Results 41 to 50 of about 657,184 (308)

Trace metal distributions in the transition zone from the Greenland Ice Sheet to the surface water in Kangerlussuaq fjord (67° N) [PDF]

The Cryosphere
Glacial rock flour (GRF), an ultra-fine sediment formed beneath glaciers, contains high concentrations of silicate and trace metals, including iron (Fe) and manganese (Mn).
C. R. Vives, J. Bendtsen, R. D. Dahms, N. Daugbjerg, K. V. Larsen, M. T. Rosing   +5 more
doaj   +1 more source

Atmospheric trace metal concentrations, solubility and deposition fluxes in remote marine air over the south-east Atlantic [PDF]

, 2015
Total and soluble trace metal concentrations were determined in atmospheric aerosol and rainwater samples collected during seven cruises in the south-east Atlantic.
Alex R. Baker, Arimoto, Baker, Baker, Baker, Baker, Baker, Baker, Baker, Barry, Bown, Boye, Buck, Bullard, Cassar, Chester, Dixon, Duce, Duce, Duce, Fomba, Gaiero, Gaiero, Ganzeveld, Gao, Guieu, Heimburger, Heimburger, Helmers, Hsieh, Jickells, Johnson, Jordi, Kim, Li, Lim, Losno, Mackie, Mahowald, Measures, Moore, Moore, Morton, Nriagu, Panzeca, Paytan, Potter, Radlein, Radlein, Rosie Chance, Saito, Sarthou, Schlitzer, Schulz, Sedwick, Shelley, Sholkovitz, Sholkovitz, Slinn, Spokes, Thuroczy, Timothy D. Jickells, Turekian, Ussher, Volkening, Witt, Witt, Xie   +67 more
core   +1 more source

Calpain small subunit homodimerization is robust and calcium‐independent

FEBS Letters, EarlyView.
Calpains dimerize via penta‐EF‐hand (PEF) domains. Using single‐molecule force spectroscopy, we measured the strength and kinetics of PEF–PEF homodimer binding. The interaction is robust, shows a transient conformational step before dissociation, and remains largely insensitive to Ca2+.
Nesha May O. Andoy, Trina Dykstra‐MacPherson, Mathias A. Bell, Peter L. Davies, Ruby May A. Sullan   +4 more
wiley   +1 more source

Distribution and environmental quality of trace metal(loid)s in water and surface sediments of northern Liaodong Bay, China

Frontiers in Environmental Science
Coastal areas such as bays, characterized by intense land-sea interactions and frequent human activities, are confronting ecological pressures induced by trace metal(loid) pollution in aquatic environments.
Yaoru Li, Yaoru Li, Zhi Qu, Zhi Qu, Yingying Liu, Yingying Liu, Chunmei Deng, Chunmei Deng, Shengtao Chen, Shengtao Chen, Weihan Yin, Weihan Yin   +11 more
doaj   +1 more source

Trace metals in populations of Marphysa sanguinea (Montagu, 1813) from Sado estuary: effect of body size on accumulation

Scientia Marina, 2009
Concentrations of Fe, Zn, Cu, Pb and Cd were measured in four surface sediments, whole worm tissues and faeces collected along Águas de Moura channel in Sado estuary. Six wet-weight worm classes were used to analyze the influence of weight.
João Garcês, M. Helena Costa
doaj   +1 more source

Trace metal analysis of element on material surface using pulse CO2 laser-induced breakdown spectroscopy applying vaporization technique

Heliyon, 2020
Trace elemental analysis on a surface of material has been recently imperative to be carried out especially in material industries. In this study, sophisticated setup of laser-induced breakdown spectroscopy has been arranged and demonstrated by employing
Ali Khumaeni, Wahyu Setia Budi, Kazuyoshi Kurihara, Hendrik Kurniawan, Kiichiro Kagawa   +4 more
doaj   +1 more source

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source

Sudden anaerobization in Amphibacillus xylanus increases intracellular labile ferrous iron and inhibits cell growth

FEBS Open Bio, EarlyView.
Abruptly changing from aerobic to anaerobic conditions (sudden anaerobization) induced growth inhibition and a significant increase in intracellular labile ferrous iron in the aerotolerant anaerobe Amphibacillus xylanus. We found that free flavins mediate efficient electron transfer from NADH to ferric iron under anaerobic conditions, suggesting that ...
Shinya Kimata, Yoichi Sakai, Keisuke Tanaka, Etsuro Yoshimura, Ken Kitano, Morio Ishikawa, Tadahiro Nakamoto, Tsutomu Takayama, Hirofumi Inoue, Kaho Nomura, Tomonori Suzuki, Masataka Uchino, Akira Abe, Youichi Niimura   +13 more
wiley   +1 more source

VLT-UVES abundance analysis of four giants in NGC 6553 [PDF]

, 2006
Metal-rich globular clusters trace the formation of bulges. Abundance ratios in the metal-rich globular clusters such as NGC 6553 can constrain the formation timescale of the Galactic bulge.
A. Alves-Brito, A. Renzini, Alonso, Alonso, Alonso, Alves-Brito, Ashman, B. Barbuy, Barbuy, Barbuy, Barbuy, Barbuy, Barbuy, Beasley, Bekki, Brodie, Busso, Carpenter, Carretta, Cayrel, Coelho, Cohen, D. Minniti, Dean, Dekker, Di Matteo, Dinescu, E. Bica, Edvardsson, Forbes, Gratton, Grevesse, Guarnieri, Harris, Hartwick, J. Meléndez, Kiselman, Kormendy, Käppeler, L. Pasquini, Lawler, M. Zoccali, Marzke, McWilliam, Meléndez, Meléndez, Meléndez, Minniti, Origlia, Ortolani, Ortolani, R. M. Rich, Rieke, Rutledge, S. Ortolani, Sagar, Spite, V. Hill, van den Bergh, Woosley, Y. Momany, Zoccali, Zoccali, Zoccali   +63 more
core   +4 more sources

Characterization of Defect Distribution in an Additively Manufactured AlSi10Mg as a Function of Processing Parameters and Correlations with Extreme Value Statistics

Advanced Engineering Materials, EarlyView.
Predicting extreme defects in additive manufacturing remains a key challenge limiting its structural reliability. This study proposes a statistical framework that integrates Extreme Value Theory with advanced process indicators to explore defect–process relationships and improve the estimation of critical defect sizes. The approach provides a basis for
Muhammad Muteeb Butt, Varma Kvvssn, Hossein Laieghi, Zia Uddin, Peyman Ansari, E. Kıvanç Sadak, Can Barış Toprak, Hüseyin Kızıl, Enrico Salvati   +8 more
wiley   +1 more source