernard J. Gersh, A. El-Etreby, Elżbieta Zinka, F. De Valais, John E.A. Blair, P. Fajardo, M. Rodriguez, R. Boujnah, H. Hammerman, Y. S. Chong, Stigi Joseph, M. H. Jeong, J. Ge, Q. He, Robert S Iwaoka, Bimal R. Shah, J. Sawhney, T. Sakulsaengprapha, G. Werner, Jill Anderson, M. Hondl, Meinrad Gawaz, Gilmar Reis, M. Dalkowski, Tomáš Janota, M. Damiao Gomes Seabra, A. Dharmadhikari, Aleš Linhart, John Elliott, Kodangudi B. Ramanathan, Doron Zahger, Dilek Ural, L. Regos, F. R. Bolohan, Marcello Galvani, B. Zakhary, N. Qureshi, D. Deac, Maria Emília Figueiredo Teixeira, T. Venter, Santosh Gupta, W. Wright, P. Telekes, A. Furber, V. Nykonov, Zhu Junren, M. Cinteza, I. Lang, S. Junejo, D. Martins, Mauro Esteves Hernandes, G. Ishmurzin, Anthony J. Dalby, R. Scioli, P. Babu, R. Habaluyas, V. Mendoza, G. B. Scaro, Matthew T. Roe, M. Senaratne, D. J. van der Heijden, T. Pillay, Yoav Turgeman, J. Moreira, C. Cuccia, C. Astarita, S. De Servi, Robert G. Wilcox, M. C. Constantinescu, Kardiyoloji, Roe Matthew, T., Armstrong Paul, W., Fox Keith, A. A., White Harvey, D., Prabhakaran, Dorairaj, Goodman Shaun, G., Cornel Jan, H., Bhatt Deepak, L., Clemmensen, Peter, Martinez, Felipe, Ardissino, Diego, Nicolau Jose, C., Boden William, E., Gurbel Paul, A., Ruzyllo, Witold, Dalby Anthony, J., McGuire Darren, K., Leiva Pons Jose, L., Parkhomenko, Alexander, Gottlieb, Shmuel, Topacio Gracita, O., Hamm, Christian, Pavlides, Gregory, Goudev Assen, R., Oto, Ali, Tseng Chuen, Den, Merkely, Bela, Gasparovic, Vladimir, Corbalan, Ramon, Cinteza, Mircea, McLendon R., Craig, Winters Kenneth, J., Brown Eileen, B., Lokhnygina, Yuliya, Aylward Philip, E., Huber, Kurt, Hochman Judith, S., Ohman E., Magnu, and Golino, Paolo

Subjects
Male, Prasugrel, Myocardial Infarction, Kaplan-Meier Estimate, Piperazines, Purinergic P2 Receptor Antagonists, Myocardial infarction, education.field_of_study, Cardiovascular diseases [NCEBP 14], Acute Coronary Syndrome, Aged, Angina, Unstable, Aspirin, Cardiovascular Diseases, Double-Blind Method, Drug Therapy, Combination, Female, Follow-Up Studies, Humans, Middle Aged, Platelet Aggregation Inhibitors, Prasugrel Hydrochloride, Stroke, Thiophenes, Ticlopidine, Medicine (all), Hazard ratio, Clopidogrel, Acute Coronary Syndromes, General Medicine, Angina, Combination, Cardiology, medicine.drug, medicine.medical_specialty, Acute coronary syndrome, Population, Unstable, Drug Therapy, General & Internal Medicine, Internal medicine, medicine, cardiovascular diseases, education, Acute coronary syndromes, Revascularisation, Unstable angina, business.industry, medicine.disease, REVASCULARIZAÇÃO MIOCÁRDICA, business
Abstract

Item does not contain fulltext BACKGROUND: The effect of intensified platelet inhibition for patients with unstable angina or myocardial infarction without ST-segment elevation who do not undergo revascularization has not been delineated. METHODS: In this double-blind, randomized trial, in a primary analysis involving 7243 patients under the age of 75 years receiving aspirin, we evaluated up to 30 months of treatment with prasugrel (10 mg daily) versus clopidogrel (75 mg daily). In a secondary analysis involving 2083 patients 75 years of age or older, we evaluated 5 mg of prasugrel versus 75 mg of clopidogrel. RESULTS: At a median follow-up of 17 months, the primary end point of death from cardiovascular causes, myocardial infarction, or stroke among patients under the age of 75 years occurred in 13.9% of the prasugrel group and 16.0% of the clopidogrel group (hazard ratio in the prasugrel group, 0.91; 95% confidence interval [CI], 0.79 to 1.05; P=0.21). Similar results were observed in the overall population. The prespecified analysis of multiple recurrent ischemic events (all components of the primary end point) suggested a lower risk for prasugrel among patients under the age of 75 years (hazard ratio, 0.85; 95% CI, 0.72 to 1.00; P=0.04). Rates of severe and intracranial bleeding were similar in the two groups in all age groups. There was no significant between-group difference in the frequency of nonhemorrhagic serious adverse events, except for a higher frequency of heart failure in the clopidogrel group. CONCLUSIONS: Among patients with unstable angina or myocardial infarction without ST-segment elevation, prasugrel did not significantly reduce the frequency of the primary end point, as compared with clopidogrel, and similar risks of bleeding were observed. (Funded by Eli Lilly and Daiichi Sankyo; TRILOGY ACS ClinicalTrials.gov number, NCT00699998.).

