X-RAY TOPOGRAPHY OF LYSOZYME CRYSTALS

Laue topography of orthorhombic and tetragonal lysozyme crystals has b een carried out using synchrotron radiation. A water filter, 5 mm in t hickness, was effective to avoid radiation damage. The orthorhombic cr ystals grown at 38 degrees C showed strong asterisms. The tetragonal c rystals grown at room temperature and the orthorhombic crystals incuba ted at room temperature from small crystals emerging at 38 degrees C d id not show asterism but showed white bands in black Bragg spots resem bling the shape of the crystals. Straight bands directed to the radial directions of the diffraction pattern, wavy bands parallel to the c-a xis of the orthorhombic crystal and straight twisted bands parallel to several directions in the tetragonal crystal were also observed.