Abstract. The Pulkovo spectrophotometric catalog was published in Baltic Astronomy Vol.5 No.4 (1996). Here we present a supplement of the catalog containing the flux distribution data for 77 stars in the wavelength range from 320 nm to 735 nm. Actually, this is a direct continuation of Table 6 of the catalog.

Abstract.A spectrophotometric catalog is presented, combining results of numerous observations made by Pulkovo astronomers at different observing sites. The catalog consists of three parts: the first contains the data for 602 stars in the spectral range of 320-735 nm with a resolution of 5 nm, the second one contains 285 stars in the spectral range of 500-1080 nm with a resolution of 10 nm and the third one contains 278 stars combined from the preceding catalogs in the spectral range of 320-1080 nm with a resolution of 10 nm. The data are presented in absolute energy units W/m 2 m, with a step of 2.5 nm and with an accuracy not lower than 1.5-2.0 %.

The possibility of using sound-stimulated extraction in order to increase the yield of flavonoids from fruits of bird cherry (Padus avium Mill.) was studied. The flavonoid yield depends on the extractant type and temperature. By selecting the optimum extraction conditions and using acoustic treatment, it is possible to achieve a considerable (~48 %) increase in the efficiency of extraction with a significantly reduced extraction time.

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Abstract. We retrieved the total content of the atmospheric water vapor (or Integrated Water Vapor, IWV) from extensive sets of photometric data obtained since 1995 at Lindenberg Meteorological Observatory with star and sun photometers. Different methods of determination of the empirical parameters that are necessary for the retrieval are discussed. The instruments were independently calibrated using laboratory measurements made at Pulkovo Observatory with the VKM-100 multi-pass vacuum cell. The empirical parameters were also calculated by the simulation of the atmospheric absorption by water vapor, using the MODRAN-4 program package for different model atmospheres. The results are compared to those presented in the literature, obtained with different instruments and methods of the retrieval. The reliability of the empirical parameters, used for the power approximation that links the water vapor content with the observed absorption, is analyzed. Currently, the total (from measurements, calibration, and calculations) errors yield the standard uncertainty of about 10 % in the total column water vapor. We discuss the possibilities for improving the accuracy of calibration to ∼1 % as indispensable condition in order to make it possible to use data obtained by optical photometry as an independent reference for other methods (GPS, MW-radiometers, lidar, etc).Correspondence to: V. V. Novikov (novikov victor@mail.ru)