Published
2012

10. ChemInform Abstract: Hydrothermal Synthesis and Structure of Nickel(II) Metavanadate Monohydrate, NiV2O6×H2O

Author

Aurelio Beltrán-Porter, Pedro Amorós, M. C. Ramirez De Arellano, and M. D. Marcos

Subjects
Crystallography, Nickel, Chemistry, Inorganic chemistry, Tetrahedron, Hydrothermal synthesis, Molecule, chemistry.chemical_element, General Medicine
Abstract

The structure of NiV 2 O 6 .H 2 O consists of infinite chains of [VO 4 ] tetrahedra running along the [100] direction connected by isolated [Ni 2 O 8 (H 2 O) 2 ] dimeric entities to build up a three-dimensional network. A valence-bond analysis allows the identification of the O atoms of the water molecules

Published
2010

13. Kinetic study of the thermal decomposition of low-grade nickeliferous laterite ores

Author

M. C. Ramirez, Félix A. López, Aurora López-Delgado, Francisco José Alguacil, and J. A. Pons

Subjects
Thermogravimetric analysis, Order of reaction, Chemistry, Low grade nickeliferous laterite ores, Kinetics, Thermal decomposition, Thermodynamics, Mineralogy, engineering.material, Condensed Matter Physics, Decomposition, Thermogravimetry, Laterite, engineering, Goethite, Physical and Theoretical Chemistry, Thermal analysis
Abstract

This study presents an evaluation of the decomposition kinetic of low-grade nickeliferous laterite by thermogravimetric analysis. Kinetic parameters were calculated using the Ozawa and the iso-conversional Friedman methods. Simplified kinetics models like those based on the reaction order were also applied for the simulations. Two-dimensional shrinkage models of the reaction interface mechanism were adopted as describing the thermal transformation process from non-isothermal kinetic analysis. The iso-conversional method (model-free kinetics) reveals that the decomposition of low-grade nickeliferous laterite does not follow a single mechanism because the determined activation energies and pre-exponential factor are not constant during the course of the reaction.

Published
2008

14. 1-Chloro-1,1-difluoro-N-(4-methoxyphenyl)-3-(pyrrolidin-2-ylidene)propan-2-imine

Author

M. C. Ramirez De Arellano, Santos Fustero, and M. García de la Torre

Subjects
chemistry.chemical_compound, Crystallography, chemistry, Hydrogen bond, Intramolecular force, Imine, Molecule, General Medicine, Crystal structure, General Biochemistry, Genetics and Molecular Biology
Abstract

In the title compound, C(14)H(15)ClF(2)N(2)O, the Z configuration has been confirmed. The molecular structure shows an intramolecular N-H.N hydrogen bond [H.N 2.04 (6), N.N 2.709 (6) A and N-H.N 124 (5) degrees ]. This interaction could be responsible for the Z configuration.

Published
2000

17. [Circumscribed or localized calcinosis]

Author

J, FINKELSTEIN, H, CUEVAS, R, ALARCON, and M C, RAMIREZ

Subjects
Calcification, Physiologic, Calcinosis, Humans, Medical Records
Published
1962

18. Lípidos de la dieta y cáncer Dietary lipids and cancer

Author

S. Granados, J. L. Quiles, A. Gil, and M. C. Ramírez-Tortosa

Subjects
Ácidos grasos, Cáncer de mama, Cáncer colorrectal, Cáncer de próstata, Nutrición enteral, Fatty acids, Breast cancer, Colon-rectal cancer, Prostate cancer, Enteral nutrition, Nutritional diseases. Deficiency diseases, RC620-627
Abstract

El cáncer es una de las principales causas de muerte en los países occidentales. Entre los factores que contribuyen a la aparición de esta enfermedad, la dieta tiene un papel fundamental, y concretamente, las grasas son el principal componente relacionado con el incremento en la incidencia de la enfermedad cancerosa; sobre todo con el cáncer de mama, colorrectal, y prostático. De los lípidos de la dieta, se ha estudiado mucho el efecto beneficioso que tiene el aceite de pescado, rico en ácidos grasos poliinsaturados de la serie n-3, así como el aceite de oliva, rico en ácidos grasos monoinsaturados -principalmente ácido oleico-. Sin embargo, se ha descrito un efecto negativo por parte de los ácidos grasos de la serie n-6 y de las grasas saturadas. La nutrición constituye un aspecto importante en la vida del paciente canceroso; actualmente, se diseñan fórmulas nutricionales suplementadas con ácidos grasos poliinsaturados de la serie n-3, y otros componentes, como la arginina, ARN, lisina, etc., con el fin de paliar los efectos derivados de esta patología. Los resultados demuestran el descenso en la morbilidad, y por tanto, aumento de la calidad de vida, un descenso de la mortalidad, y una disminución en los costes relacionados.Cancer is one of the main causes of death in Western countries. Among the factors that contribute to the appearance of this disease, diet has a fundamental role, and specifically fats are the main component related to the increase in the incidence of cancerous diseases, particularly breast, colon-rectal, and prostate cancer. From dietary lipids, much attention has been given to the beneficial effects of fish oil, rich in polyunsaturated fatty acids n-3 serie, as well as of olive oil, rich in monounsaturated fatty acids -primarily oleic acid. On the contrary, a negative effect has been reported for polyunsaturated fatty acids n-6 serie and for saturated fatty acids. Nutrition constitutes an important aspect of the life of cancer patients. Currently, nutritional formulas are being designed with supplements of polyunsaturated n-3 fatty acids and other components such as arginine, RNA, lysine, etc., with the aim of ameliorating the effects of this pathology. The results demonstrate the lower morbility and therefore improved quality of life, a decline in mortality, and a reduction in related costs.

Published
2006

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