Results 41 to 50 of about 2,346 (185)
The effect of meter-scale lateral oxygen gradients at the sediment-water interface on selected organic matter based alteration, productivity and temperature proxies [PDF]
Biogeosciences, 2012 A valid assessment of selective aerobic degradation on organic matter (OM) and its impact on OM-based proxies is vital to produce accurate environmental reconstructions. However, most studies investigating these effects suffer from inherent environmental
K. A. Bogus +5 more
doaj +1 more source
Identification and significance of unsaturated archaeal tetraether lipids in marine sediments [PDF]
Rapid Communications in Mass Spectrometry, 2014 RATIONALE Studies of archaeal glycerol dibiphytanyl glycerol tetraethers (GDGTs) in the environment and cultures have exclusively focused on compounds with fully saturated alkyl moieties. Here we report a number of novel unsaturated GDGTs (uns‐GDGTs) whose alkyl chains contain up to six double bonds and zero to ...
Chun Zhu +5 more
openaire +2 more sources
Frontiers in Marine Science, 2021 Isoprenoid glycerol dialkyl glycerol tetraethers (isoGDGTs) derived from archaea are lipid biomarkers that exhibit high sensitivity to changes in water temperature, leading to the widespread application of the isoGDGT-based tetraether index of 86 carbon ...
Jinqiang Guo +38 more
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Bacterial GDGTs in Holocene sediments and catchment soils of a high Alpine lake: application of the MBT/CBT-paleothermometer [PDF]
, 2011 A novel proxy for continental mean annual air temperature (MAAT) and soil pH, the MBT/CBT-paleothermometer, is based on the temperature (T) and pH-dependent distribution of specific bacterial membrane lipids (branched glycerol dialkyl glycerol ...
Lehmann, M. F. +34 more
core +1 more source
Journal of Lipid Research, 2015 A Förster resonance energy transfer-based fusion and transfer assay was developed to study, in model membranes, protein-mediated membrane fusion and intermembrane lipid transfer of fluorescent sphingolipid analogs.
Günter Schwarzmann +2 more
doaj +1 more source
Frontiers in Microbiology, 2020 The influence of oxidation-reduction (redox) potential on the expression of biomolecules is a topic of ongoing exploration in geobiology. In this study, we investigate the novel possibility that structures and compositions of lipids produced by microbial
Grayson M. Boyer +5 more
doaj +1 more source
Journal of Lipid Research, 2002 The basic structure and stereochemistry of the characteristic glycerol dibiphytanyl glycerol tetraether (GDGT) membrane lipid of cosmopolitan pelagic crenarchaeota has been identified by high field two-dimensional (2D)-NMR techniques.
Jaap S.Sinninghe Damsté +4 more
doaj +1 more source
Benthic archaea as potential sources of tetraether membrane lipids in sediments across an oxygen minimum zone [PDF]
Biogeosciences, 2018 Benthic archaea comprise a significant part of the total prokaryotic biomass in marine sediments. Recent genomic surveys suggest they are largely involved in anaerobic processing of organic matter, but the distribution and abundance of these archaeal ...
M. A. Besseling +5 more
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Energy flux controls tetraether lipid cyclization in Sulfolobus acidocaldarius [PDF]
Environmental Microbiology, 2019 Summary Microorganisms regulate the composition of their membranes in response to environmental cues. Many Archaea maintain the fluidity and permeability of their membranes by adjusting the number of cyclic moieties within the cores of their glycerol dibiphytanyl glycerol tetraether (GDGT) lipids.
Alice Zhou +6 more
openaire +3 more sources
, 2008 Atmospheric pressure chemical ionization liquid chromatography–tandem mass spectrometry (APCI LC-MS/MS) of tetraether lipid cores of archaeal origin reveals distinct dissociation pathways for three classes of core lipid extracted from Methanobacter ...
Keely, Brendan J. +5 more
core +1 more source