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El Yaagoubi Y, Loret J, Liore E, Bernard L, Thomas C, Simonneau A, Prunier Aesch C, Chetanneau A, Philippe L, Ogielska M. TEP/TDM au fluorure de sodium (18F-FNa) dans l’imagerie du rachis après arthrodèse. Médecine Nucléaire 2023. [DOI: 10.1016/j.mednuc.2023.01.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Dupuy R, Bertin M, Féraud G, Romanzin C, Putaud T, Philippe L, Michaut X, Jeseck P, Cimino R, Baglin V, Fillion JH. X-Ray induced desorption and photochemistry in CO ice. Phys Chem Chem Phys 2021; 23:15965-15979. [PMID: 34308933 DOI: 10.1039/d1cp02670d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report an investigation of X-ray induced desorption of neutrals, cations and anions from CO ice. The desorption of neutral CO, by far the most abundant, is quantified and discussed within the context of its application to astrochemistry. The desorption of many different cations, including large cations up to the mass limit of the spectrometer, is observed. In contrast, the only desorbing anions detected are O- and C-. The desorption mechanisms of all these species are discussed with the aid of their photodesorption spectrum. The evolution of the X-ray absorption spectrum shows significant chemical modifications of the ice upon irradiation, which along with the desorption of large cations gives a new insight into X-ray induced photochemistry in CO ice.
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Affiliation(s)
- R Dupuy
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005, Paris, France.
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Dupuy R, Bertin M, Féraud G, Michaut X, Marie-Jeanne P, Jeseck P, Philippe L, Baglin V, Cimino R, Romanzin C, Fillion JH. Mechanism of Indirect Photon-Induced Desorption at the Water Ice Surface. Phys Rev Lett 2021; 126:156001. [PMID: 33929258 DOI: 10.1103/physrevlett.126.156001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 03/12/2021] [Indexed: 06/12/2023]
Abstract
Electronic excitations near the surface of water ice lead to the desorption of adsorbed molecules, through a so far debated mechanism. A systematic study of photon-induced indirect desorption, revealed by the spectral dependence of the desorption (7-13 eV), is conducted for Ar, Kr, N_{2}, and CO adsorbed on H_{2}O or D_{2}O amorphous ices. The mass and isotopic dependence and the increase of intrinsic desorption efficiency with photon energy all point to a mechanism of desorption induced by collisions between adsorbates and energetic H/D atoms, produced by photodissociation of water. This constitutes a direct and unambiguous experimental demonstration of the mechanism of indirect desorption of weakly adsorbed species on water ice, and sheds new light on the possibility of this mechanism in other systems. It also has implications for the description of photon-induced desorption in astrochemical models.
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Affiliation(s)
- R Dupuy
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
| | - M Bertin
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
| | - G Féraud
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
| | - X Michaut
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
| | - P Marie-Jeanne
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
| | - P Jeseck
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
| | - L Philippe
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
| | - V Baglin
- CERN, CH-1211 Geneva 23, Switzerland
| | - R Cimino
- Laboratori Nazionali di Frascati (LNF)-INFN, I-00044 Frascati, Italy
| | - C Romanzin
- Laboratoire de Chimie Physique, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405 Orsay, France
| | - J-H Fillion
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
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Zerka F, Vaidyanathan A, Barakat S, Benjamin M, Ralph T.H. L, Sean W, Philippe L. PO-1744: Privacy preserving distributed liver tumor segmentation. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)01762-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Dupuy R, Féraud G, Bertin M, Romanzin C, Philippe L, Putaud T, Michaut X, Cimino R, Baglin V, Fillion JH. Desorption of neutrals, cations, and anions from core-excited amorphous solid water. J Chem Phys 2020; 152:054711. [PMID: 32035460 DOI: 10.1063/1.5133156] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Core-excitation of water ice releases many different molecules and ions in the gas phase. Studying these desorbed species and the underlying desorption mechanisms can provide useful information on the effects of x-ray irradiation in ice. We report a detailed study of the x-ray induced desorption of a number of neutral, cationic, and anionic species from amorphous solid water. We discuss the desorption mechanisms and the relative contributions of Auger and secondary electrons (x-ray induced electron stimulated desorption) and initial excitation (direct desorption) as well as the role of photochemistry. Anions are shown to desorb not just through processes linked with secondary electrons but also through direct dissociation of the core-excited molecule. The desorption spectra of oxygen ions (O+, OH+, H2O+, O-, and OH-) give a new perspective on their previously reported very low desorption yields for most types of irradiations of water, showing that they mostly originate from the dissociation of photoproducts such as H2O2.
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Affiliation(s)
- R Dupuy
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
| | - G Féraud
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
| | - M Bertin
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
| | - C Romanzin
- Laboratoire de Chimie Physique, CNRS, univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay, France
| | - L Philippe
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
| | - T Putaud
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
| | - X Michaut
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
| | - R Cimino
- Laboratori Nazionali di Frascati (LNF)-INFN, I-00044 Frascati, Italy
| | - V Baglin
- CERN, CH-1211 Geneva 23, Switzerland
| | - J-H Fillion
- Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, LERMA, F-75005 Paris, France
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Philippe L, Helias P, Puyraveau M, Boulahdour H, Deconinck E, Daguindau E. Long-term follow-up of (90)Y-ibritumomab-tiuxetan ((90)YIT) in the conditioning of autologous hematopoietic transplantation for indolent and mantle cell lymphomas in a single French center. Bone Marrow Transplant 2016; 51:1140-2. [PMID: 27042844 DOI: 10.1038/bmt.2016.67] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- L Philippe
- Department of Hematology, University Hospital, UMR 1098, Besançon, France
| | - P Helias
- Department of Oncology, University Hospital, Pointe-a-Pitre, Guadeloupe, France
| | - M Puyraveau
- Department of Clinical methodologies, University Hospital, Besançon, France
| | - H Boulahdour
- Department of Nuclear Medicine, University Hospital, Besançon, France
| | - E Deconinck
- Department of Hematology, University Hospital, UMR 1098, Besançon, France
| | - E Daguindau
- Department of Hematology, University Hospital, UMR 1098, Besançon, France
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Doronin M, Bertin M, Michaut X, Philippe L, Fillion JH. Adsorption energies and prefactor determination for CH3OH adsorption on graphite. J Chem Phys 2015; 143:084703. [DOI: 10.1063/1.4929376] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- M. Doronin
- LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, F-75252 Paris, France
| | - M. Bertin
- LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, F-75252 Paris, France
| | - X. Michaut
- LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, F-75252 Paris, France
| | - L. Philippe
- LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, F-75252 Paris, France
| | - J.-H. Fillion
- LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, F-75252 Paris, France
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Philippe L, Voicu M, Katringer E, Moldovan M, Deconinck E, Duchene F. Pseudo-microangiopathie : diagnostic à ne pas manquer ! Rev Med Interne 2014. [DOI: 10.1016/j.revmed.2014.10.329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Vichery C, Le Nader V, Frantz C, Zhang Y, Michler J, Philippe L. Stabilization mechanism of electrodeposited silicon thin films. Phys Chem Chem Phys 2014; 16:22222-8. [PMID: 25212513 DOI: 10.1039/c4cp02797c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- C Vichery
- EMPA, Swiss Fed Labs Mat Sci & Technol, Laboratory for Mechanics of Materials & Nanostructures, CH-3602 Thun, Switzerland.
