Now showing 1 - 10 of 123
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TRACT data quality assessment

2000 , Mohnen, V.A. , Kanter, H.-J. , Slemr, F.

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Erfassung der nassen Deposition

1999 , Gauger, T. , Köble, R. , Smiatek, G.

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Role of ozone in forest decline on Wank mountain (Alps)

1997 , Rennenberg, H. , Polle, A. , Reuther, M.

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Monoterpene and isoprene emission in Norway spruce forests

1997 , Steinbrecher, R. , Ziegler, H. , Eichstädter, G. , Fehsenfeld, R. , Kolb, C. , Rabong, R. , Schönwitz, R. , Schürmann, W.

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Erfassung der Imission

1999 , Köble, R. , Smiatek, G.

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Der natürliche und anthropogene Treibhauseffekt. Veränderung der chemischen Zusammensetzung der Atmosphäre durch menschliche Aktivitäten

1998 , Seiler, W. , Hahn, J.

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Consequences of chronic ozone exposure in transgenic poplars overexpressing enzymes of the glutathione metabolism

1997 , Will, B. , Eiblmeier, M. , Langebartels, C. , Rennenberg, H.

Transgenic poplar trees overexpressing different enzymes of the glutathione metabolism, namely glutathione synthetase, glutathione reductase and gamma-glutamyl-cysteine synthetase (gamma-EC synthetase) were subjected to chronic ozone exposure. After four weeks of fumigation, all lines clearly showed visible damage, compared to controls fumigated with ambient air. However, none of the transgenic lines overexpressing the different enzymes of glutathione metabolism showed enhanced resistance towards ozone. Even the line overexpressing gamma-EC synthetase, which had about 2-fold enhanced glutathione contents, did not show a lower level of damage upon ozone exposure. There was no change in glutathione contents due to ozone fumigation. Apparently, enhanced glutathione content or elevated glutathione reducing capacity does not protect poplar trees from damage derived from chronic ozone exposure. Glutathione does not seem to play a crucial role in detoxifying reactive oxygen species under thes e conditions.

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Critical levels exceedance

1999 , Smiatek, G. , Köble, R.

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Atmosphere - Surface exchange of nitrogen oxides and ozone

1997 , Fowler, D. , Meixner, F.X. , Duyzer, J.H. , Kramm, G. , Granat, L.

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Ground-based measurements of ozone and related precursors at 47 deg N 11 deg E

1997 , Scheel, H.E. , Sladkovic, R. , Seiler, W.