70 results on '"D J Armstrong"'
Search Results
2. Improved two-photon photopolymerisation and optical trapping with aberration-corrected structured light
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D. J. Armstrong, A. B Stilgoe, T. A. Nieminen, and H. Rubinsztein-Dunlop
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aberration correction ,two photon polymerization (2PP) ,holographic optical tweezers ,optical trapping ,micro-structures ,nanofabriaction ,Chemical technology ,TP1-1185 - Abstract
We demonstrate the effectiveness of phase only aberration corrections of structured light and their application to versatile optical trapping setups. We calculate phase corrections before (ex-situ) and after (in-situ) a high numerical aperture microscope objective using a spatial light modulator (SLM), and investigate how these corrections can be used to improve the efficiency and resolution of micro-structures fabricated through two-photon-photopolymerisation (2PP). We apply a phase retrieval algorithm to correct for distortions in a femtosecond laser that enables the fabrication of 3D structures using as many as 50 simultaneous foci. The inclusion of aberration correction in the fabrication process shows improved confinement of optically trapped particles and more efficient polymerisation while minimising intensity variations at individual foci, which potentially damage the structure during fabrication. We find that phase corrections allow for consistent voxel sizes, increased sharpness, and an expanded effective printing range when using an SLM, while also allowing for closer proximity of individual trap foci, minimising interference effects that hinder fabrication resolution.
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- 2022
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3. A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113
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H P Osborn, D J Armstrong, V Adibekyan, K A Collins, E Delgado-Mena, S B Howell, C Hellier, G W King, J Lillo-Box, L D Nielsen, J F Otegi, N C Santos, C Ziegler, D R Anderson, C Briceño, C Burke, D Bayliss, D Barrado, E M Bryant, D J A Brown, S C C Barros, F Bouchy, D A Caldwell, D M Conti, R F Díaz, D Dragomir, M Deleuil, O D S Demangeon, C Dorn, T Daylan, P Figueira, R Helled, S Hoyer, J M Jenkins, E L N Jensen, D W Latham, N Law, D R Louie, A W Mann, A Osborn, D L Pollacco, D R Rodriguez, B V Rackham, G Ricker, N J Scott, S G Sousa, S Seager, K G Stassun, J C Smith, P Strøm, S Udry, J Villaseñor, R Vanderspek, R West, P J Wheatley, and J N Winn
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- 2021
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4. Mass determinations of the three mini-Neptunes transiting TOI-125
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L D Nielsen, D Gandolfi, D J Armstrong, J S Jenkins, M Fridlund, N C Santos, F Dai, V Adibekyan, R Luque, J H Steffen, M Esposito, F Meru, S Sabotta, E Bolmont, D Kossakowski, J F Otegi, F Murgas, M Stalport, F Rodler, M R Díaz, N T Kurtovic, G Ricker, R Vanderspek, D W Latham, S Seager, J N Winn, J M Jenkins, R Allart, J M. Almenara, D Barrado, S C C Barros, D Bayliss, Z M Berdiñas, I Boisse, F Bouchy, P Boyd, D J A Brown, E M Bryant, C Burke, W D Cochran, B F Cooke, O D S Demangeon, R F Díaz, J Dittman, C Dorn, X Dumusque, R A García, L González-Cuesta, S Grziwa, I Georgieva, N Guerrero, A P Hatzes, R Helled, C E Henze, S Hojjatpanah, J Korth, K W F Lam, J Lillo-Box, T A Lopez, J Livingston, S Mathur, O Mousis, N Narita, H P Osborn, E Palle, P A Peña Rojas, C M Persson, S N Quinn, H Rauer, S Redfield, A Santerne, L A dos Santos, J V Seidel, S G Sousa, E B Ting, M Turbet, S Udry, A Vanderburg, V Van Eylen, J I Vines, P J Wheatley, and P A Wilson
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- 2020
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5. TESS and HARPS reveal two sub-Neptunes around TOI 1062
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J. F. Otegi, F. Bouchy, R. Helled, D. J. Armstrong, M. Stalport, A. Psaridi, J.-B. Delisle, K.G. Stassun, E. Delgado-Mena, N. C. Santos, N. C. Hara, K. Collins, S. Gandhi, C. Dorn, M. Brogi, M. Fridlund, H. P. Osborn, S. Hoyer, S. Udry, S. Hojjatpanah, L. D. Nielsen, X. Dumusque, V. Adibekyan, D. Conti, R. Schwarz, G. Wang, P. Figueira, J. Lillo-Box, A. Hadjigeorghiou, D. Bayliss, P. A. Strøm, S. G. Sousa, D. Barrado, A. Osborn, S. C. C. Barros, D. J. A. Brown, J. D. Eastman, D. R. Ciardi, A. Vanderburg, R. F. Goeke, N. M. Guerrero, P. T. Boyd, D. A. Caldwell, C. E. Henze, B. McLean, G. Ricker, R. Vanderspek, D. W. Latham, S. Seager, J. Winn, and J. M. Jenkins
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Astronomy ,Astrophysics - Abstract
The Transiting Exoplanet Survey Satellite (TESS) mission was designed to perform an all-sky search of planets around bright and nearby stars. Here we report the discovery of two sub-Neptunes orbiting around TOI 1062 (TIC 299799658), a V = 10.25 G9V star observed in the TESS Sectors 1, 13, 27, and 28. We use precise radial velocity observations from HARPS to confirm and characterize these two planets. TOI 1062b has a radius of 2.265(-0.091,+0.096) Rꚛ, a mass of 10.15 ± 0.8 Mꚛ, and an orbital period of 4.1130 ± 0.0015 days. The second planet is not transiting, has a minimum mass of 9.78(−1.18,+1.26) Mꚛ and is near the 2:1 mean motion resonance with the innermost planet with an orbital period of 7.972(−0.024,+0.018) days. We performed a dynamical analysis to explore the proximity of the system to this resonance, and to attempt further constraining the orbital parameters. The transiting planet has a mean density of 4.85(−0.74,+0.84) g/cu. cm and an analysis of its internal structure reveals that it is expected to have a small volatile envelope accounting for 0.35% of the mass at most. The star’s brightness and the proximity of the inner planet to what is know as the radius gap make it an interesting candidate for transmission spectroscopy, which could further constrain the composition and internal structure of TOI 1062b.
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- 2021
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6. TESS Data for Asteroseismology (T’DA) Stellar Variability Classification Pipeline: Setup and Application to the Kepler Q9 Data
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J. Audenaert, J. S. Kuszlewicz, R. Handberg, A. Tkachenko, D. J. Armstrong, M. Hon, R. Kgoadi, M. N. Lund, K. J. Bell, L. Bugnet, D. M. Bowman, C. Johnston, R. A. García, D. Stello, L. Molnár, E. Plachy, D. Buzasi, and C. Aerts
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- 2021
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7. Rossiter-McLaughlin detection of the 9-month period transiting exoplanet HIP41378 d
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S. Grouffal, A. Santerne, V. Bourrier, X. Dumusque, A. H. M. J. Triaud, L. Malavolta, V. Kunovac, D. J. Armstrong, O. Attia, S. C. C. Barros, I. Boisse, M. Deleuil, O. D. S. Demangeon, C. D. Dressing, P. Figueira, J. Lillo-Box, A. Mortier, D. Nardiello, N. C. Santos, S. G. Sousa, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Observatoire Astronomique de l'Université de Genève (ObsGE), Université de Genève = University of Geneva (UNIGE), INAF - Osservatorio Astronomico di Padova (OAPD), Istituto Nazionale di Astrofisica (INAF), Instituto de Astrofísica e Ciências do Espaço (IASTRO), European Southern Observatory (ESO), Departement Physik [ETH Zürich] (D-PHYS), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Cavendish Laboratory, University of Cambridge [UK] (CAM), Faculdade de Ciências [Lisboa], and Universidade de Lisboa = University of Lisbon (ULISBOA)
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Earth and Planetary Astrophysics (astro-ph.EP) ,stars: individual: HIP41378 ,Space and Planetary Science ,[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] ,techniques: radial velocities ,stars: activity ,FOS: Physical sciences ,Astronomy and Astrophysics ,planetary systems ,techniques: spectroscopic ,Astrophysics - Earth and Planetary Astrophysics - Abstract
The Rossiter-McLaughlin (RM) effect is a method that allows us to measure the orbital obliquity of planets, which is an important constraint that has been used to understand the formation and migration mechanisms of planets, especially for hot Jupiters. In this paper, we present the RM observation of the Neptune-sized long-period transiting planet HIP41378 d. Those observations were obtained using the HARPS-N/TNG and ESPRESSO/ESO-VLT spectrographs over two transit events in 2019 and 2022. The analysis of the data with both the classical RM and the RM Revolutions methods allows us to confirm that the orbital period of this planet is 278 days and that the planet is on a prograde orbit with an obliquity of $\lambda$ = 57.1+26.4-17.9 degrees, a value which is consistent between both methods. HIP41378 d is the longest period planet for which the obliquity was measured so far. We do not detect transit timing variations with a precision of 30 and 100 minutes for the 2019 and 2022 transits, respectively. This result also illustrates that the RM effect provides a solution to follow-up from the ground the transit of small and long-period planets such as those that will be detected by the forthcoming ESA's PLATO mission., Comment: Accepted for publication in A&A
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- 2022
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8. The young HD 73583 (TOI-560) planetary system: Two 10-M⊕ mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf