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Fillion JH, Fayolle EC, Michaut X, Doronin M, Philippe L, Rakovsky J, Romanzin C, Champion N, Öberg KI, Linnartz H, Bertin M. Wavelength resolved UV photodesorption and photochemistry of CO2ice. Faraday Discuss 2014; 168:533-52. [DOI: 10.1039/c3fd00129f] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Elias J, Utke I, Yoon S, Bechelany M, Weidenkaff A, Michler J, Philippe L. Electrochemical growth of ZnO nanowires on atomic layer deposition coated polystyrene sphere templates. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.04.168] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Crabol Y, Terrier B, Rozenberg F, Pestre V, Legendre C, Hermine O, Montagnier-Petrissans C, Guillevin L, Mouthon L, Loic G, Annette B, Alain F, Bertrand F, Bertrand G, Amelie L, Isabelle L, Catherine MP, Luc M, Eric O, Nathalie P, Helene S, Tarek S, Hopital Ambroise P, Jean-Marie LP, Bruno F, Bernard C, Thomas P, Francois D, Loic G, Zora M, Olivier H, Christophe L, Philippe L, Olivier L, Jean-Charles P, Norbert-Claude G, Jean-Paul F, Eric O, Guy L, Hopital B, Hopital N, Amina B. Intravenous Immunoglobulin Therapy for Pure Red Cell Aplasia Related to Human Parvovirus B19 Infection: A Retrospective Study of 10 Patients and Review of the Literature. Clin Infect Dis 2012; 56:968-77. [DOI: 10.1093/cid/cis1046] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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Yi Chun DX, Alexandre H, Edith B, Nacera O, Julie P, Chantal J, Eric R, Zhang X, Jin Y, Miravete M, Dissard R, Klein J, Gonzalez J, Caubet C, Pecher C, Pipy B, Bascands JL, Mercier-Bonin M, Schanstra J, Buffin-Meyer B, Claire R, Rigothier C, Richard D, Sebastien L, Moin S, Chantal B, Christian C, Jean R, Migliori M, Migliori M, Cantaluppi V, Mannari C, Medica D, Giovannini L, Panichi V, Goldwich A, Alexander S, Andre G, Amann K, Migliorini A, Sagrinati C, Angelotti ML, Mulay SR, Ronconi E, Peired A, Romagnani P, Anders HJ, Chiang WC, Lai CF, Peng WH, Wu CF, Chang FC, Chen YT, Lin SL, Chen YM, Wu KD, Lu KS, Tsai TJ, Virgine O, Qing Feng F, Zhang SY, Dominique D, Vincent A, Marina C, Philippe L, Georges G, Pawlak A, Sahali D, Matsumoto S, Kiyomoto H, Ichimura A, Dan T, Nakamichi T, Tsujita T, Akahori K, Ito S, Miyata T, Xie S, Zhang B, Shi W, Yang Y, Nagasu H, Satoh M, Kidokoro K, Nishi Y, Ihoriya C, Kadoya H, Sasaki T, Kashihara N, Wu CF, Chang FC, Chen YT, Chou YH, Duffield J, Lin SL, Rocca C, Rocca C, Gregorini M, Corradetti V, Valsania T, Bedino G, Bosio F, Pattonieri EF, Esposito P, Sepe V, Libetta C, Rampino T, Dal Canton A, Bedino G, Gregorini M, Corradetti V, Rocca C, Pattonieri EF, Valsania T, Bosio F, Esposito P, Sepe V, Libetta C, Rampino T, Dal Canton A, Omori H, Kawada N, Inoue K, Ueda Y, Yamamoto R, Matsui I, Kaimori J, Takabatake Y, Moriyama T, Isaka Y, Rakugi H, Wasilewska A, Taranta-Janusz K, Deebek W, Kuroczycka-Saniutycz E, Lee AS, Lee AS, Lee JE, Jung YJ, Kang KP, Lee S, Kim W, Arfian N, Emoto N, Yagi K, Nakayama K, Hartopo AB, Nugrahaningsih DA, Yanagisawa M, Hirata KI, Munoz-Felix JM, Lopez-Novoa JM, Martinez-Salgado C, Oujo B, Munoz-Felix JM, Arevalo M, Bernabeu C, Perez-Barriocanal F, Lopez-Novoa JM, Jesper K, Nathalie V, Pierre G, Yi Chun DX, Alexandre H, Eric R, Iyoda M, Shibata T, Matsumoto K, Shindo-Hirai Y, Kuno Y, Wada Y, Akizawa T, Schwartz I, Schwartz D, Prot Bertoye C, Prot Bertoye C, Terryn S, Claver J, Beghdadi WB, Monteiro R, Blank U, Devuyst O, Daugas E, Van Beneden K, Geers C, Pauwels M, Mannaerts I, Van den Branden C, Van Grunsven LA, Seckin I, Pekpak M, Uzunalan M, Uruluer B, Kokturk S, Ozturk Z, Sonmez H, Yaprak E, Furuno Y, Tsutsui M, Morishita T, Shimokawa H, Otsuji Y, Yanagihara N, Kabashima N, Ryota S, Kanegae K, Miyamoto T, Nakamata J, Ishimatsu N, Tamura M, Nakagawa T, Nakagawa T, Ichikawa K, Miyamoto M, Takabayashi D, Yamazaki H, Kakeshita K, Koike T, Kagitani S, Tomoda F, Hamashima T, Ishii Y, Inoue H, Sasahara M, El Machhour F, Kerroch M, Mesnard L, Chatziantoniou C, Dussaule JC, Inui K, Sasai F, Maruta Y, Nishiwaki H, Kawashima E, Inoue Y, Yoshimura A, Matsumoto K, Matsumoto K, Iyoda M, Shibata T, Wada Y, Shindo-Hirai Y, Kuno Y, Akizawa T, Musacchio E, Priante G, Valvason C, Sartori L, Baggio B, Kim JH, Gross O, Diana R, Gry DH, Asimal B, Johanna T, Imke SE, Lydia W, Gerhard-Anton M, Hassan D, Cano JL, Griera M, Olmos G, Martin P, Cortes MA, Lopez-Ongil S, Rodriguez-Puyol D, DE Frutos S, Gonzalez M, DE Frutos S, Cano JL, Luengo A, Martin P, Rodriguez-Puyol M, Calleros L, Lupica R, Lacquaniti A, Donato V, Maggio R, Mastroeni C, Lucisano S, Cernaro V, Fazio MR, Quartarone A, Buemi M, Kacik M, Goedicke S, Eggert H, Hoyer JD, Wurm S, Wurm S, Steege A, Banas M, Kurtz A, Banas B, Lasagni L, Lazzeri E, Peired A, Angelotti ML, Ronconi E, Romoli S, Romagnani P, Schaefer I, Teng B, Worthmann