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Wiens RC, Udry A, Beyssac O, Quantin-Nataf C, Mangold N, Cousin A, Mandon L, Bosak T, Forni O, McLennan SM, Sautter V, Brown A, Benzerara K, Johnson JR, Mayhew L, Maurice S, Anderson RB, Clegg SM, Crumpler L, Gabriel TSJ, Gasda P, Hall J, Horgan BHN, Kah L, Legett C, Madariaga JM, Meslin PY, Ollila AM, Poulet F, Royer C, Sharma SK, Siljeström S, Simon JI, Acosta-Maeda TE, Alvarez-Llamas C, Angel SM, Arana G, Beck P, Bernard S, Bertrand T, Bousquet B, Castro K, Chide B, Clavé E, Cloutis E, Connell S, Dehouck E, Dromart G, Fischer W, Fouchet T, Francis R, Frydenvang J, Gasnault O, Gibbons E, Gupta S, Hausrath EM, Jacob X, Kalucha H, Kelly E, Knutsen E, Lanza N, Laserna J, Lasue J, Le Mouélic S, Leveille R, Lopez Reyes G, Lorenz R, Manrique JA, Martinez-Frias J, McConnochie T, Melikechi N, Mimoun D, Montmessin F, Moros J, Murdoch N, Pilleri P, Pilorget C, Pinet P, Rapin W, Rull F, Schröder S, Shuster DL, Smith RJ, Stott AE, Tarnas J, Turenne N, Veneranda M, Vogt DS, Weiss BP, Willis P, Stack KM, Williford KH, Farley KA. Compositionally and density stratified igneous terrain in Jezero crater, Mars. Sci Adv 2022; 8:eabo3399. [PMID: 36007007 PMCID: PMC9410274 DOI: 10.1126/sciadv.abo3399] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
Before Perseverance, Jezero crater's floor was variably hypothesized to have a lacustrine, lava, volcanic airfall, or aeolian origin. SuperCam observations in the first 286 Mars days on Mars revealed a volcanic and intrusive terrain with compositional and density stratification. The dominant lithology along the traverse is basaltic, with plagioclase enrichment in stratigraphically higher locations. Stratigraphically lower, layered rocks are richer in normative pyroxene. The lowest observed unit has the highest inferred density and is olivine-rich with coarse (1.5 millimeters) euhedral, relatively unweathered grains, suggesting a cumulate origin. This is the first martian cumulate and shows similarities to martian meteorites, which also express olivine disequilibrium. Alteration materials including carbonates, sulfates, perchlorates, hydrated silicates, and iron oxides are pervasive but low in abundance, suggesting relatively brief lacustrine conditions. Orbital observations link the Jezero floor lithology to the broader Nili-Syrtis region, suggesting that density-driven compositional stratification is a regional characteristic.
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Affiliation(s)
- Roger C. Wiens
- Space and Planetary Exploration Team, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Arya Udry
- Department of Geoscience, University of Nevada Las Vegas, Las Vegas, NV, USA
| | - Olivier Beyssac
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, Muséum National d’Histoire Naturelle, Paris, France
| | - Cathy Quantin-Nataf
- Laboratoire de Géologie de Lyon, Université de Lyon, Université Claude Bernard Lyon1, Ecole Normale Supérieure de Lyon, Université Jean Monnet Saint Etienne, CNRS, Villeurbanne, France
| | - Nicolas Mangold
- Laboratoire de Planétologie et Géosciences, CNRS UMR 6112, Nantes Université, Université d’Angers, Université du Mans, Nantes, France
| | - Agnès Cousin
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse 3 Paul Sabatier, UPS, CNRS, CNES, Toulouse, France
| | - Lucia Mandon
- Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris-PSL, CNRS, Sorbonne Université, Université de Paris Cité, Meudon, France
| | - Tanja Bosak
- Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Olivier Forni
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse 3 Paul Sabatier, UPS, CNRS, CNES, Toulouse, France
| | | | - Violaine Sautter
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, Muséum National d’Histoire Naturelle, Paris, France
| | | | - Karim Benzerara
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, Muséum National d’Histoire Naturelle, Paris, France
| | - Jeffrey R. Johnson
- Space Exploration Sector, Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
| | - Lisa Mayhew
- Department of Geological Sciences, University of Colorado, Boulder, CO, USA
| | - Sylvestre Maurice
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse 3 Paul Sabatier, UPS, CNRS, CNES, Toulouse, France
| | - Ryan B. Anderson
- U.S. Geological Survey Astrogeology Science Center, Flagstaff, AZ, USA
| | - Samuel M. Clegg
- Space and Planetary Exploration Team, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Larry Crumpler
- New Mexico Museum of Natural History, Albuquerque, NM, USA
| | | | - Patrick Gasda
- Space and Planetary Exploration Team, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - James Hall
- Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Briony H. N. Horgan
- Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, USA
| | - Linda Kah
- Earth and Planetary Sciences, University of Tennessee, Knoxville, TN, USA
| | - Carey Legett
- Space and Planetary Exploration Team, Los Alamos National Laboratory, Los Alamos, NM, USA
| | | | - Pierre-Yves Meslin
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse 3 Paul Sabatier, UPS, CNRS, CNES, Toulouse, France
| | - Ann M. Ollila
- Space and Planetary Exploration Team, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Francois Poulet
- Institut d’Astrophysique Spatiale, CNRS, Univ. Paris-Saclay, Orsay, France
| | - Clement Royer
- Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris-PSL, CNRS, Sorbonne Université, Université de Paris Cité, Meudon, France
| | | | | | - Justin I. Simon
- Center for Isotope Cosmochemistry and Geochronology, NASA Johnson Space Center, Houston, TX, USA
| | | | | | - S. Michael Angel
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, USA
| | - Gorka Arana
- University of Basque Country, UPV/EHU, Leioa, Bilbao, Spain
| | - Pierre Beck
- Institut de Planétologie et d’Astrophysique de Grenoble, CNRS, Université Grenoble Alpes, Grenoble, France
| | - Sylvain Bernard
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, Muséum National d’Histoire Naturelle, Paris, France
| | - Tanguy Bertrand
- Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris-PSL, CNRS, Sorbonne Université, Université de Paris Cité, Meudon, France
| | - Bruno Bousquet
- Centre Lasers Intenses et Applications, CNRS, CEA, Université de Bordeaux, Bordeaux, France
| | - Kepa Castro
- University of Basque Country, UPV/EHU, Leioa, Bilbao, Spain
| | - Baptiste Chide
- Space and Planetary Exploration Team, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Elise Clavé
- Centre Lasers Intenses et Applications, CNRS, CEA, Université de Bordeaux, Bordeaux, France
| | - Ed Cloutis
- University of Winnipeg, Winnipeg, MB, Canada
| | | | - Erwin Dehouck
- Laboratoire de Géologie de Lyon, Université de Lyon, Université Claude Bernard Lyon1, Ecole Normale Supérieure de Lyon, Université Jean Monnet Saint Etienne, CNRS, Villeurbanne, France
| | - Gilles Dromart
- Laboratoire de Géologie de Lyon, Université de Lyon, Université Claude Bernard Lyon1, Ecole Normale Supérieure de Lyon, Université Jean Monnet Saint Etienne, CNRS, Villeurbanne, France
| | | | - Thierry Fouchet
- Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris-PSL, CNRS, Sorbonne Université, Université de Paris Cité, Meudon, France
| | - Raymond Francis
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | | | - Olivier Gasnault
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse 3 Paul Sabatier, UPS, CNRS, CNES, Toulouse, France
| | | | - Sanjeev Gupta
- Department of Earth Science and Engineering, Imperial College London, London, UK
| | | | - Xavier Jacob
- Institut de Mécanique des Fluides, Université de Toulouse 3 Paul Sabatier, Institut National Polytechnique de Toulouse, Toulouse, France
| | | | - Evan Kelly
- University of Hawai‘i, Honolulu, HI, USA
| | - Elise Knutsen
- Laboratoire Atmosphères, Milieux, Observations Spatiales, CNRS, Université Saint-Quentin-en-Yvelines, Université Paris Saclay, Sorbonne Université, Guyancourt, France
| | - Nina Lanza
- Space and Planetary Exploration Team, Los Alamos National Laboratory, Los Alamos, NM, USA
| | | | - Jeremie Lasue
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse 3 Paul Sabatier, UPS, CNRS, CNES, Toulouse, France
| | - Stéphane Le Mouélic
- Laboratoire de Planétologie et Géosciences, CNRS UMR 6112, Nantes Université, Université d’Angers, Université du Mans, Nantes, France
| | | | | | - Ralph Lorenz
- Space Exploration Sector, Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
| | | | | | | | - Noureddine Melikechi
- Department of Physics and Applied Physics, Kennedy College of Sciences, University of Massachusetts, Lowell, MA, USA
| | - David Mimoun
- Institut Supérieur de l’Aéronautique et de l’Espace (ISAE-SUPAERO), Université de Toulouse, Toulouse, France
| | - Franck Montmessin
- Laboratoire Atmosphères, Milieux, Observations Spatiales, CNRS, Université Saint-Quentin-en-Yvelines, Université Paris Saclay, Sorbonne Université, Guyancourt, France
| | | | - Naomi Murdoch
- Institut Supérieur de l’Aéronautique et de l’Espace (ISAE-SUPAERO), Université de Toulouse, Toulouse, France
| | - Paolo Pilleri
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse 3 Paul Sabatier, UPS, CNRS, CNES, Toulouse, France
| | - Cedric Pilorget
- Institut d’Astrophysique Spatiale, CNRS, Univ. Paris-Saclay, Orsay, France
| | - Patrick Pinet
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse 3 Paul Sabatier, UPS, CNRS, CNES, Toulouse, France
| | - William Rapin
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse 3 Paul Sabatier, UPS, CNRS, CNES, Toulouse, France
| | - Fernando Rull
- Research Group ERICA, Universidad de Valladolid, Valladolid, Spain
| | - Susanne Schröder
- Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institute of Optical Sensor Systems, Berlin, Germany
| | - David L. Shuster
- Department of Earth and Planetary Science, University of California, Berkeley, CA, USA
| | | | - Alexander E. Stott
- Institut Supérieur de l’Aéronautique et de l’Espace (ISAE-SUPAERO), Université de Toulouse, Toulouse, France
| | - Jesse Tarnas
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | | | - Marco Veneranda
- Research Group ERICA, Universidad de Valladolid, Valladolid, Spain
| | - David S. Vogt
- Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institute of Optical Sensor Systems, Berlin, Germany
| | - Benjamin P. Weiss
- Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Peter Willis
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - Kathryn M. Stack
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - Kenneth H. Williford
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
- Blue Marble Space Institute of Science, Seattle, WA, USA
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Anderson RB. The taboo of retreat: The politics of sea level rise, managed retreat, and coastal property values in California. Economic Anthropology 2022. [DOI: 10.1002/sea2.12247] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ryan B. Anderson
- Department of Anthropology Santa Clara University Santa Clara CA 95053 USA
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Anderson RB. Made in Baja: The Lives of Farmworkers and Growers behind Mexico's Transnational Agricultural Boom by Christian Zlolniski Oakland: University of California Press, 2019. 256 pp. American Anthropologist 2021. [DOI: 10.1111/aman.13597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Wiens RC, Maurice S, Robinson SH, Nelson AE, Cais P, Bernardi P, Newell RT, Clegg S, Sharma SK, Storms S, Deming J, Beckman D, Ollila AM, Gasnault O, Anderson RB, André Y, Michael Angel S, Arana G, Auden E, Beck P, Becker J, Benzerara K, Bernard S, Beyssac O, Borges L, Bousquet B, Boyd K, Caffrey M, Carlson J, Castro K, Celis J, Chide B, Clark K, Cloutis E, Cordoba EC, Cousin A, Dale M, Deflores L, Delapp D, Deleuze M, Dirmyer M, Donny C, Dromart G, George Duran M, Egan M, Ervin J, Fabre C, Fau A, Fischer W, Forni O, Fouchet T, Fresquez R, Frydenvang J, Gasway D, Gontijo I, Grotzinger J, Jacob X, Jacquinod S, Johnson JR, Klisiewicz RA, Lake J, Lanza N, Laserna J, Lasue J, Le Mouélic S, Legett C, Leveille R, Lewin E, Lopez-Reyes G, Lorenz R, Lorigny E, Love SP, Lucero B, Madariaga JM, Madsen M, Madsen S, Mangold N, Manrique JA, Martinez JP, Martinez-Frias J, McCabe KP, McConnochie TH, McGlown JM, McLennan SM, Melikechi N, Meslin PY, Michel JM, Mimoun D, Misra A, Montagnac G, Montmessin F, Mousset V, Murdoch N, Newsom H, Ott LA, Ousnamer ZR, Pares L, Parot Y, Pawluczyk R, Glen Peterson C, Pilleri P, Pinet P, Pont G, Poulet F, Provost C, Quertier B, Quinn H, Rapin W, Reess JM, Regan AH, Reyes-Newell AL, Romano PJ, Royer C, Rull F, Sandoval B, Sarrao JH, Sautter V, Schoppers MJ, Schröder S, Seitz D, Shepherd T, Sobron P, Dubois B, Sridhar V, Toplis MJ, Torre-Fdez I, Trettel IA, Underwood M, Valdez A, Valdez J, Venhaus D, Willis P. The SuperCam Instrument Suite on the NASA Mars 2020 Rover: Body Unit and Combined System Tests. Space Sci Rev 2021; 217:4. [PMID: 33380752 PMCID: PMC7752893 DOI: 10.1007/s11214-020-00777-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Accepted: 11/27/2020] [Indexed: 05/16/2023]
Abstract
The SuperCam instrument suite provides the Mars 2020 rover, Perseverance, with a number of versatile remote-sensing techniques that can be used at long distance as well as within the robotic-arm workspace. These include laser-induced breakdown spectroscopy (LIBS), remote time-resolved Raman and luminescence spectroscopies, and visible and infrared (VISIR; separately referred to as VIS and IR) reflectance spectroscopy. A remote micro-imager (RMI) provides high-resolution color context imaging, and a microphone can be used as a stand-alone tool for environmental studies or to determine physical properties of rocks and soils from shock waves of laser-produced plasmas. SuperCam is built in three parts: The mast unit (MU), consisting of the laser, telescope, RMI, IR spectrometer, and associated electronics, is described in a companion paper. The on-board calibration targets are described in another companion paper. Here we describe SuperCam's body unit (BU) and testing of the integrated instrument. The BU, mounted inside the rover body, receives light from the MU via a 5.8 m optical fiber. The light is split into three wavelength bands by a demultiplexer, and is routed via fiber bundles to three optical spectrometers, two of which (UV and violet; 245-340 and 385-465 nm) are crossed Czerny-Turner reflection spectrometers, nearly identical to their counterparts on ChemCam. The third is a high-efficiency transmission spectrometer containing an optical intensifier capable of gating exposures to 100 ns or longer, with variable delay times relative to the laser pulse. This spectrometer covers 535-853 nm ( 105 - 7070 cm - 1 Raman shift relative to the 532 nm green laser beam) with 12 cm - 1 full-width at half-maximum peak resolution in the Raman fingerprint region. The BU electronics boards interface with the rover and control the instrument, returning data to the rover. Thermal systems maintain a warm temperature during cruise to Mars to avoid contamination on the optics, and cool the detectors during operations on Mars. Results obtained with the integrated instrument demonstrate its capabilities for LIBS, for which a library of 332 standards was developed. Examples of Raman and VISIR spectroscopy are shown, demonstrating clear mineral identification with both techniques. Luminescence spectra demonstrate the utility of having both spectral and temporal dimensions. Finally, RMI and microphone tests on the rover demonstrate the capabilities of these subsystems as well.
