K
Konstantin Ignatyev
Researcher at University College London
Publications - 72
Citations - 2737
Konstantin Ignatyev is an academic researcher from University College London. The author has contributed to research in topics: Phase-contrast imaging & X-Ray Phase-Contrast Imaging. The author has an hindex of 25, co-authored 66 publications receiving 2447 citations. Previous affiliations of Konstantin Ignatyev include Stanford University & University of Saskatchewan.
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Journal ArticleDOI
Comet 81P/Wild 2 under a microscope.
Donald E. Brownlee,Peter Tsou,Jérôme Aléon,Conel M. O'd. Alexander,Tohru Araki,Saša Bajt,G. A. Baratta,Ron K. Bastien,Phil Bland,Phil Bland,Pierre Bleuet,Janet Borg,John P. Bradley,Adrian J. Brearley,Frank E. Brenker,Sean Brennan,John Bridges,Nigel D. Browning,Nigel D. Browning,John Robert Brucato,Emma S. Bullock,Mark J. Burchell,Henner Busemann,Anna L. Butterworth,Marc Chaussidon,Allan Cheuvront,Miaofang Chi,Mark J. Cintala,Benton C. Clark,Simon J. Clemett,George D. Cody,Luigi Colangeli,George Cooper,Patrick Cordier,Charles P. Daghlian,Zu Rong Dai,Louis Le Sergeant d'Hendecourt,Zahia Djouadi,Gerardo Dominguez,Tom Duxbury,Jason P. Dworkin,Denton S. Ebel,Thanasis E. Economou,Sirine C. Fakra,Sam A. J. Fairey,Stewart Fallon,G. Ferrini,T. Ferroir,Holger Fleckenstein,Christine Floss,George J. Flynn,Ian A. Franchi,Marc Fries,Zack Gainsforth,J-P Gallien,M. J. Genge,Mary K. Gilles,Philipe Gillet,Jamie Gilmour,Daniel P. Glavin,Matthieu Gounelle,Monica M. Grady,Giles A. Graham,Patrick G. Grant,Simon F. Green,F. Grossemy,Lawrence Grossman,Jeffrey N. Grossman,Yunbin Guan,Kenji Hagiya,Ralph P. Harvey,Philipp R. Heck,Gregory F. Herzog,Peter Hoppe,Friedrich Hörz,Joachim Huth,Ian D. Hutcheon,Konstantin Ignatyev,Hope A. Ishii,Motoo Ito,Damien Jacob,Chris Jacobsen,Stein B. Jacobsen,Steven Jones,David J. Joswiak,A. J. G. Jurewicz,Anton T. Kearsley,Lindsay P. Keller,H Khodja,A. L. David Kilcoyne,Jochen Kissel,Alexander N. Krot,Falko Langenhorst,Antonio Lanzirotti,Loan Le,Laurie A. Leshin,Jan Leitner,Laurence Lemelle,Hugues Leroux,Ming-Chang Liu,K. Luening,Ian C. Lyon,G. J. MacPherson,Matthew A. Marcus,Kuljeet K. Marhas,Bernard Marty,Graciela Matrajt,Kevin D. McKeegan,Anders Meibom,Vito Mennella,Keiko Messenger,Scott Messenger,Takashi Mikouchi,Smail Mostefaoui,Tomoki Nakamura,T Nakano,Matthew Newville,Larry R. Nittler,Ichiro Ohnishi,Kazumasa Ohsumi,Kyoko Okudaira,D. A. Papanastassiou,Russ Palma,Russ Palma,Maria Elisabetta Palumbo,Robert O. Pepin,David Perkins,Murielle C. Perronnet,Piero Pianetta,William Rao,Frans J. M. Rietmeijer,François Robert,Detlef Rost,Alessandra Rotundi,R. E. Ryan,Scott A. Sandford,Craig S. Schwandt,Thomas H. See,D. J. Schlutter,J. Sheffield-Parker,Alexandre Simionovici,Steven B. Simon,I Sitnitsky,Christopher J. Snead,Maegan K. Spencer,Frank J. Stadermann,Andrew Steele,Thomas Stephan,Rhonda M. Stroud,Jean Susini,Stephen R. Sutton,Y Suzuki,Mitra L. Taheri,Susan Taylor,Nick Teslich,Kazu Tomeoka,Naotaka Tomioka,Alice Toppani,Josep M. Trigo-Rodríguez,David Troadec,Akira Tsuchiyama,Anthony J. Tuzzolino,Tolek Tyliszczak,Kentaro Uesugi,Michael A. Velbel,Joe Vellenga,Edward P. Vicenzi,Laszlo Vincze,J. Warren,Iris Weber,M. K. Weisberg,Andrew J. Westphal,Sue Wirick,Diane H. Wooden,Brigitte Wopenka,Penelope J. Wozniakiewicz,Ian Wright,Hikaru Yabuta,Hajime Yano,Edward D. Young,Richard N. Zare,Thomas J. Zega,Karen Ziegler,Laurent Zimmerman,Ernst Zinner,Michael E. Zolensky +185 more
TL;DR: The Stardust spacecraft collected thousands of particles from comet 81P/Wild 2 and returned them to Earth for laboratory study, and preliminary examination shows that the nonvolatile portion of the comet is an unequilibrated assortment of materials that have both presolar and solar system origin.
