One of the major problems confronting agricultural production is heavy metal contamination of agricultural soils, which imposes considerable limitations on productivity and leads to great consumer health and safety concerns about the products obtained on these soils. The objective of this study was to evaluate heavy metal dynamics in the soil-leaf-fruit system in an intensive apple cv. 'Idared' planting located in the Municipality of Goražde. Heavy metal contents in the soil samples and plant material were determined by atomic absorption spectrophotometry using a Shimadzu 7000 AA device, according to the instructions specified in the ISO 11047 method. The dynamics of the heavy metals analyzed, excepting zinc, in the soil-leaf-fruit system was characterized by relatively high total levels of heavy metals in the soil and a very low degree of their accumulation in the leaves and in particular the fruits. No fruit sample was found to have toxic levels of any of the heavy metals analyzed. In terms of soil contamination, this suggests the suitability of the study location for safe apple fruit production.

Tourist destinations around the world are trying to cope with the needs of visitors, which are very susceptible to change. Nowadays, tourists are becoming more sophisticated and knowledgeable; their needs for extensive and diverse experiences increasing. As opposed to the destinations whose tourism development depends on the natural resources that are difficult to influence and whose business is susceptible to the negative impacts of seasonality, destinations of city and cultural tourism have more space to design their offers and contents that can satisfy the needs of travelers of the modern age. Content that can make a destination unique and well known, is the cultural heritage created in the Art Nouveau style. The Vienna secession architectural masterpieces can represent major tourist attractions in some destinations. For example, many attractive tourist cities such as Aveiro, Barcelona, Prague and Hamburg tourists visit just in order to feel and experience these works of art. For this reason, it is very important to point out Art Nouveau as an essential part of the cultural heritage of the destination and enable informing and introducing tourists with this valuable tourism potential. The initial hypothesis of this paper is that Aveiro has authentic cultural heritage in the Art Nouveau style that enriches the tourist offer of the city and that attracts a certain segment of the tourism market. The aim of the paper is to examine the participation and influence of Art Nouveau heritage in the tourism industry of Aveiro.

This paper describes full lab-scale investigation of Middle-Bosnia coals launched to support selection an appropriate combustion technology and to support opti- mization of the boiler design. Tested mix of Middle-Bosnia brown coals is pro- jected coal for new co-generation power plant Kakanj Unit 8 (300-450 MWe), EP B&H electricity utility. The basic coal blend consisting of the coals Ka- kanj:Breza:Zenica at approximate mass ratio of 70:20:10 is low grade brown coal with very high percentage of ash - over 40%. Testing that coal in circulated fluidized bed combustion technique, performed at Ruhr-University Bohum and Doosan Lentjes GmbH, has shown its inconveniency for fluidized bed combustion technology, primarily due to the agglomeration problems. Tests of these coals in PFC (pulverized fuel combustion) technology have been performed in referent laboratory at Faculty of Mechanical Engineering of Sarajevo University, on a lab-scale PFC furnace, to provide reliable data for further analysis. The PFC tests results are fitted well with previously obtained results of the burning similar Bosnian coal blends in the PFC dry bottom furnace technique. Combination of the coals shares, the process temperature and the air combustion distribution for the lowest NOx and SO2 emissions was found in this work, provided that combus- tion efficiency and CO emissions are within very strict criteria, considering spe- cific settlement of lab-scale furnace. Sustainability assessment based on calcula- tion economic and environmental indicators, in combination with Low Cost Planning method, is used for optimization the power plant design. The results of the full lab-scale investigation will help in selection optimal Boiler design, to achieve sustainable energy system with high-efficient and clean combustion tech- nology applied for given coals.

1Family medicine education center at Health Center Tuzla, Bosnia and Herzegovina 1University of Tuzla Faculty of medicine, Department of family medicine, Bosnia and Herzegovina 2Family medicine education center at Health Center Zenica, Bosnia and Herzegovina 3Family medicine education center at Health Center Mostar, Bosnia and Herzegovina Selective serotonin reuptake inhibitors and risk for gastrointestinal bleeding Едукативни чланци / Educational Articles