UDK 630*81:674.031.632.2 This paper presents the research results on: Variation of widths and heights of 1-3 seriate wood rays within beech stem (Fagus silvatica,L.) Variation of widths and heights of 1-3 seriate wood rays within normal and tension branch

UDK 630*38 Secondary forest roads network or so-called technical infrastructure of the component should fulfill three important functions: (1) biological, (2) technical and (3) economical. By limitation of movement of working devices and loads via designed routes, the damages of soil and component have been minimized enabling their easier and faster movement. This results in more productive work with reduction of skidding costs and level of forest damages at the same time. The most important feature of tractor roads as the most frequent way of secondary forest roads network in Bosnia and Herzegovina is surely their longitudinal slope. The maximum allowed longitudinal slope of tractor roads should not exceed 12% if their conversion into truck roads has been planned for the future (Jeličić, 1983). On the contrary, the longitudinal slope of tractor roads should not exceed 16 % if the erosion activity of water and long-term usage of tractor roads have been taken into account (Jeličić, 1983), which is almost the rule in Bosnia and Herzegovina forestry practice. However, the maximum longitudinal slope of tractor roads in practice is very often higher than 30 %, which usually results with their fast ruining due to erosion impact of the water. In this article, at the selected forest area-department, the impact of the longitudinal slope of tractor roads and openness of a forest department and timber skidding costs have been analyzed.

The European Network of Forensic Science Institutes (ENFSI) recommended the establishment of forensic DNA databases and specific implementation and management legislations for all EU/ENFSI members. Therefore, forensic institutions from Bosnia and Herzegovina, Serbia, Montenegro, and Macedonia launched a wide set of activities to support these recommendations. To assess the current state, a regional expert team completed detailed screening and investigation of the existing forensic DNA data repositories and associated legislation in these countries. The scope also included relevant concurrent projects and a wide spectrum of different activities in relation to forensics DNA use. The state of forensic DNA analysis was also determined in the neighboring Slovenia and Croatia, which already have functional national DNA databases. There is a need for a ‘regional supplement’ to the current documentation and standards pertaining to forensic application of DNA databases, which should include regional-specific preliminary aims and recommendations.

UDK 630*6/.9(497.6) This paper deals with the forestry production cost analyses realised in Federation of B&H. The results of research point out on high differences of production costs between individual forest enterprises, caused by various ways of cost calculation, as well as by various production conditions. Therefore, the data obtained from enterprises are not comparable in whole, and as such, the data could not be used as the bases for calculation of an objective forestry production cost. To effect the activity based costing (e.g. activity of silviculture or forest utilization) is of particular importance. The used methodology is based on traditional costing, which is appropriate only for calculating direct costs, and not adequate to determine overhead (indirect) costs. Regarding these costing methods for calculating costs in forest enterprises, their performed forest activities are not appropriately valued. Today, as overhead costs are of considerable importance, the demand for more accurate costing methods has increased in the field of forest management. ABC (Activity Based Costing) method is a new dimension of cost analysis to record costs for each forest activities, towards objective forest management cost production determined. At the same time, it reveals the necessary costs for each activity, assures the proper layout of overhead costs to the forest activities. On the base of the defined forest activities for realization of forest management goals, as well as forest production capacities, we could understand the forest enterprises ability to achieve the goals and also to pay rent for using forest resources.

UDK 630*4:712(497.6 Sarajevo) This paper analyzes the health status of trees in the avenues of the city of Sarajevo. Special attention is paid to abiotic harmful influences, snow precipitation and mechanical damage of trees, as the initial factors of destabilization of their health status. Sarajevo area is characterized by a moderate continental climate occurring as a result of the influence of central European climate from the north and the Mediterranean climate from the south and of the variety of the terrain. This type of climate is characterized by hot summers and relatively cold winters. Because of severe thermal influence of the Adriatic Sea autumn is warmer than spring. Distribution of precipitation in Sarajevo is characterized by summer (primary) and autumn (secondary) peaks. Specific weather conditions in this area, in some years, result in early or late snowfall the consequences of which are damages of vegetation cover. The results of this research confirmed significant damages of the trees resulted from the adverse effects of snow in October 2009 (branches fractures, split of the stem and fracture of tree crowns). The resulting injuries are suitable openings for the penetration of rot causing microorganisms (fungi and bacteria) and colonization of insects which is why we can expect further deterioration in the health status of trees in the future. The paper suggests activities the implementation of which can reduce these harmful effects of biotic factors.

Properties of the Zagreb indices of pseudo-regular graphs are established, with emphasis on the Zagreb indices inequality. The relevance of the results obtained for the theory of nanomolecules is pointed out.