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O Barragán, D J Armstrong, D Gandolfi, I Carleo, A A Vidotto, C Villarreal D’Angelo, A Oklopčić, H Isaacson, D Oddo, K Collins, M Fridlund, S G Sousa, C M Persson, C Hellier, S Howell, A Howard, S Redfield, N Eisner, I Y Georgieva, D Dragomir, D Bayliss, L D Nielsen, B Klein, S Aigrain, M Zhang, J Teske, J D Twicken, J Jenkins, M Esposito, V Van Eylen, F Rodler, V Adibekyan, J Alarcon, D R Anderson, J M Akana Murphy, D Barrado, S C C Barros, B Benneke, F Bouchy, E M Bryant, R P Butler, J Burt, J Cabrera, S Casewell, P Chaturvedi, R Cloutier, W D Cochran, J Crane, I Crossfield, N Crouzet, K I Collins, F Dai, H J Deeg, A Deline, O D S Demangeon, X Dumusque, P Figueira, E Furlan, C Gnilka, M R Goad, E Goffo, F Gutiérrez-Canales, A Hadjigeorghiou, Z Hartman, A P Hatzes, M Harris, B Henderson, T Hirano, S Hojjatpanah, S Hoyer, P Kabáth, J Korth, J Lillo-Box, R Luque, M Marmier, T Močnik, A Muresan, F Murgas, E Nagel, H L M Osborne, A Osborn, H P Osborn, E Palle, M Raimbault, G R Ricker, R A Rubenzahl, C Stockdale, N C Santos, N Scott, R P Schwarz, S Shectman, S Seager, D Ségransan, L M Serrano, M Skarka, A M S Smith, J Šubjak, T G Tan, S Udry, C Watson, P J Wheatley, R West, J N Winn, S X Wang, A Wolfgang, C Ziegler, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Ministerio de Ciencia e Innovación (España), European Commission, European Research Council, Swiss National Science Foundation, Fondazione Cassa di Risparmio di Torino, Centre National D'Etudes Spatiales (France), and Low Energy Astrophysics (API, FNWI)
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Earth and Planetary Astrophysics (astro-ph.EP) ,Stars: activity ,Planets and satellites: individual: HD 73583 (TOI-560) ,radial velocities [Techniques] ,photometric [Techniques] ,FOS: Physical sciences ,Astronomy and Astrophysics ,Q1 ,individual: HD 73583 (TOI-560) [Planets and satellites] ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,[SDU]Sciences of the Universe [physics] ,Techniques: radial velocities ,activity [Stars] ,Solar and Stellar Astrophysics (astro-ph.SR) ,Techniques: photometric ,QB ,Astrophysics - Earth and Planetary Astrophysics - Abstract
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.--Full list of authors: Barragan, O.; Armstrong, D. J.; Gandolfi, D.; Carleo, I; Vidotto, A. A.; D'Angelo, C. Villarreal; Oklopcic, A.; Isaacson, H.; Oddo, D.; Collins, K.; Fridlund, M.; Sousa, S. G.; Persson, C. M.; Hellier, C.; Howell, S.; Howard, A.; Redfield, S.; Eisner, N.; Georgieva, I. Y.; Dragomir, D.; Bayliss, D.; Nielsen, L. D.; Klein, B.; Aigrain, S.; Zhang, M.; Teske, J.; Twicken, J. D.; Jenkins, J.; Esposito, M.; Van Eylen, V.; Rodler, F.; Adibekyan, V; Alarcon, J.; Anderson, D. R.; Murphy, J. M. Akana; Barrado, D.; Barros, S. C. C.; Benneke, B.; Bouchy, F.; Bryant, E. M.; Butler, R. P.; Burt, J.; Cabrera, J.; Casewell, S.; Chaturvedi, P.; Cloutier, R.; Cochran, W. D.; Crane, J.; Crossfield, I; Crouzet, N.; Collins, K., I; Dai, F.; Deeg, H. J.; Deline, A.; Demangeon, O. D. S.; Dumusque, X.; Figueira, P.; Furlan, E.; Gnilka, C.; Goad, M. R.; Goffo, E.; Gutierrez-Canales, F.; Hadjigeorghiou, A.; Hartman, Z.; Hatzes, A. P.; Harris, M.; Henderson, B.; Hirano, T.; Hojjatpanah, S.; Hoyer, S.; Kabath, P.; Korth, J.; Lillo-Box, J.; Luque, R.; Marmier, M.; Mocnik, T.; Muresan, A.; Murgas, F.; Nagel, E.; Osborne, H. L. M.; Osborn, A.; Osborn, H. P.; Palle, E.; Raimbault, M.; Ricker, G. R.; Rubenzahl, R. A.; Stockdale, C.; Santos, N. C.; Scott, N.; Schwarz, R. P.; Shectman, S.; Seager, S.; Segransan, D.; Serrano, L. M.; Skarka, M.; Smith, A. M. S.; Subjak, J.; Tan, T. G.; Udry, S.; Watson, C.; Wheatley, P. J.; West, R.; Winn, J. N.; Wang, S. X.; Wolfgang, A.; Ziegler, C.; KESPRINT Team., We present the discovery and characterization of two transiting planets observed by TESS in the light curves of the young and bright (V = 9.67) star HD73583 (TOI-560). We perform an intensive spectroscopic and photometric space- and ground-based follow-up in order to confirm and characterize the system. We found that HD73583 is a young (∼500 Myr) active star with a rotational period of 12.08 ± 0.11 d, and a mass and radius of 0.73 ± 0.02 M⊙ and 0.65 ± 0.02 R⊙, respectively. HD 73583 b (Pb = 6.3980420+0.0000067−0.0000062 d) has a mass and radius of 10.2+3.4−3.1 M⊕ and 2.79 ± 0.10 R⊕, respectively, which gives a density of 2.58+0.95−0.81 gcm−3. HD 73583 c (Pc = 18.87974+0.00086−0.00074 d) has a mass and radius of 9.7+1.8−1.7 M⊕ and 2.39+0.10−0.09 R⊕, respectively, which translates to a density of 3.88+0.91−0.80 gcm−3. Both planets are consistent with worlds made of a solid core surrounded by a volatile envelope. Because of their youth and host star brightness, they both are excellent candidates to perform transmission spectroscopy studies. We expect ongoing atmospheric mass-loss for both planets caused by stellar irradiation. We estimate that the detection of evaporating signatures on H and He would be challenging, but doable with present and future instruments. © The Author(s) 2022. Published by Oxford University Press on behalf of Royal Astronomical Society., This work was supported by the KESPRINT collaboration, an international consortium devoted to the characterization and research of exoplanets discovered with space-based missions (http://www.kesprint.science). We thank the referee for their helpful comments and suggestions that improved the quality of this manuscript. We acknowledge the use of public TESS data from pipelines at the TESS Science Office and at the TESS Science Processing Operations Center. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center for the production of the SPOC data products. This work uses observations from the LCOGT network. Part of the LCOGT telescope time was granted by NOIRLab through the Mid-Scale Innovations Program (MSIP). MSIP is funded by NSF. This paper is in part based on data collected under the NGTS project at the ESO La Silla Paranal Observatory. The NGTS facility is operated by the consortium institutes with support from the UK Science and Technology Facilities Council (STFC) projects ST/M001962/1 and ST/S002642/1. This research has used the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. Some of the observations in the paper used the High-Resolution Imaging instrument Zorro obtained under Gemini LLP Proposal Number: GN/S-2021A-LP-105. Zorro was funded by the NASA Exoplanet Exploration Program and built at the NASA Ames Research Center by Steve B. Howell, Nic Scott, Elliott P. Horch, and Emmett Quigley. Zorro was mounted on the Gemini North (and/or South) telescope of the international Gemini Observatory, a program of NSF’s OIR Lab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation on behalf of the Gemini partnership: the National Science Foundation (United States), National Research Council (Canada), Agencia Nacional de Investigación y Desarrollo (Chile), Ministerio de Ciencia, Tecnología e Innovación (Argentina), Ministério da Ciência, Tecnologia, Inovações e Comunicações (Brazil), and Korea Astronomy and Space Science Institute (Republic of Korea). OB, BK, and SA acknowledge that this publication is part of a project that has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 865624). DG and LMS gratefully acknowledge financial support from the Cassa di Risparmio di Torino foundation under Grant No. 2018.2323 ‘Gaseous or rocky? Unveiling the nature of small worlds’. DJA acknowledges support from the STFC via an Ernest Rutherford Fellowship (ST/R00384X/1). APH and ME acknowledges grant HA 3279/12-1 within the DFG Schwerpunkt SPP 1992, ‘Exploring the Diversity of Extrasolar Planets’. JS and PK would like to acknowledge support from MSMT grant LTT-20015. We acknowledges the support by FCT – Fundação para a Ciência e a Tecnologia through national funds and by FEDER through COMPETE2020 – Programa Operacional Competitividade e Internacionalização by these grants: UID/FIS/04434/2019; UIDB/04434/2020; UIDP/04434/2020; PTDC/FIS-AST/32113/2017 & POCI-01-0145-FEDER-032113; PTDC/FISAST /28953/2017 & POCI-01-0145-FEDER-028953. AD acknowledges the financial support of the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (project FOUR ACES; grant agreement No 724427). AD also acknowledges financial support of the the Swiss National Science Foundation (SNSF) through the National Centre for Competence in Research ‘PlanetS’. MF, IYG, JK, and CMP gratefully acknowledge the support of the Swedish National Space Agency (DNR 177/19, 174/18, 2020-00104, 65/19). FGC thanks the Mexican national council for science and technology (CONACYT, CVU-1005374). MS acknowledge financial support of the Inter-transfer grant no LTT-20015. JL-B acknowledges financial support received from ‘la Caixa’ Foundation (ID 100010434) and from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 847648, with fellowship code LCF/BQ/PI20/11760023. AAV acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 817540, ASTROFLOW). JMAM is supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1842400. JMAM acknowledges the LSSTC Data Science Fellowship Program, which is funded by LSSTC, NSF Cybertraining Grant No. 1829740, the Brinson Foundation, and the Moore Foundation; his participation in the program has benefited this work. RAR is supported by the NSF Graduate Research Fellowship, grant No. DGE 1745301. RL acknowledges financial support from the Spanish Ministerio de Ciencia e Innovación, through project PID2019-109522GB-C52, and the Centre of Excellence ‘Severo Ochoa’ award to the Instituto de Astrofísica de Andalucía (SEV-2017-0709). PC acknowledges the generous support from Deutsche Forschungsgemeinschaft (DFG) of the grant CH 2636/1-1. SH acknowledges CNES funding through the grant 837319. VA acknowledges the support from Fundação para a Ciência e Tecnologia (FCT) through Investigador FCT contract nr. IF/00650/2015/CP1273/CT0001. ODSD is supported in the form of work contract (DL 57/2016/CP1364/CT0004) funded by national funds through Fundação para a Ciência e Tecnologia (FCT). AO is supported by an STFC studentship. XD would like to acknowledge the funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement SCORE No 851555). HJD acknowledges support from the Spanish Research Agency of the Ministry of Science and Innovation (AEI-MICINN) under the grant ‘Contribution of the IAC to the PLATO Space Mission’ with reference PID2019-107061GB-C66, DOI: 10.13039/501100011033. DD acknowledges support from the TESS Guest Investigator Program grant 80NSSC19K1727 and NASA Exoplanet Research Program grant 18-2XRP18_2-0136. AO gratefully acknowledges support from the Dutch Research Council NWO Veni grant.
