Refine
Year of publication
- 2013 (2628) (remove)
Document Type
- Article (993)
- Part of Periodical (403)
- Book (221)
- Contribution to a Periodical (183)
- Working Paper (162)
- Doctoral Thesis (152)
- Review (143)
- Part of a Book (114)
- Report (110)
- Conference Proceeding (89)
Language
- German (1380)
- English (1114)
- Portuguese (34)
- Croatian (29)
- French (25)
- Multiple languages (15)
- Turkish (15)
- Spanish (8)
- Italian (6)
- Hebrew (1)
Is part of the Bibliography
- no (2628) (remove)
Keywords
- Deutsch (70)
- Germanistik (40)
- Theorie (34)
- Bologna-Prozess (32)
- Exzellenzinitiative (32)
- Literatur (32)
- Zukunft (32)
- Video (19)
- Deutsch als Fremdsprache (18)
- taxonomy (18)
Institute
- Präsidium (309)
- Medizin (285)
- Gesellschaftswissenschaften (177)
- Wirtschaftswissenschaften (107)
- Physik (101)
- Biowissenschaften (92)
- Center for Financial Studies (CFS) (89)
- Exzellenzcluster Die Herausbildung normativer Ordnungen (89)
- Geschichtswissenschaften (81)
- Biochemie und Chemie (63)
Before turning to the essay on the experiment from 1793, which is unavoidable when discussing series, but does not exhaust the varied functions of seriality in Goethe’s morphology, a few words about the purpose of reconstructing Goethe’s practice of seriality are necessary. I want to argue that Goethe’s morphology is the site of a massive transformation of the notion of form, the scope and implications of which resurface after long latency at the beginning of the 20th century, for example, with Georg Simmel’s sociological notion of form-processes and the related idea of "reciprocity" ('Wechselwirkung') (cf. 265). My interest lies in interpreting what looks like a theory of organisms and nature as a more general theory of formation and transformation.
The antibacterial properties of nanosilver have led to a versatile application spectrum including medical purposes and personal care products. However, the increasing use of nanosilver has raised concerns about its environmental impacts. Long-term exposure studies with aquatic invertebrates are essential to assess possible adverse effects on aquatic ecosystems. In the present study, acute (48 h), chronic (21 d) and long-term effects of nanosilver (primary size 15 nm) on five successive generations of three Daphnia species (D. magna, D. pulex, and D. galeata) were investigated. Acute EC50 values of nanosilver were 121 µg Ag L−1 for D. magna being the least sensitive species and 8.95 and 13.9 µg Ag L−1 for D. pulex and D. galeata, respectively. Chronic exposure provided EC10 values of 0.92 µg Ag L−1 for D. magna showing the most sensitive chronic reaction and 2.25 and 3.45 µg Ag L−1 for D. pulex and D. galeata, respectively. Comparative exposure to AgNO3 revealed a generally higher toxicity of the soluble form of silver. The multi-generation experiments resulted in effects on the population level for all tested species. Exposure of D. magna indicated an increased toxicity of nanosilver in the fifth generation of animals exposed to 10 µg Ag L−1. Neonates from pre-exposed parental daphnids did not completely recover when transferred into clean water. Exposure of D. pulex and D. galeata revealed not only increasing toxicity in some generations, but also greater tolerance to nanosilver. This study contributes to the assessment of the risk potential of nanosilver on aquatic ecosystems. It shows that effects of nanosilver vary within one genus and change with exposure duration. Therefore, long-term studies considering different aquatic species are needed to better understand the possible effects of nanosilver on aquatic ecosystems.
The present study investigates the hemispheric contributions of neuronal reorganization following early single-sided hearing (unilateral deafness). The experiments were performed on ten cats from our colony of deaf white cats. Two were identified in early hearing screening as unilaterally congenitally deaf. The remaining eight were bilaterally congenitally deaf, unilaterally implanted at different ages with a cochlear implant. Implanted animals were chronically stimulated using a single-channel portable signal processor for two to five months. Microelectrode recordings were performed at the primary auditory cortex under stimulation at the hearing and deaf ear with bilateral cochlear implants. Local field potentials (LFPs) were compared at the cortex ipsilateral and contralateral to the hearing ear. The focus of the study was on the morphology and the onset latency of the LFPs. With respect to morphology of LFPs, pronounced hemisphere-specific effects were observed. Morphology of amplitude-normalized LFPs for stimulation of the deaf and the hearing ear was similar for responses recorded at the same hemisphere. However, when comparisons were performed between the hemispheres, the morphology was more dissimilar even though the same ear was stimulated. This demonstrates hemispheric specificity of some cortical adaptations irrespective of the ear stimulated. The results suggest a specific adaptation process at the hemisphere ipsilateral to the hearing ear, involving specific (down-regulated inhibitory) mechanisms not found in the contralateral hemisphere. Finally, onset latencies revealed that the sensitive period for the cortex ipsilateral to the hearing ear is shorter than that for the contralateral cortex. Unilateral hearing experience leads to a functionally-asymmetric brain with different neuronal reorganizations and different sensitive periods involved.
Pseudomorphose
(2013)
Der Sprachgebrauch verleitet dazu, Pseudomorphosen als bloß täuschenden Anschein jenes Gestaltwandels zu verstehen, der sich in (echten) Metamorphosen vollzieht. Dort tut sich tatsächlich etwas, aber die Pseudomorphose tut nur so, als ob. Allerdings zeigt schon die echte Metamorphose, der das Christentum nach Blumenberg den Garaus macht, auch beim alten Heiden Goethe noch oder schon pseudomorphotische Züge. Wenn alles Blatt ist, darf man legitimerweise fragen, ob da überhaupt etwas metamorphorisiert. Als Metapher geht die Pseudomorphose auf Oswald Spengler zurück, der sie der für historische Sedimentierungs- und Verwerfungsprozesse seit dem 19. Jahrhundert so ertragreichen Mineralogie entlehnt hat.