Results 51 to 60 of about 748 (152)

Iron Sulfides Produced by Thermococcales: An Iron Detoxification Mechanism

Environmental Microbiology, Volume 28, Issue 1, January 2026.
Thermococcales, archaea from hydrothermal vents, promote iron sulfide precipitation, enabling survival in iron‐rich environments. Some cells become encrusted in pyrite and do not survive mineralization, while surviving cells activate metal detoxification genes. This biomineralization process allows the population to withstand toxic iron concentrations,
T. Mariotte, R. Coudray, C. Toffano‐Nioche, F. Guyot, A. Gorlas   +4 more
wiley   +1 more source

Matuyama–Brunhes geomagnetic reversal record and associated key tephra layers in Boso Peninsula: extraction of primary magnetization of geomagnetic fields from mixed magnetic minerals of depositional, diagenesis, and weathering processes

Earth, Planets and Space, 2022
We report paleomagnetic records of Matuyama–Brunhes geomagnetic polarity reversal and associated key tephra layers from the Early–Middle Pleistocene marine sedimentary succession in the Boso Peninsula. The outcrop is in Terasaki, Chiba, Japan and ~ 25 km
Hirokuni Oda, Hiroomi Nakazato, Futoshi Nanayama, Yumiko Harigane   +3 more
doaj   +1 more source

Stabilisation of Sulfide‐Bearing Clays as a New Building Ground

European Journal of Soil Science, Volume 77, Issue 1, January–February 2026.
ABSTRACT Fine‐grained, sulfide‐bearing marine clays are found along the Finnish coastline. When excavated and exposed to air, the sulfides within these soils react with oxygen to form sulfuric acid. Such soils are classified as hypersulfidic soils.
Thomas Kronberg, Jan‐Erik Eriksson, Miriam Nystrand, Peter Österholm, Leena Hupa   +4 more
wiley   +1 more source

Occurrence and characterization of nanosulfide‐rich regions on asteroid Ryugu: Insights from mackinawite and pyrrhotite

Meteoritics &Planetary Science, Volume 61, Issue 1, Page 168-181, January 2026.
Abstract Samples returned from asteroid Ryugu by the Hayabusa2 mission are dominated by fine‐grained matrix material made of phyllosilicates and nanosulfides. Here, we report the mineralogical, textural, and chemical characteristics of nanosulfide‐rich regions identified in Ryugu particles.
Roberto Conconi, Hugues Leroux, Maya Marinova, Sylvain Laforet, Damien Jacob, Léna Jossé, Alice Aléon‐Toppani, Zélia Dionnet, Rosario Brunetto, Corentin Le Guillou   +9 more
wiley   +1 more source

Effect of Polyethylene Glycol on the Formation of Magnetic Nanoparticles Synthesized by Magnetospirillum magnetotacticum MS-1. [PDF]

PLoS ONE, 2015
Magnetotactic bacteria (MTB) synthesize intracellular magnetic nanocrystals called magnetosomes, which are composed of either magnetite (Fe3O4) or greigite (Fe3S4) and covered with lipid membranes.
Hirokazu Shimoshige, Hideki Kobayashi, Toru Mizuki, Yutaka Nagaoka, Akira Inoue, Toru Maekawa   +5 more
doaj   +1 more source

Gold Mineralizing Potential of the Late Triassic Calcareous, Carbonaceous and Sulfide‐Rich Sedimentary Rocks of the Isatomae Formation in the South Kitakami Belt, Japan

Resource Geology, Volume 76, Issue 1, January‐December 2026.
Isatomae Formation illustrating mineralogical and geochemical characteristics. (a) Overview of the Isatomae Formation, showing the marine anoxic environment and related biogenic processes. (b) Deposition of metal‐rich Fe oxyhydroxides were transformed into sulfides through diagenesis and low grade metamorphism.
June Born Born, Yasushi Watanabe, Takuya Echigo, Yoshiaki Kon, Takumi Mimura   +4 more
wiley   +1 more source

Structure and evolution of the magnetochrome domains: no longer alone

Frontiers in Microbiology, 2014
Magnetotactic bacteria (MTB) can swim along Earth’s magnetic field lines, thanks to the alignment of dedicated cytoplasmic organelles. These organelles, termed magnetosomes, are proteolipidic vesicles filled by a 35-120 nm crystal of either magnetite or ...
Pascal eArnoux, Pascal eArnoux, Pascal eArnoux, Marina I Siponen, Marina I Siponen, Marina I Siponen, Christopher T Lefèvre, Christopher T Lefèvre, Christopher T Lefèvre, Nicolas eGinet, Nicolas eGinet, Nicolas eGinet, David ePignol, David ePignol, David ePignol   +14 more
doaj   +1 more source

Seawater sulphate heritage governed early Late Miocene methane consumption in the long-lived Lake Pannon

Communications Earth & Environment, 2023
Sulphate deficiency makes lake environments a key source of atmospheric methane because sulphate-driven anaerobic oxidation of methane (SD-AOM) is hindered. Miocene to Pliocene Lake Pannon was the largest European lake, although the extent of its methane
Zhiyong Lin, Harald Strauss, Jörn Peckmann, Andrew P. Roberts, Yang Lu, Xiaoming Sun, Tingting Chen, Mathias Harzhauser   +7 more
doaj   +1 more source

Identifying Framboidal Pyrrhotite: A Proxy for Hydrothermal Alteration of Organic‐Rich Sediments

Geophysical Research Letters, Volume 52, Issue 23, 16 December 2025.
Abstract Framboidal pyrrhotite, in sharp contrast to framboidal pyrite, has been rarely reported, and its formation remains poorly understood. Here we report its clear identification in a shale‐gas well core and explore its potential as a proxy for diagenesis or low‐grade metamorphism of organic‐rich sediments.
Y. Wang, D. Jia, A. R. Muxworthy, Y. Zhang, L. Qi, C. Z. Jia, L. Liu, N. Jiang   +7 more
wiley   +1 more source

Preparation of gold nanoparticles and carbon dots by hydrothermal reaction of bovine haemoglobin with chloroauric acid and energy band bending in carbon dots

Journal of Experimental Nanoscience, 2017
The incubation and hydrothermal reaction under alkaline condition of bovine haemoglobin with chloroauric acid were investigated. The products in the supernatant from the centrifuge were found to be gold nanoparticles and carbon dots. Greigite (Fe3S4) was
Zhao Chun Zhang, Qi Liang Ma, Jian Lin Li   +2 more
doaj   +1 more source