TY - JOUR A1 - Eilmann, Britta A1 - Buchmann, Nina A1 - Siegwolf, Rolf A1 - Saurer, Matthias A1 - Cherubini, Paolo A1 - Rigling, Andreas T1 - Fast response of Scots pine to improved water availability reflected in tree-ring width and δ13C JF - Plant, Cell and Environment N2 - Drought-induced forest decline, like the Scots pine mortality in inner-Alpine valleys, will gain in importance as the frequency and severity of drought events are expected to increase. To understand how chronic drought affects tree growth and tree-ring δ13C values, we studied mature Scots pine in an irrigation experiment in an inner-Alpine valley. Tree growth and isotope analyses were carried out at the annual and seasonal scale. At the seasonal scale, maximum δ13C values were measured after the hottest and driest period of the year, and were associated with decreasing growth rates. Inter-annual δ13C values in early- and latewood showed a strong correlation with annual climatic conditions and an immediate decrease as a response to irrigation. This indicates a tight coupling between wood formation and the freshly produced assimilates for trees exposed to chronic drought. This rapid appearance of the isotopic signal is a strong indication for an immediate and direct transfer of newly synthesized assimilates for biomass production. The fast appearance and the distinct isotopic signal suggest a low availability of old stored carbohydrates. If this was a sign for C-storage depletion, an increasing mortality could be expected when stressors increase the need for carbohydrate for defence, repair or regeneration. Y1 - 2010 U6 - https://doi.org/10.1111/j.1365-3040.2010.02153.x SN - 1365-3040 (Online) SN - 0140-7791 (Print) VL - 33 IS - 8 SP - 1351 EP - 1360 PB - Wiley-Blackwell CY - Oxford ER - TY - JOUR A1 - Kalbe, Jochen A1 - Kuropka, Rolf A1 - Meyer-Stork, L. Sebastian A1 - Berndt, Heinz A1 - [u.a.], T1 - Isolation and characterization of high-molecular mass DNA from hair shafts JF - Biological chemistry Y1 - 1988 SN - 0177-3593 U6 - https://doi.org/10.1515/bchm3.1988.369.1.413 VL - 369 IS - 1 SP - 413 EP - 416 ER - TY - JOUR A1 - Fonti, Patrick A1 - von Arx, Georg A1 - García-González, Ignacio A1 - Eilmann, Britta A1 - Sass-Klaassen, Ute G. W. A1 - Gärtner, Holger A1 - Eckstein, Dieter T1 - Studying global change through investigation of the plastic responses of xylem anatomy in tree rings JF - New Phytologist N2 - Variability in xylem anatomy is of interest to plant scientists because of the role water transport plays in plant performance and survival. Insights into plant adjustments to changing environmental conditions have mainly been obtained through structural and functional comparative studies between taxa or within taxa on contrasting sites or along environmental gradients. Yet, a gap exists regarding the study of hydraulic adjustments in response to environmental changes over the lifetimes of plants. In trees, dated tree-ring series are often exploited to reconstruct dynamics in ecological conditions, and recent work in which wood-anatomical variables have been used in dendrochronology has produced promising results. Environmental signals identified in water-conducting cells carry novel information reflecting changes in regional conditions and are mostly related to short, sub-annual intervals. Although the idea of investigating environmental signals through wood anatomical time series goes back to the 1960s, it is only recently that low-cost computerized image-analysis systems have enabled increased scientific output in this field. We believe that the study of tree-ring anatomy is emerging as a promising approach in tree biology and climate change research, particularly if complemented by physiological and ecological studies. This contribution presents the rationale, the potential, and the methodological challenges of this innovative approach. Y1 - 2010 U6 - https://doi.org/10.1111/j.1469-8137.2009.03030.x SN - 1469-8137 (Online) SN - 0028-646X (Print) VL - 185 IS - 1 SP - 42 EP - 53 PB - Wiley-Blackwell CY - Oxford ER - TY - JOUR A1 - Berndt, Heinz A1 - Krüger, Götz T1 - Resolution of enantiomeric amino acid derivatives by high-performance liquid chromatography on chiral stationary phases JF - Journal of chromatography A Y1 - 1985 U6 - https://doi.org/10.1016/S0021-9673(01)92461-6 SN - 0021-9673 VL - 1985 IS - 348 SP - 275 EP - 279 ER - TY - JOUR A1 - Köllensperger, P. A1 - Bragard, Michael A1 - Plum, T. A1 - De Doncker, R. W. T1 - The dual GCT : new high-power device using optimized GCT technology JF - IEEE transactions on industry applications Y1 - 2009 U6 - https://doi.org/10.1109/TIA.2009.2027364 SN - 0093-9994 VL - 45 IS - 5 SP - 1754 EP - 1762 ER - TY - JOUR A1 - Anik, Sabri A1 - Frohberg, Martin G. T1 - Investigation of the thermodynamics of oxygen and the determination of phase boundaries in the system copper-oxygen-bismuth at 12000C JF - Zeitschrift für Metallkunde Y1 - 1983 SN - 0044-3093 VL - 74 IS - 8 SP - 530 EP - 534 ER - TY - JOUR A1 - Anik, Sabri A1 - Frohberg, Martin G. T1 - Thermodynamics of oxygen in the copper-antimony system at 1473K JF - Erzmetall : Rohstoffgewinnung, Verarbeitung, Recycling, Umwelttechnik Y1 - 1988 SN - 0044-2658 VL - 41 IS - 10 SP - 498 EP - 501 ER - TY - JOUR A1 - Rigling, Andreas A1 - Eilmann, Britta A1 - Koechli, Roger A1 - Dobbertin, Matthias T1 - Mistletoe-induced crown degradation in Scots pine in a xeric environment N2 - Increasing Scots pine (Pinus sylvestris L.) mortality has been recently observed in the dry inner valleys of the European Alps. Besides drought, infection with pine mistletoe (Viscum album ssp. austriacum) seems to play an important role in the mortality dynamics of Scots pines, but how mistletoes promote pine decline remains unclear. To verify whether pine mistletoe infection weakens the host via crown degradation, as observed for dwarf mistletoes, we studied the negative effects of pine mistletoe infestation on the photosynthetic tissues and branch growth of pairs of infested and non-infested branches. Pine mistletoe infection leads to crown degradation in its host by reducing the length, the radial increment, the ramification, the needle length and the number of needle years of the infested branches. This massive loss in photosynthetic tissue results in a reduction in primary production and a subsequent decrease in carbohydrate availability. The significant reduction in needle length due to mistletoe infection is an indication for a lower water and nutrient availability in infested branches. Thus, mistletoe infection might lead to a decrease in the availability of water and carbohydrates, the two most important growth factors, which are already shortened due to the chronic drought situation in the area. Therefore, pine mistletoe increases the risk of drought-induced mortality of its host when growing in a xeric environment. Y1 - 2010 U6 - https://doi.org/10.1093/treephys/tpq038 SN - 1758-4469 (Online) SN - 0829-318X (Print) VL - 30 IS - 7 SP - 845 EP - 832 PB - Oxford University Press CY - Oxford ER - TY - JOUR A1 - Eilmann, Britta A1 - Weber, Pascale A1 - Rigling, Andreas A1 - Eckstein, Dieter T1 - Growth reactions of Pinus sylvestris L. and Quercus pubescens Willd. to drought years at a xeric site in Valais, Switzerland JF - Dendrochronologia Y1 - 2006 U6 - https://doi.org/doi:10.1016/j.dendro.2005.10.002 SN - 1612-0051 (Online) SN - 1125-7865 (Print) VL - 23 IS - 3 SP - 121 EP - 132 ER - TY - JOUR A1 - Kuropka, Rolf A1 - Müller, Bettina A1 - Höcker, Hartwig A1 - Berndt, Heinz T1 - Chiral stationary phases via hydrosilylation reaction of N-acryloylamino acids : I. Stationary phase with one chiral centre for high-performance liquid chromatography and development of a new derivatization pattern for amino acid enantiomers JF - Journal of chromatography A Y1 - 1989 SN - 0021-9673 IS - 481 SP - 380 EP - 386 ER - TY - JOUR A1 - Nokihara, Kiyoshi A1 - Berndt, Heinz T1 - Studies on sulfur-containing peptides : tert-butyloxycarbonylsulfenyl and benzyloxycarbonylsulfenyl derivatives as protecting groups for cysteine JF - The journal of organic chemistry Y1 - 1978 U6 - https://doi.org/10.1021/jo00419a046 SN - 0022-3263 VL - 43 IS - 25 SP - 4893 EP - 4895 PB - American Chemical Society CY - Washington ER - TY - JOUR A1 - Kalbe, Jochen A1 - Höcker, Hartwig A1 - Berndt, Heinz T1 - Design of enzyme reactors as chromatographic columns for racemic resolution of amino acid esters JF - Chromatographia Y1 - 1989 SN - 0009-5893 U6 - https://doi.org/10.1007/BF02319646 VL - 28 IS - 3-4 SP - 193 EP - 196 ER - TY - JOUR A1 - Porschen, W. A1 - Gartzen, J. A1 - Gewehr, K. A1 - Mühlensiepen, H. A1 - Weber, Hans-Joachim A1 - Feinedegen, L E. T1 - In vivo assay of the radiation sensitivity of hypoxic tumour cells : influence of γ-rays, cyclotron neutrons, misonidazole, hyperthermia and mixed modalities JF - The British journal of cancer / Supplement N2 - Tumour cell death can be evaluated in the living mouse by externally measuring the rate of loss of tumour-bound DNA tracer. By sequentially labelling the tumour-bearing animals with ¹²⁵IUdR and ¹³¹IUdR 50 h apart, the average tumour cells at the time of the second injection are labelled by ¹²⁵IUdR and the euoxic tumour cells are specifically labelled with ¹³¹IUdR. Tumour treatment at this stage of labelling permits the observation of the reaction of euoxic cells and average tumour cells and finally yields data on hypoxic cells and thus on the oxygen enhancement ratio. This information adds to results from tumour control and growth delay. With this technique effects were analysed of 60-Co γ-rays, cyclotron neutrons (E = 6 MeV), misonidazole (500 mg/kg body wt) and hyperthermia (42°C water-bath), or combinations of these. Misonidazole (15 min before irradiation) altered the oxygen enhancement ratio by a factor of 1·5 for γ-rays and of 1·1 for neutrons; when evaluated from tumour-growth delay and TCD-50 misonidazole gave a dose modifying factor of 1·47 for γ-rays and of 1·2-1·3 for neutrons. Based on percentage tumour regression 100 days after treatment, the enhancement ratio from hyperthermia (after irradiation) was 2·75 for γ-rays (at 10 Gray) and 2·2 for neutrons (at 3·2 Gray). For neutrons combined with misonidazole and hyperthermia the ratio was 2·4. These results demonstrate that effects of neutron irradiation may be modified by electron-affinic substances and/or hyperthermia. Y1 - 1978 SN - 0306-9443 N1 - Section 6: Sensitization and Hypoxic Cytotoxicity: Effects of Hyperthermia and High Let IS - 3 SP - 194 EP - 197 PB - Lewis CY - London ER -