N. Krumov, A. Angelov, C. Posten
R. Nedkov, I. Ivanova, A. Shikalanov, N. Georgieva, M.
M. Dimitrova, E. Ivanova, V. Yanchev, K. Radeva, N. Stankova, R. Tsoneva
Renewable energy sources and biofuels
G. Notton, V. Lazarov, L. Stoyanov
I. Ivanov, A. Saravananakumar, K. Kumar, P. Kaleychev
OF YEAST STRAINS’ POTENTIAL TO ACCUMULATE CADMIUM IONS –
A PERSPECTIVE PATHWAY FOR FUTURE BIOTECHNOLOGICAL NANOPARTICLE FORMATION
Abstract. Nanoparticles’ unique properties and applications define the practical interest towards them and the consequent elaboration of different synthesis strategies. Understanding the process of biomineralization and the identification of microorganisms capable of producing nanoparticles under defined conditions, unveils new perspectives for the nanotechnology and facilitate its fusion with biotechnology. The main objective of the present scientific work was to compare selected biosynthetic and metabolic activities of yeast strains isolated from soil. As the bionanoparticle-formation mechanisms in yeasts are strain- and cultivation conditions-specific, the foreseen experiments aimed eventually to recognize and introduce new promising yeast strains with high potential for the synthesis of CdS bionanoparticles. Soil-isolated yeast strain designated as S. pombe NK05/2 demonstrated highest levels of specific cadmium accumulation – 8.8 and 13.75 mg.g-1 BDM (bio dry mass) for both media tested, and exhibit the best biosynthetic characteristics.
Keywords: nanoparticles, yeast, cadmium, biomineralization
ECOLOGICAL DYNAMICS OF
M. Lubenova, R. Nedkov, I. Ivanova, A. Shikalanov, N. Georgieva, M. Zaharinova, M. Dimitrova, E. Ivanova, V. Yanchev, K. Radeva, N. Stankova, R. Tsoneva(PDF 2077k)
Abstract: In this paper a study of forest vegetation
Key words: ecological dynamics, forest community,
satellites data, terrestrial data,
ANALYSIS OF PUMPED HYDROELECTRIC STORAGE FOR A WIND/PV SYSTEM FOR GRID INTEGRATION
G. Notton, V. Lazarov, L. Stoyanov(PDF 2118k)
Abstract: This paper deals with the pumping storage system analysis. The water reservoir serves for daily and seasonal energy storage, thus basically solving the problem of energy storage, which is the biggest problem of wider use of renewable energy sources. The electrical energy produced in excess by the renewable energy system is converted in potential energy by pumping water to a higher elevation where it can be stored indefinitely and then released to pass through hydraulic turbines and generate electricity. The estimation of the stored energy, the nominal electrical power of the hydroelectric plant and the evaporation rate of the water reservoir is presented.
Keywords: solar energy; wind energy; hybrid systems; pumped storage.
INITIAL RESULTS OF STUDIES AND POSSIBILITIES
FOR BIOMASS GASIFICATION IN
I. Ivanov, A. Saravananakumar, K. Kumar, P. Kaleychev(PDF 1090k)
Abstract. The use of biomass as energy source
has high priority in order to comply with the Kyoto
Protocol for global reduction of the greenhouse emission.
As result of scientific contacts and studies of