Liquid Phase Electron Microscopy of Bacterial Ultrastructure

Author:

Caffrey Brian J.1ORCID,Pedrazo‐Tardajos Adrián1ORCID,Liberti Emanuela1ORCID,Gaunt Benjamin12ORCID,Kim Judy S.13ORCID,Kirkland Angus I.13ORCID

Affiliation:

1. The Rosalind Franklin Institute Harwell Science and Innovation Campus Didcot OX11 OQX UK

2. Nuffield Department of Women's & Reproductive Health University of Oxford John Radcliffe Hospital Oxford OX3 9DU UK

3. Department of Materials University of Oxford Oxford OX1 3PH UK

Abstract

AbstractRecent advances in liquid phase scanning transmission electron microscopy (LP‐STEM) have enabled the study of dynamic biological processes at nanometer resolutions, paving the way for live‐cell imaging using electron microscopy. However, this technique is often hampered by the inherent thickness of whole cell samples and damage from electron beam irradiation. These restrictions degrade image quality and resolution, impeding biological interpretation. Using graphene encapsulation, scanning transmission electron microscopy (STEM), and energy‐dispersive X‐ray (EDX) spectroscopy to mitigate these issues provides unprecedented levels of intracellular detail in aqueous specimens. This study demonstrates the potential of LP‐STEM to examine and identify internal cellular structures in thick biological samples. Specifically, it highlights the use of LP‐STEM to investigate the radiation resistant, gram‐positive bacterium, Deinococcus radiodurans using various imaging techniques.

Publisher

Wiley

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