A laboratory experiment of intact polar lipid degradation in sandy sediments

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چکیده

منابع مشابه

Fossilization and degradation of archaeal intact polar tetraether lipids in deeply buried marine sediments (Peru Margin).

Glycerol dibiphytanyl glycerol tetraether (GDGT) lipids are part of the cellular membranes of Thaumarchaeota, an archaeal phylum composed of aerobic ammonia oxidizers, and are used in the paleotemperature proxy TEX86 . GDGTs in live cells possess polar head groups and are called intact polar lipids (IPL-GDGTs). Their transformation to core lipids (CL) by cleavage of the head group was assumed t...

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High-Frequency Scattering from Water Saturated Sandy Sediments: Laboratory Study

Reported measurements of seabed scattering are largely confined to relatively low frequencies, up to 300 kHz, see, e.g., [Jackson and Richardson] and references therein. Still higher frequencies, up to a few megahertz, are used in seafloor imagery (e.g., in pencil-beam sonars), particularly to observe dynamic processes at the seafloor in shallow water. From the physics of sound-sediment interac...

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A laboratory experiment on the behaviour of soil-derived core and intact polar GDGTs in aquatic environments

We have performed incubation experiments in order to examine the behaviour of soil-derived branched glycerol dialkyl glycerol tetraether (brGDGT) membrane lipids upon entering an aquatic environment and to evaluate the processes that potentially take place during their fluvial transport from land to sea. We incubated a soil from the Rakaia River catchment on the South Island of New Zealand usin...

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Laboratory Investigations and Numerical Modeling of Loss Mechanisms in Sound Propagation in Sandy Sediments

During the Sediment Acoustics Experiment 2004 (SAX04), extensive efforts were made to determine the size distribution, spatial distribution, shape, and composition of shell hash and other objects in the sediment that were larger than the average sand grain size. This data will be used in conjunction with other environmental measurements to model the scattering from, and penetration into the sed...

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Fiddler crab control of cordgrass primary production in sandy sediments

The cordgrass Spartina alterniflora Loisel is a foundation species critical to the establishment and maintenance of western Atlantic salt marshes. Although the factors regulating cordgrass growth along sheltered, fine-sediment shorelines have been exhaustively studied, less is known about the mechanisms that maintain cordgrass production in high-energy marshes characterized by sandy substrates....

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ژورنال

عنوان ژورنال: Biogeosciences Discussions

سال: 2011

ISSN: 1810-6285

DOI: 10.5194/bgd-8-3289-2011