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Towards responsible gold supply chains: A case study from Burkina Faso to Switzerland
(2022)Gold is a metal with high direct consumer demand; more than 75% of gold is used for jewellery and investment. Gold is extracted worldwide, including in Burkina Faso, one of Africa's fastest-growing and fourth-largest gold producers. Although gold extraction has had significant benefits for the Burkinabe economy, it has also led to many environmental and social problems, especially in the artisanal gold mining sector. Artisanal gold mining ...Doctoral Thesis -
Structural Studies on Human Telomerase
(2022)Telomerase is a ribonucleoprotein complex, which adds telomeric DNA repeats to chromosome ends to compensate for their loss during genome replication. The catalytic core of the enzyme includes the telomerase reverse transcriptase (TERT) and the non-coding telomerase RNA (TR), which provides the internal template for DNA repeat synthesis. Telomerase is tightly regulated and processive, and in vivo depends on direct interaction with the ...Doctoral Thesis -
Temporal changes in the circumstellar cloud of the interacting binary star R Aqr
(2022)This Master thesis analyzes the inner surrounding region of the binary system R Aquarii (R Aqr), observed using the SPHERE/ZIMPOL instrument at the Very Large Telescope (VLT). On the one hand, the dynamics of the jet outflow is studied by means of Hα observations. It succeeded to trace several gas clouds in four consecutive observations: The innermost southwestern features show a linear increase in velocity as function of their distance, ...Master Thesis -
Developing Multifaceted Approaches to Plant Conservation Planning in the European Alps
(2022)Doctoral Thesis -
Monitoring groundwater infiltration and gas dynamics in the sewer with the portable mass spectrometer "MiniRuedi"
(2022)The extraneous inflows and infiltration, particularly groundwater infiltration, have long been regarded as a primary problem of urban sewer systems. The detection and quantification of groundwater infiltration is the first and crucial step towards the more efficient, cost effective and sustainable sewer rehabilitation and management. The tracer based methods are a promising option to directly differentiate and quantify various water sources ...Master Thesis -
3D Printing of Sacrificial Templates for Hierarchical Porous Materials
(2022)Porosity is an essential structural feature in natural materials, such as wood and bone, where it enables vital tasks from impact absorption to nutrient transport and fracture resistance. Likewise, pores are also key for a broad application range of synthetic materials. Due to their light weight, tunable density and adjustable surface area, porous materials are indispensable for construction, catalysis and tissue engineering. The technical ...Doctoral Thesis -
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The role of ammonia and nitric acid on new particle formation and growth in urban environments
(2022)Aerosols are an important part of the atmosphere, they are defined as liquid or solid particles suspended in air, ranging from one nanometer to tens of micrometers in diameter. Aerosols affect the climate directly, via aerosol radiation interactions, and indirectly, via aerosol-cloud interactions. While pollution in cities does not have the largest impact on global climate, it does affect local climate and weather. Aerosols can also be ...Doctoral Thesis -