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Jaumann R, Schmitz N, Ho TM, Schröder SE, Otto KA, Stephan K, Elgner S, Krohn K, Preusker F, Scholten F, Biele J, Ulamec S, Krause C, Sugita S, Matz KD, Roatsch T, Parekh R, Mottola S, Grott M, Michel P, Trauthan F, Koncz A, Michaelis H, Lange C, Grundmann JT, Maibaum M, Sasaki K, Wolff F, Reill J, Moussi-Soffys A, Lorda L, Neumann W, Vincent JB, Wagner R, Bibring JP, Kameda S, Yano H, Watanabe S, Yoshikawa M, Tsuda Y, Okada T, Yoshimitsu T, Mimasu Y, Saiki T, Yabuta H, Rauer H, Honda R, Morota T, Yokota Y, Kouyama T. Images from the surface of asteroid Ryugu show rocks similar to carbonaceous chondrite meteorites. Science 2020; 365:817-820. [PMID: 31439797 DOI: 10.1126/science.aaw8627] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 07/23/2019] [Indexed: 11/02/2022]
Abstract
The near-Earth asteroid (162173) Ryugu is a 900-m-diameter dark object expected to contain primordial material from the solar nebula. The Mobile Asteroid Surface Scout (MASCOT) landed on Ryugu's surface on 3 October 2018. We present images from the MASCOT camera (MASCam) taken during the descent and while on the surface. The surface is covered by decimeter- to meter-sized rocks, with no deposits of fine-grained material. Rocks appear either bright, with smooth faces and sharp edges, or dark, with a cauliflower-like, crumbly surface. Close-up images of a rock of the latter type reveal a dark matrix with small, bright, spectrally different inclusions, implying that it did not experience extensive aqueous alteration. The inclusions appear similar to those in carbonaceous chondrite meteorites.
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Affiliation(s)
- R Jaumann
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany. .,Free University of Berlin, Institute of Geosciences, Berlin, Germany
| | - N Schmitz
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - T-M Ho
- DLR, Institute of Space Systems, Bremen, Germany
| | - S E Schröder
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - K A Otto
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - K Stephan
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - S Elgner
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - K Krohn
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - F Preusker
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - F Scholten
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - J Biele
- DLR, Microgravity User Support Center, Linder Höhe, Cologne, Germany
| | - S Ulamec
- DLR, Microgravity User Support Center, Linder Höhe, Cologne, Germany
| | - C Krause
- DLR, Microgravity User Support Center, Linder Höhe, Cologne, Germany
| | - S Sugita
- Department of Earth and Planetary Science, School of Science, University of Tokyo, Tokyo 113-0033, Japan
| | - K-D Matz
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - T Roatsch
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - R Parekh
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany.,Free University of Berlin, Institute of Geosciences, Berlin, Germany
| | - S Mottola
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - M Grott
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - P Michel
- Université Côte d'Azur, Observatoire de la Côte d'Azur, Centre National de la Recherche Scientifique, Laboratoire Lagrange, Nice, France
| | - F Trauthan
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - A Koncz
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - H Michaelis
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - C Lange
- DLR, Institute of Space Systems, Bremen, Germany
| | | | - M Maibaum
- DLR, Microgravity User Support Center, Linder Höhe, Cologne, Germany
| | - K Sasaki
- DLR, Institute of Space Systems, Bremen, Germany
| | - F Wolff
- DLR, Institute of System Dynamics and Control, Oberpfaffenhofen, Germany
| | - J Reill
- DLR, Institute of Robotics and Mechatronics, Oberpfaffenhofen, Germany
| | - A Moussi-Soffys
- Centre National d'Études Spatiales, 18 Avenue E. Belin, Toulouse 31401, France
| | - L Lorda
- Centre National d'Études Spatiales, 18 Avenue E. Belin, Toulouse 31401, France
| | - W Neumann
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - J-B Vincent
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - R Wagner
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - J-P Bibring
- L'Université de Paris Sud-Orsay, Institut d'Astrophysique Spatiale, Orsay, France
| | - S Kameda
- Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
| | - H Yano
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
| | - S Watanabe
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan.,Department of Earth and Planetary Sciences, Nagoya University Furo-cho Chikusa-ku, Nagoya, Japan
| | - M Yoshikawa
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
| | - Y Tsuda
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
| | - T Okada
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
| | - T Yoshimitsu
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
| | - Y Mimasu
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
| | - T Saiki
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
| | - H Yabuta
- Department of Earth and Planetary Systems Science, Hiroshima University, Hiroshima, Japan
| | - H Rauer
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany.,Free University of Berlin, Institute of Geosciences, Berlin, Germany
| | - R Honda
- Kochi University, Department of Information Science, Akebono, Kochi, Japan
| | - T Morota
- University of Tokyo, Department of Earth and Planetary Science, Hongo, Bunkyo, Tokyo, Japan
| | - Y Yokota
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan
| | - T Kouyama
- National Institute of Advanced Industrial Science and Technology, Aomi, Koto, Tokyo, Japan
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Mottola S, Arnold G, Grothues HG, Jaumann R, Michaelis H, Neukum G, Bibring JP, Schröder SE, Hamm M, Otto KA, Pelivan I, Proffe G, Scholten F, Tirsch D, Kreslavsky M, Remetean E, Souvannavong F, Dolives B. COMETARY SCIENCE. The structure of the regolith on 67P/Churyumov-Gerasimenko from ROLIS descent imaging. Science 2015; 349:aab0232. [PMID: 26228151 DOI: 10.1126/science.aab0232] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The structure of the upper layer of a comet is a product of its surface activity. The Rosetta Lander Imaging System (ROLIS) on board Philae acquired close-range images of the Agilkia site during its descent onto comet 67P/Churyumov-Gerasimenko. These images reveal a photometrically uniform surface covered by regolith composed of debris and blocks ranging in size from centimeters to 5 meters. At the highest resolution of 1 centimeter per pixel, the surface appears granular, with no apparent deposits of unresolved sand-sized particles. The thickness of the regolith varies across the imaged field from 0 to 1 to 2 meters. The presence of aeolian-like features resembling wind tails hints at regolith mobilization and erosion processes. Modeling suggests that abrasion driven by airfall-induced particle "splashing" is responsible for the observed formations.
