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  • center
  • program_project
  • nrc
  • whocc
  • project
  • software
  • tool
  • patent
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  • Assistant Professor
  • Associate Professor
  • Clinical Research Assistant
  • Clinical Research Nurse
  • Clinician Researcher
  • Department Manager
  • Dual-education Student
  • Full Professor
  • Honorary Professor
  • Lab assistant
  • Master Student
  • Non-permanent Researcher
  • Nursing Staff
  • Permanent Researcher
  • Pharmacist
  • PhD Student
  • Physician
  • Post-doc
  • Prize
  • Project Manager
  • Research Associate
  • Research Engineer
  • Retired scientist
  • Technician
  • Undergraduate Student
  • Veterinary
  • Visiting Scientist
  • Deputy Director of Center
  • Deputy Director of Department
  • Deputy Director of National Reference Center
  • Deputy Head of Facility
  • Director of Center
  • Director of Department
  • Director of Institute
  • Director of National Reference Center
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  • Head of Facility
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© Research
Equipment

Automatic Plunge Freezer

Team: Ultrastructural BioImaging
Scientific Fields
Diseases
Organisms
Applications
Technique

Leica • EM GP

EM_GP

Plunge freezing

For samples with thickness < few microns, such as isolated particles including proteins, macromolecular complexes, decorated liposomes, viruses, bacteria, eukaryotic cells….

Samples are deposited or grown directly onto EM grids and cryo-fixed in their hydrated state by plunge freezing in liquid ethane at liquid nitrogen temperature. As a result, the sample is vitreous (non-crystalline) and embedded in a thin layer of vitreous ice, that ensures the highest structural preservation of the sample.

For imaging in a cryo-TEM, the ice thickness should not exceed ~500 nm.

For thicker samples (> 1 um), three options are available:

  • plunge-freezing followed by cryo-FIB-SEM thinning with cryo-lamellae
  • HPF followed by cryo-sectioning (CEMOVIS)
  • Vitrification by plunge-freezing of Tokuyasu-style Sections (VoS)

Note: Plunge-freezing is compatible with chemical fixation of the sample.

Blanco-Rodriguez G, Gazi A, Monel B, Frabetti S, Scoca V, Mueller F, Schwartz O, Krijnse-Locker J, Charneau P, Di Nunzio F,  Remodeling of the core leads HIV-1 pre-integration complex in the nucleus of human lymphocytes,  J. Virol. 2020 Apr;.