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- 2022
9. TOI-969: a late-K dwarf with a hot mini-Neptune in the desert and an eccentric cold Jupiter
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J. Lillo-Box, D. Gandolfi, D. J. Armstrong, K. A. Collins, L. D. Nielsen, R. Luque, J. Korth, S. G. Sousa, S. N. Quinn, L. Acuña, S. B. Howell, G. Morello, C. Hellier, S. Giacalone, S. Hoyer, K. Stassun, E. Palle, A. Aguichine, O. Mousis, V. Adibekyan, T. Azevedo Silva, D. Barrado, M. Deleuil, J. D. Eastman, A. Fukui, F. Hawthorn, J. M. Irwin, J. M. Jenkins, D. W. Latham, A. Muresan, N. Narita, C. M. Persson, A. Santerne, N. C. Santos, A. B. Savel, H. P. Osborn, J. Teske, P. J. Wheatley, J. N. Winn, S. C. C. Barros, R. P. Butler, D. A. Caldwell, D. Charbonneau, R. Cloutier, J. D. Crane, O. D. S. Demangeon, R. F. Díaz, X. Dumusque, M. Esposito, B. Falk, H. Gill, S. Hojjatpanah, L. Kreidberg, I. Mireles, A. Osborn, G. R. Ricker, J. E. Rodriguez, R. P. Schwarz, S. Seager, J. Serrano Bell, S. A. Shectman, A. Shporer, M. Vezie, S. X. Wang, G. Zhou, Ministerio de Ciencia e Innovación (España), Fundación 'la Caixa', European Commission, and European Research Council
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Earth and Planetary Astrophysics (astro-ph.EP) ,Space and Planetary Science ,Techniques: radial velocities ,Stars: individual: TOI-969 ,FOS: Physical sciences ,Astronomy and Astrophysics ,Planets and satellites: detection ,Planets and satellites: fundamental parameters ,Techniques: photometric ,Planets and satellites: composition ,Astrophysics - Earth and Planetary Astrophysics - Abstract
Full list of authors: Lillo-Box, J.; Gandolfi, D.; Armstrong, D. J.; Collins, K. A.; Nielsen, L. D.; Luque, R.; Korth, J.; Sousa, S. G.; Quinn, S. N.; Acuña, L.; Howell, S. B.; Morello, G.; Hellier, C.; Giacalone, S.; Hoyer, S.; Stassun, K.; Palle, E.; Aguichine, A.; Mousis, O.; Adibekyan, V.; Azevedo Silva, T.; Barrado, D.; Deleuil, M.; Eastman, J. D.; Fukui, A.; Hawthorn, F.; Irwin, J. M.; Jenkins, J. M.; Latham, D. W.; Muresan, A.; Narita, N.; Persson, C. M.; Santerne, A.; Santos, N. C.; Savel, A. B.; Osborn, H. P.; Teske, J.; Wheatley, P. J.; Winn, J. N.; Barros, S. C. C.; Butler, R. P.; Caldwell, D. A.; Charbonneau, D.; Cloutier, R.; Crane, J. D.; Demangeon, O. D. S.; Díaz, R. F.; Dumusque, X.; Esposito, M.; Falk, B.; Gill, H.; Hojjatpanah, S.; Kreidberg, L.; Mireles, I.; Osborn, A.; Ricker, G. R.; Rodriguez, J. E.; Schwarz, R. P.; Seager, S.; Serrano Bell, J.; Shectman, S. A.; Shporer, A.; Vezie, M.; Wang, S. X.; Zhou, G.--This is an Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited., Context. The current architecture of a given multi-planetary system is a key fingerprint of its past formation and dynamical evolution history. Long-term follow-up observations are key to complete their picture. Aims. In this paper, we focus on the confirmation and characterization of the components of the TOI-969 planetary system, where TESS detected a Neptune-size planet candidate in a very close-in orbit around a late K-dwarf star. Methods. We use a set of precise radial velocity observations from HARPS, PFS, and CORALIE instruments covering more than two years in combination with the TESS photometric light curve and other ground-based follow-up observations to confirm and characterize the components of this planetary system. Results. We find that TOI-969 b is a transiting close-in (Pb ~ 1.82 days) mini-Neptune planet (mb = 9.1−1.0+1.1 M⊕, Rb = 2.765−0.097+0.088 R⊕), placing it on the lower boundary of the hot-Neptune desert (Teq,b = 941 ± 31 K). The analysis of its internal structure shows that TOI-969 b is a volatile-rich planet, suggesting it underwent an inward migration. The radial velocity model also favors the presence of a second massive body in the system, TOI-969 c, with a long period of Pc = 1700−280+290 days, a minimum mass of mc sin ic = 11.3−0.9+1.1 MJup, and a highly eccentric orbit of ec = 0.628−0.036+0.043. Conclusions. The TOI-969 planetary system is one of the few around K-dwarfs known to have this extended configuration going from a very close-in planet to a wide-separation gaseous giant. TOI-969 b has a transmission spectroscopy metric of 93 and orbits a moderately bright (G = 11.3 mag) star, making it an excellent target for atmospheric studies. The architecture of this planetary system can also provide valuable information about migration and formation of planetary systems. © The Authors 2023., J.L-B. acknowledges financial support received from “la Caixa” Foundation (ID 100010434) and from the European Unions Horizon 2020 research and innovation programme under the Marie Slodowska-Curie grant agreement No 847648, with fellowship code LCF/BQ/PI20/11760023. This research has also been partly funded by the Spanish State Research Agency (AEI) Projects No.PID2019-107061GB-C6l and No. MDM-2017-0737 Unidad de Excelencia “Maria de Maeztu” – Centro de Astrobiología (INTA-CSIC). R.L. acknowledges financial support from the Spanish Ministerio de Ciencia e Innovación, through project PID2019-109522GB-C52, and the Centre of Excellence “Severo Ochoa” award to the Instituto de Astrofísica de Andalucía (SEV-2017-0709). DJ.A. acknowledges support from the STFC via an Ernest Rutherford Fellowship (ST/R00384X/1). S.G.S acknowledges the support from FCT through Estimulo FCT contract nr.CEECIND/00826/2018 and POPH/FSE (EC). G.M. has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 895525. S.H. acknowledges CNES funding through the grant 837319. The French group acknowledges financial support from the French Programme National de Planétologie (PNP, INSU). This work is partly financed by the Spanish Mnistry of Economics and Competitiveness through grants PGC2018-098153-B-C31. We acknowledge the support by FCT – Fundação para a Ciência e a Tecnologia through national funds and by FEDER through COMPETE2020 – Programa Operacional Competitividade e Internacionalização by these grants: UID/FIS/04434/2019; UIDB/04434/2020; UIDP/04434/2020; PTDC/FIS-AST/32113/2017 & POCI-01-0145-FEDER-032113; PTDC/FISAST/28953/2017 & POCI-01-0145-FEDER-028953. P.J.W is supported by an STFC consolidated grant (ST/T000406/1). F.H. is funded by an STFC studentship. T.A.S acknowledges support from the Fundação para a Ciência e a Tecnologia (FCT) through the Fellowship PD/BD/150416/2019 and POCH/FSE (EC). C.M.P. acknowledges support from the SNSA (dnr 65/19P). This work has been carried out within the framework of the National Centre of Competence in Research (NCCR) PlanetS supported by the Swiss National Science Foundation. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement SCORE No 851555). O.D.S.D. is supported in the form of work contract (DL 57/2016/CP1364/CT0004) funded by national funds through Fundação para a Ciência e a Tecnologia (FCT). M.E. acknowledges the support of the DFG priority programSPP 1992 “Exploring the Diversity of Extrasolar Planets” (HA 3279/12-1). A.O. is funded by an STFC studentship. J.K. gratefully acknowledge the support of the Swedish National Space Agency (SNSA; DNR 2020-00104). This work makes use of observations from the LCOGT network. This paper is based on observations made with the MuSCAT3 instrument, developed by the Astrobiology Center and under financial supports by ISPS KAKENHI (IP18H05439) and 1ST PRESTO (IPMIPR1775), at Faulkes Telescope North on Maui, HI, operated by the Las Cumbres Observatory. Some of the observations in the paper made use of the High-Resolution Imaging instrument Zorro obtained under Gemini LLP Proposal Number: GN/S-2021A-LP-105. Zorro was funded by the NASA Exoplanet Exploration Program and built at the NASA Ames Research Center by Steve B. Howell, Nie Scott, Elliott P. Horch, and Emmett Quigley. Zorro was mounted on the Gemini North (and/or South) telescope of the international Gemini Observatory, a program of NSF’s OIR Lab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. on behalf of the Gemini partnership: the National Science Foundation (United States), National Research Council (Canada), Agencia Nacional de Investigación y Desarrollo (Chile), Ministerio de Ciencia, Tecnología e Innovación (Argentina), Ministério da Ciência, Tecnologia, Inovações e Comunicações (Brazil), and Korea Astronomy and Space Science Institute (Republic of Korea). We acknowledge the use of public TESS data from pipelines at the TESS Science Office and at the TESS Science Processing Operations Center. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center for the production of the SPOC data products. The MEarth Team gratefully acknowledges funding from the David and Lucile Packard Fellowship for Science and Engineering (awarded to D.C.). This material is based upon work supported by the National Science Foundation under grants AST-0807690, AST-1109468, AST-1004488 (Alan T. Waterman Award), and AST-1616624, and upon work supported by the National Aeronautics and Space Administration under Grant No. 80NSSC18K0476 issued through the XRP Program. This work is made possible by a grant from the John Templeton Foundation. The opinions expressed in this publication are those of the authors and do not necessarily reflect the views of the John Templeton Foundation. This research made use of Astropy, (a community-developed core Python package for Astronomy, Astropy Collaboration 2013, 2018), SciPy (Virtanen et al. 2020), matplotlib (a Python library for publication quality graphics Hunter 2007), and numpy (Harris et al. 2020). This research has made use of NASA’s Astrophysics Data System Bibliographic Services. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France., With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2021-001131-S).