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Affiliation(s)
| | - Sylvestre Maurice
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, UPS, CNRS, Toulouse, France
| | | | | | - Philippe Cais
- Laboratoire d’astrophysique de Bordeaux, Univ. Bordeaux, CNRS, Bordeaux, France
| | - Pernelle Bernardi
- Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris, Meudon, France
| | | | - Sam Clegg
- Los Alamos National Laboratory, Los Alamos, NM USA
| | | | | | | | | | | | - Olivier Gasnault
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, UPS, CNRS, Toulouse, France
| | - Ryan B. Anderson
- U.S. Geological Survey Astrogeology Science Center, Flagstaff, AZ USA
| | - Yves André
- Centre National d’Etudes Spatiales, Toulouse, France
| | | | - Gorka Arana
- University of Basque Country, UPV/EHU, Bilbao, Spain
| | | | - Pierre Beck
- Institut de Planétologie et d’Astrophysique de Grenoble, Université Grenoble Alpes, Grenoble, France
| | | | - Karim Benzerara
- Institut de Minéralogie, Physique des Matériaux et Cosmochimie, CNRS, Museum National d’Histoire Naturelle, Sorbonne Université, Paris, France
| | - Sylvain Bernard
- Institut de Minéralogie, Physique des Matériaux et Cosmochimie, CNRS, Museum National d’Histoire Naturelle, Sorbonne Université, Paris, France
| | - Olivier Beyssac
- Institut de Minéralogie, Physique des Matériaux et Cosmochimie, CNRS, Museum National d’Histoire Naturelle, Sorbonne Université, Paris, France
| | - Louis Borges
- Los Alamos National Laboratory, Los Alamos, NM USA
| | - Bruno Bousquet
- Centre Lasers Intenses et Applications, University of Bordeaux, Bordeaux, France
| | - Kerry Boyd
- Los Alamos National Laboratory, Los Alamos, NM USA
| | | | | | - Kepa Castro
- University of Basque Country, UPV/EHU, Bilbao, Spain
| | - Jorden Celis
- Los Alamos National Laboratory, Los Alamos, NM USA
| | - Baptiste Chide
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, UPS, CNRS, Toulouse, France
- Institut Supérieur de l’Aéronautique et de l’Espace (ISAE), Toulouse, France
| | - Kevin Clark
- Jet Propulsion Laboratory/Caltech, Pasadena, CA USA
| | | | | | - Agnes Cousin
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, UPS, CNRS, Toulouse, France
| | | | | | | | | | | | | | - Gilles Dromart
- Univ Lyon, ENSL, Univ Lyon 1, CNRS, LGL-TPE, 69364 Lyon, France
| | | | | | - Joan Ervin
- Jet Propulsion Laboratory/Caltech, Pasadena, CA USA
| | - Cecile Fabre
- GeoRessources, Université de Lorraine, Nancy, France
| | - Amaury Fau
- Institut de Minéralogie, Physique des Matériaux et Cosmochimie, CNRS, Museum National d’Histoire Naturelle, Sorbonne Université, Paris, France
| | | | - Olivier Forni
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, UPS, CNRS, Toulouse, France
| | - Thierry Fouchet
- Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris, Meudon, France
| | | | | | | | | | | | - Xavier Jacob
- Institut de mécanique des fluides de Toulouse (CNRS, INP, Univ. Toulouse), Toulouse, France
| | - Sophie Jacquinod
- Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris, Meudon, France
| | | | | | - James Lake
- Los Alamos National Laboratory, Los Alamos, NM USA
| | - Nina Lanza
- Los Alamos National Laboratory, Los Alamos, NM USA
| | | | - Jeremie Lasue
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, UPS, CNRS, Toulouse, France
| | - Stéphane Le Mouélic
- Laboratoire de Planétologie et Géodynamique, Université de Nantes, Université d’Angers, CNRS UMR 6112, Nantes, France
| | - Carey Legett
- Los Alamos National Laboratory, Los Alamos, NM USA
| | | | - Eric Lewin
- Institut de Planétologie et d’Astrophysique de Grenoble, Université Grenoble Alpes, Grenoble, France
| | | | - Ralph Lorenz
- Johns Hopkins University Applied Physics Laboratory, Laurel, MD USA
| | - Eric Lorigny
- Centre National d’Etudes Spatiales, Toulouse, France
| | | | | | | | | | - Soren Madsen
- Jet Propulsion Laboratory/Caltech, Pasadena, CA USA
| | - Nicolas Mangold
- Laboratoire de Planétologie et Géodynamique, Université de Nantes, Université d’Angers, CNRS UMR 6112, Nantes, France
| | | | | | | | | | | | | | | | | | - Pierre-Yves Meslin
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, UPS, CNRS, Toulouse, France
| | | | - David Mimoun
- Institut Supérieur de l’Aéronautique et de l’Espace (ISAE), Toulouse, France
| | | | | | - Franck Montmessin
- Laboratoire Atmosphères, Milieux, Observations Spatiales, Paris, France
| | | | - Naomi Murdoch
- Institut Supérieur de l’Aéronautique et de l’Espace (ISAE), Toulouse, France
| | | | - Logan A. Ott
- Los Alamos National Laboratory, Los Alamos, NM USA
| | | | - Laurent Pares
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, UPS, CNRS, Toulouse, France
| | - Yann Parot
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, UPS, CNRS, Toulouse, France
| | | | | | - Paolo Pilleri
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, UPS, CNRS, Toulouse, France
| | - Patrick Pinet
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, UPS, CNRS, Toulouse, France
| | - Gabriel Pont
- Centre National d’Etudes Spatiales, Toulouse, France
| | | | | | - Benjamin Quertier
- Laboratoire d’astrophysique de Bordeaux, Univ. Bordeaux, CNRS, Bordeaux, France
| | | | - William Rapin
- Institut de Minéralogie, Physique des Matériaux et Cosmochimie, CNRS, Museum National d’Histoire Naturelle, Sorbonne Université, Paris, France
| | - Jean-Michel Reess
- Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris, Meudon, France
| | - Amy H. Regan
- Los Alamos National Laboratory, Los Alamos, NM USA
| | | | | | - Clement Royer
- Institut d’Astrophysique Spatiale (IAS), Orsay, France
| | | | | | | | - Violaine Sautter
- Institut de Minéralogie, Physique des Matériaux et Cosmochimie, CNRS, Museum National d’Histoire Naturelle, Sorbonne Université, Paris, France
| | | | - Susanne Schröder
- Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institute of Optical Sensor Systems, Berlin, Germany
| | - Daniel Seitz
- Los Alamos National Laboratory, Los Alamos, NM USA
| | | | | | - Bruno Dubois
- Université de Toulouse; UPS-OMP, Toulouse, France
| | | | - Michael J. Toplis
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, UPS, CNRS, Toulouse, France
| | | | | | | | | | - Jacob Valdez
- Los Alamos National Laboratory, Los Alamos, NM USA
| | - Dawn Venhaus
- Los Alamos National Laboratory, Los Alamos, NM USA
| | - Peter Willis
- Jet Propulsion Laboratory/Caltech, Pasadena, CA USA
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Stack KM, Williams NR, Calef F, Sun VZ, Williford KH, Farley KA, Eide S, Flannery D, Hughes C, Jacob SR, Kah LC, Meyen F, Molina A, Nataf CQ, Rice M, Russell P, Scheller E, Seeger CH, Abbey WJ, Adler JB, Amundsen H, Anderson RB, Angel SM, Arana G, Atkins J, Barrington M, Berger T, Borden R, Boring B, Brown A, Carrier BL, Conrad P, Dypvik H, Fagents SA, Gallegos ZE, Garczynski B, Golder K, Gomez F, Goreva Y, Gupta S, Hamran SE, Hicks T, Hinterman ED, Horgan BN, Hurowitz J, Johnson JR, Lasue J, Kronyak RE, Liu Y, Madariaga JM, Mangold N, McClean J, Miklusicak N, Nunes D, Rojas C, Runyon K, Schmitz N, Scudder N, Shaver E, SooHoo J, Spaulding R, Stanish E, Tamppari LK, Tice MM, Turenne N, Willis PA, Yingst RA. Photogeologic Map of the Perseverance Rover Field Site in Jezero Crater Constructed by the Mars 2020 Science Team. Space Sci Rev 2020; 216:127. [PMID: 33568875 DOI: 10.1007/s11214-020-00762-y] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 11/09/2020] [Indexed: 05/29/2023]
Abstract
The Mars 2020 Perseverance rover landing site is located within Jezero crater, a ∼ 50 km diameter impact crater interpreted to be a Noachian-aged lake basin inside the western edge of the Isidis impact structure. Jezero hosts remnants of a fluvial delta, inlet and outlet valleys, and infill deposits containing diverse carbonate, mafic, and hydrated minerals. Prior to the launch of the Mars 2020 mission, members of the Science Team collaborated to produce a photogeologic map of the Perseverance landing site in Jezero crater. Mapping was performed at a 1:5000 digital map scale using a 25 cm/pixel High Resolution Imaging Science Experiment (HiRISE) orthoimage mosaic base map and a 1 m/pixel HiRISE stereo digital terrain model. Mapped bedrock and surficial units were distinguished by differences in relative brightness, tone, topography, surface texture, and apparent roughness. Mapped bedrock units are generally consistent with those identified in previously published mapping efforts, but this study's map includes the distribution of surficial deposits and sub-units of the Jezero delta at a higher level of detail than previous studies. This study considers four possible unit correlations to explain the relative age relationships of major units within the map area. Unit correlations include previously published interpretations as well as those that consider more complex interfingering relationships and alternative relative age relationships. The photogeologic map presented here is the foundation for scientific hypothesis development and strategic planning for Perseverance's exploration of Jezero crater.
