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The diversity of solute flow was determined according to 1981-2000 data, taking into account environmental factors. The water assessment was based on analysis results from 19 rivers in the area between the Wisła and Bug rivers (Fig. 1). Based on average annual values of six parameters (general mineralisation in the form of dry residue, concentrations of dissolved oxygen and of chloride, phosphate and ammonia nitrogen ions as well as the amount of organie compounds - BOD₅), pollution indices were determined, enabling the classification of the river basins analysed according to a five-degree pollution scale (the first degree being "clean" rivers and the fifth degree denoting "critically polluted" rivers). A comparison of study results from the 1991-2000 period to the corresponding data from the 1981-1990 period indicates a trend towards the improvement of water purity in rivers. The results achieved show that in most areas of the Lublin Region rivers drain basins that exhibit high environmental values ("clean" and "slightly polluted" basins) and low levels of the environmental burden caused by economic activity. Solute flow from those basins depends on geological and hydrological conditions (Fig, 2, Fig. 3). Approximately 80-85% of the solute flow from those basins account for the chemical denudation of the lithosphere.
The Łęczyńsko-Włodawskie Lake District is one of the main tourist regions of Eastern Poland. The main form of tourism is here mass tourism, based on the use of lakes’ shores. The article presents the results of surveys conducted on a group of 850 people rested on the most attractive lakes of area. The issues were mainly related to motives of arrival, ways of spending time and the assessment of tourist attractiveness of the area and the tourist infrastructure. The results indicate a high appreciation of the natural values of the area by tourists. Tourists perceived both positive and negative impacts of tourism development.
AMP-deaminase from hen stomach smooth muscle was isolated and physico-chemi­cal properties of the purified enzyme were investigated. The enzyme had an activity optimum at pH 6.5, and poorly deaminated the substrate analogues tested. At optimum pH (6.5), in the absence of regulatory ligands (control conditions), the enzyme manifested hyperbolic substrate-saturation kinetics with half-saturation constant GS0.5) of about 4.5 mM. Additions of adenine nucleotide effectors (ATP, ADP) activated the enzyme strongly at all the concentrations tested, diminishing sig­nificantly the value of S0.5 constant. In contrast, the regulatory effect of ortho­phosphate was variable, and depended on the orthophosphate concentration used. The molecular mass of the enzyme subunit determined in SDS/PAG electrophore­sis was about of 37 kDa. The obtained results suggest that in different types of hen muscle, similarly as in humans and rats, expression of AMP-deaminase is under the control of independent genes.
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