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- 2022
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10. Masses for the seven planets in K2-32 and K2-233
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J. Lillo-Box, T. A. Lopez, A. Santerne, L. D. Nielsen, S. C. C. Barros, M. Deleuil, L. Acuña, O. Mousis, S. G. Sousa, V. Adibekyan, D. J. Armstrong, D. Barrado, D. Bayliss, D. J. A. Brown, O. D. S. Demangeon, X. Dumusque, P. Figueira, S. Hojjatpanah, H. P. Osborn, N. C. Santos, S. Udry
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- 2020
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11. Review of pulsed power-driven high energy density physics research on Z at Sandia
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Raymond C. Clay, Brian Hutsel, P. W. Lake, Steve MacLaren, J. A. Fisher, Bernardo Farfan, S. Beatty, Ian C. Smith, James E. Bailey, J. S. Custer, R. B. Campbell, Marius Schollmeier, H. T. Barclay, Joshua J. Leckbee, Mark Kimmel, Dale Welch, J. R. Fein, Kelly Hahn, Gordon A. Chandler, Gregory Rochau, William Lewis, Michael A. Mangan, Jens Schwarz, Justin Brown, Kris Beckwith, Dawn G. Flicker, Kumar Raman, Nathan W. Moore, William D. Reinhart, Quinn Looker, Thomas A. Haill, M. J. Speir, Carlos L. Ruiz, J. D. Douglass, M. A. Schaeuble, Seth Root, J. F. Benage, M. Wu, G. Loisel, P. J. Christenson, Jack LeRoy Wise, Maurice Keith Matzen, D. J. Lucero, M. D. Mitchell, Evstati Evstatiev, Michael G. Mazarakis, P. T. Springer, Ella Suzanne Field, E. A. Weinbrecht, Clayton E. Myers, C. Aragon, C. Highstrete, P. A. Jones, C. A. McCoy, Paul Schmit, S. G. Patel, T. Gomez, S. Radovich, William A. Stygar, Ryan D. McBride, M. E. Cuneo, John P. Apruzese, John Giuliani, Timothy D. Pointon, Arati Dasgupta, Eric Harding, N. D. Hamlin, Matthias Geissel, Jonathon Shores, Kyle Robert Cochrane, M. R. Gomez, D. Spencer, John Lee McKenney, C. R. Ball, Mark Herrmann, Thomas James Awe, Patrick Knapp, J. W. Kellogg, Sakun Duwal, Christopher Jennings, A. J. Lopez, Marcus D. Knudson, R. J. Kamm, J. Ward Thornhill, Patrick K. Rambo, G. R. McKee, Christine Anne Coverdale, E.M. Campbell, Timothy McGuire Flanagan, P. Kalita, Michael P. Desjarlais, M. H. Hess, P. Gard, Kevin Baker, J.-P. Davis, Roger Alan Vesey, Tommy Ao, Thomas R. Mattsson, G. A. Shipley, A. Kreft, Raymond W. Lemke, G. S. Dunham, David Yager-Elorriaga, Matthew Martin, G. Natoni, R. J. Leeper, Brian Stoltzfus, D. J. Ampleford, Aaron Edens, C. Tyler, P. E. Wakeland, Taisuke Nagayama, Drew Johnson, E. B. Christner, Rudolph J. Magyar, G. T. Leifeste, Timothy J. Webb, D. Sandoval, D. V. Rose, M. C. Jones, D. Headley, Andrew Baczewski, Derek C. Lamppa, Sean Simpson, Adam B Sefkow, Kevin N. Austin, B. A. Branch, P. E. Specht, Kyle Peterson, Daniel Sinars, George Laity, M. D. Christison, Harry McLean, A. M. Steiner, M. D. Furnish, S. A. Lewis, A. J. Harvey-Thompson, Benjamin R. Galloway, Edmund Yu, W. L. Langston, K. Chandler, D. G. Chacon, A. R. Miles, C. S. Alexander, M. J. Edwards, A. Yu, Christopher Jay Bourdon, M. R. Weis, J. H. Hammer, Brent Manley Jones, B. M. Cook, Luke Shulenburger, J. A. Mills, S. A. Slutz, Anthony P. Colombo, A. J. Maurer, Karen Blaha, Gary Grim, Kate Bell, C. S. Speas, Christopher T Seagle, Nichelle Bennett, John L. Porter, Daniel H. Dolan, H. L. Hanshaw, M. A. Sweeney, T. A. Gardiner, J. J. Boerner, David B. Seidel, M. E. Sceiford, Jose A. Torres, Stephanie Hansen, Mark E. Savage, Daniel Ruiz, Andrew Porwitzky, D. J. Armstrong, O. Johns, A. C. Owen, Mark D. Johnston, Omar Hurricane, J. S. Lash, K. R. LeChien, David E. Bliss, Michael E. Glinsky, Joshua P. Townsend, Dean C. Rovang, G. K. Robertson, and Mark L. Kiefer
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Physics ,Nuclear engineering ,Electric potential energy ,Plasma ,Pulsed power ,Radiation ,Condensed Matter Physics ,01 natural sciences ,010305 fluids & plasmas ,law.invention ,Capacitor ,law ,0103 physical sciences ,Current (fluid) ,010306 general physics ,Inertial confinement fusion ,Energy (signal processing) - Abstract
Pulsed power accelerators compress electrical energy in space and time to provide versatile experimental platforms for high energy density and inertial confinement fusion science. The 80-TW “Z” pulsed power facility at Sandia National Laboratories is the largest pulsed power device in the world today. Z discharges up to 22 MJ of energy stored in its capacitor banks into a current pulse that rises in 100 ns and peaks at a current as high as 30 MA in low-inductance cylindrical targets. Considerable progress has been made over the past 15 years in the use of pulsed power as a precision scientific tool. This paper reviews developments at Sandia in inertial confinement fusion, dynamic materials science, x-ray radiation science, and pulsed power engineering, with an emphasis on progress since a previous review of research on Z in Physics of Plasmas in 2005.
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- 2020
12. The determination of isolated soybean protein in raw and pasteurized meat products
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Susan M. Riemann, D. J. Armstrong, and S. H. Richert
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Detection limit ,Gel electrophoresis ,Chemistry ,Sodium ,food and beverages ,chemistry.chemical_element ,Pasteurization ,Isolated Soy Protein ,Industrial and Manufacturing Engineering ,law.invention ,law ,Soybean protein ,Food science ,Soy protein ,Food Science - Abstract
Summary Sodium dodecyl sulfate-polyacrylamide gel electrophoresis was used to determine the isolated soy protein content in raw and pasteurized meat products. This method determined soy protein (±0.5%) by using an internal standard protein (haemocyanin) to compensate for variations in the meat. The detection limit for meat products was 0.5%. Several possible meat and non-meat interferences were examined and none were found to interfere. The assay cannot be used on retorted products.
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- 2007
13. Two-atom Rydberg blockade using direct 6StonPexcitation
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Andrew J. Landahl, Grant Biedermann, D. J. Armstrong, Y. Y. Jau, L. P. Parazzoli, C. W. Chou, and Aaron Hankin
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Physics ,Quantum decoherence ,Atomic and Molecular Physics, and Optics ,symbols.namesake ,Coherent control ,Electric field ,Rydberg atom ,Atom ,Rydberg formula ,symbols ,Physics::Atomic Physics ,Atomic physics ,Rydberg state ,Excitation - Abstract
We explore a single-photon approach to Rydberg state excitation and Rydberg blockade. Using detailed theoretical models, we show the feasibility of direct excitation, predict the effect of background electric fields, and calculate the required interatomic distance to observe Rydberg blockade. We then measure and control the electric field environment to enable coherent control of Rydberg states. With this coherent control, we demonstrate Rydberg blockade of two atoms separated by 6.6(3) $\ensuremath{\mu}$m. When compared with the more common two-photon excitation method, this single-photon approach is advantageous because it eliminates channels for decoherence through photon scattering and ac Stark shifts from the intermediate state while moderately increasing Doppler sensitivity.
