Comparative study of a regular protein layer by scanning tunneling microscopy and transmission electron microscopy
作者:
M. Amrein,
Z. Wang,
R. Guckenberger,
期刊:
Journal of Vacuum Science&Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena
(AIP Available online 1991)
卷期:
Volume 9,
issue 2
页码: 1276-1281
ISSN:1071-1023
年代: 1991
DOI:10.1116/1.585220
出版商: American Vacuum Society
关键词: PROTEINS;MONOLAYERS;SURFACE STRUCTURE;IMAGES;SCANNING TUNNELING MICROSCOPY;TRANSMISSION ELECTRON MICROSCOPY;METALS
数据来源: AIP
摘要:
Scanning tunneling microscopy (STM) imaging has been performed on the HPI layer (hexagonally packed intermediate layer), freeze‐dried and coated with Pt–Ir–C. The HPI layer is a highly corrugated regular protein monolayer, found outermost in the cell wall of the bacterium Deinococcus radiodurans. The average structure of each of the two surface aspects of HPI layer has been determined from STM data using correlation averaging. The signal‐to‐noise ratio of the raw data obtained from STM of the HPI layer is in the range of 1.5 to 2, values much higher than those usually encountered in data obtained by transmission electron microscopy (TEM). In order to discuss reliability and accuracy of STM imaging, the reliefs obtained by STM are compared to reconstructed reliefs derived from TEM micrographs of freeze‐dried and metal‐coated specimens.
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