Regensburg 2007 – scientific programme

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BP: Fachverband Biologische Physik

BP 26: Poster Session II

BP 26.3: Poster

Thursday, March 29, 2007, 17:00–19:30, Poster B

X-ray radiation-damage studies of regular bacterial surface layers — •Andreas Kade — TU-Dresden, Dresden, Deutschland

We report x-ray radiation-damage investigation of the regular surface layer of Bacillus sphaericus NCTC 9602 using a photoemission electron microscope. The purpose of this work is to provide current perspectives on spectroscopic studies of the simplest biomembranes existing in nature. Here, measurements show the decrease in the C-O and C-N bond density as measured by near-edge x-ray absorption fine structure spectroscopy at the C 1s, N 1s and O 1s excitation thresholds. We found the critical dose for C-O and C-N breaking. The increase in the C-C bond density corresponds to the damage of the other bonds. Furthermore we show the rearrangement of the bond constituents after the radiation damage.