Results 211 to 220 of about 1,034,422 (264)
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Biradical Tetraether Lipids from Thermoacidophilic Archaebacteria
1988Archaebacteria are a novel class of micro-organisms, commonly encountered in exceptional ecological niches: methanogens in the absence of oxygen and in the presence of hydrogen and carbon dioxide, halophiles at high salt concentration, thermophiles at high temperature ranging from 60° to 105°. A variety of phylogenetic arguments has led some authors to
A. Gulik +3 more
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Stability and proton-permeability of liposomes composed of archaeal tetraether lipids
Biochimica et Biophysica Acta (BBA) - Biomembranes, 1994Liposomes composed of tetraether lipids originating from the thermoacidophilic archaeon Sulfolobus acidocaldarius were analyzed for their stability and proton permeability from 20 degrees C up to 80 degrees C. At room temperature, these liposomes are considerably more stable and have a much lower proton permeability than liposomes composed of diester ...
Wil N. Konings +3 more
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Molecular modeling of archaebacterial bipolar tetraether lipid membranes
Chemistry and Physics of Lipids, 2000Membranes composed of glycerol dialkylnonitol tetraether (GDNT) lipids from the thermoacidophilic archaebacterium Sulfolobus acidocaldarius have been studied by molecular modeling. GDNT membranes containing eight cyclopentane rings in the molecule are packed much tighter than those without rings.
Parkson Lee-Gau Chong, Jerome L. Gabriel
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Purification and characterization of a liposomal-forming tetraether lipid fraction
Biochemical and Biophysical Research Communications, 1990Polar lipid E, PLE, a native tetraether lipid mixture from Sulfolobus acidocaldarius is shown to spontaneously form multilamellar liposomes in aqueous media. PLE lipids were isolated as a single fraction from the crude lipid extract of S. acidocaldarius on a reverse-phase column followed by TLC and methanol precipitation.
Eddie L. Chang, Shi-Lung Lo
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Archaeal tetraether bipolar lipids: Structures, functions and applications
Biochimie, 2009Archaea have developed specific tools permitting life under harsh conditions and archaeal lipids are one of these tools. This microreview describes the particular features of tetraether-type archaeal lipids and their potential applications in biotechnology.
Thierry Benvegnu +6 more
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An unusual isoprenoid tetraether lipid in marine and lacustrine sediments
Organic Geochemistry, 2008Recent studies have shown that glycerol dialkyl glycerol tetraether (GDGT) lipids, thought be unique for (hyper)thermophilic archaea, are also present in non-thermophilic archaea and environments. In this study, an unusual H-shaped isoprenoid GDGT, in which the two biphytanyl carbon skeletons are covalently bound by a carbon-carbon bond, was ...
Stefan Schouten +3 more
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Constraints on the Biological Source(s) of the Orphan Branched Tetraether Membrane Lipids
Geomicrobiology Journal, 2009A soil profile from the Saxnäs Mosse peat bog, Sweden, has been analysed for glycerol dialkyl glycerol tetraether (GDGT) membrane lipids and 16S rRNA genes in order to constrain the source of the yet ‘orphan,’ but supposedly bacterial, branched GDGTs. Branched GDGT lipids dominate over archaeal membrane lipids.
Johan W.H. Weijers +7 more
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Selective interactions of concanavalin A‐modified tetraether lipid liposomes
physica status solidi c, 2011AbstractFor the development of site specific liposomes, high stability and long circulation properties are very promising for the improvement of drug targeting and drug delivery system as well as improvement of bioavailability of efficient bioactive drugs.
Aybike Ozcetin +4 more
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Phytochemistry, 1980
Abstract Individual di(biphytanyl) diglycerol tetraether lipids from thermoacidophile archaebacteria of the Caldariella series, with differently cyclized biphytanyl components, are separated and shown to have structures 8–12 , with the glycerol and biphytanyl components demonstrably both antiparallel and with partial assignments of stereochemistry.
DE ROSA, Mario +4 more
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Abstract Individual di(biphytanyl) diglycerol tetraether lipids from thermoacidophile archaebacteria of the Caldariella series, with differently cyclized biphytanyl components, are separated and shown to have structures 8–12 , with the glycerol and biphytanyl components demonstrably both antiparallel and with partial assignments of stereochemistry.
DE ROSA, Mario +4 more
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The organic geochemistry of glycerol dialkyl glycerol tetraether lipids: A review
Organic Geochemistry, 2013Glycerol dialkyl glycerol tetraether (GDGT) lipids are membrane lipids which were long thought to be synthesized mainly by archaea, organisms thought to be limited to extreme environments. Analysis of environmental samples over the last decade has shown, however, that their structural diversity and sources are much wider than anticipated and that they ...
Stefan Schouten +2 more
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