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Affiliation(s)
- Kathryn M Stack
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | - Nathan R Williams
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | - Fred Calef
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | - Vivian Z Sun
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | - Kenneth H Williford
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | | | | | - David Flannery
- Queensland University of Technology, Brisbane, Queensland, Australia
| | - Cory Hughes
- Western Washington University, Bellingham, WA, USA
| | | | - Linda C Kah
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | | | - Antonio Molina
- Centro de Astrobiología, CAB (INTA, CSIC), Madrid, Spain
| | | | - Melissa Rice
- Queensland University of Technology, Brisbane, Queensland, Australia
| | | | - Eva Scheller
- California Institute of Technology, Pasadena, CA, USA
| | | | - William J Abbey
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | | | - Hans Amundsen
- Earth and Planetary Exploration Services, Berlin, Germany
| | | | | | - Gorka Arana
- University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain
| | - James Atkins
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | | | - Tor Berger
- Forsvarets forskingsinstitutt, Kjeller, Norway
| | - Rose Borden
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | - Beau Boring
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | | | - Brandi L Carrier
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | - Pamela Conrad
- Carnegie Institution for Science, Washington, D.C., USA
| | | | | | | | | | - Keenan Golder
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | - Felipe Gomez
- Centro de Astrobiología, CAB (INTA, CSIC), Madrid, Spain
| | - Yulia Goreva
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | | | | | - Taryn Hicks
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | | | | | - Joel Hurowitz
- State University of New York-Stony Brook, Stony Brook, NY, USA
| | | | - Jeremie Lasue
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, Paul Sabatier, Toulouse, France
| | - Rachel E Kronyak
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | - Yang Liu
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | | | - Nicolas Mangold
- Laboratoire Planétologie et Géodynamique, UMR 6112, CNRS, Université de Nantes, Nantes, France
| | | | | | - Daniel Nunes
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | | | - Kirby Runyon
- Johns Hopkins Applied Physics Laboratory, Laurel, MD, USA
| | - Nicole Schmitz
- Deutsches Zentrum Fuer Luft- und Raumfahrt E.V., Cologne, Germany
| | | | - Emily Shaver
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | - Jason SooHoo
- Massachusetts Institute of Technology, Cambridge, MA, USA
| | | | - Evan Stanish
- University of Winnipeg, Winnipeg, Manitoba, Canada
| | - Leslie K Tamppari
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | | | | | - Peter A Willis
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
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6
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Stack KM, Williams NR, Calef F, Sun VZ, Williford KH, Farley KA, Eide S, Flannery D, Hughes C, Jacob SR, Kah LC, Meyen F, Molina A, Nataf CQ, Rice M, Russell P, Scheller E, Seeger CH, Abbey WJ, Adler JB, Amundsen H, Anderson RB, Angel SM, Arana G, Atkins J, Barrington M, Berger T, Borden R, Boring B, Brown A, Carrier BL, Conrad P, Dypvik H, Fagents SA, Gallegos ZE, Garczynski B, Golder K, Gomez F, Goreva Y, Gupta S, Hamran SE, Hicks T, Hinterman ED, Horgan BN, Hurowitz J, Johnson JR, Lasue J, Kronyak RE, Liu Y, Madariaga JM, Mangold N, McClean J, Miklusicak N, Nunes D, Rojas C, Runyon K, Schmitz N, Scudder N, Shaver E, SooHoo J, Spaulding R, Stanish E, Tamppari LK, Tice MM, Turenne N, Willis PA, Yingst RA. Photogeologic Map of the Perseverance Rover Field Site in Jezero Crater Constructed by the Mars 2020 Science Team. Space Sci Rev 2020; 216:127. [PMID: 33568875 PMCID: PMC7116714 DOI: 10.1007/s11214-020-00739-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 09/25/2020] [Indexed: 05/28/2023]
Abstract
The Mars 2020 Perseverance rover landing site is located within Jezero crater, a ∼ 50 km diameter impact crater interpreted to be a Noachian-aged lake basin inside the western edge of the Isidis impact structure. Jezero hosts remnants of a fluvial delta, inlet and outlet valleys, and infill deposits containing diverse carbonate, mafic, and hydrated minerals. Prior to the launch of the Mars 2020 mission, members of the Science Team collaborated to produce a photogeologic map of the Perseverance landing site in Jezero crater. Mapping was performed at a 1:5000 digital map scale using a 25 cm/pixel High Resolution Imaging Science Experiment (HiRISE) orthoimage mosaic base map and a 1 m/pixel HiRISE stereo digital terrain model. Mapped bedrock and surficial units were distinguished by differences in relative brightness, tone, topography, surface texture, and apparent roughness. Mapped bedrock units are generally consistent with those identified in previously published mapping efforts, but this study's map includes the distribution of surficial deposits and sub-units of the Jezero delta at a higher level of detail than previous studies. This study considers four possible unit correlations to explain the relative age relationships of major units within the map area. Unit correlations include previously published interpretations as well as those that consider more complex interfingering relationships and alternative relative age relationships. The photogeologic map presented here is the foundation for scientific hypothesis development and strategic planning for Perseverance's exploration of Jezero crater.
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Affiliation(s)
- Kathryn M Stack
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | - Nathan R Williams
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | - Fred Calef
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | - Vivian Z Sun
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | - Kenneth H Williford
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | | | | | - David Flannery
- Queensland University of Technology, Brisbane, Queensland, Australia
| | - Cory Hughes
- Western Washington University, Bellingham, WA, USA
| | | | - Linda C Kah
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | | | - Antonio Molina
- Centro de Astrobiología, CAB (INTA, CSIC), Madrid, Spain
| | | | - Melissa Rice
- Queensland University of Technology, Brisbane, Queensland, Australia
| | | | - Eva Scheller
- California Institute of Technology, Pasadena, CA, USA
| | | | - William J Abbey
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | | | - Hans Amundsen
- Earth and Planetary Exploration Services, Berlin, Germany
| | | | | | - Gorka Arana
- University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain
| | - James Atkins
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | | | - Tor Berger
- Forsvarets forskingsinstitutt, Kjeller, Norway
| | - Rose Borden
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | - Beau Boring
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | | | - Brandi L Carrier
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | - Pamela Conrad
- Carnegie Institution for Science, Washington, D.C., USA
| | | | | | | | | | - Keenan Golder
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | - Felipe Gomez
- Centro de Astrobiología, CAB (INTA, CSIC), Madrid, Spain
| | - Yulia Goreva
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | | | | | - Taryn Hicks
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | | | | | - Joel Hurowitz
- State University of New York-Stony Brook, Stony Brook, NY, USA
| | | | - Jeremie Lasue
- Institut de Recherche en Astrophysique et Planetologie (IRAP), Université de Toulouse, Paul Sabatier, Toulouse, France
| | - Rachel E Kronyak
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | - Yang Liu
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | | | - Nicolas Mangold
- Laboratoire Planétologie et Géodynamique, UMR 6112, CNRS, Université de Nantes, Nantes, France
| | | | | | - Daniel Nunes
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | | | - Kirby Runyon
- Johns Hopkins Applied Physics Laboratory, Laurel, MD, USA
| | - Nicole Schmitz
- Deutsches Zentrum Fuer Luft- und Raumfahrt E.V., Cologne, Germany
| | | | - Emily Shaver
- University of Tennessee-Knoxville, Knoxville, TN, USA
| | - Jason SooHoo
- Massachusetts Institute of Technology, Cambridge, MA, USA
| | | | - Evan Stanish
- University of Winnipeg, Winnipeg, Manitoba, Canada
| | - Leslie K Tamppari
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | | | | | - Peter A Willis
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
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7
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Schulman PM, Treggiari MM, Yanez ND, Henrikson CA, Jessel PM, Dewland TA, Merkel MJ, Sera V, Harukuni I, Anderson RB, Kahl E, Bingham A, Alkayed N, Stecker EC. Electromagnetic Interference with Protocolized Electrosurgery Dispersive Electrode Positioning in Patients with Implantable Cardioverter Defibrillators. Anesthesiology 2019; 130:530-540. [DOI: 10.1097/aln.0000000000002571] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Abstract
Editor’s Perspective
What We Already Know about This Topic
What This Article Tells Us That Is New
Background
The goal of this study was to determine the occurrence of intraoperative electromagnetic interference from monopolar electrosurgery in patients with an implantable cardioverter defibrillator undergoing surgery. A protocolized approach was used to position the dispersive electrode.
Methods
This was a prospective cohort study including 144 patients with implantable cardioverter defibrillators undergoing surgery between May 2012 and September 2016 at an academic medical center. The primary objectives were to determine the occurrences of electromagnetic interference and clinically meaningful electromagnetic interference (interference that would have resulted in delivery of inappropriate antitachycardia therapy had the antitachycardia therapy not been programmed off) in noncardiac surgeries above the umbilicus, noncardiac surgeries at or below the umbilicus, and cardiac surgeries with the use of an underbody dispersive electrode.
Results
The risks of electromagnetic interference and clinically meaningful electromagnetic interference were 14 of 70 (20%) and 5 of 70 (7%) in above-the-umbilicus surgery, 1 of 40 (2.5%) and 0 of 40 (0%) in below-the-umbilicus surgery, and 23 of 34 (68%) and 10 of 34 (29%) in cardiac surgery. Had conservative programming strategies intended to reduce the risk of inappropriate antitachycardia therapy been employed, the occurrence of clinically meaningful electromagnetic interference would have been 2 of 70 (2.9%) in above-the-umbilicus surgery and 3 of 34 (8.8%) in cardiac surgery.
Conclusions
Despite protocolized dispersive electrode positioning, the risks of electromagnetic interference and clinically meaningful electromagnetic interference with surgery above the umbilicus were high, supporting published recommendations to suspend antitachycardia therapy whenever monopolar electrosurgery is used above the umbilicus. For surgery below the umbilicus, these risks were negligible, implying that suspending antitachycardia therapy is likely unnecessary in these patients. For cardiac surgery, the risks of electromagnetic interference and clinically meaningful electromagnetic interference with an underbody dispersive electrode were high. Conservative programming strategies would not have eliminated the risk of clinically meaningful electromagnetic interference in either noncardiac surgery above the umbilicus or cardiac surgery.
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Affiliation(s)
- Peter M. Schulman
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
| | - Miriam M. Treggiari
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
| | - N. David Yanez
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
| | - Charles A. Henrikson
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
| | - Peter M. Jessel
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
| | - Thomas A. Dewland
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
| | - Matthias J. Merkel
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
| | - Valerie Sera
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
| | - Izumi Harukuni
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
| | - Ryan B. Anderson
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
| | - Ed Kahl
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
| | - Ann Bingham
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
| | - Nabil Alkayed
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
| | - Eric C. Stecker
- From the Department of Anesthesiology and Perioperative Medicine (P.M.S., M.M.T., M.J.M., V.S., I.H., R.B.A., A.B., N.A.) and the Knight Cardiovascular Institute (C.A.H., P.M.J., T.A.D., E.C.S.), Oregon Health and Science University, Portland, Oregon; the School of Public Health, Oregon Health and Science University and Portland State University, Portland, Oregon (N.D.Y.); and Department of Anest
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8
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Condron ME, Jameson NE, Limbach KE, Bingham AE, Sera VA, Anderson RB, Schenning KJ, Yockelson S, Harukuni I, Kahl EA, Dewey E, Pommier SJ, Pommier RF. A prospective study of the pathophysiology of carcinoid crisis. Surgery 2018; 165:158-165. [PMID: 30415870 DOI: 10.1016/j.surg.2018.04.093] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 03/13/2018] [Accepted: 04/03/2018] [Indexed: 11/18/2022]
Abstract
BACKGROUND Sudden massive release of serotonin, histamine, kallikrein, and bradykinin is postulated to cause an intraoperative carcinoid crisis. The exact roles of each of these possible agents, however, remain unknown. Optimal treatment will require an improved understanding of the pathophysiology of the carcinoid crisis. METHODS Carcinoid patients with liver metastases undergoing elective abdominal operations were studied prospectively, using intraoperative, transesophageal echocardiography, pulmonary artery catheterization, and intraoperative blood collection. Serotonin, histamine, kallikrein, and bradykinin levels were analyzed by enzyme-linked immunosorbent assay. RESULTS Of 46 patients studied, 16 had intraoperative hypotensive crises. Preincision serotonin levels were greater in patients who had crises (1,064 vs 453 ng/mL, P = .0064). Preincision hormone profiles were otherwise diverse. Cardiac function on transesophageal echocardiography during the crisis was normal, but intracardiac hypovolemia was observed consistently. Pulmonary artery pressure decreased during crises (P = .025). Linear regression of preincision serotonin levels showed a positive relationship with mid-crisis cardiac index (r = 0.73, P = .017) and a negative relationship with systemic vascular resistance (r=-0.61, P = .015). There were no statistically significant increases of serotonin, histamine, kallikrein, or bradykinin levels during the crises. CONCLUSION The pathophysiology of carcinoid crisis appears consistent with distributive shock. Hormonal secretion from carcinoid tumors varies widely, but increased preincision serotonin levels correlate with crises and with hemodynamic parameters during the crises. Statistically significant increases of serotonin, histamine, kallikrein, or bradykinin during the crises were not observed.
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Affiliation(s)
- Mary E Condron
- Division of Surgical Oncology, Oregon Health & Science University, Portland
| | - Nora E Jameson
- Division of Surgical Oncology, Oregon Health & Science University, Portland
| | - Kristen E Limbach
- Division of Surgical Oncology, Oregon Health & Science University, Portland
| | - Ann E Bingham
- Department of Anesthesiology & Perioperative Medicine, Oregon Health & Science University, Portland
| | - Valerie A Sera
- Department of Anesthesiology & Perioperative Medicine, Oregon Health & Science University, Portland
| | - Ryan B Anderson
- Department of Anesthesiology & Perioperative Medicine, Oregon Health & Science University, Portland
| | - Katie J Schenning
- Department of Anesthesiology & Perioperative Medicine, Oregon Health & Science University, Portland
| | - Shaun Yockelson
- Department of Anesthesiology & Perioperative Medicine, Oregon Health & Science University, Portland
| | - Izumi Harukuni
- Department of Anesthesiology & Perioperative Medicine, Oregon Health & Science University, Portland
| | - Edward A Kahl
- Department of Anesthesiology & Perioperative Medicine, Oregon Health & Science University, Portland
| | - Elizabeth Dewey
- Division of Surgical Oncology, Oregon Health & Science University, Portland
| | - SuEllen J Pommier
- Division of Surgical Oncology, Oregon Health & Science University, Portland
| | - Rodney F Pommier
- Division of Surgical Oncology, Oregon Health & Science University, Portland.
