Barbara Koehler

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In Arabidopsis thaliana, the family of cyclic nucleotide-gated channels (CNGCs) is composed of 20 members. Previous studies indicate that plant CNGCs are involved in the control of growth processes and responses to abiotic and biotic stresses. According to their proposed function as cation entry pathways these channels contribute to cellular cation(More)
The Bcl-2 homology 3-only protein Bid is an important mediator of death receptor-induced apoptosis. Recent reports and this study suggest that Bid may also mediate genotoxic drug-induced apoptosis of various human cancer cells. Here, we characterized the role of Bid and the mechanism of Bid activation during oxaliplatin-induced apoptosis of HeLa cervical(More)
We report here that NO(3)(-) in the xylem exerts positive feedback on its loading into the xylem through a change in the voltage dependence of the Quickly Activating Anion Conductance, X-QUAC. Properties of this conductance were investigated on xylem-parenchyma protoplasts prepared from roots of Hordeum vulgare by applying the patch-clamp technique. Chord(More)
Management is necessary for the conservation of limestone grasslands. However, the traditional management of hay-making every year in July is no longer profitable for farmers. Hence many species-rich grasslands have become abandoned. The aim of this study is (a) to investigate the consequences of abandonment (as compared with annual mowing) on the(More)
BACKGROUND The BH3-only protein Bid is an important component of death receptor-mediated caspase activation. Bid is cleaved by caspase-8 or -10 into t-Bid, which translocates to mitochondria and triggers the release of caspase-activating factors. Bid has also been reported to be cleaved by other proteases. METHODOLOGY/PRINCIPAL FINDINGS To test the(More)
Es wird eine reflektorisch auf elektrischen Reiz an den Extremitätenenden entstehende Hemmung in der Willkürinnervation von Beugemuskeln an normalen Menschen unter Verwendung elektrophysiologischer Methodik beschrieben, mit genauer Schilderung der dabei auftretenden Effekte. Die Hemmung wird verglichen mit dem Hemmungsreflex in den Streckern (Beugereflex am(More)
Primary mouse epidermal cells underwent spontaneous ma lignant transformation in culture. Twelve malignant epidermal cell lines were established which produced squamous cell carcinomas in syngeneic hosts. These lines were used to define criteria for recognizing transformed epidermal cells in vitro. Growth in suspension in agar, agarose, or Methocel was mini(More)
Proton pumps produce electrical potential differences and differences in pH across the plasma membrane of cells which drive secondary ion transport through sym- and antiporters. We used the patch-clamp technique to characterize an H(+)-pump in the xylem parenchyma of barley roots. This cell type is of special interest with respect to xylem loading. Since it(More)
1. Der an der Hemmung der Strecker nachgewiesene Beugereflex hat ein zur Haut gehöriges Ursprungsfeld. 2. Die Ausdehnung dieses Feldes umfaßt am Arm ein Gebiet, das von der Hand bis zum Ellenbogen reicht. Am Bein endet das receptive Feld in Höhe des Kniegelenks. Die focale Zone umfaßt Hand und Fuß. 3. Durch Ausschaltung der Hautsensibilität wird das(More)