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- 2014
14. K2-29 b/WASP-152 b: AN ALIGNED AND INFLATED HOT JUPITER IN A YOUNG VISUAL BINARY
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A. Santerne, G. Hébrard, J. Lillo-Box, D. J. Armstrong, S. C. C. Barros, O. Demangeon, D. Barrado, A. Debackere, M. Deleuil, E. Delgado Mena, M. Montalto, D. Pollacco, H. P. Osborn, S. G. Sousa, L. Abe, V. Adibekyan, J.-M. Almenara, P. André, G. Arlic, G. Barthe, P. Bendjoya, R. Behrend, I. Boisse, F. Bouchy, H. Boussier, M. Bretton, D. J. A. Brown, B. Carry, A. Cailleau, E. Conseil, G. Coulon, B. Courcol, B. Dauchet, J.-C. Dalouzy, M. Deldem, O. Desormières, P. Dubreuil, J.-M. Fehrenbach, S. Ferratfiat, R. Girelli, J. Gregorio, S. Jaecques, F. Kugel, J. Kirk, O. Labrevoir, J.-C. Lachurié, K. W. F. Lam, P. Le Guen, P. Martinez, L. P. A. Maurin, J. McCormac, J-B. Pioppa, U. Quadri, A. Rajpurohit, J. Rey, J.-P. Rivet, R. Roy, N. C. Santos, F. Signoret, L. Strabla, O. Suarez, D. Toublanc, M. Tsantaki, J.-M. Vienney, P. A. Wilson, M. Bachschmidt, F. Colas, O. Gerteis, P. Louis, J.-C. Mario, C. Marlot, J. Montier, V. Perroud, V. Pic, D. Romeuf, S. Ubaud, D. Verilhac, Centro de Astrofísica da Universidade do Porto (CAUP), Universidade do Porto = University of Porto, Institut d'Astrophysique de Paris (IAP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Virologia, Laboratorio Nacional de Investigacao Veterinaria (LNIV), Université Paris-Sud - Paris 11 (UP11), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Departamento de Astrofisica [Madrid], Centro de Astrobiologia [Madrid] (CAB), Instituto Nacional de Técnica Aeroespacial (INTA)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Instituto Nacional de Técnica Aeroespacial (INTA)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Calar Alto Observatory, Centro Astronómico Hispano-Alemán, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Instituto de Astrofisica de Canarias (IAC), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Geneva Observatory, University of Geneva [Switzerland], CdR & CdL group, Observatoire de Haute-Provence (OHP), Institut Pythéas (OSU PYTHEAS), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Centre National de la Recherche Scientifique (CNRS), Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Observatoire Chante-Perdrix, School of Physics and Astronomy [Cardiff], Cardiff University, Hôpital Européen Georges Pompidou [APHP] (HEGP), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Hôpitaux Universitaires Paris Ouest - Hôpitaux Universitaires Île de France Ouest (HUPO), UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Département RadioChimie et Procédés (DRCP), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Laval [Québec] (ULaval), Departamento de Física e Astronomia [Porto] (DFA/FCUP), Faculdade de Ciências da Universidade do Porto (FCUP), Universidade do Porto = University of Porto-Universidade do Porto = University of Porto, Centre d'étude spatiale des rayonnements (CESR), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Université Fédérale Toulouse Midi-Pyrénées-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Courbes de rotation d'astéroïdes, de comètes et d'étoiles variables (CdR & CdL group), Universidade do Porto [Porto], Instituto Nacional de Técnica Aeroespacial (INTA)-Consejo Superior de Investigaciones Científicas [Spain] (CSIC)-Instituto Nacional de Técnica Aeroespacial (INTA)-Consejo Superior de Investigaciones Científicas [Spain] (CSIC), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Université Côte d'Azur (UCA), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut de Recherche pour le Développement (IRD), PSL Research University (PSL)-PSL Research University (PSL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), School of Physics and Astronomy, Assistance publique - Hôpitaux de Paris (AP-HP) (APHP)-Hôpitaux Universitaires Paris Ouest - Hôpitaux Universitaires Île de France Ouest (HUPO), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Laval, Departamento de Física e Astronomia [Porto], Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centro de Astrofísica da Universidade do Porto ( CAUP ), Institut d'Astrophysique de Paris ( IAP ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), Université Paris-Sud - Paris 11 ( UP11 ), Institut d'astrophysique spatiale ( IAS ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), LAEX, Depto. Astrofísica, Centro de Astrobiología, Laboratoire d'Astrophysique de Marseille ( LAM ), Aix Marseille Université ( AMU ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National d'Etudes Spatiales ( CNES ) -Centre National de la Recherche Scientifique ( CNRS ), Joseph Louis LAGRANGE ( LAGRANGE ), Université Nice Sophia Antipolis ( UNS ), Université Côte d'Azur ( UCA ) -Université Côte d'Azur ( UCA ) -Observatoire de la Côte d'Azur, Université Côte d'Azur ( UCA ) -Centre National de la Recherche Scientifique ( CNRS ), Instituto de Astrofisica de Canarias ( IAC ), Astrophysique Interactions Multi-échelles ( AIM - UMR 7158 - UMR E 9005 ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Paris Diderot - Paris 7 ( UPD7 ), Université Côte d'Azur ( UCA ), Observatoire de Haute-Provence ( OHP ), Institut Pythéas ( OSU PYTHEAS ), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture ( IRSTEA ) -Institut de Recherche pour le Développement ( IRD ) -Aix Marseille Université ( AMU ) -Centre National de la Recherche Scientifique ( CNRS ) -Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture ( IRSTEA ) -Institut de Recherche pour le Développement ( IRD ) -Aix Marseille Université ( AMU ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Mécanique Céleste et de Calcul des Ephémérides ( IMCCE ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Observatoire de Paris-Université de Lille-Centre National de la Recherche Scientifique ( CNRS ), School of Physis & Astronomy, Hôpital Européen Georges Pompidou [APHP] ( HEGP ), UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux ( EPOC ), Observatoire aquitain des sciences de l'univers ( OASU ), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ) -École pratique des hautes études ( EPHE ) -Centre National de la Recherche Scientifique ( CNRS ), Département RadioChimie et Procédés ( DRCP ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Centre d'étude spatiale des rayonnements ( CESR ), Université Toulouse III - Paul Sabatier ( UPS ), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers ( INSU - CNRS ) -Observatoire Midi-Pyrénées ( OMP ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire d'études spatiales et d'instrumentation en astrophysique ( LESIA ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ), Courbes de rotation d'astéroïdes, de comètes et d'étoiles variables ( CdR & CdL group ), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Université de Genève = University of Geneva (UNIGE), Environnements et Paléoenvironnements OCéaniques (EPOC), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Universidade do Porto, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Universidade do Porto-Universidade do Porto, Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées
- Subjects
Physics ,010308 nuclear & particles physics ,[ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph] ,Stellar rotation ,Astronomy ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Radius ,01 natural sciences ,Stars ,Space and Planetary Science ,Planet ,0103 physical sciences ,Hot Jupiter ,Magnitude (astronomy) ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Transit (astronomy) ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,QB ,Visual binary - Abstract
International audience; In the present paper we report the discovery of a new hot Jupiter, K2-29 b, first detected by the Super-WASP observatory and then by the K2 space mission during its campaign 4. The planet has a period of 3.25 days, a mass of 0.73 +/- 0.04M(sic), and a radius of 1.19 +/- 0.02 R(sic). The host star is a relatively bright (V = 12.5) G7 dwarf with a nearby K5V companion. Based on stellar rotation and the abundance of lithium, we find that the system might be as young as similar to 450 Myr. The observation of the Rossiter-McLaughlin effect shows that the planet is aligned with respect to the stellar spin. Given the deep transit (20 mmag), the magnitude of the star and the presence of a nearby stellar companion, the planet is a good target for both space- and ground-based transmission spectroscopy, in particular in the near-infrared where both stars are relatively bright.
- Published
- 2016
15. Non-peptide glycoprotein IIb/IIIa inhibitors. 6. Design and synthesis of rigid, centrally constrained non-peptide fibrinogen receptor antagonists
- Author
-
David A. Claremon, Charles J. Mcintyre, Robert J. Gould, B. C. Askew, D. J. Armstrong, R. J. Lynch, and Hunt Cecilia
- Subjects
Bicyclic molecule ,Platelet aggregation ,Fibrinogen receptor ,Chemistry ,Organic Chemistry ,Clinical Biochemistry ,Pharmaceutical Science ,Selective antagonist ,Biochemistry ,Non peptide ,Pyrrolopiperazinone ,Glycoprotein IIb/IIIa inhibitors ,Drug Discovery ,medicine ,Molecular Medicine ,Molecular Biology ,medicine.drug - Abstract
Low molecular weight non-peptide inhibitors of platelet aggregation based on rigid bicyclic scaffolds are described. Consideration of the reported conformational preferences of 1-alkyl-3-carbonyl pyrroles led to the synthesis of pyrrolopiperazinone 2a which was shown to be a potent, selective antagonist.