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9
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McLennan SM, Anderson RB, Bell JF, Bridges JC, Calef F, Campbell JL, Clark BC, Clegg S, Conrad P, Cousin A, Des Marais DJ, Dromart G, Dyar MD, Edgar LA, Ehlmann BL, Fabre C, Forni O, Gasnault O, Gellert R, Gordon S, Grant JA, Grotzinger JP, Gupta S, Herkenhoff KE, Hurowitz JA, King PL, Le Mouélic S, Leshin LA, Léveillé R, Lewis KW, Mangold N, Maurice S, Ming DW, Morris RV, Nachon M, Newsom HE, Ollila AM, Perrett GM, Rice MS, Schmidt ME, Schwenzer SP, Stack K, Stolper EM, Sumner DY, Treiman AH, VanBommel S, Vaniman DT, Vasavada A, Wiens RC, Yingst RA. Elemental geochemistry of sedimentary rocks at Yellowknife Bay, Gale crater, Mars. Science 2013; 343:1244734. [PMID: 24324274 DOI: 10.1126/science.1244734] [Citation(s) in RCA: 214] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Sedimentary rocks examined by the Curiosity rover at Yellowknife Bay, Mars, were derived from sources that evolved from an approximately average martian crustal composition to one influenced by alkaline basalts. No evidence of chemical weathering is preserved, indicating arid, possibly cold, paleoclimates and rapid erosion and deposition. The absence of predicted geochemical variations indicates that magnetite and phyllosilicates formed by diagenesis under low-temperature, circumneutral pH, rock-dominated aqueous conditions. Analyses of diagenetic features (including concretions, raised ridges, and fractures) at high spatial resolution indicate that they are composed of iron- and halogen-rich components, magnesium-iron-chlorine-rich components, and hydrated calcium sulfates, respectively. Composition of a cross-cutting dike-like feature is consistent with sedimentary intrusion. The geochemistry of these sedimentary rocks provides further evidence for diverse depositional and diagenetic sedimentary environments during the early history of Mars.
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Affiliation(s)
- S M McLennan
- Department of Geosciences, State University of New York, Stony Brook, NY 11794, USA
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Webster CR, Mahaffy PR, Atreya SK, Flesch GJ, Farley KA, Kemppinen O, Bridges N, Johnson JR, Minitti M, Cremers D, Bell JF, Edgar L, Farmer J, Godber A, Wadhwa M, Wellington D, McEwan I, Newman C, Richardson M, Charpentier A, Peret L, King P, Blank J, Weigle G, Schmidt M, Li S, Milliken R, Robertson K, Sun V, Baker M, Edwards C, Ehlmann B, Farley K, Griffes J, Grotzinger J, Miller H, Newcombe M, Pilorget C, Rice M, Siebach K, Stack K, Stolper E, Brunet C, Hipkin V, Léveillé R, Marchand G, Sánchez PS, Favot L, Cody G, Steele A, Flückiger L, Lees D, Nefian A, Martin M, Gailhanou M, Westall F, Israël G, Agard C, Baroukh J, Donny C, Gaboriaud A, Guillemot P, Lafaille V, Lorigny E, Paillet A, Pérez R, Saccoccio M, Yana C, Armiens‐Aparicio C, Rodríguez JC, Blázquez IC, Gómez FG, Elvira JG, Hettrich S, Malvitte AL, Jiménez MM, Martínez-Frías J, Soler JM, Martín-Torres FJ, Jurado AM, Mora-Sotomayor L, Caro GM, López SN, Peinado-González V, Pla-García J, Manfredi JAR, Romeral-Planelló JJ, Fuentes SAS, Martinez ES, Redondo JT, Urqui-O'Callaghan R, Mier MPZ, Chipera S, Lacour JL, Mauchien P, Sirven JB, Manning H, Fairén A, Hayes A, Joseph J, Squyres S, Sullivan R, Thomas P, Dupont A, Lundberg A, Melikechi N, Mezzacappa A, DeMarines J, Grinspoon D, Reitz G, Prats B, Atlaskin E, Genzer M, Harri AM, Haukka H, Kahanpää H, Kauhanen J, Kemppinen O, Paton M, Polkko J, Schmidt W, Siili T, Fabre C, Wray J, Wilhelm MB, Poitrasson F, Patel K, Gorevan S, Indyk S, Paulsen G, Gupta S, Bish D, Schieber J, Gondet B, Langevin Y, Geffroy C, Baratoux D, Berger G, Cros A, d’Uston C, Forni O, Gasnault O, Lasue J, Lee QM, Maurice S, Meslin PY, Pallier E, Parot Y, Pinet P, Schröder S, Toplis M, Lewin É, Brunner W, Heydari E, Achilles C, Oehler D, Sutter B, Cabane M, Coscia D, Israël G, Szopa C, Dromart G, Robert F, Sautter V, Le Mouélic S, Mangold N, Nachon M, Buch A, Stalport F, Coll P, François P, Raulin F, Teinturier S, Cameron J, Clegg S, Cousin A, DeLapp D, Dingler R, Jackson RS, Johnstone S, Lanza N, Little C, Nelson T, Wiens RC, Williams RB, Jones A, Kirkland L, Treiman A, Baker B, Cantor B, Caplinger M, Davis S, Duston B, Edgett K, Fay D, Hardgrove C, Harker D, Herrera P, Jensen E, Kennedy MR, Krezoski G, Krysak D, Lipkaman L, Malin M, McCartney E, McNair S, Nixon B, Posiolova L, Ravine M, Salamon A, Saper L, Stoiber K, Supulver K, Van Beek J, Van Beek T, Zimdar R, French KL, Iagnemma K, Miller K, Summons R, Goesmann F, Goetz W, Hviid S, Johnson M, Lefavor M, Lyness E, Breves E, Dyar MD, Fassett C, Blake DF, Bristow T, DesMarais D, Edwards L, Haberle R, Hoehler T, Hollingsworth J, Kahre M, Keely L, McKay C, Wilhelm MB, Bleacher L, Brinckerhoff W, Choi D, Conrad P, Dworkin JP, Eigenbrode J, Floyd M, Freissinet C, Garvin J, Glavin D, Harpold D, Jones A, Mahaffy P, Martin DK, McAdam A, Pavlov A, Raaen E, Smith MD, Stern J, Tan F, Trainer M, Meyer M, Posner A, Voytek M, Anderson RC, Aubrey A, Beegle LW, Behar A, Blaney D, Brinza D, Calef F, Christensen L, Crisp JA, DeFlores L, Ehlmann B, Feldman J, Feldman S, Flesch G, Hurowitz J, Jun I, Keymeulen D, Maki J, Mischna M, Morookian JM, Parker T, Pavri B, Schoppers M, Sengstacken A, Simmonds JJ, Spanovich N, Juarez MDLT, Vasavada AR, Webster CR, Yen A, Archer PD, Cucinotta F, Jones JH, Ming D, Morris RV, Niles P, Rampe E, Nolan T, Fisk M, Radziemski L, Barraclough B, Bender S, Berman D, Dobrea EN, Tokar R, Vaniman D, Williams RME, Yingst A, Lewis K, Leshin L, Cleghorn T, Huntress W, Manhès G, Hudgins J, Olson T, Stewart N, Sarrazin P, Grant J, Vicenzi E, Wilson SA, Bullock M, Ehresmann B, Hamilton V, Hassler D, Peterson J, Rafkin S, Zeitlin C, Fedosov F, Golovin D, Karpushkina N, Kozyrev A, Litvak M, Malakhov A, Mitrofanov I, Mokrousov M, Nikiforov S, Prokhorov V, Sanin A, Tretyakov V, Varenikov A, Vostrukhin A, Kuzmin R, Clark B, Wolff M, McLennan S, Botta O, Drake D, Bean K, Lemmon M, Schwenzer SP, Anderson RB, Herkenhoff K, Lee EM, Sucharski R, Hernández MÁDP, Ávalos JJB, Ramos M, Kim MH, Malespin C, Plante I, Muller JP, Navarro-González R, Ewing R, Boynton W, Downs R, Fitzgibbon M, Harshman K, Morrison S, Dietrich W, Kortmann O, Palucis M, Sumner DY, Williams A, Lugmair G, Wilson MA, Rubin D, Jakosky B, Balic-Zunic T, Frydenvang J, Jensen JK, Kinch K, Koefoed A, Madsen MB, Stipp SLS, Boyd N, Campbell JL, Gellert R, Perrett G, Pradler I, VanBommel S, Jacob S, Owen T, Rowland S, Atlaskin E, Savijärvi H, Boehm E, Böttcher S, Burmeister S, Guo J, Köhler J, García CM, Mueller-Mellin R, Wimmer-Schweingruber R, Bridges JC, McConnochie T, Benna M, Franz H, Bower H, Brunner A, Blau H, Boucher T, Carmosino M, Atreya S, Elliott H, Halleaux D, Rennó N, Wong M, Pepin R, Elliott B, Spray J, Thompson L, Gordon S, Newsom H, Ollila A, Williams J, Vasconcelos P, Bentz J, Nealson K, Popa R, Kah LC, Moersch J, Tate C, Day M, Kocurek G, Hallet B, Sletten R, Francis R, McCullough E, Cloutis E, ten Kate IL, Kuzmin R, Arvidson R, Fraeman A, Scholes D, Slavney S, Stein T, Ward J, Berger J, Moores JE. Low Upper Limit to Methane Abundance on Mars. Science 2013; 342:355-7. [DOI: 10.1126/science.1242902] [Citation(s) in RCA: 93] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
| | | | - Sushil K. Atreya
- Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI 48109, USA
| | - Gregory J. Flesch
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
| | - Kenneth A. Farley
- Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
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Stolper EM, Baker MB, Newcombe ME, Schmidt ME, Treiman AH, Cousin A, Dyar MD, Fisk MR, Gellert R, King PL, Leshin L, Maurice S, McLennan SM, Minitti ME, Perrett G, Rowland S, Sautter V, Wiens RC, Kemppinen O, Bridges N, Johnson JR, Cremers D, Bell JF, Edgar L, Farmer J, Godber A, Wadhwa M, Wellington D, McEwan I, Newman C, Richardson M, Charpentier A, Peret L, Blank J, Weigle G, Li S, Milliken R, Robertson K, Sun V, Edwards C, Ehlmann B, Farley K, Griffes J, Grotzinger J, Miller H, Pilorget C, Rice M, Siebach K, Stack K, Brunet C, Hipkin V, Léveillé R, Marchand G, Sánchez PS, Favot L, Cody G, Steele A, Flückiger L, Lees D, Nefian A, Martin M, Gailhanou M, Westall F, Israël G, Agard C, Baroukh J, Donny C, Gaboriaud A, Guillemot P, Lafaille V, Lorigny E, Paillet A, Pérez R, Saccoccio M, Yana C, Armiens‐Aparicio C, Rodríguez JC, Blázquez IC, Gómez FG, Gómez-Elvira J, Hettrich S, Malvitte AL, Jiménez MM, Martínez-Frías J, Martín-Soler J, Martín-Torres FJ, Jurado AM, Mora-Sotomayor L, Caro GM, López SN, Peinado-González V, Pla-García J, Manfredi JAR, Romeral-Planelló JJ, Fuentes SAS, Martinez ES, Redondo JT, Urqui-O'Callaghan R, Mier MPZ, Chipera S, Lacour JL, Mauchien P, Sirven JB, Manning H, Fairén A, Hayes A, Joseph J, Squyres S, Sullivan R, Thomas P, Dupont A, Lundberg A, Melikechi N, Mezzacappa A, DeMarines J, Grinspoon D, Reitz G, Prats B, Atlaskin E, Genzer M, Harri AM, Haukka H, Kahanpää H, Kauhanen J, Kemppinen O, Paton M, Polkko J, Schmidt W, Siili T, Fabre C, Wray J, Wilhelm MB, Poitrasson F, Patel K, Gorevan S, Indyk S, Paulsen G, Gupta S, Bish D, Schieber J, Gondet B, Langevin Y, Geffroy C, Baratoux D, Berger G, Cros A, d’Uston C, Forni O, Gasnault O, Lasue J, Lee QM, Meslin PY, Pallier E, Parot Y, Pinet P, Schröder S, Toplis M, Lewin É, Brunner W, Heydari E, Achilles C, Oehler D, Sutter B, Cabane M, Coscia D, Israël G, Szopa C, Teinturier S, Dromart G, Robert F, Le Mouélic S, Mangold N, Nachon M, Buch A, Stalport F, Coll P, François P, Raulin F, Cameron J, Clegg S, DeLapp D, Dingler R, Jackson RS, Johnstone S, Lanza N, Little C, Nelson T, Williams RB, Kirkland L, Baker B, Cantor B, Caplinger M, Davis S, Duston B, Edgett K, Fay D, Hardgrove C, Harker D, Herrera P, Jensen E, Kennedy MR, Krezoski G, Krysak D, Lipkaman L, Malin M, McCartney E, McNair S, Nixon B, Posiolova L, Ravine M, Salamon A, Saper L, Stoiber K, Supulver K, Van Beek J, Van Beek T, Zimdar R, French KL, Iagnemma K, Miller K, Summons R, Goesmann F, Goetz W, Hviid S, Johnson M, Lefavor M, Lyness E, Breves E, Fassett C, Blake DF, Bristow T, DesMarais D, Edwards L, Haberle R, Hoehler T, Hollingsworth J, Kahre M, Keely L, McKay C, Wilhelm MB, Bleacher L, Brinckerhoff W, Choi D, Conrad P, Dworkin JP, Eigenbrode J, Floyd M, Freissinet C, Garvin J, Glavin D, Harpold D, Mahaffy P, Martin DK, McAdam A, Pavlov A, Raaen E, Smith MD, Stern J, Tan F, Trainer M, Meyer M, Posner A, Voytek M, Anderson RC, Aubrey A, Beegle LW, Behar A, Blaney D, Brinza D, Calef F, Christensen L, Crisp J, DeFlores L, Ehlmann B, Feldman J, Feldman S, Flesch G, Hurowitz J, Jun I, Keymeulen D, Maki J, Mischna M, Morookian JM, Parker T, Pavri B, Schoppers M, Sengstacken A, Simmonds JJ, Spanovich N, Juarez MDLT, Vasavada A, Webster CR, Yen A, Archer PD, Cucinotta F, Jones JH, Ming D, Morris RV, Niles P, Rampe E, Nolan T, Radziemski L, Barraclough B, Bender S, Berman D, Dobrea EN, Tokar R, Vaniman D, Williams RME, Yingst A, Lewis K, Cleghorn T, Huntress W, Manhès G, Hudgins J, Olson T, Stewart N, Sarrazin P, Grant J, Vicenzi E, Wilson SA, Bullock M, Ehresmann B, Hamilton V, Hassler D, Peterson J, Rafkin S, Zeitlin C, Fedosov F, Golovin D, Karpushkina N, Kozyrev A, Litvak M, Malakhov A, Mitrofanov I, Mokrousov M, Nikiforov S, Prokhorov V, Sanin A, Tretyakov V, Varenikov A, Vostrukhin A, Kuzmin R, Clark B, Wolff M, Botta O, Drake D, Bean K, Lemmon M, Schwenzer SP, Anderson RB, Herkenhoff K, Lee EM, Sucharski R, Hernández MÁDP, Ávalos JJB, Ramos M, Jones A, Kim MH, Malespin C, Plante I, Muller JP, Navarro-González R, Ewing R, Boynton W, Downs R, Fitzgibbon M, Harshman K, Morrison S, Dietrich W, Kortmann O, Palucis M, Sumner DY, Williams A, Lugmair G, Wilson MA, Rubin D, Jakosky B, Balic-Zunic T, Frydenvang J, Jensen JK, Kinch K, Koefoed A, Madsen MB, Stipp SLS, Boyd N, Campbell JL, Pradler I, VanBommel S, Jacob S, Owen T, Atlaskin E, Savijärvi H, Boehm E, Böttcher S, Burmeister S, Guo J, Köhler J, García CM, Mueller-Mellin R, Wimmer-Schweingruber R, Bridges JC, McConnochie T, Benna M, Franz H, Bower H, Brunner A, Blau H, Boucher T, Carmosino M, Atreya S, Elliott H, Halleaux D, Rennó N, Wong M, Pepin R, Elliott B, Spray J, Thompson L, Gordon S, Newsom H, Ollila A, Williams J, Vasconcelos P, Bentz J, Nealson K, Popa R, Kah LC, Moersch J, Tate C, Day M, Kocurek G, Hallet B, Sletten R, Francis R, McCullough E, Cloutis E, ten Kate IL, Kuzmin R, Arvidson R, Fraeman A, Scholes D, Slavney S, Stein T, Ward J, Berger J, Moores JE. The Petrochemistry of Jake_M: A Martian Mugearite. Science 2013; 341:1239463. [DOI: 10.1126/science.1239463] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
