Facultatea de Biologie și Geoştiinţe / Faculty of Biology and Geosciences

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End date: 2024Subject: search.filters.subject.Cyanobacteria cultivation

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    THE INFLUENCE OF SOME MINERAL FERTILIZERS ON THE ACTIVITY OF THE CYANOBACTERIA NOSTOC LINCKIA AND NOSTOC PUNCTIFORME
    (Tipografia Artpoligraf, 2021) Dudnicenco, Tatiana
    Cyanobacteria are numbered among the organisms that have a clear role in soil fertility. The aim of this research was to assess the influence of mineral fertilizers, frequently used for the soils in the Republic of Moldova, on the activity of the cyanobacteria species Nostoc linckia (Roth.) Born. and Flah. and Nostoc punctiforme (Kützing) Hariot.The o bjectives of the investigations were: to study the morphological and physiological-biochemical particularities of the sestrains of Nostoc; to identify the factors that regulate the irnitrogen-fixing activity, increasing their productivity, enriching soil with organic substances and nitrogen; to study the possibility of using the se species as biological indicators; to determine the rates of the fertilizers that can be used without endangering the activity of the sesoil cyanobacteria.
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    PROCEDURES OF OBTANING OF EXOPOLYSACCHARIDES PRODUCED BY CYANOBACTERIA SPIRULINA (ARTHROSPIRA) PLATENSIS AND NOSTOC LINCKIA
    (Universitatea din Oradea, 2018) Bulimaga, Valentina; Zosim, Liliana; Trofim, Alina; Pisova, Maria
    The dynamics of accumulation of total and acidic (sulfated) exopolysaccharides (EPS) produced by cyanobacteria Spirulina platensis and Nostoc linckia under the action of some chemical regulators at the two steps cultivation with the increasing of light at the second step were established. Procedures of EPS isolation from cyanobacteria Spirulina platensis and Nostoc linckia and the scheme of EPS production, obtaining and quantification have been developed. The synthesis of sulfated exopolysaccharides (till 91 mg/l) at the cultivation of spirulina in two stages was positively influenced by the variation of the light regime and the addition of carbon source with or without addition of Na2SeO3. Supplementing of the nutrient medium with sodium selenite (2 mg/l) and varying of light to 2500 lx in the 7th day of cultivation of cyanobacteria Nostoc linckia led to a maximum increasing in the amount of total and acidic exopolysaccharides (477 and 422 mg/g, respectively).
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    PROCEDURE FOR OBTAINING CHROMIUM FOOD BIOADDITIVE
    (Universitatea din Oradea, 2018) Bulimaga, Valentina; Zosim, Liliana; Elenciuc, Daniela; Crivoi, Aurelia; Bacalov, Iurie
    A study of the [Cr(Gly)3]Cl effect on the biochemical composition of the cyanobacterium Spirulina (Arthrospira) platensis has been carried out at cultivation depending on the lighting regime and the timing of addition of this compound. Its positive effect on protein content (including peptides) was established within the concentration limits of up to 30 mg /l. Chromium accumulation was more efficient in light/dark photoperiod (14/10 hours) in case of supplementation on the 1st and 3rd days in the portions. The technological scheme for obtaining chromium bioadditive was proposed. This procedure is based on using a Cr(III) glicinate as source of Cr(III) for obtaining of spirulina biomass enriched with chromium (0,75%) and valuable bioactive substances.