Document Detail

Force volume and stiffness tomography investigation on the dynamics of stiff material under bacterial membranes.
MedLine Citation:
PMID:  22528189     Owner:  NLM     Status:  In-Data-Review    
The determination of the characteristics of micro-organisms in clinical specimens is essential for the rapid diagnosis and treatment of infections. A thorough investigation of the nanoscale properties of bacteria can prove to be a fundamental tool. Indeed, in the latest years, the importance of high resolution analysis of the properties of microbial cell surfaces has been increasingly recognized. Among the techniques available to observe at high resolution specific properties of microscopic samples, the Atomic Force Microscope (AFM) is the most widely used instrument capable to perform morphological and mechanical characterizations of living biological systems. Indeed, AFM can routinely study single cells in physiological conditions and can determine their mechanical properties with a nanometric resolution. Such analyses, coupled with high resolution investigation of their morphological properties, are increasingly used to characterize the state of single cells. In this work, we exploit the capabilities and peculiarities of AFM to analyze the mechanical properties of Escherichia coli in order to evidence with a high spatial resolution the mechanical properties of its structure. In particular, we will show that the bacterial membrane is not mechanically uniform, but contains stiffer areas. The force volume investigations presented in this work evidence for the first time the presence and dynamics of such structures. Such information is also coupled with a novel stiffness tomography technique, suggesting the presence of stiffer structures present underneath the membrane layer that could be associated with bacterial nucleoids. Copyright © 2012 John Wiley & Sons, Ltd.
Giovanni Longo; Laura Marques Rio; Charles Roduit; Andrej Trampuz; Alain Bizzini; Giovanni Dietler; Sandor Kasas
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of molecular recognition : JMR     Volume:  25     ISSN:  1099-1352     ISO Abbreviation:  J. Mol. Recognit.     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-04-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9004580     Medline TA:  J Mol Recognit     Country:  England    
Other Details:
Languages:  eng     Pagination:  278-84     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 John Wiley & Sons, Ltd.
Laboratory of Physics of Living Matter, EPFL, Lausanne, Switzerland.
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