@misc{10481/32289,
year = {2011},
url = {http://hdl.handle.net/10481/32289},
abstract = {Cell‐ghosts  representing  empty  cells  of  the archaeon Sulfolobus acidocaldarius, consisting only of their highly  ordered  and  unusually  stable  outermost proteinaceous  surface  layer  (S‐layer),  were  used  as templates for Au nanoparticles fabrication. The properties 
of  these  archaeal  Au  nanoparticles  differ  significantly from those produced earlier by us onto bacterial S‐layer 
sheets.  The  archaeal  Au  nanoparticles,  with  a  size  of about 2.5 nm, consist exclusively of metallic Au(0), while
those  produced  on  the  bacterial  S‐layer  had  a  size  of about  4  nm  and  represented  a  mixture  of  Au(0)  and 
Au(III) in the ratio of 40 to 60 %.  

The  most  impressive  feature  of  the  archaeal  Au nanoparticles is that they  are  strongly paramagnetic, in contrast  to  the  bacterial  ones  and  also  to  bulk  gold. SQUID  magnetometry  and  XMCD  measurements demonstrated that the archaeal Au nanoparticles possess a rather large magnetic moment of about 0.1μB/atom. HR‐
TEM‐EDX  analysis  revealed  that  the  archaeal  Au nanoparticles are linked to the sulfur atoms of the thiol groups of the amino acid cysteine, characteristic only for 
archaeal S‐layers. This is the first study demonstrating the formation  of  such  unusually  strong  magnetic  Au nanoparticles on a non‐modified archaeal S‐layer.},
organization = {Part of this work was supported by the EU in EuroMagNet II (Grant No. 228043) and Magister (Grant No. NMP3‐LA‐2008‐214685).
Merroun, M.L. is a “Ramón y Cajal Fellow” of the University of Granada. His contribution  was supported by grant No. CGL2009‐09760, 
and those of the Zaragoza group by project
MAT08/1077 of the “Ministerio de Ciencia 
e Innovación”, Spain. This work corresponds
to experiment HE3427 of the ESRF.},
publisher = {InTech Open Access Publisher},
keywords = {Magnetic Au nanoparticles},
keywords = {Archaeal S-layer},
keywords = {High Resolution Transmission Electron Microscopy (HR-TEM)},
keywords = {X-ray Magnetic Circular Dichroism (XMCD)},
title = {Magnetic Au Nanoparticles on Archaeal S-Layer Ghosts as Templates},
doi = {10.5772/50955},
author = {Selenska-Pobell, Sonja and Reitz, Thomas and Schönemann, Rico and Herrmansdörder, Thomas and Merroun, Mohamed Larbi and Geißler, Andrea and Bartolomé, Juan and Bartolomé, Fernando and García, Luis Miguel and Wilhelm, Fabrice and Rogalev, Andrei},
}