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Nanoscale Imaging of Whole Cells Using a Liquid Enclosure and a Scanning Transmission Electron Microscope

Journal Article · · PLoS ONE
 [1];  [2];  [3];  [4]
  1. University of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); DOE/OSTI
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  3. University of Tennessee, Knoxville, TN (United States)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States; Vanderbilt University, Nashville, TN (United States)
Nanoscale imaging techniques are needed to investigate cellular function at the level of individual proteins and to study the interaction of nanomaterials with biological systems. We imaged whole fixed cells in liquid state with a scanning transmission electron microscope (STEM) using a micrometer-sized liquid enclosure with electron transparent windows providing a wet specimen environment. Wet-STEM images were obtained of fixed E. coli bacteria labeled with gold nanoparticles attached to surface membrane proteins. Mammalian cells (COS7) were incubated with gold-tagged epidermal growth factor and fixed. STEM imaging of these cells resulted in a resolution of 3 nm for the gold nanoparticles. The wetSTEM method has several advantages over conventional imaging techniques. Most important is the capability to image whole fixed cells in a wet environment with nanometer resolution, which can be used, e.g., to map individual protein distributions in/on whole cells. The sample preparation is compatible with that used for fluorescent microscopy on fixed cells for experiments involving nanoparticles. Thirdly, the system is rather simple and involves only minimal new equipment in an electron microscopy (EM) laboratory.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES); Vanderbilt University Medical Center
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1627391
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 12 Vol. 4; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Simultaneous Correlative Light and Electron Microscopy of Samples in Liquid text January 2014
In Situ Environmental TEM in Imaging Gas and Liquid Phase Chemical Reactions for Materials Research journal September 2016
In Situ Transmission Electron Microscopy on Energy‐Related Catalysis journal December 2019
Considerations for imaging thick, low contrast, and beam sensitive samples with liquid cell transmission electron microscopy journal February 2019
Investigating materials formation with liquid-phase and cryogenic TEM journal June 2016
Electron microscopy of specimens in liquid journal October 2011
Resolution and aberration correction in liquid cell transmission electron microscopy journal December 2018
Imaging of soft materials using in situ liquid-cell transmission electron microscopy journal January 2019
Preliminary research on imaging in MEMS electron microscope journal December 2019
High flow rate nanofluidics for in-liquid electron microscopy and diffraction journal July 2019
Enabling direct nanoscale observations of biological reactions with dynamic TEM journal January 2013
Liquid electron microscopy: then, now and future journal October 2019
Resolution and aberration correction in liquid cell transmission electron microscopy collection January 2018

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