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Affiliation(s)
- S Mottola
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany.
| | - G Arnold
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - H-G Grothues
- DLR, Space Management, Space Science. Bonn, Germany
| | - R Jaumann
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany. Freie Universität Berlin, Institute of Geological Sciences, Berlin, Germany
| | - H Michaelis
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - G Neukum
- Freie Universität Berlin, Institute of Geological Sciences, Berlin, Germany
| | - J-P Bibring
- Institute of Space Astrophysics, Orsay, France
| | - S E Schröder
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - M Hamm
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany. Humboldt University Berlin, Germany
| | - K A Otto
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - I Pelivan
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - G Proffe
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - F Scholten
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - D Tirsch
- German Aerospace Center (DLR), Institute of Planetary Research, Berlin, Germany
| | - M Kreslavsky
- Earth and Planetary Sciences, University of California, Santa Cruz, CA, USA
| | - E Remetean
- Centre National d'Études Spatiales, Toulouse, France
| | | | - B Dolives
- Magellium, Ramonville Saint-Agne, France
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Olbrich HG, Michaelis H, Vandeplassche G, Borgers M, Oremek G, Krause E, Satter P, Kober G, Mutschler E, Kaltenbach M. Ultrastructural calcium distribution and myocardial calcium content in human idiopathic dilated cardiomyopathy. Cardiovasc Pathol 2015; 2:127-36. [PMID: 25990607 DOI: 10.1016/1054-8807(93)90024-v] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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] [Received: 09/15/1992] [Accepted: 12/31/1992] [Indexed: 02/07/2023] Open
Abstract
Myocardial calcium overload in chronic heart failure is still a debatable issue. The aim of this study was to investigate the myocardial calcium content and intracellular calcium distribution in end-stage dilated cardiomyopathy. The explanted hearts of 13 patients (9 male, 4 female, mean age 49 ± 12 years) undergoing heart transplantation because of end-stage dilated cardiomyopathy were examined. Samples were obtained from the right and left ventricular free wall and from the septum. Calcium and magnesium content were measured by atomic absorption spectrophotometry. Ultrastructural calcium distribution was examined in dilated cardiomyopathy using the phosphate-pyroantimonate method. Ultrastructural calcium distribution was also examined in left ventricular biopsies obtained from 3 patients (male, mean age 47 ± 3.6 years) with nonfailing hearts. The number of mitochondrial calcium precipitates was estimated morphometrically by a point counting method. Myocardial calcium and magnesium content in dilated cardiomyopathy did not differ significantly among the right and left ventricles and septum ranging from 8.5 to 10.8 mmol/kg dry weight. The phosphate-pyroantimonate method visualized calcium precipitates being confined to the sarcolemma, T-tubules, intercalated disks, and mitochondria in both nonfailing myocardium and dilated cardiomyopathy. Because mitochondria may act as buffers of cytoplasmic calcium, mitochondrial calcium precipitates served as a criterion for a possible cellular calcium overload. No differences in the amount of mitochondrial calcium deposits were observed between dilated cardiomyopathy and nonfailing hearts. The data suggest that there is no global myocardial calcium overload in human eng-stage dilated cardiomyopathy.
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Affiliation(s)
- H G Olbrich
- Zentrum der Inneren Medizin, Universität Frankfurt, Germany
| | - H Michaelis
- Zentrum der Inneren Medizin, Universität Frankfurt, Germany
| | | | - M Borgers
- Zentrum der Chirurgie, Universität Frankfurt, Germany
| | - G Oremek
- Zentrum der Inneren Medizin, Universität Frankfurt, Germany
| | - E Krause
- Janssen Research Foundation, Beerse, Belgium
| | - P Satter
- Janssen Research Foundation, Beerse, Belgium
| | - G Kober
- Zentrum der Inneren Medizin, Universität Frankfurt, Germany
| | - E Mutschler
- Pharmakologisches Institut für Naturwissenschaftler, Universität Frankfurt, Germany
| | - M Kaltenbach
- Zentrum der Inneren Medizin, Universität Frankfurt, Germany
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