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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Interpretation of carbon stable isotope data from lake sediment archives
 Lánová, Zuzana ; Tátosová, Jolana (advisor) ; Jandová, Kateřina (referee)
Lake sediments consist of terrestric plant matter, lacustrine plancton primary production and microbial lake biomass. All of these organism groups discriminate during C-substate fixation and/or its further assimilation heavier and more stable 13 C carbon at a certain ratio, which is reflected by 13 C concentration in their biomass and consequently in sediments. The reason of discrimination at these enzymatically controlled biochemical reactions lies at kinetic fractionation controlled by binding energies of chemical substances. Isotopic signature contained in organic matter of lake sediments can be influenced by photosyntesis intensity, formation of anoxic zone allowing methanogenic a methanotrophic bacteries activity, lake trophic state or hydrologic isolation (long periods of drought). Keywords: Paleolimnology, carbon isotopes, discrimination processes, lake sediments
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Carbon isotopes as a tool for study of palaeoclimate
 Zahajská, Petra ; Kvaček, Jiří (advisor) ; Trubač, Jakub (referee)
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Carbon isotopes as a tool for study of palaeoclimate
 Zahajská, Petra ; Kvaček, Jiří (advisor) ; Trubač, Jakub (referee)
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