Scanning Transmission Electron Microscopy and Small-Angle Scattering Provide Evidence that Native Escherichia coli ClpP is a Tetradecamer with an Axial Pore

Biochemistry ◽  
1995 ◽  
Vol 34 (34) ◽  
pp. 10910-10917 ◽  
Author(s):  
John M. Flanagan ◽  
Joseph S. Wall ◽  
Malcolm S. Capel ◽  
Dieter K. Schneider ◽  
John Shanklin
Keyword(s):  
Electron Microscopy ◽  
Escherichia Coli ◽  
Transmission Electron Microscopy ◽  
Small Angle ◽  
Scanning Transmission Electron Microscopy ◽  
Small Angle Scattering ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Angle Scattering ◽  
Scanning Transmission

Scanning Transmission Electron Microscopy of Polyethylene Crystals

1980 ◽  
Vol 38 ◽  
pp. 242-245
Author(s):  
F. Khoury ◽  
L. H. Bolz
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Crystallization Temperature ◽  
Scanning Transmission Electron Microscopy ◽  
Growth Habit ◽  
Lateral Growth ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Growth Habits

The lateral growth habits and non-planar conformations of polyethylene crystals grown from dilute solutions (<0.1% wt./vol.) are known to vary depending on the crystallization temperature.1-3 With the notable exception of a study by Keith2, most previous studies have been limited to crystals grown at <95°C. The trend in the change of the lateral growth habit of the crystals with increasing crystallization temperature (other factors remaining equal, i.e. polymer mol. wt. and concentration, solvent) is illustrated in Fig.l. The lateral growth faces in the lozenge shaped type of crystal (Fig.la) which is formed at lower temperatures are {110}. Crystals formed at higher temperatures exhibit 'truncated' profiles (Figs. lb,c) and are bound laterally by (110) and (200} growth faces. In addition, the shape of the latter crystals is all the more truncated (Fig.lc), and hence all the more elongated parallel to the b-axis, the higher the crystallization temperature.

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