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The software package for the YuMO spectrometer has been updated. The MS DOS programs used before the updating are compared to the similar new programs operating in the OS-9 environment. The merits and demerits of each program are discussed. The main features of the new software are described, and the results of the long-term operation of the new software package are analyzed. It is shown that upgrading the software has improved spectrometer control.

The results of a study of the temperature and pressure dependence of isothermal compressibility of dimyristoylphosphatidylcholine (DMPC) are presented. The data were obtained using a small-angle X-ray scattering instrument in the Institute of Synthetic Polymer Materials (Moscow, Russia) and a device designed in the Laboratory of Neutron Physics, Joint Institute for Nuclear Research (Dubna, Russia), for studying the liquid systems by a volumetric P-V-T method. The minute baric investigation of the region of the main phase transition (transition from the gel phase into the liquid crystalline phase) was carried out. The points of the main phase transition were determined, and the phase diagram of DMPC was plotted over the pressure range of 1-800 bar at temperature from 24 to 35 degrees C.