K, Haller H, Schiffer M, Prattichizzo C, Netti GS, Rocchetti MT, Cormio L, Carrieri G, Stallone G, Grandaliano G, Ranieri E, Gesualdo L, Kucher A, Smirnov A, Parastayeva M, Beresneva O, Kayukov I, Zubina I, Ivanova G, Abed A, Schlekenbach L, Foglia B, Chatziantoniou C, Kwak B, Chadjichristos C, Queisser N, Schupp N, Brand S, Himer L, Himer L, Szebeni B, Sziksz E, Saijo S, Kis E, Prokai A, Banki NF, Fekete A, Tulassay T, Vannay A, Hegner B, Schaub T, Lange C, Dragun D, Klinkhammer BM, Rafael K, Monika M, Anna M, Van Roeyen C, Boor P, Eva Bettina B, Simon O, Esther S, Floege J, Kunter U, Hegner B, Janke D, Schaub T, Lange C, Jankowski J, Dragun D, Hayashi M, Takamatsu I, Horimai C, Yoshida T, Seno DI Marco G, Koenig M, Stock C, Reiermann S, Amler S, Koehler G, Fobker M, Buck F, Pavenstaedt H, Lang D, Brand M, Plotnikov E, Morosanova M, Pevzner I, Zorova L, Pulkova N, Zorov D, Wornle M, Ribeiro A, Belling F, Merkle M, Nakazawa D, Nishio S, Shibasaki S, Tomaru U, Akihiro I, Kobayashi I, Imanishi Y, Kurajoh M, Nagata Y, Yamagata M, Emoto M, Michigami T, Ishimura E, Inaba M, Nishi Y, Satoh M, Sasaki T, Kashihara N, Wu CC, Lu KC, Chen JS, Chu P, Lin YF, Eller K, Schroll A, Banas M, Kirsch A, Huber J, Weiss G, Theurl I, Rosenkranz AR, Zawada A, Rogacev K, Achenbach M, Fliser D, Held G, Heine GH, Miyamoto Y, Iwao Y, Watanabe H, Kadowaki D, Ishima Y, Chuang VTG, Sato K, Otagiri M, Maruyama T, Ueda Y, Iwatani H, Isaka Y, Watanabe H, Honda D, Miyamoto Y, Noguchi T, Kadowaki D, Ishima Y, Tanaka M, Tanaka H, Fukagawa M, Otagiri M, Maruyama T, Wornle M, Ribeiro A, Pircher J, Koppel S, Mannell H, Krotz F, Merkle M, Virzi GM, Bolin C, Cruz D, Scalzotto E, De Cal M, Vescovo G, Ronco C, Virzi GM, Bolin C, Cruz D, Scalzotto E, De Cal M, Vescovo G, Ronco C, Grobmayr R, Lech M, Ryu M, Anders HJ, Aoshima Y, Mizobuchi M, Ogata H, Kumata C, Nakazawa A, Kondo F, Ono N, Koiwa F, Kinugasa E, Akizawa T, Freisinger W, Lale N, Lampert A, Ditting T, Heinlein S, Schmieder RE, Veelken R, Nave H, Perthel R, Suntharalingam M, Bode-Boger S, Beutel G, Kielstein J, Rodrigues-Diez R, Rodrigues-Diez R, Rayego-Mateos S, Lavoz C, Stark Aroeira LG, Orejudo M, Alique M, Ortiz A, Egido J, Ruiz-Ortega M, Oskar W, Rusan C, Schaub T, Hegner B, Dragun D, Padberg JS, Wiesinger A, Brand M, Seno DI Marco G, Reuter S, Grabner A, Kentrup D, Lukasz A, Oberleithner H, Pavenstadt H, Kumpers P, Eberhardt HU, Skerka C, Chen Q, Hallstroem T, Hartmann A, Kemper MJ, Zipfel PF, N'gome-Sendeyo K, Fan QF, Zhang SY, Pawlak A, Sahali D, Wornle M, Ribeiro A, Merkle M, Toblli J, Toblli J, Cao G, Giani JF, Dominici FP, Kim JS, Yang JW, Kim MK, Han BG, Choi SO. Experimental pathology. Nephrol Dial Transplant 2012. [DOI: 10.1093/ndt/gfs241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Guérin VM, Elias J, Nguyen T, Philippe L, Pauporté T. Ordered networks of ZnO-nanowire hierarchical urchin-like structures for improved dye-sensitized solar cells. Phys Chem Chem Phys 2012; 14:12948-55. [DOI: 10.1039/c2cp42085f] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Mook WM, Niederberger C, Bechelany M, Philippe L, Michler J. Compression of freestanding gold nanostructures: from stochastic yield to predictable flow. Nanotechnology 2010; 21:055701. [PMID: 20023305 DOI: 10.1088/0957-4484/21/5/055701] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Characterizing the mechanical response of isolated nanostructures is vitally important to fields such as microelectromechanical systems (MEMS) where the behaviour of nanoscale contacts can in large part determine system reliability and lifetime. To address this challenge directly, single crystal gold nanodots are compressed inside a high resolution scanning electron microscope (SEM) using a nanoindenter equipped with a flat punch tip. These structures load elastically, and then yield in a stochastic manner, at loads ranging from 16 to 110 microN, which is up to five times higher than the load necessary for flow after yield. Yielding is immediately followed by displacement bursts equivalent to 1-50% of the initial height, depending on the yield point. During the largest displacement bursts, strain energy within the structure is released while new surface area is created in the form of localized slip bands, which are evident in both the SEM movies and still-images. A first order estimate of the apparent energy release rate, in terms of fracture mechanics concepts, for bursts representing 5-50% of the structure's initial height is on the order of 10-100 J m(-2), which is approximately two orders of magnitude lower than bulk values. Once this initial strain burst during yielding has occurred, the structures flow in a ductile way. The implications of this behaviour, which is analogous to a brittle to ductile transition, are discussed with respect to mechanical reliability at the micro- and nanoscales.
