Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 259 for “"Archaea"”.
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Archaea
Archaea is an orchestral work which depicts an imaginary ancient landscape; a city I have cobbled together in my imagination from places with which I have become familiar recently. The three sections of the work show the landscape throughout the day: the first movement depicts the blinding light of …
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Selenoprotein-Biosynthese in Archaea
… Selenocystein-spezifischen Translationsfaktor in Archaea (aSelB) dar. Das in der nicht-translatierten mRNA-Region liegende SECIS-Element wird allerdings (im Unterschied zu SelB von E. coli) nicht von aSelB gebunden. d) Es konnten mehrere SECIS-bindende, und ein aSelB-bindendes Protein …
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Protein Phosphorylation in Archaea
… as a means of regulation also exists in Archaea. Previously, in the sulfur-dependent archaeon Sulfolobus solfataricus a gene was cloned encoding a protein-serine/threonine phosphatase that was similar to eucaryal protein-serine/threonine phosphatases type 1, 2A, and 2B. To identify …
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Surface Sorption Properties of Halophilic Archaea
… sedimentary diagenesis, and soil formation. Archaea are ubiquitous in near-surface water-rock systems and numerous laboratory and field studies have demonstrated that Archaea can facilitate the formation and dissolution of minerals, potentially enhancing or inhibiting contaminant transport. …
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Dynamic Regulation of Metabolism in Archaea
… is known about the regulation of metabolism in archaea. Previous work identified the winged helix-turn-helix transcription factor TrmB as a major regulator of metabolism in the model archaeon Halobacterium salinarum. TrmB was found to bind to the promoter of 113 genes in the absence of glucose. …
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Hydrogen isotope fractionation in ammonia-oxidizing archaea
… (GDGT) membrane lipids of ammonia-oxidizing archaea (class Nitrososphaeria) as a novel palaeohydrological proxy has gained increasing attention. This PhD thesis investigates the hydrogen isotope fractionation (2εL/W) in Nitrososphaeria to assess the suitability of δ2H of GDGT-derived …
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Structural Studies of DNA Replication Machinery in Archaea
… and eukaryotes. However, DNA replication in archaea, the third domain of life, is not well characterized. Accumulating evidence indicates that archaeal DNA replication machinery is more homologous to that of eukaryotes but presents a simpler molecular architecture. The aim of my thesis work …
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GUIDE RNA-DEPENDENT AND INDEPENDENT tRNA MODIFICATIONS IN ARCHAEA
… deviates considerably from its homologs in other Archaea. We also identified a novel L7Ae (a core protein associated with archaeal methylation guide RNPs) binding motif in sR-tMet. ψ54, the near universal modification found in TψC stem-loop of archaeal tRNAs is catalyzed by the protein …
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Activity of methanogenic archaea under simulated Mars analog conditions
… Therefore the phylogenetically old methanogenic archaea, which have evolved under early Earth conditions, are often used as model-organisms in astrobiological studies to investigate the potential of life to exist in possible extraterrestrial habitats on our neighboring planet. In this thesis …
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Dual-specific protein phosphatases in the <i>Archaea</i>
… potential cPTPs have been identified in five archaeal species: <i>Methanobacterium thermoautotrophicum</i>, <i>Methanococcus jannaschii</i>, <i>Thermococcus kodakaraensis</i>, <i>Pyrococcus horikoshii</i>, and <i>S. solfataricus</i>. Only one has been partially characterized, <i>Tk</i>-PTP …
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Mass spectrometric studies of ether lipids in Archaea and sediments
… lipid cores derived from the complex lipids of Archaea. Distinct dissociation pathways during tandem mass spectrometry were noted for the lipid cores, providing information regarding their structure on-line. Analysis of cellular material from species of Methanothermobacter and Sulfolobus …
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Top Down Mass Spectrometry of Archaea and Human Tumor Cells
A final study was performed applying the top down platform to human HeLa tumor cells. Thirty-four proteins in all were identified, and >90% of these were fully characterized. Several proteins harbored post-translational modifications including N-terminal and internal acetylations, methylations, …
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The characterisation of three hyperthermophilic archaea from New Zealand hot springs
Archaea are a unique group of microorganisms that have been isolated from extreme environments such as geothermally active areas, highly saline habitats and extremely acidic sediments. Their capacity to withstand extreme conditions, and even thrive under them, makes them interesting objects of …
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Biochemical and biophysical investigations of N-linked glycosylation pathways in archaea
… is to elucidate the biochemical details of archaeal N-linked glycosylation, specifically through in vitro analysis of the polyprenyl-P-dependent pathway of the methanogenic archaeon Methanococcus voltae. The archaeal OTase, known as AglB, utilizes a-linked dolichyl-P-trisaccharide substrate …
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Discovery and engineering of antiviral defense systems in bacteria and archaea
… and ecology. Most viruses infect bacteria, archaea, and other microbes, and the threat of infection continually challenges microbes' survival. As a consequence of this expansive war, bacteria and archaea have acquired a potent arsenal of molecular defense systems in order to survive. Known …
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Sulfite reductase and thioredoxin in oxidative stress responses of methanogenic archaea
… These obligate anaerobes belonging to the archaeal domain inhabit diverse anoxic environments such as rice paddy fields, human guts, rumen of ruminants, and hydrothermal vents. In these habitats, methanogens are often exposed to O₂ and previous studies have shown that many methanogens are …
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Cell-cell signaling in archaea: How Haloferax volcanii talk to each other
Archaea play crucial roles in global geochemical cycles, have increasing promise for biotechnological applications, and are found in many diverse environments. However, little is known about many fundamental biological processes of archaea, such as their intra- or interspecies communication, …
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Evolution of Transcription in Archaea and the Early-Diverging Eukaryote, Giardia Lamblia
… This thesis analyzes transcription systems in Archaea and Eucarya in an effort to understand the evolution of this fundamental cellular process. Projects span from analyses of the archaeal RNA polymerase to a unique genome survey of transcription components in an early-diverging eukaryote. It …
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