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Ljubljana, Slovenia

Brus R.,Biotechnical Faculty | Idzojtic M.,University of Zagreb
Plant Biosystems | Year: 2011

In most European countries, the service tree (Sorbus domestica L.) is a rare and threatened species and its conservation has been recognised as a priority. The aim of this study was to asses its morphologic variation in the western and central part of the Balkan Peninsula and in southern Central Europe. Three populations were analysed: one in Serbia, one in Bosnia and Herzegovina and one in Slovenia. In each population 30 trees were selected, and from each tree 30 leaves were collected for morphometric analysis based on nine leaflet morphological traits. Univariate (ANOVA) and multivariate (MANOVA) analysis of variance were used to estimate the variation within- and between populations and a discriminant analysis was performed to examine the structure of the between-population differences. The values of particular morphological traits found in our study did not differ considerably from the values reported elsewhere. The results revealed significant within- and between population variation. Variation within populations was highly significant for all the scored leaf morphological traits, while variation between populations was significant for all the studied traits except for the leaflet length. The discrimination between the three populations was significant. High percentages of correctly classified samples demonstrate good discriminating employability of the analysed leaf morphological traits and indicate differentiation of the analysed populations. © 2011 Società Botanica Italiana. Source

Bohinc T.,Zgornja Lipnica 9a | Trdan S.,Biotechnical Faculty
Journal of Food, Agriculture and Environment | Year: 2012

In 2009 and 2010, a field experiment was carried out to determine the effect of three trap crops (oil radish, oil rape and white mustard) as a protection method against cabbage stink bugs (Eurydema spp.) and flea beetles (Phyllotreta spp.) attack on two hybrids of white cabbage. The experiment was designed as randomized complete block with four treatments. The damage caused by cabbage stink bugs and flea beetles on the main crop and the trap crops was estimated in 10-day intervals. Oil rape was the most attractive trap crop for cabbage stink bugs, while flea beetles displayed specific preference to oil radish as a trap crop in 2010. Flea beetles displayed specific preference for oil radish as a trap crop in 2010, while they did not display specific preference to any of trap crops tested in 2009. The damage caused by cabbage stink bugs on cabbage started increasing in the beginning of July. The damage caused by flea beetles, on the other hand, started increasing at the end of May. Cabbage hybrid 'Hinova' was more heavily attacked by both groups of the pests, mostly due to its longer growth period. The extent of damage on cabbage and trap crops was higher in the second year, since before 2009 no Brassica crops were grown in the near vicinity of the experimental plot. The trap crop species has no important effect on the yield of cabbage, since the pests on trap crop plants were not control with insecticides. Source

Modic M.,Jozef Stefan Institute | Junkar I.,Jozef Stefan Institute | Stana-Kleinschek K.,University of Zagreb | Kostanjsek R.,Biotechnical Faculty | Mozetic M.,Jozef Stefan Institute
Plasma Processes and Polymers | Year: 2014

Improved hemocompatibility from the perspective of platelets adhesion and activation on polyethylene terephthalate surfaces has been addressed. The activation stage of platelets has been determined from their size and morphology using scanning electron microscopy (SEM). The activation of platelets on untreated polymer materials was very intensive. Polymer materials were treated with weakly ionized oxygen plasma in order to repel platelet adhesion. Already short treatment times (3s) showed significant reduction of the total number and of highly activated forms of adhered platelets. Possible mechanisms of different behaviour of blood platelets on plasma treated polymer were discussed in terms of surface adhesion and changes in morphology. RF oxygen plasma treatment is used for surface modification of polyethylene terephthalate polymer surface. Newly acquired surface properties analyzed with XPS, WCA, and AFM show significant improvement of hemocompatibility. In contact with whole human blood, SEM images revealed reduced number of activated adhered platelets on the surface of plasma treated polymer. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Cojzer M.,ZGS | Brus R.,Biotechnical Faculty
Sumarski List | Year: 2010

In Slovenia, as well as in others parts of Europe, the share of abandoned agricultural land overgrown by forest has been increasing every year. This article deals with this process of succession in Haloze, in the northeastern part of Slovenia. The main aim of this research was to find out how much of the abandoned agricultural land on the studied area has succeeded to forest in the last 20 years, to examine differences in species composition and the density of individuals of tree and shrub species between abandoned areas and younger developmental phases of forest, as well as to point out the strategies of succession on abandoned areas and compare them with the vegetation process of younger developmental phases in forest. Forest area increased by 7% in the period from 1985 to 2005 in the study region. The results show that the successional process on abandoned land starts with shrub species, while in younger phases of forest, tree species prevail entirely. Source

Poljansek S.,Slovenian Forestry Institute | Ballian D.,University of Sarajevo | Nagel T.A.,Biotechnical Faculty | Levanic T.,Slovenian Forestry Institute
Tree-Ring Research | Year: 2012

We describe the development of the first black pine (Pinus nigra Arnold) regional chronology for the central-western Balkan area, Bosnia and Herzegovina (BiH), based on seven site chronologies from different parts of the country. Pointer-year analysis identified a common signal (possibly climate) in the site chronologies - at least five positive (1876, 1930, 1941, 1969) and nine negative pointer years (1874, 1880, 1891, 1931, 1943, 1963, 1971, 1987, 2000) are common to all seven study sites. Site chronologies were compared using statistical parameters and visual crossdating, from which we constructed a 435-year-long tree-ring width chronology for P. nigra for BiH and compared it with existing P. nigra chronologies from Montenegro, Greece, Albania, Austria (Vienna region), and France (Corsica). The resulting statistical and visual similarity indicated that the chronology has a strong regional signal and therefore can be included in the dendrochronological network for P. nigra for the Western Balkans. © 2012 the Tree-Ring Society. Source

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