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Affiliation(s)
- W M Mook
- Laboratory for Mechanics of Materials and Nanostructures, Empa, Swiss Federal Laboratories for Materials Testing and Research, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland.
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Bechelany M, Brodard P, Philippe L, Michler J. Extended domains of organized nanorings of silver grains as surface-enhanced Raman scattering sensors for molecular detection. Nanotechnology 2009; 20:455302. [PMID: 19834249 DOI: 10.1088/0957-4484/20/45/455302] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The possibility to synthesize large areas of silver grains organized in nanorings using a simple technique based on nanosphere lithography and electroless plating as a metal deposition method is described for the first time. In addition, we present a systematic SERS study of the obtained long-range ordered silver nanodots and nanorings. The possibility to precisely control the size, the interdistance and the morphology of these nanostructures allows us to systematically investigate the influence of these parameters on SERS. We show that the best possible SERS substrates should not only present optimal sizes, interdistances and shapes, but also a grain-like structure composed of sub-100 nm grains in order to maximize the number of hot-spots. In addition, we show that grains arranged in nanorings present higher enhancement factors (E(F) = 5.5 x 10(5)) as compared to similar arrays made of nanodots. A wide range of applications, including real-time monitoring of catalytic surface reactions, environmental and security monitoring as well as clinical and pharmaceutical screening, can be envisaged for these SERS substrates.
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Affiliation(s)
- M Bechelany
- Laboratory for Mechanics of Materials and Nanostructures, EMPA, Swiss Federal Laboratories for Materials Testing and Research, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland.
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Sakamoto S, Philippe L, Bechelany M, Michler J, Asoh H, Ono S. Ordered hexagonal array of Au nanodots on Si substrate based on colloidal crystal templating. Nanotechnology 2008; 19:405304. [PMID: 21832614 DOI: 10.1088/0957-4484/19/40/405304] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report two types of site-selective metal deposition methods based on colloidal crystal templating. We discuss in particular the controllability of the morphology and crystallinity of Au nanodots depending of the choice of method.
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Affiliation(s)
- S Sakamoto
- Department of Applied Chemistry, Faculty of Engineering, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, Japan
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Affiliation(s)
- L Philippe
- EMPA (Swiss Federal Laboratories for Materials Testing and Research) Feuerwerkerstrasse 39, 3602 Thun, Switzerland.
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Bisson R, Philippe L, Châtelet M, Kratzer P. Comment on “Angular distributions of H-induced HD and D2 desorptions from the Si(100) surfaces” [J. Chem. Phys. 124, 054715 (2006)]. J Chem Phys 2008; 128:017101; author reply 017102. [DOI: 10.1063/1.2779032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Yang S, Philippe L, Châtelet M. Formation and Characterization of Large (Ar) n , (N2) n , and Mixed (Ar) n (N2) m van der Waals Clusters Produced by Supersonic Expansion. J CLUST SCI 2007. [DOI: 10.1007/s10876-007-0136-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bisson R, Yang S, Philippe L, Châtelet M. Non-activated pathway in angle-resolved study of H2 molecules produced in the abstraction reaction of incident H atoms on hydrogenated Si(100). Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.06.072] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Gouze-Decaris E, Philippe L, Minn A, Haouzi P, Gillet P, Netter P, Terlain B. Neurophysiological basis for neurogenic-mediated articular cartilage anabolism alteration. Am J Physiol Regul Integr Comp Physiol 2001; 280:R115-22. [PMID: 11124141 DOI: 10.1152/ajpregu.2001.280.1.r115] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study was designed to investigate the pathways involved in neurogenic-mediated articular cartilage damage triggered by a nonsystemic distant subcutaneous or intra-articular inflammation. The cartilage damage was assessed 24 h after subcutaneous or intra-articular complete Freund's adjuvant (CFA) injection measuring patellar proteoglycan (PG) synthesis (ex vivo [Na(2)(35)SO(4)] incorporation) in 96 Wistar rats. Unilateral subcutaneous or intra-articular injection of CFA induced significant decrease (25-29%) in PG synthesis in both patellae. Chronic administration of capsaicin (50 mg. kg(-1). day(-1) during 4 days), which blunted the normal response of C fiber stimulation, prevented the bilateral significant decrease in cartilage synthesis. Similarly, intrathecal injection of MK-801 (10 nmol/day during 5 days), which blocked the glutamatergic synaptic transmission at the dorsal horn of signal originating in primary afferent C fibers, eliminated the CFA-induced PG synthesis decrease in both patellae. Chemical sympathectomy, induced by guanethidine (12.5 mg. kg(-1). day(-1) during 6 wk), also prevented PG synthesis alteration. Finally, compression of the spinal cord at the T3-T5 level had a similar protective effect on the reduction of [Na(2)(35)SO(4)] incorporation. It is concluded that the signal that triggers articular cartilage synthesis damage induced by a distant local inflammation 1) is transmitted through the afferent C fibers, 2) makes glutamatergic synaptic connections with the preganglionic neurons of the sympathetic system, and 3) involves spinal and supraspinal pathways.
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Affiliation(s)
- E Gouze-Decaris
- Laboratoire de Physiopathologie et Pharmacologie Articulaires, Unite Mixte Recherche 7561 Centre National de la Recherche Scientifique-Université Henri Poincaré-Nancy I, France
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Philippe L, Lemonnier E, Jouquan J, Lazartigues A. P02.349 What are the skills required for general practice and paediatrics as FAS as the psychopathology of children and adolescents is concerned? Eur Psychiatry 2000. [DOI: 10.1016/s0924-9338(00)94756-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Casset-Senon D, Babuty D, Philippe L, Fauchier L, Eder V, Fauchier JP, Pottier JM, Delhomme C, Cosnay P. Fourier phase analysis of SPECT equilibrium radionuclide angiography in symptomatic patients with mitral valve prolapse without significant mitral regurgitation: assessment of biventricular functional abnormalities suggesting a cardiomyopathy. J Nucl Cardiol 2000; 7:471-7. [PMID: 11083196 DOI: 10.1067/mnc.2000.107242] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Ventricular premature beats are common in patients with mitral valve prolapse (MVP). The purpose of this study was to determine whether symptomatic patients with MVP had certain functional characteristics and if ventricular arrhythmia (VA) could be explained by functional extravalvular abnormalities. Single photon emission computed tomography equilibrium radionuclide angiography with Fourier phase analysis was preferred to the planar radionuclide method. Only patients without significant mitral regurgitation were studied. METHODS AND RESULTS A total of 23 symptomatic patients with MVP (13 men, 10 women, mean age, 47+/-14 years) without mitral regurgitation underwent single photon emission computed tomography equilibrium radionuclide angiography. Symptoms were present in 20 patients, and VA was present in 14 patients. Ejection fraction, regional wall motion, and Fourier phase analysis were examined in both ventricles and compared with results for normal subjects. Ventricular abnormalities were observed in 20 (87%) patients: decreased left ventricular and right ventricular ejection fractions, increased standard deviations of the mean phase and focal wall motion, and/or delayed phase abnormalities. Abnormalities were less frequent but more marked in the right ventricular free wall, the infundibulum, or the septum compared with left ventricular delayed abnormalities, which were more frequent but limited. In 12 of 14 patients with VA, phase-delayed areas were observed in the ventricle where the origin of ventricular premature beats was suspected on the basis of their electrocardiographic morphologic features. A relation was found between late potentials and delayed-phase areas (right ventricle or septum) and left bundle branch block morphologic features of VA. CONCLUSIONS Symptomatic patients with MVP frequently have ventricular dysfunction in 1 or both ventricles, sometimes limited but more marked in the presence of severe VA even without significant mitral regurgitation, suggesting structural modification. The use of a sensitive, accurate, and 3-dimensional method such as single photon emission computed tomography equilibrium radionuclide angiography may be of interest for a noninvasive investigation, especially in young symptomatic patients with MVP and VA.
