Source of tunable radiation based on Ti(3+):Al(2)O(3) crystals pumped by a copper-vapor laser.

A source of tunable coherent radiation based on the use of Ti(3+):Al(2)O(3) crystals pumped by Cu-vapor laser radiation is studied experimentally. This source is promising for applications to atmospheric sensing as well as for use in applied optics and spectroscopy studies. Energy, kinetic, spectral, and spatial characteristics of lasing in nonselective and selective cavities and in the master oscillator power amplifier system are measured.

LiB(3)O(5): a highly efficient frequency converter for Ti:sapphire lasers.

Efficient second-harmonic generation in a LiB(3)O(5) crystal over the spectral range of a Ti:sapphire laser is demonstrated. The angular acceptance and damage threshold of the LiB(3)O(5) crystal are measured and calculated, and a 30% conversion efficiency is achieved (with a 5-mm-long crystal). The potential for increasing the conversion efficiency of second-harmonic generation at the edges of the spectral range of the Ti:sapphire laser is shown.

Study of the structure of streptokinase conjugates with a hydrophilic vinylpyrrolidone copolymer.

The modification of streptokinase by a synthetic N-vinylpyrrolidone copolymer leads to formation of conjugates varying in structures according to the proportions of the components in the reaction medium. Based on data obtained from spectrophotometry, as well as sedimentation and diffusion analyses, it is shown that in the presence of excess protein in the reaction medium, formation of the main chain takes place via the copolymer associated with several protein globules. Under conditions of excess modifier copolymer, either single-site and/or multiple-site bonding is possible for the protein backbone, depending on the molecular weight of the copolymer.

[Comparative study of diffusion coefficients of alpha-lactalbumins and lysozyme using polarization interferometer].

The method of macroscopic diffusion with polarization optics has been applied to compare the translational diffusion coefficients for three proteins with similar three-dimensional structures in different conformational states. It has been shown that the values of diffusion coefficients obtained by the method are almost the same as those obtained by quasielastic light scattering. However this method is more available since it is less sensitive to aggregation and requires less amount of protein for investigation.

[A study of native streptokinase and its polymeric derivative by means of small angle x-ray scattering].

The gyration radius (R0) of native streptokinase (SK) was found to be R0 = (40 +/- ) A by small-angle X-ray scattering. Experimental hydrodynamic characteristics of SK were S0(20),W = (2.8 +/- 0.