- Published
- 1995
16. ChemInform Abstract: Non-Peptide Glycoprotein IIb/IIIa Inhibitors. Part 6. Design and Synthesis of Rigid, Centrally Constrained Non-Peptide Fibrinogen Receptor Antagonists
- Author
-
R. J. Lynch, B. C. Askew, Charles J. Mcintyre, Hunt Cecilia, David A. Claremon, Robert J. Gould, and D. J. Armstrong
- Subjects
Fibrinogen receptor ,Chemistry ,Stereochemistry ,Glycoprotein IIb/IIIa inhibitors ,medicine ,General Medicine ,Non peptide ,medicine.drug - Published
- 2010
17. ChemInform Abstract: Nonpeptide Glycoprotein IIb/IIIa Inhibitors: Substituted Quinazolinediones and Quinazolinones as Potent Fibrinogen Receptor Antagonists
- Author
-
R. J. Lynch, John J. Baldwin, Remy David C, David A. Claremon, D. J. Armstrong, Nigel J. Liverton, Robert J. Gould, and Guixiang Zhang
- Subjects
Fibrinogen receptor ,Chemistry ,Glycoprotein IIb/IIIa inhibitors ,medicine ,General Medicine ,Pharmacology ,medicine.drug - Published
- 2010
18. The effect of phenobarbitone administration on sialyltransferase activity and fibrinogen bound sialic acid in rats
- Author
-
D. J. Armstrong, J.L. Francis, and V.J. Simmonds
- Subjects
Male ,Fibrinogen ,Hematology ,Liver regeneration ,Sialyltransferase activity ,N-Acetylneuraminic Acid ,Sialyltransferases ,Sialic acid ,Liver Regeneration ,Rats ,chemistry.chemical_compound ,Biochemistry ,chemistry ,Liver ,Phenobarbital ,medicine ,Animals ,Rats, Wistar ,medicine.drug ,Protein Binding - Published
- 2010
19. SHELF-LIFE EXTENSION AND SAFETY CONCERNS ABOUT FRESH FISHERY PRODUCTS PACKAGED UNDER MODIFIED ATMOSPHERES: A REVIEW
- Author
-
N.R. Reddy, E. J. Rhodehamel, D. J. Armstrong, and Donald A. Kautter
- Subjects
Spoilage bacteria ,Controlled atmosphere ,fungi ,Food preservation ,Shelf life ,Microbiology ,Warehouse ,Fishery ,Foodborne Botulism ,Modified atmosphere ,Food microbiology ,Environmental science ,Parasitology ,Food science ,Food Science - Abstract
Shelf-life and quality of fresh fishery products can be extended by the use of a modified atmosphere (MA) and high barrier film packaging coupled with refrigerated storage. MAs with elevated levels of carbon dioxide inhibit or slow the growth of various aerobic spoilage bacteria of fishery products by extending the lag phase. However, at the same time, MAs provide conditions for the growth of Grampositive bacteria and food pathogens within the package. The extension of the storage life of the refrigerated MA products may enable the slower-growing Gram-positive bacteria to reach high populations. The shelf-life of fishery products packaged under MAs rich in carbon dioxide coupled with storage at 8.0°C or below can be extended more than 100%. Major safety concerns regarding the risk of foodborne botulism can result from MA packaging of fresh fishery products that contain the spores of nonproteolytic C. botulinum and are subsequently temperature-abused. Minimizing the risk of foodborne botulism by including inhibitory factors such as antimicrobial agents before packaging fishery products under MAs and strict adherence to refrigerated storage temperatures are discussed.
- Published
- 1991
20. Demonstration of a frequency-modulated, pulsed optical parametric oscillator
- Author
-
D. J. Armstrong and A. V. Smith
- Subjects
Optical pumping ,Optics ,Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,Modulation ,Optical parametric oscillator ,Parametric oscillator ,Optical modulation amplitude ,business ,Absorption (electromagnetic radiation) ,Frequency modulation ,Optical parametric amplifier - Abstract
We demonstrate that injection seeding a pulsed optical parametric oscillator with frequency modulated cw light with a modulation period equal to the cavity round-trip time produces pulses that have the same modulated character as the seed. A sensitivity of 10−3 was demonstrated for these pulses in frequency-modulated absorption measurements.
- Published
- 1997
21. Distinctive effects of G-CSF, GM-CSF and TNFalpha on neutrophil apoptosis in systemic lupus erythematosus
- Author
-
D J, Armstrong, E M, Whitehead, A D, Crockard, and A L, Bell
- Subjects
Adult ,Aged, 80 and over ,Neutrophils ,Tumor Necrosis Factor-alpha ,Health Status ,Granulocyte-Macrophage Colony-Stimulating Factor ,Apoptosis ,Cell Count ,Middle Aged ,Severity of Illness Index ,Arthritis, Rheumatoid ,Granulocyte Colony-Stimulating Factor ,Humans ,Lupus Erythematosus, Systemic ,Female ,Cells, Cultured ,Aged - Abstract
To investigate the influence of culture with G-CSF GM-CSF and TNFalpha on neutrophil apoptosis, comparing neutrophils from SLE patients with rheumatoid arthritis (RA) patients and healthy control subjects.Neutrophils were isolated from SLE (n= 10), RA (n= 10) and healthy control subjects (n= 10), and cultured with two different concentrations of G-CSF, GM-CSF and TNFalpha. Proportion of apoptotic neutrophils at T=0, T=2hrs and T=24hrs was measured using FITC-labelled annexinV and flow cytometry.Significantly more neutrophils were apoptotic at T=0 in the SLE subjects than in the other groups (median, range--Control 3.5% (0.3-7.9) SLE 9.5% (2.9-29.1) RA 3.0% (0.4-23.0) p0.05). Following culture for 24 hours with 1ng/ml G-CSF the proportion of apoptotic neutrophils from SLE subjects was significantly increased (median, range = 51.6% (27.0-84.0) without G-CSF v 66.8% (31.8-89.2) with G-CSF p0.05). This was not observed with RA or control subjects, in whom the trend was towards inhibition of apoptosis. Similar trends were seen with GM-CSF There was significant induction of apoptosis in SLE neutrophils after 2 hr culture with 1ng/ml TNFalpha (median, range = 2.3% (0.1-8.0) without TNFalpha v 5.2% (1.0-22.4) with TNFalpha). No significant change was seen in the other groups. There was an inverse correlation between total neutrophil count and the degree of induction of apoptosis by G-CSF and GM-CSF, determined at a range of time-points and cytokine concentrationsNeutrophils from SLE patients display resistance to the apoptosis-inhibiting effects of G-CSF and possibly GM-CSF, and appear more susceptible to the apoptosis-inducing action of TNFalpha, the greatest resistance being observed in the more neutropenic patients.
- Published
- 2005
22. Active systemic lupus erythematosus successfully treated with Rituximab and oral steroid
- Author
-
D J, Armstrong, S A, Wright, M B, Finch, A J, Taggart, and A L, Bell
- Subjects
Adult ,Male ,Antibodies, Monoclonal, Murine-Derived ,Antirheumatic Agents ,Antibodies, Monoclonal ,Humans ,Lupus Erythematosus, Systemic ,Antineoplastic Agents ,Drug Therapy, Combination ,Female ,Steroids ,Middle Aged ,Rituximab - Published
- 2005
23. The use of over-the-counter preparations by drug users attending an addiction treatment unit
- Author
-
D. J. Armstrong
- Subjects
Drug ,Psychotropic Drugs ,medicine.medical_specialty ,Substance-Related Disorders ,business.industry ,Incidence ,media_common.quotation_subject ,Medicine (miscellaneous) ,Nonprescription Drugs ,Unit (housing) ,Psychiatry and Mental health ,Cross-Sectional Studies ,England ,medicine ,Humans ,Over-the-counter ,Substance Abuse Treatment Centers ,Substance Abuse, Intravenous ,Psychiatry ,business ,Addiction treatment ,media_common - Published
- 1992
24. Systemic vasculitis and aneurysm formation in the Wiskott-Aldrich syndrome
- Author
-
P K Ellis, W G McCluggage, D R McCluskey, R J Maxwell, and D J Armstrong
- Subjects
Adult ,Male ,Vasculitis ,medicine.medical_specialty ,medicine.medical_treatment ,macromolecular substances ,Hepatic Veins ,Kidney ,Pathology and Forensic Medicine ,Aneurysm ,Hepatic Artery ,Laparotomy ,Necrotizing Vasculitis ,medicine ,Humans ,business.industry ,Vascular disease ,General Medicine ,Bleed ,medicine.disease ,Nephrectomy ,Surgery ,Wiskott-Aldrich Syndrome ,Radiography ,business ,Systemic vasculitis ,Research Article - Abstract
A 24 year old male who suffered from the Wiskott-Aldrich syndrome developed intra-abdominal bleeding on two occasions. Radiological investigations showed aneurysmal dilatation of branches of the hepatic and superior mesenteric arteries. The second abdominal bleed necessitated laparotomy and the bleeding was localised to the kidneys. Right nephrectomy was performed and histological examination showed a necrotising vasculitis, mainly involving medium and small sized renal blood vessels. Steroids, immunosuppressive treatment, and control of blood pressure resulted in resolution of the vasculitic process and prevented further haemorrhage. Vasculitis and aneurysm formation are rarely described complications of Wiskott-Aldrich syndrome and may account for the life threatening haemorrhage which occurs in this condition.
- Published
- 1999
25. Celecoxib and CVS risk--lessons from the APC and PreSAP studies
- Author
-
D. J. Armstrong
- Subjects
Adenoma ,Oncology ,Sulfonamides ,medicine.medical_specialty ,business.industry ,Anti-Inflammatory Agents, Non-Steroidal ,MEDLINE ,Rheumatology ,Cardiovascular Diseases ,Celecoxib ,Internal medicine ,medicine ,Humans ,Pyrazoles ,Pharmacology (medical) ,Colorectal Neoplasms ,business ,medicine.drug - Published
- 2006
26. Timing of DAS28 in infliximab therapy
- Author
-
Ian N. Bruce and D. J. Armstrong
- Subjects
Infliximab therapy ,medicine.medical_specialty ,Text mining ,Rheumatology ,business.industry ,medicine ,Pharmacology (medical) ,Intensive care medicine ,business - Published
- 2005
27. Human papillomavirus type 6 E7 protein is a substrate in vitro of protein kinase C
- Author
-
A Roman and D J Armstrong
- Subjects
Papillomavirus E7 Proteins ,Recombinant Fusion Proteins ,Molecular Sequence Data ,Sequence Homology ,Biochemistry ,MAP2K7 ,Substrate Specificity ,Amino Acid Sequence ,Threonine ,Phosphorylation ,Protein kinase A ,Molecular Biology ,Papillomaviridae ,Protein kinase C ,Protein Kinase C ,chemistry.chemical_classification ,Base Sequence ,Chemistry ,virus diseases ,Cell Biology ,Oncogene Proteins, Viral ,Molecular biology ,In vitro ,female genital diseases and pregnancy complications ,Amino acid ,Phosphothreonine ,Mutagenesis, Site-Directed ,Casein kinase 2 ,Research Article - Abstract
The E7 proteins of ‘low-risk’ and ‘high-risk‘ human papillomaviruses (HPV) are phosphorylated by casein kinase II. In this study, we report that the ‘low-risk’ HPV 6 E7 protein, but not the ‘high-risk’ HPV 16 E7 protein, can be phosphorylated in vitro on threonine at amino acid position 7 by protein kinase C. This is the first example of a qualitative biochemical difference between the HPV 6 E7 and HPV 16 E7 proteins.
