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Titolo:
ORGANIC GEOCHEMISTRY OF MARINE-SEDIMENTS OF THE SUB-ANTARCTIC INDIAN-OCEAN SECTOR - LIPID CLASSES - SOURCES AND FATE
Autore:
LAUREILLARD J; PINTURIER L; FILLAUX J; SALIOT A;
Indirizzi:
UNIV PARIS 06,URA CNRS 2076,LAB PHYS & CHIM MARINES,CASE 134,TOUR 25-24,4 PL JUSSIEU F-75252 PARIS 05 FRANCE
Titolo Testata:
Deep-sea research. Part 2. Topical studies in oceanography
fascicolo: 5, volume: 44, anno: 1997,
pagine: 1085 - 1108
SICI:
0967-0645(1997)44:5<1085:OGOMOT>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANTARCTIC SEA-ICE; THIN-LAYER CHROMATOGRAPHY; FLAME IONIZATION DETECTION; EUPHAUSIA-SUPERBA DANA; DIATOM COMMUNITIES; SOUTHERN-OCEAN; MCMURDO SOUND; SPRING BLOOM; BRANSFIELD STRAIT; ACID COMPOSITION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
86
Recensione:
Indirizzi per estratti:
Citazione:
J. Laureillard et al., "ORGANIC GEOCHEMISTRY OF MARINE-SEDIMENTS OF THE SUB-ANTARCTIC INDIAN-OCEAN SECTOR - LIPID CLASSES - SOURCES AND FATE", Deep-sea research. Part 2. Topical studies in oceanography, 44(5), 1997, pp. 1085-1108

Abstract

Nine sections of core KTB16 (47 degrees 59'98 S, 55 degrees 59'74 E, 4240 m) taken from the Indian Ocean sector of the Antarctic Polar Front Zone were analyzed for their lipid class and total chlorin contents using thin-layer chromatography-flame ionisation detection (TLC/FID). The following series were included: hydrocarbons, chlorins and chlorineaters, alcohols, sterols, triacylglycerols, free fatty acids and phospholipids. For these major classes, the distribution of their individual components was determined to evaluate the source and fate of each lipid class. Relationships between the lipid composition of overlying particles and of buried material were investigated. The sediment-waterinterface was found to be of primary importance in the biogeochemicaltransformations occurring in organic matter, such as loss of the major part of the lipids, and formation of a notable unresolved complex mixture (UCM), of biological origin. Some classes such as chlorin estersappeared to convey their lipid contents from the upper layers withoutmajor alteration. In contrast, several other classes, such as storagelipids, appeared to be degraded during sedimentation, indicating extensive recycling of labile lipids in the water column. The burial efficiency and bacterial inputs downcore were highly variable depending on the class considered. Several novel compounds are reported. They consist of alkyl chlorin esters and include a wide variety of saturated andunsaturated long-chain alcohols. Owing to the lack of lipid data in the study area, these results provide an insight into the various biological and chemical processes occurring in open-sea Antarctic sedimentary environments. (C) 1997 Elsevier Science Ltd.

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Documento generato il 29/03/20 alle ore 15:37:43