Browsing Naturwissenschaften, Mathematik und Informatik by Referee "Reitner, Joachim Prof. Dr."
Now showing items 1-20 of 25
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Carbonate factories in the early Archean and their geobiological impacts
(2023-08-08)Paleoarchean carbonates in the Pilbara Craton (Western Australia) are important archives for early life and environment on early Earth. Amongst others, carbonates occur in interstitial spaces of ca. 3.5–3.4 Ga pillow basalts ... -
A geobiological approach to carbonate factories and ecosystem changes across the Permian–Triassic boundary
(2022-04-05)Contemporary climate change is accelerating. Meanwhile, “Has the Earth’s sixth mass extinction already arrived?” is inquired. The Permian–Triassic crisis, as a possible analog in the Earth history, has aroused great ... -
Structure and function of microbial communities involved in biomineralization
(2022-01-27)Different aspects of carbonate precipitation are considered in this study. The first part examines carbonates in a model system that helps to explain the initial steps in the formation of so-called concretions, which are ... -
Paläoökologische Interaktionen von Organismen aus Baltischem und Bitterfelder Bernstein
(2020-11-06)Because of the quick fixation and detailed conservation of millions-of-years-old arthropods, other small animals and plant parts, amber is very suitable for the conservation of ancient behaviours and interactions. In this ... -
Symbiotic adaptation of prokaryotic microorganisms in extreme deep-sea environments
(2019-04-10)Extreme deep-sea environments are widespread and intensively studied in the last decades. They are of special interest since living organisms in those habitats happen to live at the expenses of the fluids emitted from the ... -
Isotopengeochemische Untersuchungen an postglazialen Karbonaten des Neoproterozoikums aus China und Namibia
(2017-12-22)The Neoproterozoic time, especially the Cryogenian is characterised by extreme climate conditions. Two of the known global glaciations – the Sturt and Marinoan – occurred during this period. In the following Ediacaran ... -
Insights into the Holobiont of the Early Branching Metazoan Vaceletia sp. and its Biomineralization Strategy
(2017-12-05)Sponges are evolutionary and ecologically very successful animals. They are abundant and significant members of benthic communities throughout the world’s oceans. Having emerged during the Neoproterozoic era, sponges are ... -
Recrystallization of pedogenic and biogenic carbonates in soil: Environmental controls, modelling and relevance for paleoenvironmental reconstructions and dating
(2017-05-30)The reliability of paleoenvironment (paleoclimate, paleovegetation etc.) interpretations and radiocarbon ages based on isotopes of carbon (δ13C, 14C), oxygen (δ18O) and clumped isotopes (Δ47) in soil carbonates types e.g. ... -
Assessments of phenotypic variations and variability as a tool for understanding evolutionary processes in echinoids
(2016-07-20)The following three chapters can be regarded as thematic complexes of studies on phenotypic variations and variability in order to elucidate their origins on a systematic hierarchy-level in echinoids. Chapter 2 seeks ... -
“Keratose” sponge fossils and microbialites: a geobiological contribution to the understanding of metazoan origin
(2015-02-18)Molecular clock and the fossil record at the Precambrian-Cambrian boundary indicate that animals probably had a long evolutionary history in the Precambrian which is still poorly explored and understood. This PhD study was ... -
Molecular and cellular differentiation during the early shell field development in Lymnaea stagnalis
(2014-02-13)Since the evolutionary emergence of the molluscan shell in the Pre-Cambrian, diverse shell forms have evolved, which are adapted to various ecological environ-ments. The innovation of the shell facilitated the vast ... -
Raman spectroscopy in Geobiology - Advances in detection and interpretation of organic signatures in rocks and minerals
(2014-01-21)In this thesis, Raman spectroscopy was applied to a broad range of rock types in order to test the ability of detecting and interpreting organic signals. In the field of geobiology Raman spectroscopy is relatively new, and ... -
The evolution of the Ascomycota new insights from Mesozoic and Cenozoic amber fossils
(2013-08-14)This thesis contributes to the knowledge of the evolutionary history and palaeoecology of the Ascomycota (sac fungi). The six included papers are based on the investigation of Cretaceous and Palaeogene amber inclusions and ... -
Probing molecular tracers in geobiological systems using imaging mass spectrometry
(2013-05-06)In this thesis ToF-SIMS was applied to the study of geobiological samples. Except for a few pioneering studies, ToF-SIMS has rarely been used in the field of geobiology and thus only a limited number of SIMS reference ... -
Fluid venting structures of terrestrial mud volcanoes (Italy) and marine cold seeps (Black Sea) -Organo-geochemical and biological approaches
(2012-03-06)Two different fluid venting structures, marine cold seeps of the Black Sea and terrestrial mud volcanoes of Italy, were part of this thesis. Both were formed by the expulsion of water, mud ... -
Metabolismus und Biomineralisation in anaerob Methan-oxidierenden Lebensgemeinschaften
(2011-03-15)Anaerobic oxidation of methane (AOM) is recognized as one key process of methane consumption in oceans. According to phylogenetic and metagenomic analyses, the process is carried out by ... -
An integrated approach to the study of biosignatures in mineralizing biofilms and microbial mats
(2011-02-02)In this thesis project, biomarkers, biomineralization processes and TREE (trace and rare earth elements) patterns in mineralizing microbial mats were established and tested as biosignatures ... -
Paläoökologische und geochemische Studien auf Schwamm-Mikroinkrustrierer- Gemeinschaften ausgewählter Cipit Kalke aus der St. Cassian Formation (Unterkarn, Obertrias) von der Dolomiten, Nordostitalien
(2010-12-23)The Lower Carnian St. Cassian Formation (Dolomites, NE Italy) is well known for its very diverse and exceptionally well-preserved fauna. It dates from Middle to Late Triassic and comprises ... -
Microbial metabolisms and calcification in freshwater biofilms
(2008-04-18)In this study, biofilms of two CO2-degassing karst-water creeks in Germany, which attain high calcite supersaturation during their course downstream, were investigated with regard to the effects of microbial activity ... -
Geochemie Porifera-reicher Mud Mounds und Mikrobialithe des Mittel- und Oberdevons (Westaustralien, Nordfrankreich)
(2006-05-09)Mud mounds and microbialites of the Boulonnais (Northern France) and from the reefal slope facies of Upper Devonian reef complexes (Western Australia) were investigated by geochemical and ...