- Published
- 1995
28. Reduced-fat cheese: regulations and definitions
- Author
-
D J, Armstrong and N H, Rainey
- Subjects
Cheese ,United States Food and Drug Administration ,Taste ,Food Technology ,Humans ,Diet, Fat-Restricted ,Lipids ,United States - Published
- 1995
29. Barium autoionizing states in dc electric fields near the second ionization threshold
- Author
-
D. J. Armstrong, R. P. Wood, and S. J. Smith
- Abstract
Experimental measurements of the autoionizing spectrum of barium in dc electric fields are presented. The experiments are performed with two pulsed dye lasers, which are used to populate and photoionize the doubly excited 5d6p3D1 state. The photo ion signal is monitored while the ionizing laser frequency is scanned across a field ionization threshold lying below the second (zero-field) ionization threshold. Of particular interest is the investigation of doubly excited states that lie near the second ionization threshold in a dc electric field when the zero field autoionization rate and the field ionization rate are comparable. These experimental results will be compared with theoretical calculations now in progress. The theoretical results are obtained from R-matrix eigenchannel calculations combined with a multichannel quantum defect theory (MQDT) treatment. A frame transformation theory1 is used to calculated amplitudes and phases of hydrogen-Stark wave functions that provide the asymptotic boundary conditions used in the MQDT treatment.
- Published
- 1992
30. Isolation and identification of four cytokinins from wheat germ transfer ribonucleic acid
- Author
-
Sidney M. Hecht, N J Leonard, W J Burrows, J Occolowitz, F Skoog, M Kaminek, L G Dammann, R. M. Bock, and D J Armstrong
- Subjects
Ultraviolet Rays ,Chemistry ,Spectrum Analysis ,RNA ,Wheat germ ,Kinins ,Acetates ,Isolation (microbiology) ,Biochemistry ,Molecular biology ,RNA, Transfer ,Transfer RNA ,Chromatography, Gel ,Spectrum analysis ,Triticum - Published
- 1970
31. Creep, Stress-Relaxation, and Metallurgical Properties of Steels for Steam Power Plant Operating with Steam Temperatures above 950 Deg. F. (510 Deg. C.)
- Author
-
M. F. Day, A. I. Smith, E. A. Jenkinson, and D. J. Armstrong
- Subjects
Materials science ,Creep stress ,Metallurgy ,General Engineering ,Relaxation (physics) ,Steam-electric power station - Published
- 1957
32. Creep and Rupture Properties of Carbon Steels
- Author
-
E. A. Jenkinson, A. I. Smith, and D. J. Armstrong
- Subjects
Materials science ,chemistry ,Silicon ,Creep ,Aluminium ,Metallurgy ,General Engineering ,chemistry.chemical_element ,Manganese ,Ductility ,Carbon - Abstract
In earlier N.P.L. work on the strength of carbon steels at high temperatures, steels showing ‘normal’ and ‘abnormal’ creep properties were assessed from tests extending to 1000 hours. Further results on the same steels indicate that the order of merit of these particular steels is not altered in tests extending to 100 000 hours. The rupture properties of carbon steels are reviewed in the light of the N.P.L. results and other published data. A wide range of strength properties is shown to exist. The pattern of results, however, appears reasonably consistent. At the lower end of the strength scale are almost pure irons and at the upper end are steels of moderate carbon content and not low in manganese and silicon. Heavy deoxidation with aluminium of conventional carbon steels results in lower creep and rupture properties than are observed in similar steels deoxidized with silicon; the part played by nitrogen in this effect is considered. The rupture ductility of carbon steels is discussed and in the types covered by the N.P.L. researches, low ductility in long-time service appears unlikely. Further work required in this field is considered and the need for long-time, low-strain creep properties of mild steels for use in nuclear power plants is emphasized.
- Published
- 1960
33. INFORMAL DISCUSSION. CRITICAL PATH ANALYSIS IN THE MANAGEMENT OF CONSTRUCTION PROJECTS
- Author
-
D J Armstrong
- Subjects
Engineering ,Operations research ,business.industry ,Path (graph theory) ,Control (management) ,Systems engineering ,General Medicine ,business ,Critical path method - Published
- 1964
34. Hypothesis concerning the mechanism of auxin action
- Author
-
D J Armstrong
- Subjects
Genetics ,chemistry.chemical_classification ,Multidisciplinary ,Indoleacetic Acids ,Chemistry ,In Vitro Techniques ,Plants ,Plant Growth Regulators ,Action (philosophy) ,Auxin ,RNA ,RNA biosynthesis ,Neuroscience ,Mechanism (sociology) ,Research Article ,Plant Proteins - Published
- 1966
35. Methemoglobinemia
- Author
-
D J, Armstrong
- Subjects
Methylene Blue ,Erythrocytes ,Humans ,Methemoglobinemia - Published
- 1983
36. Cytokinin structure-activity relationships and the metabolism of N-(delta-isopentenyl)adenosine-8-C in phaseolus callus tissues
- Author
-
M C, Mok, D W, Mok, S C, Dixon, D J, Armstrong, and G, Shaw
- Subjects
fungi ,food and beverages ,Articles - Abstract
The activities of the free base and ribonucleoside forms of cytokinins bearing saturated and unsaturated N(6)-isoprenoid side chains have been examined in callus cultures derived from Phaseolus vulgaris cv. Great Northern, P. lunatus cv. Kingston, and the interspecific hybrid Great Northern x Kingston. In callus of cv. Great Northern, cytokinins bearing saturated side chains (N(6)-isopentyladenine, N(6)-isopentyladenosine, dihydrozeatin, and ribosyldihydrozeatin) were always more active than the corresponding unsaturated analogs (N(6)-[Delta(2)-isopentenyl]adenine, N(6)-[Delta(2)-isopentenyl]adenosine, zeatin, and ribosylzeatin). In callus of cv. Kinston, the cytokinins bearing unsaturated side chains were either more active or equally as active as the saturated compounds. These differences in cytokinin structure-activity relationships were correlated with differences in the metabolism of (14)C-N(6)-(Delta(2)-isopentenyl)adenosine. In Great Northern tissues, this cytokinin was rapidly degraded to adenosine; in Kingston tissues, the major metabolite was the corresponding nucleotide. The growth responses of callus of the interspecific hybrid were intermediate between the parental tissues, and the metabolism of (14)C-N(6)-(Delta(2)-isopentenyl)adenosine by the hybrid callus exhibited characteristics of both parental tissues. The results are consistent with the hypothesis that the weak activity of cytokinins with unsaturated side chains in promoting the growth of Great Northern callus is due to the rapid conversion of these cytokinins to inactive metabolites.
- Published
- 1982
37. The effect of sodium citrate on fibrin polymerisation in patients with liver disease
- Author
-
D. J. Armstrong, J.L. Francis, V.J. Simmonds, and N. J. Watson
- Subjects
chemistry.chemical_compound ,Liver disease ,biology ,chemistry ,Sodium citrate ,biology.protein ,medicine ,In patient ,Pharmacology ,medicine.disease ,Fibrin - Published
- 1985
38. Acquired dysfibrinogenaemia in liver disease
- Author
-
D J Armstrong and J L Francis
- Subjects
Adult ,medicine.medical_specialty ,Cirrhosis ,Jaundice ,Fibrinogen ,Gastroenterology ,Pathology and Forensic Medicine ,Diagnosis, Differential ,Liver disease ,Cholestasis ,Internal medicine ,Medicine ,Humans ,Blood coagulation test ,medicine.diagnostic_test ,business.industry ,Liver Diseases ,General Medicine ,Blood Coagulation Disorders ,medicine.disease ,Liver function ,Blood Coagulation Tests ,medicine.symptom ,business ,Liver function tests ,medicine.drug ,Research Article - Abstract
Using a new and sensitive screening method, dysfibrinogenaemia (DF) was detected in 76% of patients with cirrhosis, 78% with chronic active liver disease and 86% with acute liver failure. The incidence was much lower in obstructive jaundice (8%) and miscellaneous liver disorders (4%). It is concluded that the fibrin monomer polymerisation (FMP) ratio test is a simple and sensitive test for the detection of DF, and is useful in the differential diagnosis of hepatocellular and obstructive jaundice. Hyperfibrinogenaemia, particularly in patients with obstructive jaundice, may explain the high incidence of abnormal thrombin and Reptilase clotting times despite normal FMP ratios. Dysfibrinogenaemia dose not appear to be related to the degree of liver function impairment, but may be associated with regeneration of hepatic tissue.
