Sulfur isotope ratios (δ34S) can also be used to identify sources of sulfate, especially if combined with oxygen isotope ratios of sulfate (Krouse and Mayer, 2000). In mining areas, oxidation of sulfide minerals and organic sulfur compounds (e.g. in coal mines) are often predominant, while...
oxygen and sulfur isotopesmetasomatized mantle sourcecentral anatoliaTurkeyLate Cretaceous granitoid rocks from central Anatolia comprise S-I-A-type plutons derived from the collisional stages of the Neo-Tethyan convergence system in central Turkey. These granitoids intrude the tectonic imbrication zone ...
Absolute rate constants for the transfer of oxygen and sulfur atoms to these carbenes have been determined in both acetonitrile and cyclohexane solvents. These carbenes abstract oxygen and sulfur atoms with bimolecular rate constants ranging from 104 to 1010 M-1 s-1 at 22 °C. Ylides from ...
With SO2 present in the gas stream, NO2 also reacted with S(IV), a product of SO2 removal, on the exterior of an alkaline solid. The oxidation of S(IV) to S(VI) by oxygen reduced the availability of S(IV) and lowered removal of NO2. Subsequent acidification of the sorbent by ...
Oxygen-enriched atmosphere in combustion facilitated decomposition of organic fractions, and shifted release regions towards lower temperatures. The decomposition of amine-N functionality contributed to NH3 release below 200 °C. With temperature increasing, heterocyclic-N began to decompose and release ...
(−43 °C to 45 °C) were obtained, and they have variable mechanical properties, some of them are flexible and elastic, and some of them are stiff and relatively strong, which can be accurately controlled by chain length of linear segment of crosslinker combined with molar ration of...
Here, we demonstrate an ambient-temperature aqueous rechargeable flow battery that uses low-cost polysulfide anolytes in conjunction with lithium or sodium counter-ions, and an air- or oxygen-breathing cathode. The solution energy density, at 30–145 Wh/L depending on concentration and sulfur ...
The cell membrane is impermeable to viruses—to get inside and infect a cell, they use a range of strategies to exploit the cellular and biochemical properties of the membranes. The thiol-mediated uptake of organic molecules similar to alcohols, where oxygen is replaced by a sulfur atom, is ...
There are two different pathways for the biosynthesis of the corrin ring of cobalamin that are termed the aerobic (oxygen-dependent) and the anaerobic routes. The cobalamin biosynthetic genes in D. vulgaris suggest that it operates an anaerobic pathway, which would be consistent with the natural ...
The prosthetic groups of iron–sulfur proteins fall into several classes (Lovenberg, 1977;Spiro 1982). Rubredoxins bind single iron atoms with four cysteinyl sulfur ligands; they function as electron carriers in some bacterial systems. Rubredoxins generally have two such centers per molecule; in...