A5076217434- Atmospheric chemistry and aerosols
- Methane Hydrates and Related Phenomena
- Atmospheric Ozone and Climate
- nanoparticles nucleation surface interactions
- Winter Sports Injuries and Performance
- Arctic and Antarctic ice dynamics
- Turfgrass Adaptation and Management
- Cryospheric studies and observations
- Atmospheric aerosols and clouds
- Microbial Community Ecology and Physiology
- Muscle metabolism and nutrition
- Marine and coastal ecosystems
- Indoor Air Quality and Microbial Exposure
- Vehicle emissions and performance
- Freezing and Crystallization Processes
- Nonlinear Optical Materials Research
- Nuclear Physics and Applications
- Astrophysics and Star Formation Studies
- Crystallography and molecular interactions
- Quantum, superfluid, helium dynamics
- Plant responses to elevated CO2
- Icing and De-icing Technologies
- Plant Pathogenic Bacteria Studies
- Adsorption, diffusion, and thermodynamic properties of materials
- Material Dynamics and Properties
TU Wien
2011-2023
Universität Innsbruck
2016
Abstract. Mineral dust particles from deserts are amongst the most common ice nucleating in atmosphere. The mineralogy of desert differs depending on source region and can further fractionate during emission processes. Mineralogy to a large extent explains nucleation behavior aerosol, but not entirely. Apart pure mineral dust, aerosol often exhibit coating or mixed with small amounts biological material. Aging ground atmospheric transport deactivate sites, thus strong minerals may their full...
Abstract. Birch pollen are known to release ice-nucleating macromolecules (INM), but little is about the production and of INM from other parts tree. We examined ice nucleation activity samples 10 different birch trees (Betula spp.). Samples were taken nine in Tyrol, Austria, one tree a small urban park Vienna, Austria. Filtered aqueous extracts 30 leaves, primary wood (new branch wood, green colour, photosynthetically active), secondary (older brown with no photosynthetic activity) analysed...
New tools and technology are needed to study microorganisms in freshwater environments. Little is known about spatial distribution ice nucleation activity (INA) of lakes. We developed a system collect water samples from the surface lakes using 3D-printed sampling device tethered drone (DOWSE, DrOne Water Sampling SystEm). The DOWSE was used at different distances shore (1, 25, 50 m) eight Austria June 2018. were filtered, cultured on two media types, TSA (a general growth medium) KBC medium...
Abstract The composition of high‐altitude ice clouds is still a matter intense discussion. constituents in question are and nitric acid hydrates, but the exact phase its formation mechanisms unknown. In this work, conclusive evidence for long‐predicted phase, alpha‐nitric trihydrate (alpha‐NAT), presented. This was characterized by combination X‐ray neutron diffraction experiments, allowing convincing structure solution. Furthermore, vibrational spectra (infrared inelastic scattering) were...
Here we investigate the freezing and thawing properties of aqueous solutions in oil emulsions, with a particular focus on investigating influence surfactant stirring time emulsion. Specifically, employ optical cryomicroscopy combination differential scanning calorimetry to study phase behavior emulsified 25 wt. % ammonium sulfate droplets temperature range down 93 K. We conclude that nucleation does not vary oil-surfactant combination, is, homogeneous is probed. However, incomplete...
Artificial snow production is a crucial part of modern skiing resorts in Austria and globally, will develop even more so with changing precipitation patterns warming climate trend. Producing artificial requires major investments energy, water, infrastructure manpower for resorts. In addition to appropriate meteorological conditions, the efficiency depends on heterogeneous ice-nucleation, which can occur at temperatures as high -2 °C when induced by specific bacterial ice nucleating particles...
Heterogeneous ice nucleation plays an important role in many environmental processes such as cloud formation, freezing of water bodies or biological freeze protection the cryosphere. New information is needed about seasonal availability, nature, and activity nucleating particles (INPs) alpine environments. These INPs trigger phase transition from liquid to solid at elevated subzero temperatures. We collected samples a series rivers lakes (two valleys their rivers, artificial pond, natural...
Vibrational spectroscopy, X-ray diffraction, and electron microscopy have been applied to investigate the crystallization of concentrated amorphous nitric acid (0.5 ≤ x 0.95). Crystalline monohydrate (HNO3 · H2O) is major hydrate phase detected together with traces metastable dihydrate 2H2O) pure crystalline acid. Nitric tetratohydrate (4HNO3 was not achievable. The diffraction data show as a highly symmetrical structure, which bestows clearly laid out infrared, Raman inelastic neutron...
Abstract. Birch pollen are known to release ice-nucleating macromolecules (INM), but little is about the production and of INM from other tissues tree. We examined ice nucleation activity ten different birch trees (Betula spp.). Samples were taken nine in Tyrol, Austria, one tree a small urban park Vienna, Austria. Filtered aqueous extracts 30 samples leaves, primary wood (new branch wood, green colour, photosynthetically active), secondary (older branch, brown with no photosynthetic...
Abstract Die Zusammensetzung von hochliegenden Eiswolken ist ein intensiv diskutierter Gegenstand der aktuellen Forschung. Bildungsmechanismen und die genaue Phasenzusammensetzung sind, nicht zuletzt aufgrund schwierigen Zugänglichkeit, noch endgültig aufgeklärt. Hier wird eine lange vermutete, aber strukturell unbekannte Phase vorgestellt. Diese alpha‐Salpetersäuretrihydrat (alpha‐NAT), metastabile NAT. Mittels Röntgen‐ Neutronendiffraktionsexperimenten wurde analysiert daraus schlüssige...
Atmosphärenchemie Die Struktur von Salpetersäuretrihydrat, die H. Grothe et al. in ihrer Zuschrift auf S. 3334 ff. beschreiben, liefert Informationen über frühen Stadien der Eiswolkenbildung Stratosphäre und oberen Troposphäre.
Abstract In the frame of determining exact phase composition stratospheric clouds and its formation mechanisms, evidence for predicted metastable α‐HNO 3 ·3H 2 O (alpha‐NAT) is presented.
Bacteria from the Pseudomonas syringae complex (comprised of at least 15 recognized species and more than 60 different pathovars P. sensu stricto) have been cultured clouds, rain, snow, streams, rivers, lakes. Some strains express an ice nucleation protein (hereafter referred to as ice+) that catalyzes heterogeneous freezing water. Though has sampled intensively freshwater sources in U.S. France, little is known about genetic diversity activity other parts world. We investigated haplotype -8...