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Affiliation(s)
- D Casset-Senon
- Nuclear Medicine Department, Trousseau Hospital, Tours, France.
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Casset-Senon D, Babuty D, Alison D, Philippe L, Eder V, Fauchier L, Cosnay P. Delayed contraction area responsible for sustained ventricular tachycardia in an arrhythmogenic right ventricular cardiomyopathy: demonstration by Fourier analysis of SPECT equilibrium radionuclide angiography. J Nucl Cardiol 2000; 7:539-42. [PMID: 11083203 DOI: 10.1067/mnc.2000.108730] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- D Casset-Senon
- Nuclear Medicine Department, Centre Hospitalier Universitaire, Trousseau, Tours, France.
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Philippe L, Rene C, Guillot J, Berthalemy M, Polack B, Laine V, Lacube P, Chermette R, Roux P. Impaction versus filtration for the detection of Pneumocystis carinii DNA in air. J Eukaryot Microbiol 1999; 46:94S. [PMID: 10519264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Affiliation(s)
- L Philippe
- UMR INRA-AFSSA-ENVA Immunologie et Biologie Moléculaire Parasitaires et Fongiques, Ecole Nationale Vétérinaire d' Alfort, Maisons Alfort, France.
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Decaris E, Guingamp C, Chat M, Philippe L, Grillasca JP, Abid A, Minn A, Gillet P, Netter P, Terlain B. Evidence for neurogenic transmission inducing degenerative cartilage damage distant from local inflammation. Arthritis Rheum 1999; 42:1951-60. [PMID: 10513812 DOI: 10.1002/1529-0131(199909)42:9<1951::aid-anr22>3.0.co;2-d] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVE To investigate involvement of the nervous system in ipsilateral and contralateral joint inflammation. METHODS Freund's complete adjuvant (CFA; 1 mg or 1 microg) was injected unilaterally and the messages (a) from the hind paw to the ipsilateral and contralateral knees and (b) from one knee to the contralateral knee were analyzed. The degenerative impact of the local injury on distant cartilage was assessed using patellar proteoglycan synthesis as an indicator. Neurogenic mechanisms were blocked either by spinal cord compression or by injection of neurokinin 1 (NK-1) antagonist, or they were mimicked by intraarticular injection of substance P. The data were compared with those gathered in a model of systemic inflammation, characterized by fever and serum interleukin-6 production. RESULTS After unilateral subcutaneous injection of CFA, proteoglycan anabolism decreased bilaterally. Spinal cord compression and administration of the NK-1 antagonist inhibited the response in the contralateral limb. Following 1 mg CFA subcutaneous injection, the ipsilateral response implicated both neurogenic and systemic mechanisms, whereas the nervous system alone was implicated after 1 microg subcutaneous CFA injection. The 1 microg CFA intraarticular injection induced a degenerative contralateral signal, which was abolished by spinal cord compression and by pretreatment with the NK-1 antagonist. Intraarticular injection of 1 microg CFA also induced an ipsilateral increase of anabolism, which was enhanced by spinal cord compression. Similar results were obtained after intraarticular injections of substance P. These effects were not reproduced with turpentine treatment, a systemic model, in which spinal cord compression had no effect. CONCLUSION A unilateral inflammation can induce, by neurogenic mechanisms, distal bilateral degeneration of articular cartilage, implicating involvement of neuropeptides.
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Affiliation(s)
- E Decaris
- Université Henri Poincaré-Nancy I, Vandoeuvre-lès-Nancy, France
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Gegout-Pottie P, Philippe L, Simonin MA, Guingamp C, Gillet P, Netter P, Terlain B. Biotelemetry: an original approach to experimental models of inflammation. Inflamm Res 1999; 48:417-24. [PMID: 10493158 DOI: 10.1007/s000110050481] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
Biotelemetry is a new biological technology which evaluates continuous spontaneous locomotor activity and body temperature in rodents. The telemetry system comprises a transmitter implanted in the peritoneal cavity of the rodent, and a receiver placed beneath the animal's cage. The receiver detects the radio waves and the activity of the rodents as counts which are registered in the computer system, and the adapter detects the calibrated body temperature. First, we showed that biotelemetric studies of different species (rats, guinea pigs, mice and gerbils) provide substantial information about their circadian rhythms. Second, using the most common examples employed in pharmacology of inflammation (hyperthermia, arthritis, ischemia-reperfusion and so on) biotelemetry has helped us to clarify the pathophysiological significance of the parameters of temperature and mobility in several experimental models in rodents.