| | | | | | - M. E. Schmidt
- Brock University, St. Catharines, Ontario L2T 3V8, Canada
| | - A. H. Treiman
- Lunar and Planetary Institute, Houston, TX 77058, USA
| | - A. Cousin
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
- Institut de Recherches en Astrophysique et Planétologie, 31028 Toulouse, France
| | - M. D. Dyar
- Mount Holyoke College, South Hadley, MA 01075, USA
| | - M. R. Fisk
- Oregon State University, Corvallis, OR 97331, USA
| | - R. Gellert
- University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - P. L. King
- Research School of Earth Sciences, Australian National University, Acton, ACT 0200, Australia
| | - L. Leshin
- Rensselaer Polytechnic Institute, Troy, NY 12180, USA
| | - S. Maurice
- Institut de Recherches en Astrophysique et Planétologie, 31028 Toulouse, France
| | - S. M. McLennan
- The State University of New York, Stony Brook, NY 11794, USA
| | - M. E. Minitti
- Applied Physics Laboratory, The Johns Hopkins University, Baltimore, MD 20723, USA
| | - G. Perrett
- University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - S. Rowland
- University of Hawaii, Honolulu, HI 96822, USA
| | - V. Sautter
- Laboratoire de Minéralogie et Cosmochimie du Muséum, 75005 Paris, France
| | - R. C. Wiens
- Los Alamos National Laboratory, Los Alamos, NM 87545, USA
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Williams RME, Grotzinger JP, Dietrich WE, Gupta S, Sumner DY, Wiens RC, Mangold N, Malin MC, Edgett KS, Maurice S, Forni O, Gasnault O, Ollila A, Newsom HE, Dromart G, Palucis MC, Yingst RA, Anderson RB, Herkenhoff KE, Le Mouélic S, Goetz W, Madsen MB, Koefoed A, Jensen JK, Bridges JC, Schwenzer SP, Lewis KW, Stack KM, Rubin D, Kah LC, Bell JF, Farmer JD, Sullivan R, Van Beek T, Blaney DL, Pariser O, Deen RG. Martian fluvial conglomerates at Gale crater. Science 2013; 340:1068-72. [PMID: 23723230 DOI: 10.1126/science.1237317] [Citation(s) in RCA: 281] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Observations by the Mars Science Laboratory Mast Camera (Mastcam) in Gale crater reveal isolated outcrops of cemented pebbles (2 to 40 millimeters in diameter) and sand grains with textures typical of fluvial sedimentary conglomerates. Rounded pebbles in the conglomerates indicate substantial fluvial abrasion. ChemCam emission spectra at one outcrop show a predominantly feldspathic composition, consistent with minimal aqueous alteration of sediments. Sediment was mobilized in ancient water flows that likely exceeded the threshold conditions (depth 0.03 to 0.9 meter, average velocity 0.20 to 0.75 meter per second) required to transport the pebbles. Climate conditions at the time sediment was transported must have differed substantially from the cold, hyper-arid modern environment to permit aqueous flows across several kilometers.
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Wallace AS, Tan MX, Schachner M, Anderson RB. L1cam acts as a modifier gene for members of the endothelin signalling pathway during enteric nervous system development. Neurogastroenterol Motil 2011; 23:e510-22. [PMID: 21395909 DOI: 10.1111/j.1365-2982.2011.01692.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND The enteric nervous system originates from neural crest cells that migrate into the embryonic foregut and then sequentially colonize the midgut and hindgut. Defects in neural crest migration result in regions of the gut that lack enteric ganglia, a condition in humans called Hirschsprung's disease. The high degree of phenotypic variability reported in Hirschsprung's disease suggests the involvement of modifier genes. METHODS We used a two-locus complementation approach to screen for genetic interactions between L1cam and members of the endothelin signalling pathway. Immunohistochemistry was used to label PGP9.5(+) enteric neurons and Sox10(+) neural crest-derived cells in wholemount preparations of embryonic gut. Key Results Loss or haploinsufficiency of L1cam significantly increased the severity of aganglionosis in Et-3 and Ednrb null mutant embryos. Furthermore, the colonization of the developing gut by neural crest-derived cells was significantly delayed in L1cam(-/y) ; Et-3(-/-) and L1cam(-/y) ;Ednrb(sl/sl) embryos. CONCLUSIONS & INFERENCES We have identified the X-linked gene, L1cam, as the first modifier gene for members of the endothelin signalling pathway during development of the enteric nervous system. Mutations in L1CAM may act to modulate the severity of aganglionosis in some cases of Hirschsprung's disease.
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Affiliation(s)
- A S Wallace
- Department of Anatomy and Cell Biology, University of Melbourne, Parkville, Melbourne, Victoria, Australia
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Emerman SH, Prasai T, Anderson RB, Palmer MA. Arsenic contamination of groundwater in the Kathmandu Valley, Nepal, as a consequence of rapid erosion. ACTA ACUST UNITED AC 2010. [DOI: 10.3126/jngs.v40i0.23595] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Elevated levels of arsenic (As) in groundwater in the flood plain of the Ganges River have been well-documented over the past decades. The objective of this study was to measure As and the transition elements normally associated with As in the Kathmandu Valley in Nepal, a heavily populated tectonic valley in the upper reaches of the Ganges River system. Water samples were collected from six shallow tubewells (depth < 50 m), eight deep tubewells and 13 dug wells and stone spouts. Electrical conductivity, temperature and pH were measured on-site and concentrations of As, Fe, Cu, Ni, Co, Mn, Zn and Cr were measured with a spectrophotometer. Five tubewells and four dug wells had As levels exceeding the Nepal Interim Standard (As = 0.05 mg/L). There was no statistically significant clustering of As levels either with depth or horizontal location. Arsenic was uncorrelated with either Fe (R2 = 0.096), Mn (R2 = 0.0004) or any combination of transition elements (R2 < 0.083), which is inconsistent with both the reduction-dissolution and the sulfide oxidation models for As release. The geometric mean As level of groundwater (As = 0.015 mg/L) was indistinguishable from the geometric mean As level of surface water (As = 0.013 mg/L) obtained from 48 river samples from the Kathmandu Valley in a previous study. We are suggesting that elevated groundwater As results not from subsurface redox conditions, but from losing streams with elevated As, which is a consequence of rapid erosion caused by a combination of monsoon climate, tectonic uplift and deforestation.
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Hao MM, Moore RE, Roberts RR, Nguyen T, Furness JB, Anderson RB, Young HM. The role of neural activity in the migration and differentiation of enteric neuron precursors. Neurogastroenterol Motil 2010; 22:e127-37. [PMID: 20082666 DOI: 10.1111/j.1365-2982.2009.01462.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND As they migrate through the developing gut, a sub-population of enteric neural crest-derived cells (ENCCs) begins to differentiate into neurons. The early appearance of neurons raises the possibility that electrical activity and neurotransmitter release could influence the migration or differentiation of ENNCs. METHODS The appearance of neuronal sub-types in the gut of embryonic mice was examined using immunohistochemistry. The effects of blocking various forms of neural activity on ENCC migration and neuronal differentiation were examined using explants of cultured embryonic gut. KEY RESULTS Nerve fibers were present in close apposition to many ENCCs. Commencing at E11.5, neuronal nitric oxide synthase (nNOS), calbindin and IK(Ca) channel immunoreactivities were shown by sub-populations of enteric neurons. In cultured explants of embryonic gut, tetrodotoxin (TTX, an inhibitor of action potential generation), nitro-L-arginine (NOLA, an inhibitor of nitric oxide synthesis) and clotrimazole (an IK(Ca) channel blocker) did not affect the rate of ENCC migration, but tetanus toxin (an inhibitor of SNARE-mediated vesicle fusion) significantly impaired ENCC migration as previously reported. In explants of E11.5 and E12.5 hindgut grown in the presence of TTX or tetanus toxin there was a decrease in the number nNOS+ neurons close to the migratory wavefront, but no significant difference in the proportion of all ENCC that expressed the pan-neuronal marker, Hu. CONCLUSIONS & INFERENCES (i) Some enteric neuron sub-types are present very early during the development of the enteric nervous system. (ii) The rate of differentiation of some sub-types of enteric neurons appears to be influenced by TTX- and tetanus toxin-sensitive mechanisms.
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Affiliation(s)
- M M Hao
- Department of Anatomy & Cell Biology, University of Melbourne, Vic., Australia
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Hotta R, Anderson RB, Kobayashi K, Newgreen DF, Young HM. Effects of tissue age, presence of neurones and endothelin-3 on the ability of enteric neurone precursors to colonize recipient gut: implications for cell-based therapies. Neurogastroenterol Motil 2010; 22:331-e86. [PMID: 19775251 DOI: 10.1111/j.1365-2982.2009.01411.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
BACKGROUND Most enteric neurones arise from neural crest cells that originate in the post-otic hindbrain, and migrate into and along the developing gastrointestinal tract. There is currently great interest in the possibility of cell therapy to replace diseased or absent enteric neurones in patients with enteric neuropathies, such as Hirschsprung's disease. However, it is unclear whether neural crest stem/progenitor cells will be able to colonize colon (i) in which the mesenchyme has differentiated into distinct layers, (ii) that already contains enteric neurones or (iii) that lacks a gene expressed by the gut mesenchyme, such as endothelin-3 (Et-3). METHODS Co-cultures were used to examine the ability of enteric neural crest-derived cells (ENCCs) from E11.5 mouse gut to colonize a variety of recipient hindguts. KEY RESULTS Enteric neural crest-derived cells migrated and gave rise to neurones in E14.5 and E16.5 aneural colon in which the external muscle layers had differentiated, but they did not migrate as far as in younger colon. There was no evidence of altered ENCC proliferation, cell death or neuronal differentiation in older recipient explants. Enteric neural crest-derived cells failed to enter most recipient E14.5 and E16.5 colon explants already containing enteric neurones, and the few that did showed very limited migration. Finally, ENCCs migrated a shorter distance and a higher proportion expressed the pan-neuronal marker, Hu, in recipient E11.5 Et-3(-/-) colon compared to wild-type recipient colon. CONCLUSIONS & INFERENCES Age and an absence of Et-3 from the recipient gut both significantly reduced but did not prevent ENCC migration, but the presence of neurones almost totally prevented ENCC migration.
