Results 61 to 70 of about 446 (170)

Almost billfish: convergent longirostry, micro‐dentition, and possible glandular sinuses in a large teleost fish from the Upper Cretaceous of Northern Italy

Journal of Anatomy, Volume 247, Issue 6, Page 1109-1130, December 2025.
A fossil rostrum fragment of a large teleost fish from the Upper Cretaceous of Northern Italy reveals remarkable anatomical convergences with Cenozoic and Recent billfishes (marlins, swordfishes, and akin). The extinct group Plethodidae independently acquired a long snout, micro‐teeth, and oil‐gland sinuses well before the evolution of true billfishes.
Giovanni Serafini, Jürgen Kriwet, Tommaso Toldo, Eliana Fornaciari, Jacopo Amalfitano, Giorgio Carnevale   +5 more
wiley   +1 more source

Millennial‐Scale Hydrothermal Variability at the Carlsberg Ridge Driven by Sea‐Level Change and Transient Magmatism

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 11, November 2025.
Abstract Hydrothermal systems at mid‐ocean ridges (MORs) mediate the transfer of heat and geochemical fluxes from the mantle to the hydrosphere, facilitating fluid‐rock interaction and metal cycling. While short‐term hydrothermal dynamics are well studied, the long‐term response of these systems at slow‐spreading ridges to glacial‐interglacial sea ...
Sayantan De, Sunil Kumar Singh, Robin John   +2 more
wiley   +1 more source

Microbial communities associated with ferromanganese nodules and the surrounding sediments

Frontiers in Microbiology, 2013
The formation and maintenance of deep-sea ferromanganese/polymetallic nodules still remains a mystery 140 years after their discovery. The wealth of rare metals concentrated in these nodules has spurred global interest in exploring the mining potential ...
Benjamin John Tully, John F Heidelberg
doaj   +1 more source

The Stability of Manganese Oxides Under Laser Irradiation During Raman Analyses: II. Layer Structures

Journal of Raman Spectroscopy, Volume 56, Issue 10, Page 1072-1088, October 2025.
Manganese oxides are important geomaterials with diverse technological applications. Here, we investigate the behaviour of the most common Mn oxides with layer structures under irradiation by a 532‐nm laser, with intensity ranging from 23 µW/µm2 to 36.8 mW/µm2.
Simone Bernardini, Giancarlo Della Ventura, Luigi Jovane, Armida Sodo, Boriana Mihailova   +4 more
wiley   +1 more source

Advancing Nitrate‐to‐Ammonia Electrocatalysis: Strategies in Catalyst Design, Electrolyte Engineering, and Performance Evaluation

Advanced Science, Volume 12, Issue 34, September 11, 2025.
This review highlights the latest advances in electrocatalytic nitrate reduction to ammonia, with a focus on catalyst design strategies, electrolyte engineering, and performance evaluation. Abstract The electrochemical reduction of nitrate for ammonia production not only offers a promising alternative to the traditional Haber–Bosch process, which ...
Juan Bai, Ziyou Dong, Xudong Jiang, Qianqin Zhou, Jiahao Zhao, Jun Mei, Ziqing Tan, Ting Liao, Ziqi Sun   +8 more
wiley   +1 more source

Regulations on Prospecting and Exploration of the Polymetallic Nodules in the International Seabed Area

Московский журнал международного права, 2009
The article addresses one of the key documents regarding the activity of the states on prospecting, exploration and exploitation of the mineral resources of the International seabed area – the Regulations on prospecting, exploration and exploitation of ...
A. N. Nosikov
doaj   +1 more source

Assessing benthic community structure and diversity in the Western Pacific polymetallic nodule area: insights from multi-primer eDNA metabarcoding

Frontiers in Marine Science
IntroductionDeep-sea polymetallic nodules are considered a critical resource for meeting future global metal demands. However, current knowledge of benthic community composition and biodiversity patterns in these regions remains limited, impeding ...
Ziyu Zhao, Ziyu Zhao, Ziyu Li, Ziyu Li, Xuebao He, Juan Yang, Juan Yang, Jianxin Xia, Jianxin Xia   +8 more
doaj   +1 more source

Ecological and Economic Prerequisites for the Extraction of Solid Minerals from the Bottom of the Arctic Seas

E3S Web of Conferences, 2017
The world ocean has huge reserves of minerals that are contained directly in the water, as well as on the surface of its bottom and in its subsoils. The deposits of solid minerals on the surface of the bottom of the World Ocean are considered the most ...
Myaskov Alexander, Gonchar Alexander
doaj   +1 more source

Subsea Nodule Recognition and Deployment Detection Method Based on Improved YOLOv8s

IEEE Access
An improved small-target detection model based on YOLOv8s is proposed to address the challenges associated with deep-sea polymetallic nodule detection, such as complex target shapes, small sizes, and strong environmental interference.
Jixin Li, Junchao Li, Bin Su, Yuxin Cui
doaj   +1 more source

Numerical Study and Parameter Optimization of a Dual-jet Based Large Particle Collection System for Deep-sea Mining [PDF]

Journal of Applied Fluid Mechanics
A dual-jet collecting device is highly efficient at picking up small-sized polymetallic nodules; however, its performance is not as effective for large nodules in deep-sea mining.
Y. Z. Jin, Q. K. Yao, Z. C. Zhu, X. M. Zhang   +3 more
doaj   +1 more source