ELECTRON MICROSCOPY

Sample

Histone Octamer Tubular Crystal

Specimen Preperation
Sample Aggregation State FILAMENT
Vitrification Instrument ?
Cryogen Name ?
Sample Vitrification Details Negative Stain 0.2% Uranyl Acetate
3D Reconstruction
Reconstruction Method HELICAL
Number of Particles 3500
Reported Resolution (Å) 20
Resolution Method ?
Other Details 11-fold rotational symmetry imposed during backprojection
Refinement Type
Symmetry Type HELICAL
Map-Model Fitting and Refinement
ID 1
Refinement Space REAL
Refinement Protocol RIGID BODY FIT
Refinement Target Cross-correlation and van der Waals energy
Overall B Value ?
Fitting Procedure ?
Details METHOD--Because of the helical line group, the dyad axis is constrained to lie facing the helical axis and reduces the search to rotations and translations about this dyad REFINEMENT PROTOCOL--Constrained Rigid Body
Data Acquisition
Detector Type KODAK SO-163 FILM
Electron Dose (electrons/Å2) 100
Imaging Experiment
Date of Experiment ?
Temprature (Kelvin)
Microscope Model ZEISS LEO912
Minimum Defocus (nm) 1000
Maximum Defocus (nm) 800
Minimum Tilt Angle (degrees) 0
Maximum Tilt Angle (degrees) 0
Nominal CS ?
Imaging Mode BRIGHT FIELD
Specimen Holder Model ?
Nominal Magnification 50000
Calibrated Magnification ?
Source TUNGSTEN HAIRPIN
Acceleration Voltage (kV) 120
Imaging Details ?
Image Processing
CTF Correction Type CTF Correction Details Number of Particles Selected Particle Selection Details
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