The sulfur cycle is driven by redox processes, among which sulfate reduction of primary importance. Sulfate reduced to sulfide either abiotically Thermochemical Reduction (TSR) or biotically Microbial (MSR). Although these two processes occur at different temperature regimes (>100 °C and <80 °C, respectively), they generate similar by-products (e.g., sulfides, elemental sulfur). 34S/32S ratio o...

Salt giants are large-scale, basin-wide deposits formed sporadically in the geological past, from early Paleozoic to late Cenozoic. Their role as sinks for seawater dissolved ions is well known, however biogeochemical conditions that accompany salt giant formation and their effects on carbon cycling remain poorly constrained. Here we show massive gypsum of Mediterranean – youngest Earth a parti...

Stable isotope tracing is a powerful method for interrogating metabolic enzyme activities across the metabolic network of living cells. However, most studies of mammalian cells have used (13)C-labeled tracers only and focused on reactions in central carbon metabolism. Cellular metabolism, however, involves other biologically important elements, including nitrogen, hydrogen, oxygen, phosphate an...

The assessment of provenance of heparin is becoming a major concern for the pharmaceutical industry and its regulatory bodies. Batch-specific [carbon (δ(13) C), nitrogen (δ(15) N), oxygen (δ(18) O), sulfur (δ(34) S), and hydrogen (δD)] stable isotopic compositions of five different animal-derived heparins were performed. Measurements readily allowed their differentiation into groups and/or subg...

*Correspondence: Marianne Holmer, Department of Biology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark e-mail: [email protected] Sulfide intrusion in seagrasses, as assessed by stable sulfur isotope signals, is widespread in all climate zones, where seagrasses are growing. Seagrasses can incorporate substantial amounts of 34S-depleted sulfide into their tissues wit...

Isotopic compositions of sulfur and concentrations of sulfur and carbon have been measured for sedimentary rocks across terrestrial Cretaceous-Tertiary (K-T) boundary successions that originated from flood-plain and backswamp environments. Organic carbon contents are relatively constant below the boundary (26 cm for the Dogie Creek section and 9 cm for the Brownie Butte section), but change abr...

Various geochemical proxies have been developed to determine if ancient sedimentary strata were deposited in marine or nonmarine environments. A critical parameter for proxy reliability is the residence time of aqueous species seawater, which rarely considered relying on stable isotopes and elemental abundance ratios. Differences may affect our ability track geologically short-lived alternation...

Located at the intersection of Tethys and Pacific Rim metallogenic belts, Laojunshan polymetallic province in SE Yunnan Province hosts many large-scale W–Sn Sn–Zn deposits. The newly discovered Caiyuanzi medium-sized Pb–Zn deposit is located northern part this has eight sulfide ore bodies. All bodies occur siliceous rocks Lower Devonian Pojiao Formation (D1p). are conformable with stratigraphy ...

Lacustrine record of marine aerosol input has rarely been documented. Here, we present the sulfur geochemistry during the last deglaciation and early Holocene of a sediment core retrieved from the Dongyuan Lake in southern Taiwan. An unusually high sulfur peak accompanying pyrite presence is observed at 10.5 ka BP. Such high sulfur content in lacustrine record is unusual. The δ34S of sulfur var...