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Affiliation(s)
- R Hotta
- Department of Anatomy & Cell Biology, University of Melbourne, Victoria, Australia
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Anderson RB, Cianciolo GJ, Kennedy MN, Pizzo SV. Alpha 2-macroglobulin binds CpG oligodeoxynucleotides and enhances their immunostimulatory properties by a receptor-dependent mechanism. J Leukoc Biol 2007; 83:381-92. [PMID: 17967834 DOI: 10.1189/jlb.0407236] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
CpG oligodeoxynucleotides (ODN) stimulate the immune system and are under evaluation as treatments and vaccine adjuvants for infectious diseases, cancer, and immune system disorders. Although they have shown promising results in numerous clinical trials, the ultimate use of CpG ODN-based therapeutics may hinge on improved pharmacokinetics and reduced systemic side-effects. CpG ODN efficacy and potency might be enhanced greatly by packaging them into particles that protect them from degradation and specifically target them for uptake by immune-competent cells. The plasma proteinase inhibitor alpha 2-macroglobulin (alpha 2M) binds numerous biologically active macromolecules, including cytokines, chemokines, and growth factors, and can modulate their activity. Molecules bound to alpha 2M are protected from interactions with neighboring macromolecules and are targeted for receptor-mediated uptake by immune-competent cells. Here, we report that activated alpha 2M (alpha 2M*) binds CpG ODN and enhances their immunostimulatory properties significantly. Murine macrophages treated with alpha 2M*-ODN complexes respond more rapidly and produce a greater cytokine response than induced by free CpG ODN. Using human PBMC, alpha 2M*-ODN complexes exhibit fourfold enhanced potency and 15-fold greater efficacy for stimulating production of inflammatory cytokines. alpha 2M* targets delivery of CpG ODN specifically to immune-competent cells, which endocytose the complexes sixfold more rapidly than free CpG ODN. CpG ODN bound to alpha 2M* are also protected from degradation by nucleases. This novel targeting technology may improve CpG ODN-based therapeutics by increasing efficacy at reduced doses, thus reducing side-effects and cost.
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Affiliation(s)
- Ryan B Anderson
- Department of Pathology, Duke University Medical Center, Durham, NC 27710, USA
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Anderson RB, Bergner AJ, Taniguchi M, Fujisawa H, Forrai A, Robb L, Young HM. Effects of different regions of the developing gut on the migration of enteric neural crest-derived cells: A role for Sema3A, but not Sema3F. Dev Biol 2007; 305:287-99. [PMID: 17362911 DOI: 10.1016/j.ydbio.2007.02.020] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2007] [Revised: 02/13/2007] [Accepted: 02/13/2007] [Indexed: 11/25/2022]
Abstract
The enteric nervous system arises from vagal (caudal hindbrain) and sacral level neural crest-derived cells that migrate into and along the developing gut. Data from previous studies have suggested that (i) there may be gradients along the gut that induce the caudally directed migration of vagal enteric neural precursors (ENPs), (ii) exposure to the caecum might alter the migratory ability of vagal ENPs and (iii) Sema3A might regulate the entry into the hindgut of ENPs derived from sacral neural crest. Using co-cultures we show that there is no detectable gradient of chemoattractive molecules along the pre-caecal gut that specifically promotes the caudally directed migration of vagal ENPs, although vagal ENPs migrate faster caudally than rostrally along explants of hindgut. Exposure to the caecum did not alter the rate at which ENPs colonized explants of hindgut, but it did alter the ability of ENPs to colonize the midgut. The co-cultures also revealed that there is localized expression of a repulsive cue in the distal hindgut, which might delay the entry of sacral ENPs. We show that Sema3A is expressed by the hindgut mesenchyme and its receptor, neuropilin-1, is expressed by migrating ENPs. Furthermore, there is premature entry of sacral ENPs and extrinsic axons into the distal hindgut of fetal mice lacking Sema3A. These data show that Sema3A expressed by the distal hindgut regulates the entry of sacral ENPs and extrinsic axons into the hindgut. ENPs did not express neuropilin-2 and there was no detectable change in the timetable by which ENPs colonize the gut in mice lacking neuropilin-2.
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Affiliation(s)
- R B Anderson
- Department of Anatomy and Cell Biology, University of Melbourne, 3010, VIC, Australia.
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Broglio SP, Ferrara MS, Piland SG, Anderson RB, Collie A. Concussion history is not a predictor of computerised neurocognitive performance. Br J Sports Med 2006; 40:802-5; discussion 802-5. [PMID: 16929049 PMCID: PMC2564398 DOI: 10.1136/bjsm.2006.028019] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.1] [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: 11/03/2022]
Abstract
BACKGROUND The long term effects of self reported concussion on neurocognitive functioning have been found to be variable. OBJECTIVES To evaluate cognitive performance on the Headminder concussion resolution index (CRI) and ImPACT assessment tests of subjects with and without a history of self reported concussion. METHODS A retrospective analysis was completed on 235 Headminder CRI baseline assessments and 264 ImPACT baseline assessments. Participants were divided into four groups on the basis of reported number of concussions (zero, one, two, or three). Multivariate analysis of variance was used to evaluate differences between the concussion history groups on the two computer based concussion assessment programs. RESULTS Multivariate analysis of variance indicated no significant difference between those with and without a history of concussion on the CRI (Lambda = 0.963, F((15, 627.05)) = 0.57, p = 0.898). It also revealed no significant differences between groups on the ImPACT test (Lambda = 0.951, F((12, 672.31)) = 1.07, p = 0.381). CONCLUSIONS The results suggest that either long term cognitive decrements may not be associated with a history of concussion or the decrements may be subtle and undetectable by these computer programs.
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Affiliation(s)
- S P Broglio
- Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Champaign, IL, USA
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Anderson RB, Stewart AL, Young HM. Phenotypes of neural-crest-derived cells in vagal and sacral pathways. Cell Tissue Res 2005; 323:11-25. [PMID: 16133146 DOI: 10.1007/s00441-005-0047-6] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2005] [Accepted: 06/22/2005] [Indexed: 01/12/2023]
Abstract
Enteric neurons arise from vagal and sacral level neural crest cells. To examine the phenotype of neural-crest-derived cells in vagal and sacral pathways, we used antisera to Sox10, p75, Phox2b, and Hu, and transgenic mice in which the expression of green fluorescent protein was under the control of the Ret promoter. Sox10 was expressed prior to the emigration of vagal cells, whereas p75 was expressed shortly after their emigration. Most crest-derived cells that emigrated adjacent to somites 1-4 migrated along a pathway that was later followed by the vagus nerve. A sub-population of these vagal cells coalesced to form vagal ganglia, whereas others continued their migration towards the heart and gut. Cells that coalesced into vagal ganglia showed a different phenotype from cells in the migratory streams proximal and distal to the ganglia. Only a sub-population of the vagal cells that first entered the foregut expressed Phox2b or Ret. Sacral neural crest cells gave rise to pelvic ganglia and some neurons in the hindgut. The pathways of sacral neural crest cells were examined by using DbetaH-nlacZ mice. Sacral cells appeared to enter the distal hindgut around embryonic day 14.5. Very few of the previously demonstrated, but rare, neurons that were present in the large intestine of Ret null mutants and that presumably arose from the sacral neural crest expressed nitric oxide synthase, unlike their counterparts in Ret heterozygous mice.
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Affiliation(s)
- R B Anderson
- Department of Anatomy & Cell Biology, University of Melbourne, 3010, Melbourne, Victoria, Australia.
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Holt DE, Cole SG, Anderson RB, Miscelis RR, Bridges CR. The Canine Right Caudal and Accessory Lobe Pulmonary Veins: Revised Anatomical Description, Clinical Relevance, and Embryological Implications. Anat Histol Embryol 2005; 34:273-5. [PMID: 15996130 DOI: 10.1111/j.1439-0264.2005.00610.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [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: 11/30/2022]
Abstract
Necropsy dissections were performed on nine dogs to provide an anatomical description of the right caudal and accessory lobe pulmonary veins. In all dogs, the pulmonary vein from the right caudal lung lobe initially paralleled the right caudal lung lobe bronchus, running cranially, medially, and ventrally. It diverged from the bronchus at the level of the pulmonary artery and bronchus of the accessory lung lobe. At this point, the pulmonary vein from the right caudal lung lobe coursed dorsal to the pulmonary artery and bronchus of the accessory lung lobe. Medial to the bronchus of the accessory lung lobe, it received the pulmonary vein from the accessory lung lobe on its ventral surface. Within the pericardium, this common venous trunk merged with the caudal aspect of the left atrium either with or immediately adjacent to the left caudal lobe pulmonary vein. These findings were corroborated during surgical dissection to achieve isolation of the heart in five dogs as part of an experimental study on intravascular gene delivery to the heart. These anatomical findings are relevant to clinical and experimental surgery and raise interesting questions about the embryological development of pulmonary veins in the dog.
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Affiliation(s)
- D E Holt
- Department of Clinical Studies, University of Pennsylvania School of Veterinary Medicine, 3900 Delancey St, Philadelphia, PA 19104-6010, USA.
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Anderson RB, Enomoto H, Bornstein JC, Young HM. The enteric nervous system is not essential for the propulsion of gut contents in fetal mice. Gut 2004; 53:1546-7. [PMID: 15361513 PMCID: PMC1774256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
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Young HM, Anderson RB, Anderson CR. Guidance cues involved in the development of the peripheral autonomic nervous system. Auton Neurosci 2004; 112:1-14. [PMID: 15233925 DOI: 10.1016/j.autneu.2004.02.008] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2003] [Revised: 02/25/2004] [Accepted: 02/26/2004] [Indexed: 10/26/2022]
Abstract
All peripheral autonomic neurons arise from neural crest cells that migrate away from the neural tube and navigate to the location where ganglia will form. After differentiating into neurons, their axons then navigate to a variety of targets. During the development of the enteric nervous system, GDNF appears to play a role in inducing vagal neural crest cells to enter the gut, in retaining neural crest cells within the gut and in promoting the migration of neural crest cells along the gut. Sema3A regulates the entry of extrinsic axons into the distal hindgut, netrin-DCC signaling is responsible for the centripetal migration of cells to form the submucosal ganglia within the gut, Slit-Robo signaling prevents trunk level neural crest cells from entering the gut, and neurturin plays a role in the innervation of the circular muscle layer. During the development of the sympathetic nervous system, the migration of trunk neural crest cells through the somites is influenced by ephrin-Bs, Sema3A and F-spondin. The migration of neural crest cells ventrally beyond the somites requires neuregulin signaling and the clumping of cells into columns adjacent to the dorsal aorta is regulated by Sema3A. The rostral migration of cells to form the superior cervical ganglion (SCG) and the extension of axons along blood vessels involves artemin signaling through Ret and GFRalpha3, and the entry of sympathetic axons into target tissues involves neurotrophins and GDNF. Relatively little is known about the development of parasympathetic ganglia, but GDNF appears to play a role in the migration of some cranial ganglion precursors to their correct location, and both GDNF and neurturin are involved in the growth of parasympathetic axons into particular targets.
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Affiliation(s)
- H M Young
- Department of Anatomy and Cell Biology, University of Melbourne, 3010 VIC, Australia
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Young HM, Bergner AJ, Anderson RB, Enomoto H, Milbrandt J, Newgreen DF, Whitington PM. Dynamics of neural crest-derived cell migration in the embryonic mouse gut. Dev Biol 2004; 270:455-73. [PMID: 15183726 DOI: 10.1016/j.ydbio.2004.03.015] [Citation(s) in RCA: 211] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2004] [Revised: 03/03/2004] [Accepted: 03/05/2004] [Indexed: 01/26/2023]
Abstract
Neural crest-derived cells that form the enteric nervous system undergo an extensive migration from the caudal hindbrain to colonize the entire gastrointestinal tract. Mice in which the expression of GFP is under the control of the Ret promoter were used to visualize neural crest-derived cell migration in the embryonic mouse gut in organ culture. Time-lapse imaging revealed that GFP(+) crest-derived cells formed chains that displayed complicated patterns of migration, with sudden and frequent changes in migratory speed and trajectories. Some of the leading cells and their processes formed a scaffold along which later cells migrated. To examine the effect of population size on migratory behavior, a small number of the most caudal GFP(+) cells were isolated from the remainder of the population. The isolated cells migrated slower than cells in large control populations, suggesting that migratory behavior is influenced by cell number and cell-cell contact. Previous studies have shown that neurons differentiate among the migrating cell population, but it is unclear whether they migrate. The phenotype of migrating cells was examined. Migrating cells expressed the neural crest cell marker, Sox10, but not neuronal markers, indicating that the majority of migratory cells observed did not have a neuronal phenotype.