Journal ArticleDOI
Elemental Compositions of Comet 81P/Wild 2 Samples Collected by Stardust
George J. Flynn,Pierre Bleuet,Janet Borg,John P. Bradley,Frank E. Brenker,Sean Brennan,John Bridges,Donald E. Brownlee,Emma S. Bullock,Manfred Burghammer,Benton C. Clark,Zu Rong Dai,Charles P. Daghlian,Zahia Djouadi,Sirine C. Fakra,T. Ferroir,Christine Floss,Ian A. Franchi,Zack Gainsforth,Jean-Paul Gallien,Philippe Gillet,Patrick G. Grant,Giles A. Graham,Simon F. Green,F. Grossemy,Philipp R. Heck,Gregory F. Herzog,Peter Hoppe,Friedrich Hörz,Joachim Huth,Konstantin Ignatyev,Hope A. Ishii,Koen Janssens,David J. Joswiak,Anton T. Kearsley,Hicham Khodja,Antonio Lanzirotti,Jan Leitner,Laurence Lemelle,Hugues Leroux,K. Luening,Glenn J. MacPherson,Kuljeet K. Marhas,Matthew A. Marcus,Graciela Matrajt,Tomoki Nakamura,Keiko Nakamura-Messenger,Tsukasa Nakano,Matthew Newville,D. A. Papanastassiou,Piero Pianetta,William Rao,Christian Riekel,Frans J. M. Rietmeijer,Detlef Rost,Craig S. Schwandt,Thomas H. See,Julie Sheffield-Parker,Alexandre Simionovici,Ilona Sitnitsky,Christopher J. Snead,Frank J. Stadermann,Thomas Stephan,Rhonda M. Stroud,Jean Susini,Yoshio Suzuki,Stephen R. Sutton,Susan Taylor,Nick Teslich,David Troadec,Peter Tsou,Akira Tsuchiyama,Kentaro Uesugi,Bart Vekemans,Edward P. Vicenzi,Laszlo Vincze,Andrew J. Westphal,Penelope J. Wozniakiewicz,Ernst Zinner,Michael E. Zolensky +79 more
TL;DR: The elements Cu, Zn, and Ga appear enriched in this Wild 2 material, which suggests that the CI meteorites may not represent the solar system composition for these moderately volatile minor elements.
Journal ArticleDOI
Phase and absorption retrieval using incoherent X-ray sources
TL;DR: This work presents a truly incoherent phase retrieval method, which removes the spatial coherence constraints and employs a conventional source without aperturing, collimation, or filtering, and promises to deliver much safer quantitative phase imaging and phase tomography in the future.
Journal ArticleDOI
Low-dose phase contrast tomography with conventional x-ray sources
Alessandro Olivo,S. Gkoumas,Marco Endrizzi,Charlotte K. Hagen,Magdalena B. Szafraniec,Paul C. Diemoz,Peter R. T. Munro,Konstantin Ignatyev,B. Johnson,JA Horrocks,Sarah Vinnicombe,J. L. Jones,Robert D. Speller +12 more
TL;DR: The first tomographic EI XPCi images acquired with a conventional x-ray source at dose levels below that used for preclinical small animal imaging are presented, demonstrating that phase based imaging methods can provide superior results compared to attenuated modalities for weakly attenuating samples also in 3D.
Journal ArticleDOI
Quantitative 3D elemental microtomography of Cyclotella meneghiniana at 400-nm resolution
Martin D. de Jonge,Christian Holzner,Stephen B. Baines,Benjamin S. Twining,Konstantin Ignatyev,Konstantin Ignatyev,Julia M. Diaz,Daryl L. Howard,Daniel Legnini,Antonino Miceli,Ian McNulty,Chris Jacobsen,Chris Jacobsen,Stefan Vogt +13 more
TL;DR: Submicron resolution X-ray fluorescence tomography of a whole unstained biological specimen is demonstrated, quantifying three-dimensional distributions of the elements Si, P, S, Cl, K, Ca, Mn, Fe, Cu, and Zn in the freshwater diatom Cyclotella meneghiniana with 400-nm resolution, improving the spatial resolution by over an order of magnitude.