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1. An olivine cumulate outcrop on the floor of Jezero crater, Mars

Author

Liu, Y, Tice, MM, Schmidt, ME, Treiman, AH, Kizovski, TV, Hurowitz, JA, Allwood, AC, Henneke, J, Pedersen, DAK, VanBommel, SJ, Jones, MWM, Knight, AL, Orenstein, BJ, Clark, BC, Elam, WT, Heirwegh, CM, Barber, T, Beegle, LW, Benzerara, K, Bernard, S, Beyssac, O, Bosak, T, Brown, AJ, Cardarelli, EL, Catling, DC, Christian, Cloutis, EA, Cohen, BA, Davidoff, S, Fairén, AG, Farley, KA, Flannery, DT, Galvin, A, Grotzinger, JP, Gupta, S, Hall, J, Herd, CDK, Hickman-Lewis, K, Hodyss, RP, Horgan, BHN, Johnson, Jørgensen, JL, Kah, LC, Maki, JN, Mandon, L, Mangold, N, McCubbin, FM, McLennan, SM, Moore, K, Nachon, M, Nemere, P, Nothdurft, LD, Núñez, JI, O'Neil, L, Quantin-Nataf, CM, Sautter, V, Shuster, DL, Siebach, KL, Simon, JI, Sinclair, KP, Stack, KM, Steele, A, Tarnas, JD, Tosca, NJ, Uckert, K, Udry, A, Wade, LA, Weiss, BP, Wiens, RC, Williford, KH, Zorzano, M-P, Mangold, Nicolas, Cosmochimie [IMPMC] (IMPMC_COSMO), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Planétologie et Géosciences [UMR_C 6112] (LPG), Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST), Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Liu, Y [0000-0003-0308-0942], Tice, MM [0000-0003-2560-1702], Schmidt, ME [0000-0003-4793-7899], Treiman, AH [0000-0002-8073-2839], Kizovski, TV [0000-0001-8188-9769], Hurowitz, JA [0000-0002-5857-8652], Henneke, J [0000-0002-3195-7417], Pedersen, DAK [0000-0001-7182-8567], VanBommel, SJ [0000-0002-6565-0827], Jones, MWM [0000-0002-0720-8715], Knight, AL [0000-0001-6832-8190], Orenstein, BJ [0000-0002-6586-4227], Clark, BC [0000-0002-5546-8757], Beegle, LW [0000-0002-4944-4353], Benzerara, K [0000-0002-0553-0137], Bernard, S [0000-0001-5576-7020], Beyssac, O [0000-0001-8879-4762], Bosak, T [0000-0001-5179-5323], Brown, AJ [0000-0002-9352-6989], Cardarelli, EL [0000-0001-5451-2309], Catling, DC [0000-0001-5646-120X], Christian, JR [0000-0003-4646-2852], Cloutis, EA [0000-0001-7301-0929], Cohen, BA [0000-0001-5896-5903], Davidoff, S [0000-0002-4417-7268], Fairén, AG [0000-0002-2938-6010], Flannery, DT [0000-0001-8982-496X], Grotzinger, JP [0000-0001-9324-1257], Gupta, S [0000-0001-6415-1332], Hall, J [0000-0003-0884-3777], Herd, CDK [0000-0001-5210-4002], Hickman-Lewis, K [0000-0001-8014-233X], Hodyss, RP [0000-0002-6523-3660], Horgan, BHN [0000-0001-6314-9724], Johnson, JR [0000-0002-5586-4901], Jørgensen, JL [0000-0002-0343-239X], Kah, LC [0000-0001-7172-2033], Maki, JN [0000-0002-7887-0343], Mandon, L [0000-0002-9310-0742], Mangold, N [0000-0002-0022-0631], McCubbin, FM [0000-0002-2101-4431], McLennan, SM [0000-0003-4259-7178], Nachon, M [0000-0003-0417-7076], Nothdurft, LD [0000-0001-9646-9070], Núñez, JI [0000-0003-0930-6674], O'Neil, L [0000-0003-1555-8229], Quantin-Nataf, CM [0000-0002-8313-8595], Shuster, DL [0000-0003-2507-9977], Siebach, KL [0000-0002-6628-6297], Simon, JI [0000-0002-3969-8958], Sinclair, KP [0000-0001-6261-4591], Stack, KM [0000-0003-3444-6695], Steele, A [0000-0001-9643-2841], Tarnas, JD [0000-0002-6256-0826], Tosca, NJ [0000-0003-4415-4231], Uckert, K [0000-0002-0859-5526], Udry, A [0000-0002-0074-8110], Wade, LA [0000-0001-8254-8181], Weiss, BP [0000-0003-3113-3415], Wiens, RC [0000-0002-3409-7344], Zorzano, M-P [0000-0002-4492-9650], and Apollo - University of Cambridge Repository