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Affiliation(s)
- H M Young
- Department of Anatomy and Cell Biology, University of Melbourne, 3010 Parkville, Victoria, Australia.
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Abstract
We report on the largest case to date of children with significant injuries from a single lightning strike. A retrospective analysis was done of the camping scene and injuries to 28 people (26 preadolescent girls and 2 adult supervisors) and 7 dogs from a documented lightning strike. Of the 35 victims sleeping in the tent, 4 girls and 4 dogs were fatally injured. The 2 adults were unharmed, but 23 of the children suffered injuries including burns (23), cataracts (8), macular holes (4), tympanic membrane rupture (2), and skull fracture (2). Many of these injuries occurred more frequently than would be expected from prior large reviews and reports.
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Affiliation(s)
- A E Carte
- South African Society for Atmospheric Sciences, Pretoria, South Africa
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Abstract
Recent work has shown that the power function, a ubiquitous characteristic of learning, memory, and sensation, can emerge from the arithmetic averaging of exponential curves. In the present study, the forgetting process was simulated via computer to determine whether power curves can result from the averaging of other types of component curves. Each of several simulations contained 100 memory traces that were made to decay at different rates. The resulting component curves were then arithmetically averaged to produce an aggregate curve for each simulation. The simulations varied with respect to the forms of the component curves: exponential, range-limited linear, range-limited logarithmic, or power. The goodness of the aggregate curve's fit to a power function relative to other functions increased as the amount of intercomponent slope variability increased, irrespective of component-curve type. Thus, the power law's ubiquity may reflect the pervasiveness of slope variability across component functions. Moreover, power-curve emergence may constitute a methodological artifact, an explanatory construct, or both, depending on the locus of the effect.
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Affiliation(s)
- R B Anderson
- Department of Psychology, Bowling Green State University, Ohio 43403, USA.
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Abstract
Midfoot and hindfoot arthrodeses traditionally have been done to treat deformities resulting from paralytic disorders, residual clubfoot deformity, and posttraumatic arthritis. The surgical indications for midfoot and hindfoot arthrodeses more recently have been expanded to include painful arthritic deformities associated with neuroarthropathy, seropositive or seronegative arthropathies, and neurologic disorders. Regardless of the joint fused or the technique used, the goal of each remains similar: the creation of a painless, plantigrade foot capable of being fitted into, at the very least, a custom shoe. The aim of the current study is to describe the major complications associated with midfoot and hindfoot fusions in adults, and the prevention and the treatment of these complications.
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Affiliation(s)
- C Bibbo
- Department of Orthopaedic Surgery, Marshfield Clinic, WI 54449-5777, USA
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Anderson RB. Respect the friendly adversary. J Am Osteopath Assoc 2001; 101:492-3. [PMID: 11575032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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Watson TS, Anderson RB, Davis WH. Periarticular injuries to the hallux metatarsophalangeal joint in athletes. Foot Ankle Clin 2000; 5:687-713. [PMID: 11232404] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The magnitude of hallux MTP injuries can range from a mild sprain to a frank dislocation. The importance of coaches, trainers, and physicians recognizing the severity of a turf toe injury cannot be overstated. The late sequelae of hyperextension injuries can lead to retirement from professional athletics. With appropriate conservative treatment, most individuals can return to play, although many have some residual pain. Future study in this area should define the indications for acute repair versus late treatment following a period of conservative modalities. Hyper-plantarflexion injuries also can be debilitating injuries, but most respond to rest, taping, anti-inflammatories, ice, and strengthening exercises. Lastly, dislocations of the hallux MTP joint can be diagnosed and treated after physical examination and appropriate radiographs are obtained. All closed dislocations should undergo an attempt at reduction in the emergency department after adequate anesthesia is administered. The patient should be advised, especially in type I injuries, of the need for possible acute operative intervention.
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Affiliation(s)
- T S Watson
- Desert Orthopaedic Center, Las Vegas, Nevada, USA.
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Abstract
Although the general principles of axon guidance in vitro are understood, little is known about how axons respond to the myriad of cues in vivo and navigate axon pathways within the complex milieu of the embryonic brain. Although neuropilin-1 is an axon guidance receptor for chemorepulsive ligands in the class 3 subfamily of semaphorins, its role in directing axon growth in vivo is unknown. In the present study, we have examined the expression and role of neuropilin-1 in the embryonic forebrain of Xenopus. Neuropilin-1 was selectively expressed by a subset of axons in the early scaffold of axon tracts. These axons arise from the presumptive telencephalic nucleus, cross the rostral midline by means of the postoptic commissure, and enter the major longitudinal tract of the prosencephalon, the tract of the postoptic commissure. At the level of the mesencephalon, these axons diverge and enter one of two axon tracts: either the ventral longitudinal tract or the ventral commissure. This same population of axons also expresses NOC-2, a novel glycoform of the neural cell adhesion molecule N-CAM. We have previously revealed the presence of a chemorepulsive activity underlying the pathway followed by these axons as they cross the ventral commissure. When neuropilin-1 was overexpressed after blastomere injections of synthetic RNA transcripts, NOC-2 axons entered the ventral commissure but failed to cross the midline. Instead, these axons were inhibited from growing ventrally within the commissural pathway. These results suggest that the level of neuropilin-1 in the NOC-2 subpopulation of axons is critical for determining whether these axons reach the ventral midline. Thus, neuropilin-1 may a specific role in directing the growth of NOC-2 axons across the ventral midline in the early embryonic mesencephalon.
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Affiliation(s)
- R B Anderson
- Division of Biological Science, Nagoya University Graduate School of Science, Nagoya, Japan
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Watson AD, Anderson RB, Davis WH. Comparison of results of retrocalcaneal decompression for retrocalcaneal bursitis and insertional achilles tendinosis with calcific spur. Foot Ankle Int 2000; 21:638-42. [PMID: 10966360 DOI: 10.1177/107110070002100802] [Citation(s) in RCA: 118] [Impact Index Per Article: 4.9] [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: 02/01/2023]
Abstract
Sixteen feet with retrocalcaneal bursitis (RB) and twenty-two feet with calcific Achilles insertional tendinosis (IAT-CS) underwent retrocalcaneal decompression after failure of nonoperative treatment. Follow-up evaluation at least two years after surgery included AOFAS Ankle-Hindfoot subscale scores, satisfaction, time until maximum symptomatic improvement, and radiographs. Statistically significant differences between the groups include the following: IAT-CS patients were older, required nearly twice the time to reach maximum symptomatic improvement, had lower satisfaction rates, had a lower pain score, and more frequently had shoewear restrictions. Radiographic recurrence did not correlate with outcome or symptomatic recurrence.
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Affiliation(s)
- A D Watson
- Department of Orthopaedic Surgery, Allegheny General Hospital, Pittsburgh, PA 15212, USA.
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Anderson RB, Cooper HM, Jackson SC, Seaman C, Key B. DCC plays a role in navigation of forebrain axons across the ventral midbrain commissure in embryonic xenopus. Dev Biol 2000; 217:244-53. [PMID: 10625550 DOI: 10.1006/dbio.1999.9549] [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] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In the developing vertebrate brain, growing axons establish a scaffold of axon tracts connected across the midline via commissures. We have previously identified a population of telencephalic neurons that express NOC-2, a novel glycoform of the neural cell adhesion molecule N-CAM that is involved in axon guidance in the forebrain. These axons arise from the presumptive telencephalic nucleus, course caudally along the principal longitudinal tract of the forebrain, cross the ventral midline in the midbrain, and then project to the contralateral side of the brain. In the present study we have investigated mechanisms controlling the growth of these axons across the ventral midline of the midbrain. The axon guidance receptor DCC is expressed by the NOC-2 population of axons both within the longitudinal tract and within the ventral midbrain commissure. Disruption of DCC-dependent interactions, both in vitro and in vivo, inhibited the NOC-2 axons from crossing the ventral midbrain. Instead, these axons grew along aberrant trajectories away from the midline, suggesting that DCC-dependent interactions are important for overcoming inhibitory mechanisms within the midbrain of the embryonic vertebrate brain. Thus, coordinated responsiveness of forebrain axons to both chemostimulatory and chemorepulsive cues appears to determine whether they cross the ventral midline in the midbrain.
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Affiliation(s)
- R B Anderson
- Department of Anatomy & Cell Biology, University of Melbourne, Parkville, 3052, Australia
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Abstract
In the developing vertebrate brain, acetylcholinesterase (AChE) expression coincides temporally with axon tract formation. Although AChE promotes neurite outgrowth in vitro, the role of this molecule in the development of axon tracts in vivo is unknown. To address this question, we examined the effects of the AChE inhibitor, BW284C51, on the formation of the early scaffold of axon tracts in the embryonic Xenopus brain. In exposed Xenopus brain preparations, axons elongate and establish a normal topography of axon tracts. However, when brains were exposed to BW284C51, the thickness of the major longitudinal axon tract, the tract of the post-optic commissure decreased in a dose-dependent manner. When BW284C51 was removed from the culture media axon tract development returned to normal within 5 h. These findings provide the first evidence for a non-classical role of AChE in the initial formation of axon tracts within the developing vertebrate brain.
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Affiliation(s)
- R B Anderson
- Department of Anatomy and Cell Biology, University of Melbourne, Parkville, Australia
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Trepman E, Lutter LD, Anderson RB. Highlights of the Fifteenth Annual Summer Meeting of the American Orthopaedic Foot and Ankle Society, Fajardo, Puerto Rico, July 9-11, 1999. Foot Ankle Int 1999; 20:826-37. [PMID: 10609714 DOI: 10.1177/107110079902001213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Abstract
1. The aim of the present study is to define the trajectory of growing axons as well as to characterize guidance cues mediating neuronal pathfinding in the rostral brain of embryonic Xenopus. 2. The early embryonic Xenopus brain consists of a stereotypical pattern of axon tracts arranged about orthogonal axes. This scaffold of axons is constructed around the tracts of the postoptic commissure (TPOC), a pair of longitudinal tracts that course along the ventrolateral surface of the brain. These tracts are connected across the midline by two commissures. Three short tracts join the dorsal brain to the TPOC. 3. The TPOC consists of chemically distinct subpopulations of axons defined by the expression of NOC, novel glycoforms of the neural cell adhesion molecule N-CAM. Axons expressing NOC-2 sort out in the ventral portion of the TPOC. NOC-2+ axons in the supraoptic tract appear to fasciculate with axons expressing the same cell adhesion molecule in the ventral TPOC. 4. Chondroitin sulphates modulate the growth of axons from the TPOC into the ventral tegmental commissural pathway in the rostral midbrain. 5. Unique guidance cues are responsible for neuronal pathfinding at specific points in the trajectory of growing axons in the rostral brain. We have shown that selective fasciculation mediates the turning of axons into the major longitudinal tract, while specific cues are required for axons to exit this pathway.
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Affiliation(s)
- B Key
- Department of Anatomical Sciences, University of Queensland, Brisbane, Australia.
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Abstract
A scaffold of axons consisting of a pair of longitudinal tracts and several commissures is established during early development of the vertebrate brain. We report here that NOC-2, a cell surface carbohydrate, is selectively expressed by a subpopulation of growing axons in this scaffold in Xenopus. NOC-2 is present on two glycoproteins, one of which is a novel glycoform of the neural cell adhesion molecule N-CAM. When the function of NOC-2 was perturbed using either soluble carbohydrates or anti-NOC-2 antibodies, axons expressing NOC-2 exhibited aberrant growth at specific points in their pathway. NOC-2 is the first-identified axon guidance molecule essential for development of the axon scaffold in the embryonic vertebrate brain.
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Affiliation(s)
- R B Anderson
- Neurodevelopment Laboratory, Department of Anatomy and Cell Biology, University of Melbourne, Parkville 3052, Australia
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Anderson RB, Hollenberg NK, Williams GH. Physical Symptoms Distress Index: a sensitive tool to evaluate the impact of pharmacological agents on quality of life. Arch Intern Med 1999; 159:693-700. [PMID: 10218748 DOI: 10.1001/archinte.159.7.693] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
OBJECTIVES To examine whether the degree of stress associated with adverse physical side effects correlates with overall quality of life (QOL) and compliance rates. To determine if instruments used to assess QOL can detect differences between treatments that have no known central nervous system effects. PATIENTS AND METHODS This randomized, double-blind, parallel group study evaluated 180 to 480 mg of controlled onset, extended release (COER)-verapamil (n = 259) or 30 to 120 mg/d of nifedipine gastrointestinal therapeutic system (GITS) (n = 269) in men and women between 21 and 80 years of age with stages 1 to 3 hypertension. A battery of questions evaluating psychological well-being and a physical symptom distress index was administered after a 4-week placebo washout (baseline) and after 10 weeks of treatment or at dropout. RESULTS Both treatments effectively lowered blood pressure, and there were no significant between-group differences in psychosocial QOL. A difference in the level of physical symptom distress was detected between treatments (P = .002; multivariate analysis of variance), with 7 significant univariate treatment effects, all favoring COER-verapamil, being noted-pedal edema, polyuria, rapid heart beat or palpitations, hives, muscle cramps, abdominal cramps, and headaches. Constipation-related distress increased significantly (P = .001) but to a similar extent with both treatments. The difference in symptom distress tended to predict compliance as there were more withdrawals in the nifedipine GITS group (n = 85) vs COER-verapamil group (n = 64) (P = .08). CONCLUSIONS Patient-assessed physical symptom distress is a sensitive, simple technique to evaluate the effect of antihypertensive medications on QOL and tolerability, as shown by its ability to detect the improvement associated with COER-verapamil. Depending on the agents involved, the Physical Symptom Distress Index may more closely predict dropout rates than the traditional psychosocial instruments, as suggested by the lower dropout rate in the COER-verapamil group. Thus, in studying treatment effects on QOL, both the distress of physical symptoms and the impact of psychosocial factors should be evaluated.
