[en] The dependences between spectral types, colour indices, absolute magnitudes, surface brightness and radii of the stars of luminosity classes I, III and V are presented. The similar comparison is made for the classical cepheids. Their radii Rsub(c) being obtained from surface brightness and absolute magnitudes are compared with the radii R being obtained directly with Wesselink's method. The small but systematic difference log R - log Rsub(c) = +0,06 have been found. (author)

[en] A simplified method of calculating classical Cepheid distances is proposed. It is based on photometric data, without the use of the reddenings. By means of results obtained in this way the following problems are discussed: Cepheid double and more numerous aggregates; Properties of the cluster and association Cepheids; The < B-V>₀-logP and ΔV-< B-V>₀ relations in selected parts of the Galaxy. 15 refs., 15 figs., 11 tabs. (author)

[en] A rediscussion of the period-luminosity relation of type I-cepheids is presented. Special attention is paid to the radius and its variation. (Auth.)

[en] Some of alkyl- and alkylamino- derivatives of 6H-indolo[2,3-b]quinolines are known to be active antiproliferative and cell cycle modulating compounds. Their cytotoxic properties are, at least in part, due to DNA intercalation ability and topoisomerase II inhibition activity. To improve physicochemical and biological properties of 6H-indolo[2,3-b]quinolines the series of new, saccharide (C-2, C-9 or N-6) derivatives were designed and synthesized. The influence of different carbohydrate units (D-glucose, D-lactose, L-rhamnose, Lacosamine, L-daunosamine), position of attachment and linker size on cytotoxic properties and topoisomerase II inhibition activity were tested. Among compounds tested there were 2-deoxy-α-D-glucopyranoside (1-6), 2-deoxy-α-L-rhamnopyranoside (7-12) and 2-deoxy-α-D-lactopyranoside (13-18) derivatives in the group of saccharide moiety containing compounds and a-L-daunosaminide (19-24) and a-L-acosaminide (25- 27) in the aminosaccharide derivatives series as well. (author)