Subjects
[SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology, Multidisciplinary, 5101 Astronomical Sciences, 37 Earth Sciences, 3705 Geology, 5109 Space Sciences, [SDU.STU.PL] Sciences of the Universe [physics]/Earth Sciences/Planetology, 51 Physical Sciences, 3703 Geochemistry
Abstract

International audience; The geological units on the floor of Jezero crater, Mars, are part of a wider regional stratigraphy of olivine-rich rocks, which extends well beyond the crater. We investigate the petrology of olivine and carbonate-bearing rocks of the Séítah formation in the floor of Jezero. Using multispectral images and x-ray fluorescence data, acquired by the Perseverance rover, we performed a petrographic analysis of the Bastide and Brac outcrops within this unit. We find that these outcrops are composed of igneous rock, moderately altered by aqueous fluid. The igneous rocks are mainly made of coarse-grained olivine, similar to some Martian meteorites. We interpret them as an olivine cumulate, formed by settling and enrichment of olivine through multi-stage cooling of a thick magma body.

Published
2022
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3. The effect of intra-articular methadone on postoperative pain following anterior cruciate ligament reconstruction.

Author

Stewart DJ, Lambert EW, Stack KM, Pellegrini J, Unger DV, Hood RJ, Stewart, David J, Lambert, Edward W, Stack, Kimberly M, Pellegrini, Joseph, Unger, Daniel V, and Hood, Raymond J

Abstract

Background: Intra-articular narcotics have proven efficacy for providing pain relief following knee arthroscopy. This effect is short-lived. Methadone, with its long serum half-life (thirty-five hours, compared with two hours for morphine) could provide improved and prolonged pain relief. The purpose of the present study was to examine the effects of an intra-articular injection of methadone on postoperative analgesia following arthroscopic anterior cruciate ligament reconstruction.Methods: Sixty-five skeletally mature patients undergoing primary anterior cruciate ligament reconstruction were randomly assigned to one of three groups, all of which received an intra-articular injection consisting of 9.5 mL of 0.5% bupivacaine with 1:200,000 epinephrine at the completion of the procedure. In addition, the remaining 0.5 mL of the syringe was filled with one of three substances. The study group (twenty-five patients) received 5 mg of methadone, the comparison group (twenty-one patients) received 5 mg of morphine, and the control group (nineteen patients) received 0.5 mL of saline solution. All supplemental pain medications were given on an as-needed basis, recorded, and converted to morphine equivalents. Specific variables that were measured included supplemental analgesia requirements during both the inpatient period and the outpatient period (from the time of discharge to the seventh postoperative day) and pain scores.Results: There was no significant difference in inpatient (p = 0.998) or outpatient (p = 0.887) supplemental analgesic requirements or pain scores between the methadone group (Group 1) and the control group (Group 3). The morphine group (Group 2) required significantly less inpatient (p = 0.014) and outpatient (p = 0.044) supplemental analgesia compared with the control group (Group 3). There were no complications.Conclusions: The present report represents the first known study of the use of intra-articular methadone and establishes that this analgesic is safe at a single dose of 5 mg. At this dose, however, methadone does not provide improved postoperative analgesia following arthroscopic anterior cruciate ligament reconstruction. In contrast, intra-articular morphine does appear to be effective for decreasing postoperative pain. [ABSTRACT FROM AUTHOR]

Published
2005

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