[Use of X-ray diffraction for studying the temperature dependence of the Young modulus of protein crystals].

The possibility of using X-ray diffraction for studying the elastic properties of protein crystals is considered. It is shown for hen egg--white lysozyme tetragonal crystals that the temperature dependences of the Young modulus obtained from X-ray scattering data and in direct mechanical measurements are the same. It is discussed how the changes in general mobility of protein atoms can be estimated using elasticity measurements.

[Elastic properties of triclinic crystals of lysozyme in anhydric acetonitrile].

Measurements of lysozyme crystal elastic properties in anhydrous acetonitrile were performed in order to investigate the role of water in protein elasticity. It was shown that triclinic crystals of lysozyme are suitable for such kind of investigation because of being placed in acetonitrile they save crystal lattice parameters. The observed changes of lysozyme crystals elastic properties are close to those found earlier for partially dehydrated protein.

A magnetic micromethod to measure Young's modulus of protein crystals and other polymer materials.

A new micromethod has been developed to measure the elastic modulus of polymer materials. It is based on measurements of bending of a polymer sample in a periodic uneven magnetic field acting on a small permanent magnet attached to the sample free end. As compared to the other methods known, it combines simplicity of resonant methods with a possibility to perform measurements at different frequencies in liquids under normal and high pressures.