EMS GRIDS & TEM SUPPORT FILMS CATALOG EDITION IV TEM SUPPORT FILMS
zzz UltrAuFoil™
These newly developed ultrastable gold supports for electron cryomicroscopy will reduce the movement of frozen specimens during imaging. This improves image contrast and quality, leading to better 3D reconstructions with less data.
During imaging at cryo-temperatures, traditional carbon supports move, particularly at the beginning of irradiation. This movement blurs images and makes it difficult to determine the structures of small and challenging molecules.
Using UltrAuFoils™, designed at MRC’s Laboratory of Molecular Biology by Dr Christopher J. Russo and Dr Lori A. Passmore and produced by Quantifoil Micro Tools, specimen motion can be reduced significantly. (For details see: Ultrastable gold substrates for electron cryomicroscopy, Science, 2014, Vol. 346 no. 6215 pp. 1377-1380).
Characteristics of UltrAuFoil™ Thickness of Gold Foil about 500 Å Structure of Gold Foil
Ordering Information Hole
Type
R 0.6/1 Gold
R 1.2/1.3 Gold
R 2/2 Gold
Size Holey Gold Films
FREQUENTLY ASKED QUESTIONS ABOUT... UltrAuFoil™
Holey Gold Films
Why is the foil made of gold? Because it is a highly conductive, nonoxidizing, radiation-hard material whose surface is chemically inert and biocompatible.
Why is the foil 500 Å thick? 400-500 Å is optimal because it minimizes motion as much as thicker layers but still gives thin ice films under typical blotting conditions. Below 400 Å, the performance of the gold support foils begins to degrade.
Why is the TEM grid made of gold? Using the same metal eliminates differential thermal contraction during cooling of the sample and therefore prevents changes in the geometry and tension of the support foil.
How should I store the UltrAuFoils™ and within which time should I use them? The UltrAuFoils™
like our other products should be stored in a grid storage box in a dark, cool and low-humidity environment. Generally there is no date of expiry, but we recommend to use them within two years.
Do I need to modify the UltrAuFoils™ before use? No, they are ready for use when delivered. They can be made more hydrophilic using standard glow discharge and plasma systems or other gold surface treatments.
How do I set up the beam for data collection? Currently, the recommended electron beam geometry is circularly symmetric beam, centered on the hole, which encompasses a small region of the support around each hole. The micrograph is taken in the center of the hole.
How do I focus using UltrAuFoils™? Since there is no amorphous material in the gold support structure, Thon rings cannot be used to focus. As discussed in the publication, several other options are available, but the two simplest are:
1. Turn on beam tilt wobble and minimize the image shift.
regular square array of micrometer-sized circular holes
All other geometries and thicknesses available upon request Grid
Cat. # Period 200 Mesh
0.6μm 1.6μm — 1.2μm 2.5μm — 2μm
Cat. # 300 Mesh
Q350AR1A Q350AR13A
4μm Q250AR2A — YOU MAY NEED...
TEM Checker Monitor the
performance of your x-ray detectors. Contains (5) 3mm dia. manganese disks in a standard grid storage box.
Qty.
50/pk 50/pk 50/pk
2. Look for the diffracted beams at the edge of a hole with the objective aperture removed. When the shift between the diffracted beams and the crystals of gold is minimized, the foil is in focus.
How do I correct the astigmatism? We recommend using a calibration specimen to correct the stigmation and beam tilt prior to collecting data on UlrAuFoils™
.
Can I use automated data collection methods? Yes, automated data collection has been successfully tested on UltrAuFoils™
using beam tilt to focus.
Are UltrAuFoils™ fragile? No, they are similar or less fragile than traditional carbon foils. But if mishandled with tweezers or broken during freeze plunging, the stability of the support may be severely degraded. We recommend collecting data only from squares where the foil is uniform and intact.
Can I add a continuous film of amorphous carbon? Yes. Standard float transfer methods work fine for transferring thin films of carbon onto UltrAuFoils™
.
Look for these items and more in our digital catalog, or visit
www.emsdiasum.com
GloQube® Plus
Glow Discharge System for TEM Grids and Surface Modification
Applications: • Hydrophilization and cleaning of TEM grids carbon support films (typically: Formvar®
,
Lacey Carbon, Holey Carbon, Continuous Carbon, Quantifoil®
for better sample spreading
• Improved adhesion and orientation of proteins, nucleic acids and antibodies
• TEM grid preparation for nanoparticle studies 53
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