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The investigations regarding the use of plant extracts for their antimicrobial activity is becoming more intense nowadays. The goal of this paper was to evaluate the antimicrobial activity of several plant extracts in order to provide a better understanding of the essential role of the use of plant natural compounds as a primary source of antimicrobial products. Hydroalcoholic extracts of five medicinal plants were tested for their antimicrobial activity against Pythium sp. The plants considered for study were marigold (Tagetes patula), horsetail (Equisetum arvense), elderberry (Sambucus nigra), burdock (Arctium lappa) and liquorice (Glycyrrhiza glabra). The plant materials used for extractions were obtained from healthy dried plants collected from natural populations on non-polluted lands. The experiments demonstrated that plants possess strong antimicrobial activity and that plant based products can be effective in controlling microbial growth inhibition. Plant extracts may potentially control the growth and development of pathogenic microorganisms thus representing an alternative in plant protection management and human and veterinary medicine also.

Abstract.The present paper presents the screening of two yeast strains, for the obtainment of forage biomass from grape marc diffusion solution supplemented with wine yeast extract. The yeast strains used were Saccharomyces ellipsoideus originating from alcoholic fermentation, and a strain of Rhodotorula sp. Protein biosynthesis was monitored by determining the following parameters: alcohol concentration at the beginning and end of the process, the optical density of the culture medium, the residual sugar, and the wet and dry biomass. Better results were obtained for Rhodotorula sp. strain, and this can be explained by the presence of glucose which is a much better tolerated carbon source than the ethanol.