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The biotrophic parasite Erysiphe graminis f. sp. hordei produces haustoria within the cells of its host Hordeum vulgare. To determine the physiological activity of these haustoria, the electric potential across the membranes in the mitochondria of the haustorium was studied. The membrane potential was estimated with the fluorescent potentiometric cyanine(More)
  • N Bade, V Beckmann, N G Douglas, P D Barthel, D Engels, L Cordis +2 others
  • 1998
We present a new well defined sample of BL Lac objects selected from the ROSAT All-Sky Survey (RASS). The sample consists of 39 objects with 35 forming a flux limited sample down to f X (0.5 − 2.0 keV) = 8 · 10 −13 ergs cm −2 s −1 , redshifts are known for 33 objects (and 31 of the complete sample). X-ray spectral properties were determined for each object(More)
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