Results 121 to 130 of about 21,160 (248)

Polyglycine Strands Within a Collagen Triple Helix

Biopolymers, Volume 117, Issue 6, November 2026.
ABSTRACT The collagen triple helix is the most abundant protein structural motif in animals. It tolerates any amino acid in its Xaa and Yaa positions but demands glycine (Gly) at every third position, where the residue packs into the sterically forbidding core of the triple helix and donates the recurring interstrand N–H⋯OC hydrogen bond that stitches
Wasin Tiarawut, Gabriel Saenz, Jinyi Yang, Ronald T. Raines   +3 more
wiley   +1 more source

Oxygen Isotopes in Several Yamato Meteorites [PDF]

, 1978
P(論文)Oxygen isotopic compositions (^O/^O and ^O/^O) of five Yamato meteorites have revealed that Yamato-7303 (m), -74190,-74191,and -7308 (l), -74013 can be classified as L ordinary chondrites and differentiated meteorites, respectively. The former three
Clayton, Robert N., Mayeda, Toshiko K., Yanai, Keizo, Onuma, Naoki   +3 more
core  

Hydrothermal Sealing at Turrialba, Poás, and Rincón de la Vieja Volcanoes (Costa Rica) Promotes Phreatic and Phreatomagmatic Eruptions

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 11, November 2026.
Abstract Hydrothermal sealing is a mechanism thought to be responsible for challenging‐to‐forecast phreatic and phreatomagmatic eruptions. To better understand this process, we present a study in which we assessed the textural, mineralogical, and physical properties (porosity, permeability, and tensile strength) of blocks of hydrothermal seal that were
Michael J. Heap, Geoffroy Avard, Claire E. Harnett, H. Albert Gilg, James Hickey, Thierry Reuschlé, Fabian B. Wadsworth, Maëlys Moulin, Sophie Pearson‐Grant, J. Maarten de Moor, Emily Mick, Patrick Baud   +11 more
wiley   +1 more source

Laboratory Experiments Identify Meteoritic Organic Precursors for Chlorinated Compounds Detected by the Sample Analysis at Mars (SAM) Instrument at Gale Crater

Journal of Geophysical Research: Planets, Volume 131, Issue 11, November 2026.
Abstract The Viking missions landed two spacecraft on Mars each equipped with a pyrolysis‐gas chromatograph‐mass spectrometer system capable of detecting signs of life. Although working as intended, detections of chloromethane and dichloromethane were initially attributed to terrestrial contamination.
A. Mojarro, J. Herrera, A. Sistiaga, S. S. O’Reilly, J. C. Aponte, A. Buch, J. L. Eigenbrode, D. P. Glavin, C. Freissinet, M. Millan, C. Szopa, R. E. Summons   +11 more
wiley   +1 more source

Three-Step Proton Irradiation of Meteorites: Structural and Compositional Evolution Under Space-like Irradiation

Geosciences
This study reveals the effects of artificial space-like proton irradiation on three meteorite samples that are Northwest Africa (NWA) 4560 LL3.2 and NWA 5838 H6 chondrite meteorites, as well as the Dhofar (Dho) 007 eucrite.
Dániel Rezes, Ildikó Gyollai, Sándor Biri, Krisztián Fintor, Zoltán Juhász, Richárd Rácz, Béla Sulik, Máté Szabó, Bernadett D. Pál, Ákos Kereszturi   +9 more
doaj   +1 more source

Meteorites paper

The data have been used in the meteorites paper and can be shared with ...
Li, Wenqi
core   +10 more sources

Sulfidation Reaction Mechanisms of Olivine and Diopside at Mercury's Reducing Conditions

Journal of Geophysical Research: Planets, Volume 131, Issue 11, November 2026.
Abstract The surface of Mercury contains elevated amounts of sulfur of up to 4 wt.%. Volcanic degassing of S from the interior of the planet could have initiated sulfidation reactions between the degassed S and surface materials in the planet's past, leading to the observed surface S enrichment.
Rody C. Erftemeijer, Thomas Müller, Christian J. Renggli   +2 more
wiley   +1 more source

Magnetic Imaging of the Effect of Stress on the Remanent Magnetization of Basalt

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract Differential compressional stresses (<100 MPa) that do not result in permanent deformation have traditionally been considered insufficient to modify paleomagnetic signals; however, recent numerical predictions have challenged this assumption.
A. R. Muxworthy, M. E. Kosters, B. M. de Groot, T. M. Mitchell, A. R. Thomson, B. Kugabalan, L. Qi, L. V. de Groot   +7 more
wiley   +1 more source

Quantifying the Effects of Nickel on Earth’s Inner‐Core Nucleation

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract The formation of Earth’s solid inner core marks a major transition in the thermal and chemical evolution of the deep Earth, yet its origin remains paradoxical, as initial nucleation appears to require unrealistically large undercooling in the outer core.
Jiahui Zhai, Liangrui Wei, Chen Gao, Yang Sun   +3 more
wiley   +1 more source

Evaluation of simulated space weathering-based meteorite alteration and potential influence on mechanical deformation of rubble pile asteroids

Frontiers in Astronomy and Space Sciences
Asteroids with the potential to impact Earth have become a significant focus of scientific research and applied space technology. These bodies are expected to be key targets for mitigation actions and space mining activities in the coming decades ...
A. Kereszturi, A. Kereszturi, I. Gyollai, I. Gyollai, S. Biri, Z. Juhász, Cs. Király, Cs. Király, B. D. Pál, B. D. Pál, R. Rácz, D. Rezes, D. Rezes, B. Sulik, M. Szabó, M. Szabó, Z. Szalai, Z. Szalai, Z. Szalai, P. Szávai, P. Szávai   +20 more
doaj   +1 more source