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Wie interpretieren Kinder nur? : Experimentelle Untersuchungen zum Erwerb von Informationsstruktur
(2010)
Im Zentrum der Arbeit steht die Frage, wie sechsjährige monolingual deutsche Kinder Sätze mit der Fokuspartikel nur interpretieren. In 5 Experimenten wurde untersucht, welchen Einfluss die Oberflächenposition der Fokuspartikel auf das Satzverständnis hat und ob die kontextuelle Einbettung der nur-Sätze zu einer zielsprachlichen Interpretation führt. Im Gegensatz zu den Ergebnissen bisheriger Studien (u.a. Crain, et al. 1994; Paterson et al. 2003) zeigen die Daten der Arbeit, dass die getesteten Kinder die präsentierten nur-Sätze zielsprachlich interpretierten, wenn diese in einen adäquaten Kontext eingebettet waren. Es zeigte sich weiterhin, dass die Kinder mehr Fehler bei der Interpretation von Sätzen mit nur vor dem Subjekt (Nur die Maus hat einen Ball.) als mit nur vor dem Objekt (Die Maus hat nur einen Ball.) machten. Entgegen dem syntaktisch basierten Ansatz von Crain et al. (1994) und dem semantisch-pragmatisch basierten Ansatz von Paterson et al. (2003) werden in der Arbeit informationsstrukturelle Eigenschaften bzw. Unterschiede der nur-Sätze für die beobachteten Leistungen verantwortlich gemacht. Der in der Arbeit postulierte Topik-Default Ansatz nimmt an, dass die Kinder das Subjekt eines Satzes immer als Topik analysieren. Dies führt im Fall der Sätze mit nur vor dem Subjekt zu einer falschen informationsstrukturellen Repräsentation des Satzes. Basierend auf den Ergebnissen der Arbeit und dem postulierten Topik-Default Ansatz wird in der Arbeit abschließend ein Erwerbsmodell für das Verstehen von Sätzen mit der Fokuspartikel nur entworfen und diskutiert.
The widespread usage of products containing volatile organic compounds (VOC) has lead to a general human exposure to these chemicals in work places or homes being suspected to contribute to the growing incidence of environmental diseases. Since the causal molecular mechanisms for the development of these disorders are not completely understood, the overall objective of this thesis was to investigate VOC-mediated molecular effects on human lung cells in vitro at VOC concentrations comparable to exposure scenarios below current occupational limits. Although differential expression of single proteins in response to VOCs has been reported, effects on complex protein networks (proteome) have not been investigated. However, this information is indispensable when trying to ascertain a mechanism for VOC action on the cellular level and establishing preventive strategies. For this study, the alveolar epithelial cell line A549 has been used. This cell line, cultured in a two-phase (air/liquid) model allows the most direct exposure and had been successfully applied for the analysis of inflammatory effects in response to VOCs. Mass spectrometric identification of 266 protein spots provided the first proteomic map of A549 cell line to this extent that may foster future work with this frequently used cellular model. The distribution of three typical air contaminants, monochlorobenzene (CB), styrene and 1,2 dichlorobenzene (1,2-DCB), between gas and liquid phase of the exposure model has been analyzed by gas chromatography. The obtained VOC partitioning was in agreement with available literature data. Subsequently the adapted in vitro system has been successfully employed to characterize the effects of the aromatic compound styrene on the proteome of A549 cells (Chapter 4). Initially, the cell toxicity has been assessed in order to ensure that most of the concentrations used in the following proteomic approach were not cytotoxic. Significant changes in abundance and phosphorylation in the total soluble protein fraction of A549 cells have been detected following styrene exposure. All proteins have been identified using mass spectrometry and the main cellular functions have been assigned. Validation experiments on protein and transcript level confirmed the results of the 2-DE experiments. From the results, two main cellular pathways have been identified that were induced by styrene: the cellular oxidative stress response combined with moderate pro-apoptotic signaling. Measurement of cellular reactive oxygen species (ROS) as well as the styrene-mediated induction of oxidative stress marker proteins confirmed the hypothesis of oxidative stress as the main molecular response mechanism. Finally, adducts of cellular proteins with the reactive styrene metabolite styrene 7,8 oxide (SO) have been identified. Especially the SO-adducts observed at both the reactive centers of thioredoxin reductase 1, which is a key element in the control of the cellular redox state, may be involved in styrene-induced ROS formation and apoptosis. A similar proteomic approach has been carried out with the halobenzenes CB and 1,2-DCB (Chapter 5). In accordance with previous findings, cell toxicity assessment showed enhanced toxicity compared to the one caused by styrene. Significant changes in abundance and phosphorylation of total soluble proteins of A549 cells have been detected following exposure to subtoxic concentrations of CB and 1,2-DCB. All proteins have been identified using mass spectrometry and the main cellular functions have been assigned. As for the styrene experiment, the results indicated two main pathways to be affected in the presence of chlorinated benzenes, cell death signaling and oxidative stress response. The strong induction of pro-apoptotic signaling has been confirmed for both treatments by detection of the cleavage of caspase 3. Likewise, the induction of redox-sensitive protein species could be correlated to an increased cellular level of ROS observed following CB treatment. Finally, common mechanisms in the cellular response to aromatic VOCs have been investigated (Chapter 6). A similar number (4.6-6.9%) of all quantified protein spots showed differential expression (p<0.05) following cell exposure to styrene, CB or 1,2-DCB. However, not more than three protein spots showed significant regulation in the same direction for all three volatile compounds: voltage-dependent anion-selective channel protein 2, peroxiredoxin 1 and elongation factor 2. However, all of these proteins are important molecular targets in stress- and cell death-related signaling pathways.