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Recent Submissions
Nutritional composition of Abies x borisii-regis Mattf. cones from Bulgaria
(Plovdiv University Press "Paisii Hilendarski", 2026-04-08) Mladenova, Vasilena; Radoukova, Tzenka; Ivanova, Miroslava; Dospatliev, Lilko; Mladenov, Rumen; Stoyanov, Plamen; Mladenova, Tsvetelina; Todorov, Krasimir; Gyuzeleva, Donika
In this study, a proximate analysis and determination of the mineral content of Abies x borisii-regis cones from Bulgaria were carried out in connection with their potential use in the pharmaceutical industry. A. x borisii-regis cones showed to be rich in carbohydrates (79.06 g 100-1 g-1 dw), which were the most abundant macronutrients. The proteins in the A. x borisii-regis cones averaged 11.19 g 100-1 g-1 dw. The total energy content in the A. x borisii-regis cones is relatively high 1665.10 g-1 dw. The obtained data on the content of trace elements in the cones of A. x borisiiregis show the highest content of Fe (137.03 mg kg-1), followed by Mn (95.7 mg kg-1) and Zn (70.06 mg kg-1). The results of the proximate analysis of the cones of Tsar Boris fir, as well as the total content of trace elements, suggest the possibility of their direct use in pharmaceuticals and dietetics.
Мonthly fluctuations in litterfall in forest communities, part of the LTER-BG network
(Plovdiv University Press "Paisii Hilendarski", 2026-04-10) Dimitrova, Violeta; Damyanova, Sonya
Litterfall is a crucial component of forest ecosystems that links the tree canopy and soils. It is one of the indicators that must be monitored in the sites of the “Bulgarian Network for Long-Term Ecosystem Research - LTER BG”, which is a part of the “European Network for Long-Term Ecosystem Research”. The present study aimed to determine the production of total litterfall and its components (leaves, flowers and fruits, branches and seeds) and their monthly fluctuations at beech and spruce ecosystems situated at different altitudes. Litterfall quantities were studied in three sample plots in beech and spruce forests in the Balkan Mountains, located in sites of the LTER BG network. The monthly dynamics of deciduous forest show, as expected, the highest amounts of litterfall during the autumn months, with the leaf fraction dominating, followed by the cupulas and seeds. The average annual amount for beech forests was 506.5 g.m-2. In spruce forests, the annual amount was 623.28 g.m-2, with the largest percentage being needles, followed by cones and branches. The annual dynamics of litter in spruce forests show the presence of litter in all months of the year with a predominant fraction of needles. The difference in altitudes determines the monthly variations in litter fractions in beech forests. Further studies can continue with the study of the chemical composition of the litterfall in order to clarify the cycling of elements.
Three millennia of vegetation history in the Vitosha Mountain, Bulgaria
(Plovdiv University Press "Paisii Hilendarski", 2026-03-18) Tonkov, Spassimir; Marinova, Elena; Gyurova, Dessislava
Pollen analysis supported by radiocarbon dating was performed on a core collected from a peat bog in the central plateau area of the Vitosha Mountain. The palynological data provides information on the vegetation changes over the last three millennia. Between 3000 and 800 years ago forests of Picea abies with some Pinus sp. and less Abies alba dominated on the high slopes of the mountain. Below them were distributed forests of Fagus sylvatica and mixed oak communities with Carpinus betulus, C. orientalis, while Corylus was found on open terrains. In the time interval 800-560 cal. yrs. BP (1150-1400 AD) the spruce forests declined alongside with a slight increase for beech. By that time, the first signs of human activity are justified by an increase for Poaceae, Artemisia, Chenopodiaceae, Cirsium, Plantago lanceolata, Rumex and Juniperus, which points to partial deforestation, forest fires and acquisition of new pasture land. The last centuries witnessed the fragmentation of Picea abies forests, the disappearance of Abies alba, and intensification of the human interference in the vegetation cover particularly on the southern slopes.
Color-based analytical assessment of microplastic contamination in surface waters from the Black Sea (Bulgaria)
(Plovdiv University Press "Paisii Hilendarski", 2026-03-14) Yancheva, Vesela; Stoyanova, Stela; Georgieva, Elenka; Valkanov, Kiril
Microplastic (MP) contamination in surface waters is a growing environmental concern; however, information on MP color and size distribution in the Black Sea remains limited. This pilot study examined surface water samples from five coastal sites along the Bulgarian Black Sea coast. The findings establish baseline data on MP color and size characteristics and underscore the need for further research into the environmental behavior and management of colored MPs.
Contribution to the study of the free-living freshwater nematodes from Vodas River, Edessa, Greece
(Plovdiv University Press "Paisii Hilendarski", 2026-03-15) Stoichev, Stefan
Hydrobiological studies of Vodas River in Edessa, Greece were performed in 2022. The present study provides the first information on free-living freshwater nematodes from Voda River in Edessa, Greece. In our study, we identified 7 species of freshwater free-living nematodes belonging to 6 genera. This is the first detailed study on free-living freshwater nematodes from the Vodas River in Edessa, Greece. The 3 species (marked by +) and 2 genera (marked by *) are new to the hydrofauna of Greece.