In the 1992 and 1993 vegetation seasons, investigations were carried out on the distribution of plants from the orchid family in the area roughly corresponding to the Wyżyna Częstochowska (Częstochowa Upland) mesoregion (341.31 in the classification of Kondracki 1980). During those investigations, sites of occurrence were found for 22 species, 5 interspecific hybrids and 1 intergeneric hybrid. Of special interest are the sites of Russow’s Marsh Orchid (Dactybrhiza russowii), Violet Helleborine (Epipaclis purpurata) and Greater Butterfly Orchid (flatanihera chloraniha) as well as of aJl the nothotaxa, which have never been found in this area before.
The active transport of oxidized glutathione and glutathione S-conjugates has been demonstrated for the first time in erythrocytes and this cell remained the main subject of research on the "glutathione S-conjugate pump" for years. Further studies identified the "glutathione S-conjugate pump" as multidrug resistance-associated protein (MRP). Even though cells overexpressing MRP and isolated MRP provide useful information on MRP structure and function, the erythrocyte remains an interesting model cell for studies of MRP1 in its natural environment, including the substrate specificity and ATPase activity of the protein.
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