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Упит dcterms_subject_txt:biomarkers

2 items

  • The use of biological markers in determination of origin and type of organic matter in the Tisza river sediments

    Snežana Štrbac, Gordana Gajica, Aleksandra Šajnović, Nebojša Vasić, Ksenija Stojanović, Branimir Jovančićević (2013)
    The objective of the study was to determine the origin and type of organic matter (OM) of the Tisza recent sediments along the distance of 153 km through the territory of Serbia. For this purpose group organic-geochemical parameters and biomarker compositions were used. All samples contain approximately same amount of OM, which was deposited under uniform, slightly reducing conditions. Based on the distribution of n-alkanes, the origin and type of OM could not be precisely estimated. However, n-alkane patterns ...
    sediments, Tisza River, organic matter, biomarkers, oil pollutants
    ... extent, to crude oils from the Elemir and Rusanda oil fields. Keywords: sediments; Tisza River; organic matter; biomarkers; oil pollutants. INTRODUCTION Biological markers (biomarkers) in bitumen (soluble organic matter extracted from sediments, coals, oil shales and source rocks) and oil are complex ...
    ... recent sediments, due to their higher maturity.1,9 How- ever, different crude oils show unequal distributions of biomarkers. Each oil is characterized by a distinctive distribution of biomarkers as a kind of “finger- print”, which depends on the origin, depositional environment, age, maturity, relative ...
    ... sediments, apart from immature singenetic organic matter, contain oil pollutants of anthropo- genic origin. The identical compositions of these biomarkers in all samples con- firmed that the recent sediments of the Tisza River, from Kanjiža Town to the confluence into the Danube River, contain the ...

  • A comparative study of the molecular and isotopic composition of biomarkers in immature oil shale (Aleksinac deposit, Serbia) and its liquid pyrolysis products (open and closed systems)

    Gordana Gajica, Aleksandra Šajnović, Ksenija Stojanović, Jan Schwarzbauer, Aleksandar Kostić, Branimir Jovančićević (2021)
    The molecular and isotopic composition of biomarkers in initial bitumen isolated from immature (0.41% Rr) oil shale samples (Aleksinac deposit) and liquid products obtained by pyrolysis in open (OS) and closed (CS) systems are studied. The influence of pyrolysis type and variations of kerogen type on biomarkers composition and their isotopic signatures in liquid products is determined. The applicability of pyrolysis type, numerous biomarkers and carbon isotopic compositions (δ13C) of n-alkanes in liquid pyrolysates is established. Pyrolysis experiments were ...
    Uljni šejl, Aleksinac, organska supstanca, otvoreni i zatvoreni sistem pirolize, biomarkeri, izotopski sastav ugljjenika