Marion Nachon

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To 23 subjects with endogenous depression after a previous unsuccessful treatment with common antidepressive drugs (imipramine-like or MAO inhibitors) dl- or d-phenylalanine was given in dialy oral doses of 50 or 100 mg during 15 days. A complete euthymia was obtained in 17 subjects between one and 13 days of treatment. No important adverse reaction was(More)
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(More)
Stable isotope ratios of H, C, and O are powerful indicators of a wide variety of planetary geophysical processes, and for Mars they reveal the record of loss of its atmosphere and subsequent interactions with its surface such as carbonate formation. We report in situ measurements of the isotopic ratios of D/H and (18)O/(16)O in water and (13)C/(12)C,(More)
The Curiosity rover has analyzed abundant light-toned fracture-fill material within the Yellowknife Bay sedimentary deposits. The ChemCam instrument, coupled with Mastcam and ChemCam/Remote Micro Imager images, was able to demonstrate that these fracture fills consist of calcium sulfate veins, many of which appear to be hydrated at a level expected for(More)
The surface of Mars has long been considered a relatively oxidizing environment, an idea supported by the abundance of ferric iron phases observed there. However, compared to iron, manganese is sensitive only to high redox potential oxidants, and when concentrated in rocks, it provides a more specific redox indicator of aqueous environments. Observations(More)
Caribou with ChemCam analysis location in white box. This rock is highly fractured and appears to have a slightly mottled coloration (Mastcam-100 image 0342MR0013820010301085E01_DWXX.IMG). (b) ChemCam RMI colorized with Mastcam. The high Mn analysis is at location 5, marked with a white arrow along with the first and last shots of the 10x1 raster. Location(More)
The Yellowknife Bay formation represents a ~5m thick stratigraphic section of lithified fluvial and lacustrine sediments analyzed by the Curiosity rover in Gale crater, Mars. Previous works have mainly focused on the mudstones that were drilled by the rover at two locations. The present study focuses on the sedimentary rocks stratigraphically above the(More)
Voids and hollow spheroids between ∼1 and 23 cm in diameter occur at several locations along the traverse of the Curiosity rover in Gale crater, Mars. These hollow spherical features are significantly different from anything observed in previous landed missions. The voids appear in dark-toned, rough-textured outcrops, most notably at Point Lake (sols(More)
The study of planetary atmospheres such as the one of Mars offers valuable insights into the evolution and dynamics of atmospheres. The absence of oceans and a biosphere on Mars allows the development of simpler climate models compared to Earth’s complex general circulation models. Recent improvements of Martian global climate models combined with new data(More)
(, W.W. Fischer, R.C. Wiens, J. Grotzinger, A.M. Ollila, A. Cousin, R.B. Anderson, B.C. Clark, R. Gellert, N. Mangold, S. Maurice, S. Le Mouélic, M. Nachon, M. Schmidt, J. Berger, S. M. Clegg, O. Forni, C. Hardgrove, N. Melikechi, H.E. Newsom, V. Sautter. Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, U.S.A. California(More)