15 research outputs found
Klimabedingte Biodiversitätsveränderungen in limnischen Systemen – eine Diskursfeldanalyse
The Knowledge Flow Paper on hand is linking a problem-oriented discourse field analysis to the broader subject of climatically caused changes of freshwater systems and their biodiversity. This synthesis is a first step towards a better understanding of the impacts of climate change on biodiversity in freshwater systems, which are too little investigated and understood compared to terrestrial ecosystems. Following a brief introduction of the method, the main arenas are being presented and in a second step strands of discourse will be identified. The aim of the analysis is to identify priority issues, key actors and their positions, to distinguish undisputed knowledge of contested knowledge as well as to point out possible future research questions – as formulated by the actors or deduced from analysing contested knowledge. Finally, we will draw conclusions within this field of climatically caused changes of freshwater ecosystems to provide an orientation for a further involvement of the research centre in cross-cutting issues and aims of intervention into the discourse
Biosignature stability in space enables their use for life detection on Mars
Two rover missions to Mars aim to detect biomolecules as a sign of extinct or extant life with, among other instruments, Raman spectrometers. However, there are many unknowns about the stability of Raman-detectable biomolecules in the martian environment, clouding the interpretation of the results. To quantify Raman-detectable biomolecule stability, we exposed seven biomolecules for 469 days to a simulated martian environment outside the International Space Station. Ultraviolet radiation (UVR) strongly changed the Raman spectra signals, but only minor change was observed when samples were shielded from UVR. These findings provide support for Mars mission operations searching for biosignatures in the subsurface. This experiment demonstrates the detectability of biomolecules by Raman spectroscopy in Mars regolith analogs after space exposure and lays the groundwork for a consolidated space-proven database of spectroscopy biosignatures in targeted environments
Biosignature stability in space enables their use for life detection on Mars
Two rover missions to Mars aim to detect biomolecules as a sign of extinct or extant life with, among other instruments, Raman spectrometers. However, there are many unknowns about the stability of Raman-detectable biomolecules in the martian environment, clouding the interpretation of the results. To quantify Raman-detectable biomolecule stability, we exposed seven biomolecules for 469 days to a simulated martian environment outside the International Space Station. Ultraviolet radiation (UVR) strongly changed the Raman spectra signals, but only minor change was observed when samples were shielded from UVR. These findings provide support for Mars mission operations searching for biosignatures in the subsurface. This experiment demonstrates the detectability of biomolecules by Raman spectroscopy in Mars regolith analogs after space exposure and lays the groundwork for a consolidated space-proven database of spectroscopy biosignatures in targeted environments
Pedagogical memory and the space of the postcolonial classroom : reading Dangarembga's Nervous Conditions
This article addresses issues of the mnemonic space of the literature classroom by
interrogating a classic text of African women’s writing, Tsitsi Dangaremnga’s Nervous
Conditions (1988) for the ways it speaks about education in 1960s and 1970s late-colonial
Rhodesia. The article suggests that the novel reviews and critiques a number of memorial
strategies that were crucial to the colonial educational system, thereby facilitating a reflexive
application of the novel’s concerns to the contexts in which it is often taught, that of today’s
postcolonial classrooms. The article seeks to place Dangarembga’s novel in the context of its
present moment, contemporary South Africa – that of the present critic’s site of practice, both
pedagogical and scholarly, and that of many of this article’s readers. This present moment, in
turn, is made up the many sites, successive and simultaneous, in which the novel’s work of
memory is being re-activated in the minds of students as readers and writers. Via a dialogue
between the textual past and the pedagogical present, one which is often subject to critical
amnesia, the article seeks to inaugurate a debate on the nature of pedagogical memory in the
space of the postcolonial university or high school literature classroom.http://www.informaworld.com/RSCRhb2013gv201