Analysis has studied northern part of Jahorina, Ravna Mountain, whose karst plateau presents water aggregation surface for Paljanska Miljacka and Bistrica flows, which are used as water supply for Sarajevo and Pale. This paper presented hydrogeological and hydrological characteristics of the area and applied analyzes of other physical-geographic characteristics which are an essential indicator of the quality of groundwater. Applying various methods, we have obtained maps that shows different ways of groundwater pollution in karst. We analyzed spatial relationships and connections with individual socio-geographical components. Thought correlation methods we obtained results which provided conclusions for possible measures against pollution of groundwater in karst and karst in general.

Family Lamiaceae (labia) includes a large number of cosmopolitan species including Thymus alpestris (Thyme) characterized by the presence of essential oils and phenolic compounds. It represents a perennial semi-shrubby plant. The antioxidant potential of thyme is due to the presence of polyphenolic acids and flavonoids. The topic of this paper is the extraction of thyme (Thymus alpestris) with 40% ethanol and 50% ethanol, using Soxhlet method (circulatory extraction), after which, the content of phenolics and flavonoids was determined in order to confirm the antioxidant potential of this plant species. The results show that 40% ethanol extract has the highest content of phenolics and flavonoids and the highest antioxidant potential, resultingly.

<p>Prilikom istraživanja ruderalne vegetacije Pala izdvojena je zajednica Onopordetum acanthii Br.-Bl. 1926. U radu je prikazan floristički sastav, ekološke i fitogeografske karakteristike ove asocijacije. Floristički sastav navedene fitocenoze čine 94 vrste od kojih edifikatorska vrsta Onopordum acanthium ostvaruje najveći stepen prisutnosti (V) i pokrovnost (2150). Analizom areal spektra zajednice utvrđena je dominacija vrsta širokih areala iz evroazijske grupe flornih elemenata, a od životnih formi hemikriptofita. Pri izgradnji zajednice u ekološkom pogledu dominiraju submezofite, neutrofilne, mezotrofne, mezotermne vrste i vrste koje se razvijaju u uslovima polusjenke i pune dnevne svjetlosti.</p>

VelikaTišina swamp is located far north of the Republic of Srpska and Bosnia and Herzegovina, and belong to the territory of the Municipality of Šamac. The vascular flora was investigated within the Conservation Study, which was done in cooperation with the Republic Institute for the Protection of the Cultural and Historical Natural Heritage of the Republic of Srpska and GEF/UNEP as part of the project „Achieving Biodiversity Conservation through the Establishment and Effective Management of the Protected Area and Capacity Building for Nature Conservation Bosnia and Herzegovina“. Research was carried out in the period 2010-2011. There were identified 236 species that were classified into 3 classes, 179 genera and 71 families. In phytogeographic view is dominated species of wider geographical distribution from the eurasian, cosmopolitan, boreal and adventive areal groups. The biological spectrum indicate the hemicryptophytes-terrophytic-hydrophytic character of life forms. According to the IUCN Red List, about 55% of the species are mostly of low concern (LC) category, those species have a stable population but are not designated as dependent on protection nor nearly endangered. According to the Red List of Protected Species of the Flora and Fauna of the Republic of Srpska, in this area 22 taxa with no specific threat category were recorded and in the Red List of the Federation of BiH 6 species are in the vulnerable species (VU) category, 1 species in the LC category.

Soil is one of the most important natural resources. Measurement of natural radioactivity in soil is very important to determine the amount of change of the natural background activity with time as a result of any radioactivity release. Coal mine and thermal power plant in Gacko field is a very important industrial facility. The content of radionuclides of the soil was examined at Gacko area, slag, ash and mullock dumps in thethermal power plant Gacko and soils of dumps in the process of re-cultivation. The gamma – spectrometric measurements were done in the Institute of Nuclear Sciences “Vinča” in Belgrade.Soil samples were collected in 2010/2014 at more locations in eastern part of Republic of Srpska. After removing the stones and vegetation, all soil samples for Gama spectrometric measurements dried up to 0 105 C, sieved, placed in the plastic 500 mL Marinelli beakers and left for four weeks to reach radioactive equilibrium. Given that there are no specific regulations in the Republic of Srpska, the concentration of natural and produced radionuclides in samples from the working and living environment of thermal power plants, comparison with literature data from the region and the world is one way of evaluating the impact of the plant's operation on the soils. The results point to the necessity of regular monitoring of radioactivity in eastern Herzegovina in order to assess the impact of the technologically increased natural radioactivity.