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Figure 4
Diffraction patterns taken on the microfocus beamline ID13. (a) Part of the diffraction pattern from a crystal of bacteriorhodopsin, unit-cell parameters a = b = 62, c = 104 Å. The unit-cell c axis can be clearly visualized running from bottom left to top right in the figure. The edge of the diffraction pattern represents a resolution of around 2.5 Å. Data along the c axis are difficult to obtain using cryo-electron microscopy techniques with two-dimensional crystals. (b) Diffraction patterns of the H50S ribosome complex. The inset diagram shows how the horizontal divergence of the microfocus beam causes the diffraction spot shape to elongate in the horizontal direction, thus necessitating careful mounting of the crystal. (Figure reproduced by courtesy of Professor Ada Yonath.)

Journal logoBIOLOGICAL
ISSN: 1399-0047
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