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Affiliation(s)
- P Gegout-Pottie
- UMR 7561, CNRS-Université Nancy I, Faculté de Medecine, Vandoeuvre Les Nancy, France
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Casset-Senon D, Philippe L, Babuty D, Eder V, Fauchier L, Fauchier JP, Pottier JM, Cosnay P. Diagnosis of arrhythmogenic right ventricular cardiomyopathy by fourier analysis of gated blood pool single-photon emission tomography. Am J Cardiol 1998; 82:1399-404. [PMID: 9856927 DOI: 10.1016/s0002-9149(98)00649-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
To evaluate the diagnostic performance of Fourier phase analysis of gated blood pool single-photon emission computed tomography (GBP SPECT) in arrhythmogenic right ventricular (RV) cardiomyopathy, 18 patients with confirmed arrhythmogenic RV cardiomyopathy underwent GBP SPECT and x-ray cineangiography. Results were compared with data obtained with GBP SPECT in 10 control subjects. This 3-dimensional method demonstrated good correlation with cineangiography for measurements of RV enlargement and extent of the disease; RV and left ventricular segments were analyzed with the same accuracy. Tomographic abnormalities were significant decreased RV ejection fraction, RV dilatation, nonsynchronized contraction of the ventricles, increased RV contraction dispersion, presence of segmental RV wall motion disorders and/or phase delays, and occasionally regional left ventricular abnormalities. RV-delayed phase areas were always present in our population. A scoring system with RV criteria was proposed to diagnose RV disease. Because Fourier analysis of GBP SPECT provides ventricular morphologic information for the right ventricle with the same accuracy as for the left ventricle, it may replace planar radionuclide studies. Therefore, this method is helpful in patients with a strong clinical suspicion of arrhythmogenic RV cardiomyopathy, and should be used as a screening method before right ventriculography.
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Affiliation(s)
- D Casset-Senon
- Nuclear Medicine Department, UMR CNR 6542, Trousseau Hospital, Tours, France
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Vanzetto G, Marie P, Leguludec D, Brunotte F, Philippe L, Itti R, Baral J, Pasqualini R, Chossat F, Machecourt J, Fagret D. Tc99m-Noet: a new myocardial perfusion imaging agent that demonstrates redistribution. Comparison with Thallium-201 in patients with coronary artery disease. J Am Coll Cardiol 1998. [DOI: 10.1016/s0735-1097(98)81403-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Philippe L, Gegout-Pottie P, Guingamp C, Bordji K, Terlain B, Netter P, Gillet P. Relations between functional, inflammatory, and degenerative parameters during adjuvant arthritis in rats. Am J Physiol 1997; 273:R1550-6. [PMID: 9362323 DOI: 10.1152/ajpregu.1997.273.4.r1550] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We assessed the time-course of adjuvant arthritis (AA) in Lewis rats, using biotelemetry to monitor the rat's spontaneous locomotor activity and body temperature, and studied the evolution of the arthritic index, circulating concentrations of inflammation-promoting cytokines, cartilage proteoglycan synthesis, and the effect of indomethacin as a cyclooxygenase inhibitor to evaluate prostaglandin (PG) contribution in AA. The injection of complete Freund's adjuvant on day 0 (D0) induced a marked, transient loss of locomotor activity (D1-D4; initial phase) and then a second phase of hypomobility peaking on D15 and thereafter irreversible (D16-D20; arthritic phase). Fever peaked first on D1 and again between D13 and D17. The primary hyperthermia was associated with increases in plasma interleukin-6 and tumor necrosis factor-alpha concentrations and seemed to be partly PG dependent. Proteoglycan synthesis inhibition in the patellar cartilage increased gradually, spreading from the injected paw to the contralateral paw. It was corrected on D20 by preventive and curative indomethacin treatments. Indomethacin also greatly relieved hypomobility during the systemic phase of AA (D10-D15). The combination of information about cartilage metabolism, body temperature, locomotor activity, and cytokine in this study permits analysis of analgesic, antipyretic, anti-inflammatory, and chondroprotective properties of drugs in the various phases of AA. Thus, using a new methodology, we have discriminated the different phases of the disease and confirmed the symptomatic and systemic inhibitory effect of indomethacin on fever, activity, and cartilage metabolism.
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Affiliation(s)
- L Philippe
- Unité de Recherches Associée Centre National de la Recherche Scientifique 1288, Physiopathologie et Pharmacologie Articulaires, Faculté de Médecine, Université Henri Poincaré Nancy I, Vandoeuvre-lès-Nancy, France
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Guingamp C, Gegout-Pottie P, Philippe L, Terlain B, Netter P, Gillet P. Mono-iodoacetate-induced experimental osteoarthritis: a dose-response study of loss of mobility, morphology, and biochemistry. Arthritis Rheum 1997; 40:1670-9. [PMID: 9324022 DOI: 10.1002/art.1780400917] [Citation(s) in RCA: 300] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE To characterize the dose-responsiveness of morphologic and biochemical chondral changes relative to mobility in mono-iodoacetate (MIA)-induced osteoarthritis (OA) in rats. METHODS Rat mobility was assessed by biotelemetry. Articular lesions were characterized by macroscopic and histologic examinations. Cartilage proteoglycan metabolism was evaluated by the 1,9-dimethylmethylene blue dye binding assay and by radiosulfate incorporation in patellar cartilage. RESULTS Spontaneous locomotor activity was rapidly, transiently, and dose-dependently decreased after MIA injection into rat knees (primary response). Thereafter, only high doses (0.3 mg and 3.0 mg) led to a secondary progressive long-term loss of spontaneous mobility on day 15, when subchondral bone was exposed. These 2 doses resulted in significant changes in cartilage proteoglycan concentration at day 15 and a strong inhibition of anabolism in the peripheral patellae by day 2, contrasting with the effects of lower doses (0.01, 0.03, and 0.1 mg). CONCLUSION When a sufficient dose of MIA is used, this model can easily and quickly reproduce OA-like lesions and functional impairment in rats, similar to that observed in human disease. These parameters, as well as proteoglycan metabolism, could serve as indicators for studying chondroprotective drugs, or for evaluating the ability of imaging techniques to detect and evaluate chondral lesions.
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Affiliation(s)
- C Guingamp
- Faculté de Médecine, Vandoeuvre-les-Nancy, France
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Casset-Senon D, Cosnay P, Philippe L, Fauchier L, Charniot JC, Eder V, Babuty D, Chidebi D, Pottier JM, Fauchier JP. [Value of tomoscintigraphy with Fourier analysis in the diagnosis of arrhythmogenic right ventricular cardiomyopathy]. Arch Mal Coeur Vaiss 1997; 90:935-944. [PMID: 9339254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
ECG gated blood pool tomography has been performed in sixteen patients with right ventricular arrhythmias in whom the diagnosis of arrhythmogenic right ventricular cardiomyopathy was made based on the finding of abnormalities on contrast angiography. They were compared both to control subjects and to patients with primary dilated cardiomyopathy. Thick slices of ventricles were obtained throughout the cardiac cycle in three orthogonal planes: horizontal long axis and short axis thick slices for analysis of right and left ventricular regional wall motion abnormalities and analysis of the spread of the contraction by means of Fourier phase imaging, vertical long axis slices (one for each ventricle) for ejection fractions, because of easy and reproducible determination of valvular planes and analysis of all right ventricular segments, especially the pulmonary infundibulum. Five typical right ventricular abnormalities were seen: decreased ejection fraction (32 +/- 15% vs 55 +/- 3% in control; p < 0.001), increased diameter (ratio of right to left diameters = 1.2 +/- 0.3 vs 0.9 +/- 0.1; p < 0.01), global delayed contraction versus that of the left ventricle (22 +/- 20 degrees vs -2 +/- 6%; p < 0.01), increased dispersion of contraction (32 +/- 16 degrees vs 13 +/- 4 degrees; p < 0.01) and presence of segments with decreased and/or delayed contraction. Right ventricular disease was observed in all the patients: localized form (56%), diffused form (44%). This method provides accurate functional data for diagnosis and follow-up of patients. In future, this wall motion evaluation method may replace planar nuclear angiography as myocardial SPECT have replaced myocardial planar scintigraphy.
