Figure 1
Relative unit-cell volume (closed squares), temperature (open triangles) and integrated ice-ring intensities (open circles) as a function of experimental time for (a) an orthorhombic and (b) a trigonal trypsin crystal that were cryoprotected without subsequent transfer to mineral oil. The ice intensities were summed up in the 2.3–2.19 Å resolution range and include the (110) reflection of hexagonal and the (220) reflection of cubic ice. Ice intensities do not refer to either of the y axes, are on an arbitrary scale and were zero at 100 K prior to initiation of the warming–cooling procedure. |