Results 71 to 80 of about 10,002 (189)

Biosignature hide and seek [PDF]

Nature Astronomy, 2018
A new model predicts locations on the surface of radiation-blasted Europa, the ocean moon of Jupiter, where biochemical signatures of life emergent from the subsurface ocean might survive long enough for detection on the moon's changing surface.
openaire   +2 more sources

Directly Imaging Rocky Planets from the Ground [PDF]

, 2019
Over the past three decades instruments on the ground and in space have discovered thousands of planets outside the solar system. These observations have given rise to an astonishingly detailed picture of the demographics of short-period planets, but are
Artigau, É., Bailey, V., Baranec, C., Beichman, C., Benneke, B., Birkby, J., Bose, S. N., Brandt, T., Chilcote, J., Chun, M., Close, L., Crossfield, I., Currie, T., Dekany, R., Delorme, J. R., Dong, C., Dong, R., Doyon, R., Dressing, C., Fitzgerald, M., Fortney, J., Frazin, R., Gaidos, E., Guyon, O., Hashimoto, J., Hillenbrand, L., Howard, A., Jensen-Clem, R., Jovanovic, N., Kawahara, H., Knutson, H., Konopacky, Q., Kotani, T., Liu, M., Lozi, J., Lu, J., Macintosh, B., Males, J., Marley, M., Marois, C., Mawet, D., Mazin, B., Meeker, S., Millar-Blanchaer, M., Mondal, S., Murakami, N., Murray-Clay, R., Narita, N., Pyo, T. S., Roberts, L., Ruane, G., Serabyn, G., Shields, A., Simard, L., Skemer, A., Stelter, D., Tamura, M., Troy, M., Vasisht, G., Wallace, J. K., Wang, J., Wang, J., Wright, S.   +62 more
core   +1 more source

Spatially and temporally progressive hypoperfusion in Alzheimer's disease revealed by normative modeling

Alzheimer's &Dementia, Volume 22, Issue 3, March 2026.
Abstract INTRODUCTION Cerebral perfusion is implicated in Alzheimer's disease (AD), but its development in AD and mild cognitive impairment (MCI) is not well characterized. METHODS We constructed a normative model using > 12,000 arterial spin labeling MRI scans and applied generalized additive models for location, scale, and shape (GAMLSS).
Xinglin Zeng, Yiran Li, Lin Hua, Ruoxi Lu, Lucas Lemos Franco, Peter Kochunov, Shuo Chen, John A. Detre, Ze Wang, for the Alzheimer's Disease Neuroimaging Initiative   +9 more
wiley   +1 more source

The Dietary Polyphenol Resveratrol in Intestinal Ischemia–Reperfusion Injury: From Multifaceted Protective Mechanisms to Clinical Translation Challenges

Food Science &Nutrition, Volume 14, Issue 3, March 2026.
Intestinal ischemia–reperfusion (I/R) injury is a life‐threatening condition with mortality approaching 50%, driven by oxidative stress, inflammatory cascades, ferroptosis, and intestinal barrier disruption that ultimately precipitates distant organ dysfunction.
Xue‐feng Zhang, Zhi Huang, Yuan Zeng, Yan Zhang, Ping Li, Fei‐xiang Wang, Liang Nie   +6 more
wiley   +1 more source

Nonphotosynthetic Pigments as Potential Biosignatures [PDF]

Astrobiology, 2015
21 pages, 12 figures, 5 tables.
Schwieterman, Edward W, Cockell, Charles S, Meadows, Victoria S   +2 more
openaire   +6 more sources

Valuing life detection missions

, 2018
Recent discoveries imply that Early Mars was habitable for life-as-we-know-it; that Enceladus might be habitable; and that many stars have Earth-sized exoplanets whose insolation favors surface liquid water. These exciting discoveries make it more likely
Gaidos, Eric, Kite, Edwin S., Onstott, Tullis C.   +2 more
core   +1 more source

Surface‐Driven Protocell Formation in Geologically Relevant Early Earth Environment

ChemSystemsChem, Volume 8, Issue 2, March 2026.
Illustration of a prebiotic early‐Earth environment showing cell‐like protocells (blue spheres) and other complex organic molecules (pink and green spheres) distributed across terrestrial surfaces and within subsurface niches. Volcanic landscapes and mineral‐rich substrates provide diverse geochemical settings for the assembly and evolution of ...
Pamela Knoll, Silvia Holler
wiley   +1 more source

Tides and the Evolution of Planetary Habitability

, 2008
Tides raised on a planet by its host star's gravity can reduce a planet's orbital semi-major axis and eccentricity. This effect is only relevant for planets orbiting very close to their host stars.
Brian Jackson, Delfosse X., Gorda S.Yu., Hut P., Naef D., Richard Greenberg, Rory Barnes, Sean N. Raymond   +7 more
core   +1 more source

Passive Microwave Radiometry and Active Radar Sounding as Complementary Tools for Geophysical Investigations of Icy Ocean Worlds

Journal of Geophysical Research: Planets, Volume 131, Issue 3, March 2026.
Abstract Juno Microwave Radiometer (MWR) observations of Europa and Ganymede offer critical insights into the icy shells of these moons ahead of NASA's Europa Clipper and ESA's JUpiter ICy moons Explorer (JUICE) missions. Both missions are equipped with active radar sounders designed to address key unknowns such as ice shell thickness, thermal state ...
Natalie S. Wolfenbarger, Anna L. Broome, Dustin M. Schroeder, Anton I. Ermakov, Scott J. Bolton, Donald D. Blankenship   +5 more
wiley   +1 more source

Multidisciplinary Analyses of Terrestrial Samples Used to Interpret an Inorganic Origin (Anhydrite:Ce3+) for the 304 and 325‐nm Doublet Fluorescence Detected by the Mars 2020 SHERLOC Instrument at Jezero Crater

Journal of Geophysical Research: Planets, Volume 131, Issue 3, March 2026.
Abstract Doublet fluorescence at 304 and 325‐nm under deep ultraviolet (DUV) excitation was detected on Mars at Jezero crater by the Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals (SHERLOC) instrument onboard the Mars 2020 rover Perseverance.
N. C. Haney, R. V. Morris, R. S. Jakubek, J. V. Clark, J. I. Simon, W. P. Buckley, R. T. Downs, E. B. Rampe, R. M. G. Armytage, T. G. Graff, A. S. Burton, F. M. McCubbin, E. L. Berger, V. M. Tu, P. D. Casbeer, S. A. Mertzman, K. H. Williford, E. L. Scheller, T. Fornaro, S. Siljeström, A. Steele, K. P. Hand, T. J. Lapen   +22 more
wiley   +1 more source