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Electron Cryotomography of Bacterial Cells

Electron Cryotomography of Bacterial Cells

Published on: May 6, 2010

Q-band EPR cryoprobe.

Vidmantas Kalendra¹, Justinas Turčak², Gediminas Usevičius²

¹Faculty of Physics, Vilnius University, Sauletekio 3, LT-10257 Vilnius, Lithuania; Amplify My Probe Ltd., London NW1 1NJ, UK.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)

|October 19, 2023

Summary

This summary is machine-generated.

We developed a Q-band Electron Paramagnetic Resonance (EPR) cryoprobe with an integrated ultra-low-noise amplifier. This significantly enhances sensitivity, reducing measurement times by approximately 40x for Q-band EPR experiments.

Keywords:

Cryoprobe EPR LNA Noise Q-band Sensitivity

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Area of Science:

Spectroscopy
Electron Paramagnetic Resonance (EPR)
Cryogenic Technology

Background:

Advancements in X-band Electron Paramagnetic Resonance (EPR) have shown success with cryogenic signal preamplification.
Q-band EPR offers higher spectral resolution but faces sensitivity challenges.

Purpose of the Study:

To develop and evaluate a Q-band EPR cryoprobe with integrated cryogenic preamplification.
To assess the sensitivity enhancement and performance for continuous wave (CW) and pulsed EPR/ENDOR experiments.

Main Methods:

Designed a Q-band EPR cryoprobe incorporating an ultra-low-noise microwave amplifier and protection circuit within the cryostat.
The cryoprobe was tested with a standard EPR resonator, maintaining typical Q-band sample access and tuning capabilities.
Performance was benchmarked against commercial and home-built Q-band spectrometers using CW EPR and pulsed EPR/ENDOR.

Main Results:

The developed cryoprobe demonstrates significant sensitivity improvements at cryogenic temperatures (6 K).
Measurement times were reduced by a factor of approximately 40× compared to existing Q-band spectrometers.
The setup supports high-power pulsed EPR experiments on standard samples.

Conclusions:

The Q-band EPR cryoprobe with integrated cryogenic preamplification offers a substantial increase in sensitivity.
This technology enables faster and more efficient Q-band EPR measurements, particularly at low temperatures.
The cryoprobe is compatible with standard EPR setups and advanced pulsed techniques.