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Affiliation(s)
- D Casset-Senon
- Service de médecine nucléaire, Centre hospitalier universitaire Trousseau, Tours
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Abstract
Thyroid carcinoma metastatic to the paranasal sinuses is extremely rare, with only 11 cases reported in the English and European literature. We report a case of metastatic follicular thyroid carcinoma to the clivus with extension into the sphenoid and posterior ethmoid sinuses. Pathological diagnosis was obtained using an intranasal endoscopic biopsy. As with our patient, metastatic thyroid carcinoma may present with symptoms related to distant metastases rather than the primary lesion. Distant metastases in differentiated thyroid carcinoma portends a poor prognosis. Our case of metastatic thyroid carcinoma to the paranasal sinuses is summarized in the context of the 11 additional cases, and treatment options are discussed.
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Affiliation(s)
- K W Altman
- Department of Otorhinolaryngology, Head & Neck Surgery, Hospital of the University of Pennsylvania, Philadelphia, USA
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Philippe L, Hirayama T, Ramage MJ, Comtet G, Rose M, Hellner L, Dujardin G. Molecular reactions in condensed carbon monoxide studied by ion photodesorption. J Chem Phys 1997. [DOI: 10.1063/1.473729] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Abdoul-Carime H, Bouteiller Y, Desfrancois C, Philippe L, Schermann JP, Niinistö L, Styring S, Tommos C, Warncke K, Wood BR. Excess Electrons in Polar Cluster Anions. ACTA ACUST UNITED AC 1997. [DOI: 10.3891/acta.chem.scand.51-0145] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Abstract
OBJECTIVE To develop an animal model for fetal endoscopic surgery which could be feasible and reproducible. The aim of this work was to perform a fetoscopy without the need of a laparotomy. METHODS Pregnant ewes underwent under general anesthesia laparoscopy with the creation of a maternal pneumoperitoneum. After localizing the placenta by transillumination, we carried out fetoscopy through a 5 mm trocar using a perfusion of Ringer's solution. RESULTS Five video-assisted procedures have been performed. None of the cases has shown any bleeding from myometrial wounds and no suture was necessary. There was no leakage of amniotic fluid. Intrauterine space was large enough to manipulate instruments without producing any fetal damage. Sharp visualization and anatomical description of the fetus were precise without the use CO2. There were no miscarriages and postnatal examinations of the lambs were normal. CONCLUSION Fetoscopic surgery can be performed in the pregnant sheep without any complications but preterm labor which is the main problem in human fetal surgery, is infrequent in the sheep. Our model is reproducible and simulates the surgical endoscopic procedures which will occur in a close future in the human species.
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Affiliation(s)
- M Dreyfus
- Service de Gynécologie et Obstétrique 1, Hôpital de Hautepierre, Strasbourg, France
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Delhomme C, Casset-Senon D, Babuty D, Charniot JC, Fauchier L, Fauchier JP, Philippe L, Cosnay P. [A study of 36 cases of mitral valve prolapse by isotopic ventricular tomography]. Arch Mal Coeur Vaiss 1996; 89:1127-35. [PMID: 8952836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Left and right ventricular wall motion was studied in mitral valve prolapse with or without ventricular arrhythmias. Regional and global ventricular wall motion was evaluated by isotopic methods, based in ejection fraction and Fourier phase analysis representing the progression of wall contraction. The synchronisation of the ventricles was characterized by the difference of the mean phase of each ventricle. The heterogeneity of contraction of each ventricle was defined by the dispersion around the mean (standard deviations of the phases). Fifteen of the 36 patients had complex ventricular arrhythmias (Lown grade > or = III). 12 had LVP and 16 had mitral regurgitation. In mitral valve prolapse, the RV EF was decreased compared with normal controls (30 +/- 9% vs 40 +/- 10% ; p < 0.001), especially in patients with mitral regurgitation (26 +/- 7% vs 30 +/- 10%; p = NS) and complex ventricular arrhythmias (26 +/- 7% vs 32 +/- 10%; p < 0.01). The SDP of the LV was greater than those of controls (18 +/- 11 degrees vs 11 +/- 5 degrees ; p = NS) whereas the SDP of the RV was greater (27 +/- 17 degrees vs 12 +/- 5 degrees ; p < 0.05) especially in those with complex ventricular arrhythmias (36 +/- 21 degrees vs 21 +/- 10 degrees : p < 0.01). The SDP of LV and RV were greater in patients with mitral regurgitation: 20 +/- 11 degrees versus 17 +/- 10 degrees (NS) and 35 +/- 21 degrees versus 20 +/- 8 degrees (p < 0.01). Heterogenous ventricular contraction, more marked in the right ventricle in mitral valve prolapse suggests severe myocardial disruption in this valvular disease, reflected by the high incidence of LVP and complex ventricular arrhythmias.
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Affiliation(s)
- C Delhomme
- Service de cardiologia B, hôpital Trousseau, Tours
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Hirsch JA, Levine MS, Silberg DG, Philippe L. Small-cell carcinoma of the esophagus with regression after combination chemotherapy and radiation therapy. Can Assoc Radiol J 1995; 46:45-7. [PMID: 7834487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The authors present an unusual case of small-cell carcinoma of the esophagus, which manifested on double-contrast esophagography as an ulcerated submucosal mass. The lesion underwent dramatic regression after combination chemotherapy and radiation therapy, which has occasionally been used as an alternative to surgery in patients with this rare but aggressive esophageal neoplasm.
