X-ray damage in protein-metal hybrid structures: a photoemission electron microscopy study.
Bacterial surface layer protein sheets (S layer) coated with an ultrathin cobalt or silver film were studied by means of laterally resolved near-edge X-ray absorption fine structure spectroscopy performed by photoemission electron microscopy. Comparison with results obtained on pristine S layers allowed us to characterize both chemical interaction and X-ray damage in these protein-metal hybrid systems. In particular, we found that besides direct damage upon exposure to X-ray radiation the biomolecules experience additional contribution of the deposited metals, by low-energy electron generation in the metal particles.
Institute of Solid State Physics, Technische Universität Dresden, 01062 Dresden, Germany. andreas.kade@ilkdresden.de
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Kade
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Kummer
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Vyalikh
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Danzenbächer
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Blüher
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Mertig
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Lanzara
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Scholl
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Doran
Serguei L
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Molodtsov
D003035:Cobalt / Q000737:chemistry*; D011506:Proteins / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D056928:X-Ray Absorption Spectroscopy; D014965:X-Rays
D011506:Proteins; D003035:Cobalt; D012834:Silver