R. Tsvetkova

Publications10
h-index5
Citations119
Highly Influential Citations8
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Pharmacological activities and biologically active compounds of Bulgarian medicinal plants.
Bulgarian medicinal plants, which have been studied during the last years, are reviewed. The review includes the following families: Amaryllidaceae, Asteraceae, Berberidaceae, Boraginaceae, Fabaceae,…
Some allometric and non-allometric relationships between chlorophyll-a and abundance variables of phytoplankton
TLDR
The frequently investigated relationship between chlorophyll-a and biovolume ranged from statistically notsignificant in the mesotrophic to highly significant in the eutrophic reservoir, and this tendency was generalized by obtaining a statistically significant rank correlation between the levels of significance of chlorophyLL-biovolumes correlations and the corresponding chlorophyill-a concentrations.
Evaluation of antioxidant activity in some Geraniacean species.
Methanol extracts of nine species of Geraniaceae, namely G. sylvaticum L., G. sanguineum L., G. columbinum L., G. caeruleum Schur, G. pyrenaicum Burn.fi ll, G. lucidum L., G. marcorrhizum L., G.…
Alkaloids from Sternbergia colchiciflora
TLDR
The alkaloid pattern during both periods of leaf development and fructification was dominated by haemanthamine-type in the leaves and lycorine-type compounds in the bulbs, respectively.
Distribution of flavonoid aglycones in tribe Anthemideae (Asteraceae).
Characterisation of Collagenolytic Enzymes Produced by Thermophylic Actinomycetes
TLDR
Preliminary experiments show that proteolytic enzymes produced by extremophilic microorganisms in soil samples, collected from different regions in Bulgaria could be applied for pre-treatment of collagen-rich raw materials, e.g. in the pelt industry.
[A method of determining polyether antibiotics].
[Isolation, purification and separation of the antibiotics produced by Streptomyces hygroscopicus IM-110-81 (DIKLS)].
[Taxonomic studies of Streptomyces hygroscopicus strain IM-110-81 (DIKLS)--producer of a polyether antibiotic complex].
[The dissociation of a mutant strain of Streptomyces levoris 41-08, a producer of ichthiomycin].
TLDR
The statistical processing of data shows that the oligospore and the asporogene variants with their limits of activity to 121.8 and 119.3% respectively are promising, while the existence of white representatives in the population is not recommended since they are low-active minus variants.