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Abstract
The modified Brostrom procedure has become the standard for anatomic repair of symptomatic chronic lateral instability. However, it was our perception that this local tissue repair may fail eventually, particularly in patients that are overweight, hyperflexible, or are involved in strenuous work or athletic activity. This is a retrospective review of 21 lateral ankle reconstructions (20 patients) in which the modified Brostrom technique was augmented with a portion of the peroneus brevis tendon. All patients were interviewed at an average of 29.5 months (range, 14-56 months postsurgery). Fourteen patients also agreed to be evaluated by a physical therapist. No surgical complications were identified. American Orthopaedic Foot and Ankle Society ankle-hindfoot scores averaged 98.2. There was no significant difference in passive or active range of motion of plantarflexion or dorsiflexion when compared to the contralateral ankle. However, a statistically significant loss of inversion (passive, P = 0.011; active, P = 0.018) and eversion (passive, P = 0.004; active, P = 0.007) was noted when compared to the contralateral ankle. Measurement of isometric eversion strength, using a Cybex 340 Isokinetic device, and functional testing, using a lateral lunge test, revealed no significant loss of peroneal strength. The authors conclude that chronic lateral ankle instability in the general population can be successfully managed with a modified Brostrom procedure augmented with a portion of the peroneus brevis. The procedure remains technically simple and provides a greater static restraint for inversion stress without evidence of dramatic overtightening or loss of peroneal strength.
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Affiliation(s)
- P Girard
- Carolinas Medical Center, Charlotte, North Carolina, USA
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Abstract
Dorsal cheilectomy of the hallux metatarsophalangeal (MTP) joint through a medial approach can effectively provide long-term relief of pain and improve function in symptomatic mild-to-moderate hallux rigidus, despite progression of generalized first MTP joint arthritic degeneration and/or loss of motion. Fifty-seven patients (75 feet) with arthritis of the first MTP joint underwent dorsal cheilectomy through a medial approach for hallux rigidus failing nonoperative management. Excision of the dorsal articular surface of the first metatarsal head and dorsal osteophytes was performed through a medial approach that also allowed for plantar capsular release and removal of lateral osteophytes. Minimum follow-up was 3 years (average, 63 months; range, 37-92 months). Fifty-two patients (68 feet) returned for clinical and radiographic evaluation. American Orthopaedic Foot and Ankle Society Hallux Rating scores improved from a preoperative average of 45 to 85 points at follow-up. Average dorsiflexion improved from 19 degrees to 39 degrees, and the average range of motion improved from 34 degrees to 64 degrees. Preoperative radiographic grade of arthritic degeneration was grade I in 17 feet, grade II in 39 feet, and grade III in 12 feet; at follow-up, the radiographic grade was grade I in 2 feet, grade II in 26 feet, and grade III in 40 feet. Thirty-two feet worsened one grade, 6 feet worsened two grades, and 28 feet demonstrated no change (12 of 28 were grade III, preoperatively). A dorsal spur recurred in 21 feet, 9 of which were symptomatic. Complications included two superficial wound infections and four transient paresthesias of the hallux, all of which resolved uneventfully.
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Affiliation(s)
- M E Easley
- Carolinas Medical Center, Charlotte, North Carolina, USA
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Abstract
Twenty diabetic patients underwent 22 dorsiflexion metatarsal osteotomies for treatment of chronic persistent or recurrent neuropathic forefoot ulcers. Mean duration of nonoperative treatment was 13 months. The procedure consisted of irrigation and debridement of the ulcer followed by basilar closing wedge metatarsal osteotomy performed through a dorsal approach. At follow-up, complete ulcer healing was noted in 21 cases (95%) at an average of 40 days postoperatively. Complications occurred in 15 cases (68%). The main problems encountered postoperatively were acute Charcot disease (32%) and deep wound infections (14%). Transfer lesions under adjacent metatarsal heads developed in two cases (9%). One ulcer (5%) failed to heal secondary to vascular insufficiency and eventually required a below the knee amputation after a failed revascularization attempt. Loss of screw fixation occurred in one patient (5%) but acceptable metatarsal alignment was maintained and the ulcer healed uneventfully. There were no cases of ulcer recurrence. The results of this study suggest that dorsiflexion metatarsal osteotomy is a reliable salvage procedure for the treatment of recalcitrant neuropathic forefoot ulcers that have failed an adequate trial of nonoperative treatment. This procedure is associated with a high complication rate, as would be expected in this patient population.
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Affiliation(s)
- J E Fleischli
- Carolinas Medical Center, Charlotte, North Carolina, USA
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Abstract
A retrospective review was performed on all patients who had an in situ subtalar arthrodesis for painful sequelae of calcaneus fractures between 1989 and 1994. Nineteen feet were available for evaluation, with a mean follow-up of 27 months (range, 12-62 months). Lateral calcaneal wall decompression was performed in seven feet. Although loss of ankle dorsiflexion was associated with anterior ankle tenderness, loss of ankle dorsiflexion was not correlated with either talar declination angles or talar height differences. There was no correlation between American Orthopaedic Foot and Ankle Society hindfoot score and talar declination, talar height, or calcaneal width. Peroneal tendon/subfibular impingement, ankle tenderness, sural nerve injury, and patient smoking were all statistically associated with lower scores. The calcaneocuboid joint was frequently involved in the fracture but was not painful at follow-up. Late pain after a calcaneal fracture is not caused by only subtalar arthrosis. Radiographic criteria alone cannot be relied upon for surgical decision making. Careful physical evaluation should be used to determine sources of pain. Distraction arthrodesis should be considered only if findings of anterior ankle impingement are present. If sural nerve symptoms are present, a sural neurectomy may be added to the procedure. Pain localized to the plantar fat pad should be managed nonoperatively. Radiographic changes in the calcaneocuboid joint rarely require surgical intervention. Based on these results, in situ subtalar arthrodesis with lateral wall decompression is the procedure of choice in most cases of subtalar traumatic arthritis with lateral wall impingement.
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Abstract
Chondroitin sulfate proteoglycans display both inhibitory and stimulatory effects on cell adhesion and neurite outgrowth in vitro. The functional activity of these proteoglycans appears to be context specific and dependent on the presence of different chondroitin sulfate-binding molecules. Little is known about the role of chondroitin sulfate proteoglycans in the growth and guidance of axons in vivo. To address this question, we examined the effects of exogenous soluble chondroitin sulfates on the growth and guidance of axons arising from a subpopulation of neurons in the vertebrate brain which express NOC-2, a novel glycoform of the neural cell adhesion molecule N-CAM. Intact brains of stage 28 Xenopus embryos were unilaterally exposed to medium containing soluble exogenous chondroitin sulfates. When exposed to chondroitin sulfate, NOC-2(+) axons within the tract of the postoptic commissure failed to follow their normal trajectory across the ventral midline via the ventral commissure in the midbrain. Instead, these axons either stalled or grew into the dorsal midbrain or continued growing longitudinally within the ventral longitudinal tract. These findings suggest that chondroitin sulfate proteoglycans indirectly modulate the growth and guidance of a subpopulation of forebrain axons by regulating either matrix-bound or cell surface cues at specific choice points within the developing vertebrate brain.
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Affiliation(s)
- R B Anderson
- Department of Anatomy and Cell Biology, University of Melbourne, Parkville, 3052, Australia
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Abstract
Recent memory theory has emphasized the concept of need probability--that is, the probability that a given piece of learned information will be tested at some point in the future. It has been proposed that, in real-world situations, need probability declines over time and that the memory-loss rate is calibrated to match the progressive reduction in need probability (J.R. Anderson & Schooler, 1991). The present experiments were designed to examine the influence of the slope of the need-probability curve on the slope of the retention curve. On each of several trials, subjects memorized a list of digits, then retained the digits in memory for 1, 2, 4, 8, or 16 sec. Some trials ended with a recall test; other trials ended with the message, "no test." In Experiment 1, the likelihood of encountering a memory test (i.e., the need probability) was made to either increase or decrease as the retention interval increased; in Experiment 2, need probability either was flat (invariant across retention intervals) or decreased as the retention interval increased. The results indicated that the shape of the need-probability curve influenced the slope of the retention curve (Experiment 1) and that the effect became larger as the experimental session progressed (Experiment 2). The findings support the notion that memory adapts to need probabilities and that the rate of forgetting is influenced by the slope of the need-probability curve. In addition, all of the forgetting curves approximated a power function, suggesting that need probability influences the slope but not the form of forgetting.
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Affiliation(s)
- R B Anderson
- Department of Psychology, Bowling Green State University, OH 43403, USA.
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Anderson RB, Garavan H, Rivardo MG, Chadwick R. Inhibitory consequences of memory selection. Acta Psychol (Amst) 1997; 96:155-66. [PMID: 9434587 DOI: 10.1016/s0001-6918(97)00013-9] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
When subjects select a prime from a visual display while leaving a distractor prime unselected, response time (RT) or response accuracy to a subsequent probe may be impeded if the distractor prime and probe are identical, or if they are related to one another. This phenomenon, negative priming (NP), has obvious implications for understanding perceptual selection. However, it is not known whether NP results from other kinds of selection processes. The present studies were designed to investigate whether NP occurs when primes are selected from working memory rather than from a visual display. In the two experiments, the subjects memorized two primes, selected one prime for further processing, and classified the contents of a probe display. Significant NP occurred in both Experiments. In Experiment 2, however, NP occurred only under easy-selection conditions; the effect was reversed under difficult-selection conditions. The findings indicate a role for NP in memory processing, but contrast with the results from perceptual selection studies showing greater NP under difficult-selection than under easy-selection conditions. The present finding suggests a complex and perhaps strategy-dependent relationship between memory selection difficulty and NP.
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Affiliation(s)
- R B Anderson
- Department of Psychology, Bowling Green State University, OH 43403, USA.
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Abstract
Recent studies of the mathematical relationship between time and forgetting suggest that it is a power function rather than an exponential function, a finding that has important theoretical consequences. Through computational analysis and reanalyses of published data, we demonstrate that arithmetic averaging of exponential curves can produce an artifactual power curve, particularly when there are large and systematic differences among the slopes of the component curves. A series of simulations showed that the amount of power artifact is small when the slopes of the component curves are normally or rectangularly distributed and when the performance measure is noise free. However, the simulations also showed that the artifact can be quite large, depending on the shape of the noise distribution and restrictions in the performance range. We conclude that claims concerning the form of memory functions should consider whether the data are likely to contain artifact caused by averaging or by the presence of range-restricted noise.
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Affiliation(s)
- R B Anderson
- Department of Psychology, Bowling Green State University, OH 43403, USA.
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Affiliation(s)
- R B Anderson
- Miller Orthopaedic Clinic, Charlotte, North Carolina 28203, USA
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Abstract
We first performed autogenous bone grafting for lesions of the hallux sesamoid in 1984. During the next 9 years, 21 patients (11 men and 10 women with an average age of 34 and 32 years, respectively) underwent this surgical procedure for symptomatic tibial hallux sesamoid non-unions. Successful bony union was achieved in all but two patients. The majority of patients obtained concomitant relief of preoperative symptomatology and returned to their preinjury level of activity. We believe that this procedure serves as an alternative to hallux sesamoid excision in selected cases.
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Affiliation(s)
- R B Anderson
- Miller Orthopaedic Clinic, Carolinas Medical Center, Charlotte, North Carolina 28203, USA
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Affiliation(s)
- W H Davis
- Miller Orthopaedic Clinic, Charlotte, NC 28203, USA
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Abstract
The aim of the present study was to characterise the expression pattern of a novel N-CAM glycoform, called NOC-1, within axon tracts of the developing Xenopus brain. Double-label immunostaining of wholemount embryonic brains revealed that only a subpopulation of axons express NOC-1. Axons in the supra-optic tract (SOT) express NOC-1 and course ventrally from the presumptive telencephalon to join the tract of the post-optic commissure (TPOC), the principal longitudinal tract of the forebrain. NOC-1 was also expressed by axons that form discrete fascicles in the ventral portion of the TPOC. Growth cones in the SOT appeared to only turn caudally upon contacting the NOC-1 expressing axons in the ventral region of the TPOC. Thus, all NOC-1 expressing axons within the TPOC follow a common ventral pathway. These observations demonstrate that there is selective partitioning of axons which express a novel N-CAM glycoform within the developing Xenopus forebrain. Moreover, these results indicate that the SOT-TPOC junction is an important choice point for ventrally growing SOT axons and that selective interactions occur between subpopulations of axons expressing NOC-1 in the SOT and TPOC.
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Affiliation(s)
- R B Anderson
- Department of Anatomy and Cell Biology, University of Melbourne, Parkville, Australia
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