Redox Chemistry and Molybdenum Burial in a Mesoproterozoic Lake
نویسندگان
چکیده
منابع مشابه
Redox chemistry of molybdenum in natural waters and its involvement in biological evolution
The transition element molybdenum (Mo) possesses diverse valances (+II to +VI), and is involved in forming cofactors in more than 60 enzymes in biology. Redox switching of the element in these enzymes catalyzes a series of metabolic reactions in both prokaryotes and eukaryotes, and the element therefore plays a fundamental role in the global carbon, nitrogen, and sulfur cycling. In the present ...
متن کاملRedox heterogeneity of subsurface waters in the Mesoproterozoic ocean.
A substantial body of evidence suggests that subsurface water masses in mid-Proterozoic marine basins were commonly anoxic, either euxinic (sulfidic) or ferruginous (free ferrous iron). To further document redox variations during this interval, a multiproxy geochemical and paleobiological investigation was conducted on the approximately 1000-m-thick Mesoproterozoic (Lower Riphean) Arlan Member ...
متن کاملChemistry and biology of the molybdenum cofactor.
Genetic and biochemical studies have established that in all molybdenum-containing enzymes, with the exception of nitrogenase, the metal is part of a complex called the molybdenum (Mo) cofactor (Johnson, 1980). The cofactor was originally characterized by its ability to reconstitute the apoprotein of the enzyme nitrate reductase in crude extracts of cells of the nif-l mutant of Neurospora crass...
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Introduction: The Tagish Lake carbonaceous chondrite has been the focus of much attention since its isotopic, trace element, and mineralogic properties demonstrate a unique history [1-5]. We have analyzed both pristine and disturbed Tagish Lake samples for 12 major and minor elements by ICPMS and ICPOES. When combined with data collected earlier [1], this brings the total number of elements qua...
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this study intends to investigate samuel beckett’s waiting for godot and endgame under the lacanian psychoanalysis. it begins by explaining the most important concepts of lacanian psychoanalysis. the beckettian characters are studied regarding their state of unconscious, and not the state of consciousness as is common in most beckett studies. according to lacan, language plays the sole role in ...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2019
ISSN: 0094-8276,1944-8007
DOI: 10.1029/2019gl083316