Tourism development planning requires consideration of indicators regarding the intensity of tourist activity within destination and measure that should not be exceeded in further improvement of this activity, in order to prevent disturbing the needs of local community and sustainability of local environment. The village Zlakusa is located within the territory of the City of Užice and it represents an important tourism destination of Southwestern Serbia. Rural tourism of Zlakusa is characterized by its authenticity and recognition, regarding the pottery and ethnopark called "Terzića avlija". Accordingly, tourist function indicators were used in this research: tourist accommodation density, Defert Baretje's index, Charvat's index and Schneider's index, with the aim of emphasizing the importance of rural potentials of Zlakusa for tourism development within this village, but also within the whole territory of the City of Užice. Research results showed that tourism is important industry within Zlakusa, with necessity of its further affirmation on tourist market and its adaptation to contemporary needs of modern tourists. Also, research results showed that Zlakusa participates in total tourist arrivals with 18%, as well as in total tourist overnights with 13% and it comprises 1.9% of accommodation capacities of the overall tourism development within the City of Užice for observed period (2008-2016). Therefore, results of this study actually show that Zlakusa is highly oriented towards tourism industry, which is the main reason of necessity for further improvement of conditions for its development, especially in the case of rural tourism, without threatening the local community and local environment.

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Tourism development, if not sustainable, could threat and affect the environment as an object of tourists' interest. Accordingly, hotels as a type of tourism organizations within a destination, are trying to involve sustainable business activities in their operations in order to protect the environment. In hotels within developed countries, sustainable activities are already implemented in the business and they are in the balance with the environment. However, implementation of these activities within societies in transition, such as Serbia, is still in initial level, which is confirmed in this research. The subject of this paper is, therefore, oriented toward the business activities of hotels located within Kopaonik, popular destination of winter tourism and National Park of Serbia, and these activities are researched through the employees' perspective of ecological, socio-cultural and economic principles of the hotel business. Methods used in the paper are: descriptive, comparative, statistical and the critical one. Also, a survey research was conducted for the purpose of the paper and it obtained a sample of 211 hotel employees. The research results explained the current state within the hotel business of Kopaonik related to activities focused on ecological, socio-cultural and economic principles of sustainable development. Also, results indicate the level of employees' job satisfaction and the level of their job commitment in accordance with hotels' involvement in sustainable practices. All researched constructs of the paper are interpreted as important aspects of Kopaonik's sustainability on the tourist market.

Rindera umbellata (Waldst. & Kit.) Bunge is a rare, critically endangered and horticulturally appealing plant with unexplored pharmaceutical potential. Its distribution is restricted to sandy habitats, whereas propagation in nature is limited by fungal infections of the seeds. To initiate its ex situ conservation and provide material for metabolomic studies, we have introduced R. umbellata into in vitro culture using immature embryos as primary explants. A 72% of the embryos germinated on growth regulator-free medium. The optimization of growth conditions was based on varying carbohydrates (sucrose, glucose, and fructose) in the medium. In vitro growth and development of R. umbellata plants were significantly affected by both the type and concentration of the applied sugars. For most recorded parameters, including leaf elongation, biomass production, rooting percentage, and the number and length of roots, 0.1 m sucrose was optimal. The highest percentage of explants with developed buds was achieved on 0.06 m sucrose (38.77%) or 0.3 m glucose (27.43%). The plantlets obtained on 0.1 m sucrose were successfully acclimatized to greenhouse and field conditions with survival rates of 71.43% and 42.86%, respectively. To our best knowledge, this is the first publication dedicated to this species.

NaSA can improve C production in sage shoot culture, probably by stimulating the conversion of CA to C.