Donat-Peter Häder

Aquatic ecosystems: effects of solar ultraviolet radiation and interactions with other climatic change factors

Aquatic ecosystems are a key component of the Earths biosphere. A large number of studies document substantial impact of solar UV radiation on individual species, yet considerable uncertainty remains with respect to assessing impacts on ecosystems. Several studies indicate that the impact of increased UV radiation appears relatively low when considering overall ecosystem response, while, in contrast, effects on individual species show considerable responses. Ecosystem response to climate variability incorporates both synergistic and antagonistic processes with respect to UV-related effects, significantly complicating understanding and prediction at the ecosystem level. The impact of climate variability on UV-related effects often becomes manifest via indirect effects such as reduction in sea ice, changes in water column bio-optical characteristics, changes in cloud cover and shifts in oceanographic biogeochemical provinces.

Autofluorescence spectroscopy of cells and tissue as a tool for biomedical diagnosis

Several biomolecules involved both in the metabolic processes and in the histological organization of cells and tissues are characterized by fluorescence properties that can be exploited to obtain information on the morpho-functional conditions of the biological substrate, suitable for diagnostic applications. An overview of the endogenous fluorophores responsible for the autofluorescence is given concerning the photophysical properties and their dependence on the evolution of the biological condition of cells and tissues.

Polarized light imaging of tissues

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Part IV: Advancing imaging techniques and novel ultrasensitive fluorescence detection techniques

Part IV Advanced Imaging Techniques and Novel Ultrasensitive Fluorescence Detection Techniques