- Published
- 1982
39. An analysis of five serine transfer ribonucleic acids from Drosophila
- Author
-
B N, White, R, Dunn, I, Gillam, G M, Tener, D J, Armstrong, F, Skoog, C R, Frihart, and N J, Leonard
- Subjects
Adenosine ,Drosophila melanogaster ,Base Sequence ,RNA, Transfer ,Serine ,Animals ,Spectrophotometry, Ultraviolet ,Ribonucleosides ,Chromatography, Ion Exchange ,Mass Spectrometry - Abstract
Crude tRNA from adult Drosophila melanogaster was fractionated on bensoylated-diethylaminoethyl cellulose columns. The eluate was assayed for both amino acid acceptance and cytokinin activity. Most of the cytokinin activity was associated with a peak of serine acceptance. The five major serine tRNAs were purified by chromatography on benzoylated-dietyhlaminoethyl cellulose and reversed phase chromatography-5 columns. The major species, tRNA7-Ser was isolated from this tRNA and was shown to be N-6-(delta-2-isopentenyl)adenosine (i-6A) on the basis of ultraviolet and mass spectral data. The nucleoside somposition of all five serine tRNAs was determined directly and by the 3-H derivative method. They all contain pseudouridine, ribothymidine, 1-methyladenosine, 5-methylcytosine, N-2-dimethylguanosine, 5, 6-hydrouridine, and 3-methylcytosine, while two contain an unidentified nucleoside, and one containes 1-methylguanosine. These techniques also confirmed the presence of i-6A in tRNA7-Ser as well as showing its presence in tRNA6-Ser and tRNA4-Ser. These three tRNA-Ser species exhibit marked changes in elution from reversed phase chromatography-5 columns as a function of temperature and this may be related to their minor base composition. The tRNAs-Ser were bound to ribosomes in response to the following triplets: tRNA2-Ser, AGU, AGC; tRNA4-Ser, UCG; tRNA5-Ser, AGU, AGC; tRNA7-Ser, UCG.
- Published
- 1975
40. Accessibility of pulmonary stretch receptors from the pulmonary and bronchial circulations
- Author
-
J C Luck and D J Armstrong
- Subjects
medicine.medical_specialty ,Pulmonary Circulation ,Physiology ,business.industry ,Action Potentials ,Bronchial Arteries ,Injections ,Veratrine ,Pulmonary stretch receptors ,Physiology (medical) ,Internal medicine ,Cardiology ,Cats ,Medicine ,Animals ,Heart Atria ,business ,Lung ,Mechanoreceptors - Published
- 1974
41. Proceedings: Accessibility of pulmonary stretch receptors to drugs from the pulmonary and bronchial circulations of the cat
- Author
-
D J, Armstrong and J C, Luck
- Subjects
Veratrine ,Pulmonary Circulation ,Pulmonary Stretch Receptors ,Cats ,Animals ,Bronchi ,Heart Atria ,Lung ,Mechanoreceptors - Published
- 1974
42. Acquired dysfibrinogenaemia
- Author
-
J L, Francis and D J, Armstrong
- Subjects
Adult ,Fibrin ,Protein Conformation ,Liver Diseases ,Infant, Newborn ,Sialic Acids ,Fibrinogen ,Humans ,Blood Coagulation Disorders ,Infant, Newborn, Diseases - Published
- 1983
43. The role of platelets in the post-embolic responses of slowly adapting intrapulmonary stretch receptors in the rabbit [proceedings]
- Author
-
D J, Armstrong, M, Lacey, and J C, Luck
- Subjects
Blood Platelets ,Pulmonary Stretch Receptors ,Action Potentials ,Animals ,Rabbits ,Pulmonary Embolism ,Mechanoreceptors - Published
- 1979
44. Reflex tracheal contraction evoked in dogs by bronchodilator prostaglandins E2 and I2
- Author
-
Hazel M. Coleridge, Marc P. Kaufman, J. F. Green, D. J. Armstrong, J. C. G. Coleridge, A. M. Roberts, and Harold D. Schultz
- Subjects
Prostaglandins E, Synthetic ,Physiology ,medicine.drug_class ,Prostaglandin ,Action Potentials ,Prostacyclin ,Dinoprostone ,chemistry.chemical_compound ,Dogs ,Nerve Fibers ,Physiology (medical) ,medicine.artery ,Bronchodilator ,Reflex ,medicine ,Animals ,Vagovagal reflex ,business.industry ,Prostaglandins E ,Muscle, Smooth ,Vagus Nerve ,respiratory system ,Epoprostenol ,Stimulation, Chemical ,respiratory tract diseases ,Vagus nerve ,Trachea ,chemistry ,Anesthesia ,Bronchoconstriction ,medicine.symptom ,Bronchial artery ,business ,medicine.drug ,Muscle Contraction - Abstract
Bronchodilator prostaglandins E2 and I2 may cause airway irritation and bronchoconstriction in human subjects. These experiments were designed to test the hypothesis that this paradoxical bronchoconstriction is a vagal reflex triggered by stimulation of airway afferents. We recorded smooth muscle tension in an innervated upper tracheal segment in anesthetized dogs and injected prostaglandins into the general circulation or into a bronchial artery or administered them as aerosol to the lungs. Prostaglandins usually caused tracheal contraction, which survived vagal cooling to 5–7 degrees C but was abolished at 0 degrees C. Vagally mediated tracheal contraction was also evoked when prostacyclin was injected into the pulmonary circulation of dogs whose pulmonary and systemic circulations were independently pump perfused. Recordings of afferent vagal impulses indicated that bronchial arterial injection of prostaglandins stimulated bronchial C-fibers; aerosols of prostaglandin stimulated pulmonary and bronchial C-fibers and C-fibers in extrapulmonary airways. We postulate that in susceptible human subjects concentrations of these prostaglandins too low to have direct bronchodilator effects may cause reflex bronchoconstriction by stimulating afferent vagal C-fibers in the lower airways.
- Published
- 1985
45. The role of glutathione in the toxicity of xenobiotic compounds: metabolic activation of 1,2-dibromoethane by glutathione
- Author
-
I G, Sipes, D A, Wiersma, and D J, Armstrong
- Subjects
Ethylene Dibromide ,Kinetics ,Mice ,Cytosol ,Liver ,Microsomes, Liver ,Animals ,Humans ,Tissue Distribution ,DNA ,Glutathione ,Biotransformation ,Hydrocarbons, Brominated - Abstract
Unstable metabolites may arise during the metabolism of xenobiotic compounds with enzyme systems other than the cytochrome P-450 system. This depends on the enzyme system involved and the structure of the xenobiotic compound being metabolized. Normally detoxifying pathways may transform selected chemicals into toxic metabolites. In our laboratory we have demonstrated that DBE is metabolized by both cytochrome P-450 and GSH S-transferases. Although the cytochrome P-450 metabolite is reactive and will covalently bind to protein and nucleic acid to some extent, and the GSH S-transferase system conjugates it and under conditions of low DBE exposure is able to detoxify it. In contrast, GSH S-transferase catalyzes the direct conjugation of GSH with DBE. This can result in formation of a reactive intermediate that preferentially binds to nucleic acids and is responsible for the DNA damage observed following DBE exposure. The selective toxicity of this xenobiotic compound may be due to the preponderance of activating GSH conjugating enzymes in the extrahepatic organs. However, this difference alone does not appear sufficient to explain the selection of extrahepatic organs as sites of DBE-induced toxicity.
- Published
- 1986
46. Cytokinins. Activity and identification in Staphylococcus epidermidis transfer ribonucleic acid
- Author
-
D J, Armstrong, P K, Evans, W J, Burrows, F, Skoog, J F, Petit, J L, Dahl, T, Steward, J L, Strominger, N J, Leonard, S M, Hecht, and J, Occolowitz
- Subjects
RNA, Transfer ,Genetic Code ,Spectrophotometry ,Ultraviolet Rays ,Spectrum Analysis ,Staphylococcus ,Serine ,Kinins - Published
- 1970
47. Red cell mass and plasma volume changes during transurethral resection of the prostate
- Author
-
V, Colapinto, D J, Armstrong, and D C, Finlayson
- Subjects
Male ,Prostatectomy ,Erythrocytes ,Time Factors ,Blood Volume Determination ,Middle Aged ,Hemolysis ,Postoperative Complications ,Hematocrit ,Chromium Isotopes ,Methods ,Homeostasis ,Humans ,Plasma Volume ,Serum Albumin, Radio-Iodinated ,Therapeutic Irrigation ,Aged ,Hyponatremia - Published
- 1973
48. The effect of spinal anaesthesia on blood volume in man
- Author
-
D. C. Finlayson and D. J. Armstrong
- Subjects
Male ,medicine.medical_specialty ,Blood Volume ,Red Cell ,Blood Volume Determination ,business.industry ,Spinal anesthesia ,Blood volume ,General Medicine ,Middle Aged ,Plasma volume ,Anesthesia, Spinal ,Surgery ,Methamphetamine ,Anesthesiology and Pain Medicine ,Hematocrit ,Anesthesiology ,Anesthesia ,Extracellular fluid ,medicine ,Humans ,Plasma Volume ,business ,Fluid balance ,Aged - Abstract
Blood volume studies were performed on 19 patients immediately before and one hour after the onset of spinal anaesthesia, using the radioactive techniques and the Volemetron apparatus. No change in red cell or plasma volumes and no red cell sequestration occurred with spinal anaesthesia.
- Published
- 1967
49. Effects of variations in source attitude, receiver attitude, and communication stand on reactions to source and content of communications
- Author
-
N T, Feather and D J, Armstrong
- Subjects
Male ,Attitude ,Communication ,Surveys and Questionnaires ,Humans ,Female ,Interpersonal Relations ,Identification, Psychological ,Models, Psychological - Published
- 1967
50. Discovery of Three New Transiting Hot Jupiters: WASP-161 b, WASP-163 b, and WASP-170 b.
- Author
-
K. Barkaoui, A. Burdanov, C. Hellier, M. Gillon, B. Smalley, P. F. L. Maxted, M. Lendl, A. H. M. J. Triaud, D. R. Anderson, J. McCormac, E. Jehin, Y. Almleaky, D. J. Armstrong, Z. Benkhaldoun, F. Bouchy, D. J. A. Brown, A. C. Cameron, A. Daassou, L. Delrez, and E. Ducrot
- Published
- 2019
- Full Text
- View/download PDF
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