Sulfur and Carbon Isotopes as Tracers of Salt-Marsh Organic Matter Flow

Biogeochemistry of the stable isotopes of hydrogen and carbon in salt marsh biota.

Deuterium to hydrogen ratios of 14 plant species from a salt marsh and lagoon were 55 per thousand depleted in deuterium relative to the environmental water. Carbon tetrachloride-extractable material from these plants was another 92 per thousand depleted in deuterium. This gave a fractionation factor from water to CCl(4) extract of 1.147. This over-all fractionation was remarkably constant for ...

Organic Carbon and Organic Matter Levels in Sediments of the Strait of Hormoz, the Persian Gulf

Total organic carbon has a major influence on both the chemical and biological processesthat take place in sediments. Algal bloom is one of the organic carbon levels in aquatic ecosystems. In 2009 algal bloom occurred in the Hormozgan province and prolonged for months, which finally setteled down in 2010. In this study the variations of total organic carbon (TOC), organic matter (TOM) and tot...

Sulfur isotopes of organic matter preserved in 3.45-billion-year-old stromatolites reveal microbial metabolism.

The 3.45-billion-year-old Strelley Pool Formation of Western Australia preserves stromatolites that are considered among the oldest evidence for life on Earth. In places of exceptional preservation, these stromatolites contain laminae rich in organic carbon, interpreted as the fossil remains of ancient microbial mats. To better understand the biogeochemistry of these rocks, we performed microsc...

Sulfur isotopes of organic matter preserved in 3.45 Gyr- old stromatolites reveal microbial metabolism

Stable carbon isotopes in exhaled breath as tracers for dietary information in birds and mammals.

The stable carbon isotope ratio of exhaled CO(2) (delta(13)C(breath)) reflects the isotopic signature of the combusted substrate and is, therefore, suitable for the non-invasive collection of dietary information from free-ranging animals. However, delta(13)C(breath) is sensitive to changes in ingested food items and the mixed combustion of exogenous and endogenous substrates. Therefore, experim...