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 10 of 10 for “"emergence of life"”.
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EXOCOMETS AT LARGE ORBITAL RADII AND THEIR INWARD TRANSPORT IN DEBRIS DISCS
Planetary systems are not only composed of planets, but also of km-sized rocky and icy bodies that are confined within belts similar to the Asteroid and Kuiper belt in the Solar System. Mutual collisions within these belts grind down solids producing dust and giving rise to debris discs. Primitive …
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Deformation of icy moons induced by heat flux variations from the ocean
Title: Deformation of icy moons induced by heat flux variations from the ocean Author: Martin Kihoulou Department: Department of Geophysics Laboratoire de Planétologie et Géosciences Supervisor: Prof. RNDr. Ondřej Čadek, CSc., Department of Geophysics Dr. Gaël Choblet, Laboratoire de Planétologie …
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Life cycle of a common weed : reciprocity, anxiety and the aesthetics of noncatharsis
This document is a condensation of research into an artistic practice of transation and dialogue. Through the staging of an artwork, I offer encounters with fractured biopolitics and forms of social engagement. Written in three parts, this document may be read as separate yet interdependent …
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Laboratory and field-based investigations of subsurface geochemical processes in seafloor hydrothermal systems
This thesis presents the results of four discrete investigations into processes governing the organic and inorganic chemical composition of seafloor hydrothermal fluids in a variety of geologic settings. Though Chapters 2 through 5 of this thesis are disparate in focus, each represents a novel …
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Laboratory and field-based investigations of subsurface geochemical processes in seafloor hydrothermal systems
This thesis presents the results of four discrete investigations into processes governing the organic and inorganic chemical composition of seafloor hydrothermal fluids in a variety of geologic settings. Though Chapters 2 through 5 of this thesis are disparate in focus, each represents a novel …
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The structural basis of RNA-catalyzed RNA polymerization
… chemically identical to a single turnover of RNA-dependent RNA polymerization. Such an activity would have been requisite for the emergence of a self-replicase ribozyme, an enzyme that, according to the RNA World hypothesis, would be fundamental for the emergence of life. Demonstrating the …
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The Conditions of Emergence: Towards a Feminist Philosophy of The Origins of Life
<p>This dissertation explores the limits of feminist theory in terms of what questions it can address, and does this by reimagining the relation feminist theory and late nineteenth and twentieth-century continental thought can have with scientific research concerning the origins of life. I argue …
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Late accretion to the early Earth and rocky exoplanets
The final stages of Earth's formation were characterised by the violent collisions of planetesimals, asteroids and comets -- by-products of the primary stage of planet formation -- with the nascent planet. It is thought these impacts, delivering vast sums of energy, may have transformed surface …
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TIMELESS QUESTIONS AND MODERN CHALLENGES: A JOURNEY FROM THE ORIGIN OF LIFE IN HYDROTHERMAL VENTS TO ELECTROCHEMICAL CO2 REDUCTION
The objective of the work presented here is to investigate the functioning of the alkaline hydrothermal vent from an electrochemical point of view in order to inspire new technologies for CO2 reduction. Oceanic hydrothermal vents (HTVs) are geological structures that played a key role 4 billion …
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Phosphorus Pathways In Deep Time
Some of the most fundamental questions in natural science ask about the nature of early Earth. The conditions under which Earth formed and life emerged on its surface are especially uncertain. However, we are left with precious little evidence to study: most sufficiently ancient terrestrial rocks …