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Affiliation(s)
- J A Hirsch
- Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia 19104
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Dujardin G, Comtet G, Hellner L, Hirayama T, Rose M, Philippe L, Besnard-Ramage MJ. Site specific and state selective photofragmentation of molecular oxygen on Si(111)-(7 x 7). Phys Rev Lett 1994; 73:1727-1730. [PMID: 10056868 DOI: 10.1103/physrevlett.73.1727] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Malengreau F, Vermeersch M, Sporken R, Philippe L, Han BY, Caudano R. Initial growth of AlN on clean and oxidized iron studied by AES and EELS. SURF INTERFACE ANAL 1994. [DOI: 10.1002/sia.740220143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Casset-Senon D, Philippe L, Cosnay P, Lopez-Moutault J, Turot-Bracq V, Fauchier JP, Pottier JM. [Isotopic study of myocardial perfusion and innervation in 28 patients with primary hypertrophic cardiomyopathy: relation to ventricular arrhythmia]. Arch Mal Coeur Vaiss 1994; 87:475-83. [PMID: 7848036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Ventricular arrhythmias are frequent, sometimes complex and severe, in primary hypertrophic cardiomyopathy. They carry a poor prognosis. Some workers have reported that these arrhythmias are more common in patients with abnormal myocardial perfusion. Other groups have underlined the important role of the sympathetic nervous system in the development of ventricular hypertrophy and the genesis of ventricular arrhythmias. Therefore, a population of 28 patients with primary hypertrophic cardiomyopathy (PHCM) were studied by thallium 201 myocardial scintigraphy and sympathetic innervation was assessed using a structural analogue of noradrenaline, meta-iodobenzyl-guanidine (MIBG). Then, perfusion and innervation were correlated with ventricular arrhythmias observed on 24 hours holter monitoring electrocardiogram. Perfusion abnormalities were observed in 60% of patients: stable in mild left ventricular hypertrophy, labile in severe left ventricular hypertrophy. They were not related to the presence of muscular bridges and systolic compression of septal arteries demonstrated by coronary angiography. These perfusion abnormalities were closely correlated to ventricular extrasystoles observed on Holter monitoring. In this series, and compared to controls, the fixation of MIBG as determined by the Heart/Mediastinum (H/M) ratio was significantly decreased (2.27 +/- 0.31 versus 2.57 +/- 0.33 in controls). Uniform myocardial uptake of MIBG with no defect or significant global hypofixation was observed in 32% of PHCM. Regional and occasionally global hypofixation was observed in 68% of patients. In moderate hypertrophy, reduced uptake was not uniform, the lateral wall and apex being the most abnormal. Uptake of MIBG was significantly correlated to septal wall thickness and to left ventricular mass index. These defects were related to abnormal neuronal uptake of MIBG.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- D Casset-Senon
- Service de médecine nucléaire et ultrasons, CHU Trousseau, Tours
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Dujardin G, Hellner L, Philippe L, Besnard-Ramage MJ, Cirkel P. Kinetic-energy distributions of Ar+ ions photodesorbed from argon multilayers. Phys Rev B Condens Matter 1993; 48:14529-14533. [PMID: 10007875 DOI: 10.1103/physrevb.48.14529] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Moussaoui SM, Philippe L, Le Prado N, Garret C. Inhibition of neurogenic inflammation in the meninges by a non-peptide NK1 receptor antagonist, RP 67580. Eur J Pharmacol 1993; 238:421-4. [PMID: 7691624 DOI: 10.1016/0014-2999(93)90879-m] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
RP 67580, a non-peptide NK1 receptor antagonist, inhibited in a stereoselective and dose-dependent manner plasma extravasation caused in the dura mater by intravenous injection of capsaicin in guinea-pigs and of exogenous substance P in rats (ED50 = 35 and 2.5 micrograms/kg i.v., respectively). In the two species, RP 67580 appeared to be more effective in the dura mater than in the peripheral organs. These results indicate that selective NK1 receptor antagonists could be potentially effective for the treatment of migraine headache.
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Affiliation(s)
- S M Moussaoui
- Rhône-Poulenc Rorer S.A., Centre de Recherche de Vitry, Alfortville, Vitry sur Sein, France
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Lambin P, Senet P, Castiaux A, Philippe L. Réponse diélectrique de surface des phonons optiques d'un film de cristal ionique. ACTA ACUST UNITED AC 1993. [DOI: 10.1051/jp1:1993189] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Paillole C, Passa P, Paycha F, Juliard JM, Steg PG, Leblanc H, Philippe L, Gourgon R. Non-invasive identification of severe coronary artery disease in patients with long-standing diabetes mellitus. Eur J Med 1992; 1:464-8. [PMID: 1341205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
OBJECTIVES To detect severe coronary artery disease in asymptomatic middle-aged diabetic patients exposed to coronary artery disease risk factors. PATIENTS AND METHODS Forty-four middle-aged patients (30 to 65 years of age) with a known duration of diabetes exceeding 10 years and at least one additional cardiovascular risk factor were studied. Patients were free of anginal chest pain and had a normal 12-lead ECG at rest. All patients underwent 24-hour ambulatory ECG, maximal bicycle exercise electrocardiography and intravenous dipyridamole thallium myocardial scintigraphy. If one of these 3 non-invasive tests revealed signs of myocardial ischaemia, a coronary angiography was performed. RESULTS Non-invasive investigation yielded the diagnosis of myocardial ischaemia in 9/44 patients (20%). Six of the 9 patients had significant coronary artery stenoses (> 70% narrowing) and 5 exhibited severe triple-vessel disease. With dipyridamole thallium scintigraphy, the positive predictive value for diagnosis of coronary artery disease was optimal. CONCLUSION In diabetic patients with additional coronary risk factors, periodical thorough clinical examination and resting ECG may fail to detect severe coronary disease. More sophisticated cardiovascular non-invasive tests should then be proposed as part of the periodical care of these patients.
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Affiliation(s)
- C Paillole
- Department of Cardiology, Bichat Hospital, Paris, France
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Dujardin G, Hellner L, Philippe L, Azria R, Besnard-Ramage MJ. Photon-stimulated charge transfer in condensed O2 studied by negative-ion desorption. Phys Rev Lett 1991; 67:1844-1847. [PMID: 10044265 DOI: 10.1103/physrevlett.67.1844] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Louthrenoo W, Park YS, Philippe L, Schumacher HR. Localized peripheral calcium oxalate crystal deposition caused by Aspergillus niger infection. J Rheumatol 1990; 17:407-12. [PMID: 2185361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A 70-year-old white man, who was malnourished and demented, presented with a painful black, gangrenous-appearing right foot with a fungating mass and required amputation. Pathological sections of the tissue specimens showed numerous birefringent crystals, which were identified as calcium oxalate. Branching septate hyphae and darkly pigmented fungal fruiting heads with double sterigmata characteristic of Aspergillus niger were also identified in the tissue sections. No systemic or other metabolic causes of oxalosis were found. The calcium oxalate crystal deposition was felt to be secondary to Aspergillus niger infection.
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Affiliation(s)
- W Louthrenoo
- Department of Pathology, Veterans Administration Medical Center, Philadelphia, PA 19104
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