Search Results

You are looking at 1 - 5 of 5 items for

  • Author: Marek Chmiel x
Clear All Modify Search
Open access

Zdzisław Michalczyk, Stanisław Chmiel and Marek Turczyński

Lake water stage dynamics in the Łęczna-Włodawa Lake District in 1991-2010

In the years 1991-2010 the water stages of 38 lakes in the Łęczna-Włodawa Lake District were observed. Water stage dynamics of the Łęczna-Włodawa lakes was varied. A multi-annual trend with seasonal water stage variability was clearly observable. Low water stages were observed in the years 1994-1996 and 2004-2005, whereas the highest water stages were reported for 2002 and 2010. The water stages of Lake Piaseczno, the deepest lake, were consistent with solar activity changes. Land improvement works in the Łęczna-Włodawa Lake District and black coal mining caused further local changes in the directions of flow of surface and underground water, as well as modifying the water stage regime of some of the lakes.

Open access

Anna Wolak-Tuzimek, Joanna Tarnawska and Marek Chmiel

Abstract

Areas of Corporate Social Responsibility (CSR) have been defined in ISO 26000. Guidelines of the International Standardisation Organisation distinguish seven areas: corporate governance, human rights, labour practices, natural environment, fair operating practices, consumer issues, social commitment and development of local communities. This article presents good practices implemented by enterprises in the individual areas, in particular, actions in the area of the natural environment. Two research hypotheses are posited concerning the rate of implementing good CSR practices and the number of actions in the natural environment area. National Responsible Business Forum research and a survey of a group of enterprises in the Mazovian region, conducted by the authors in 2014–2016, served to verify the hypotheses. The results imply that the number of good practices realised in CSR areas tends to grow. In addition, actions in the area of the natural environment rank third with regard to good practices implemented.

Open access

Marek Chmiel, Mariusz Kastek, Dariusz Całus and Krystian Szczepański

Abstract

The range of applications in which remote detection of chemical compounds is used extends from monitoring of technological processes through diagnostics of industrial installation and environmental control up to military applications. The methods and the devices used for the passive detection of selected gases are presented. The change in the signal reaching the camera caused by the presence of gas was calculated. The successful detection can be achieved if the absorption (or emission) of a gas cloud, located between object (background) and the camera, causes signal change greater or equal to noise equivalent temperature difference (NETD) of the camera.

Open access

Marek Turczyński, Zdzisław Michalczyk, Stanisław Chmiel, Katarzyna Mięsiak-Wójcik and Sławomir Głowacki

Evaluation of the hydrological role of wetlands in the Włodawka River catchment (Polesie Lubelskie)

The Włodawka River catchment of an area of 725 km2 covers the central and eastern part of the Łęczna-Włodawa Lake District. Evaluation of the role of hydrogenic areas in runoff creation was based on materials of the Department of Hydrography and the Institute of Meteorology and Water Management data. The analysis was conducted for selected catchments in which additional hydrometric measurements and water quality tests were done. Such parameters as: the share of hydrogenic surfaces in total catchment area, types of wetlands, their hypsometric location and position with reference to drainage streams were taken into consideration for evaluation. The degree of anthropogenic transformation of the marshland was expressed in terms of density and depth of the drainage ditches that dissect it. It was found that the drained gyttja of Krowie Bagno plays a considerable role in increasing the minimum discharge. Wetlands in the Włodawka River catchment influence the conditions of the runoff and water quality, which is noticeable, primarily, in the concentration of organic carbon, and of nitrogen and phosphorus compounds.

Open access

M. Szczubiał, M. Kankofer, R. Dąbrowski, M. Bochniarz and R. Urban-Chmiel

Abstract

The aim of the study was to investigate oxidative stress during normal pregnancy in female dogs based on an evaluation of plasma markers for lipid and protein peroxidation. Twenty clinically healthy female dogs (10 non-pregnant and 10 pregnant) were used in the study. Blood samples from the pregnant animals were collected at 19-21, 38-40, and 56-58 days of pregnancy. Blood samples from non-pregnant female dogs were obtained between 20 and 35 days after ineffective breeding. As indicators of oxidative stress, we measured the following using spectrophotometric and spectrofluorimetric methods: thiobarbituric acid reactive substances (TBARS), radical cations of N, N, diethylpara-phenylene diamine (RC-DEPPD), sulfhydryl groups (SH groups), bityrosine and formylkynurenine. The mean plasma TBARS concentration in the pregnant dogs (0.486 ± 0.071 – 0.581 ± 0.191 μmol/g protein) was significantly higher (p<0.05) than that found in the non-pregnant animals (0.274 ± 0.111 μmol/g protein). A marked, although not significant, decrease in SH group content, as well as an increase in bityrosine and formylkynurenine concentration were concurrently observed in the pregnant dogs. No significant differences were found in terms of the studied markers in the pregnant animals when comparing the values obtained during the investigated periods of pregnancy, although there was a progressive decrease in TBARS concentration and a progressive increase in RC-DEPPD, bityrosine and formylkynurenine contents. Our findings suggest that normal pregnancy in female dogs is associated with oxidative stress. Further studies are necessary to establish the physiological ranges of antioxidative/oxidative profiles in pregnant dogs and to explain if and how the intensity of oxidative stress might contribute to the risk of the complications of pregnancy.