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    Wyświetlanie 1-5 z 5
    Tytuł:
    Bioconversion of crude glycerol to 1,3-Propanediol by immobilized cells of Citrobacter freundii
    Autorzy:
    Kowalska, Urszula
    Mizielińska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/1179223.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    1
    3-PD
    Citrobacter freundii
    bioconversion
    crude glycerol
    immobilization
    keramsite
    Opis:
    1,3-Propanediol (1,3-PD) was produced from crude glycerol through the fermentation by immobilized Citrobacter freundii cells. Microorganisms were immobilized on keramsite. and transferred to fermentation broth “M” with 50g/L glycerol. In parallel, conversion of glycerol was led in two bioreactors: column bioreactor for continuous production and standard bioreactor for static culture at the same conditions. The obtained results have shown that the use of immobilized cells of C. freundii reduced concentration of crude glycerol about 60%. The results have also demonstrated that immobilization was appropriate process for production of 1,3-PD in both continuous and static (bioreactor) conditions.
    Źródło:
    World Scientific News; 2017, 80; 18-28
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The continuous bioconversion of glycerol to 1,3-PD by using encapsulated C. freundii cells
    Autorzy:
    Kowalska, Urszula
    Mizielińska, Małgorzata
    Soból, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/1178073.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    PDADMAC beads
    alginate capsules
    bioimmobilization
    encapsulation
    Opis:
    The aim of the work was to decrease the costs of bioconversion process by using chip and simple chromatographic columns containing immobilized C. freundii cells during fermentation. The goal was also modification of medium to control of pH of process in these columns. The purpose of the study was also to ascertain the new systems of biopolymers used for encapsulation of bacterial cells. The stability of obtained membranes in different mediums has been examined. The waste glycerol conversion to 1,3-PD over continuous process has been analyzed as well. The results of the study showed that the double crosslinked alginate beads are better carriers than alginate capsules coated by chitosan during conversion of waste glycerol to 1,3-PD. Unfortunatrly these two kinds of capsules should not be used for continuous process and repeated bioconversions because of low mechanical properties of the beads. PDADMAC beads and modified (e.g. by additions) PDADMAC capsules should not be used for continuous and repeated bioconversions as well.
    Źródło:
    World Scientific News; 2018, 95; 193-214
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of PU foams modification on the efficiency of Citrobacter freundii cells immobilization
    Autorzy:
    Mizielińska, Małgorzata
    Kowalska, Urszula
    Łopusiewicz, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1178364.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Citrobacter freundii
    bacterial adhesion
    bioimmobilization
    polyurethane foam
    Opis:
    The purpose of the study was to modify PU (polyurethane) foams to increase the efficiency of Citrobacter freundii cells adhesion. The immobilization can contribute to better productivity during the bioconversion of glycerol to 1,3-propanediol (1,3-PD). The results of the study showed that C. freundii immobilized on foams with organic additives could decompose more glycerol and produce more 1,3-PD than cells immobilized on pure foams. The immobilization made production in long-term operations or repeated runs possible. The results of the experiments have also proved that the foams with additives, especially with wood chips and peanut shells, would be the most suitable carriers because they allow the immobilization of a higher number of bacterial cells. It was demonstrated that the initial number of C. freundii cells in all samples (before incubation) was 1.2×106 CFU/mL. The results showed that the accumulation of bacterial cells in the control sample with pure PUF (polyurethane foams) was 1.5×107 CFU/mL after 24 hours of incubation (the number of bacterial cells attached to surface of foams). It was determined that the accumulation of bacterial cells in samples with 15% of additives at 30 °C increased to 2.17×107/ 3.37×107/ 1.25×108/ 1.65×108/ 5.65×107 CFU (PUFbtb, PUFab, PUFwch, PUFps, PUFrc) CFU/mL after 24 hours of incubation.
    Źródło:
    World Scientific News; 2017, 77, 2; 211-225
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of petroleum hydrocarbons adsorbtion and biodegradation by Pseudomonas aeruginosa cells entrapped into silica-alginate beads
    Autorzy:
    Mizielińska, Małgorzata
    Kowalska, Urszula
    Łopusiewicz, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1179265.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Pseudomonas aeruginosa
    biodegradation
    bioimmobilization
    encapsulation
    petroleum hydrocarbons
    Opis:
    The aim of the work was to elaborate new method of wool entrapping into silica alginate beads and checking of their adsorption properties. The purpose of the present study was also to determine water bioremediation efficiency using Pseudomonas aeruginosa cells immobilized into wool entrapped into silica-alginate beads. The results of study showed that obtained capsules are stable in saline water environment. Additionally neither silica adsorbers nor wool impacted negatively on viability of bacterial strains that were entrapped into these capsules. Moreover, it should be underline that 83,01% of adsorbed engine oil has been degraded by immobilized microorganisms after 3 months of biodegradation process. The results proved that properties and non-toxic character of these beads are suitable enough to use them in purification of water from petroleum hydrocarbons.
    Źródło:
    World Scientific News; 2017, 80; 256-267
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lactobacillus casei cell immobilisation on mineral carriers for continuous lactic acid production
    Autorzy:
    Kowalska, Urszula
    Mizielińska, Małgorzata
    Łopusiewicz, Łukasz
    Bartkowiak, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/1178777.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Lactobacillus casei
    adsorption
    biofilm
    continuous production
    immobilisation
    lactic acid
    mineral carriers
    Opis:
    The first purpose of the study was to evaluate the influence of incubation parameters for efficiency of bacterial adhesion on surface of three solid, mineral porous carriers. Second aim of the study was the use of the immobilized Lactobacillus casei cells, in the production of lactic acid and selection, best carriers for continuous production using column bioreactor. The results showed that bacterial adhesion was different depending on the incubation conditions. In all tested samples, the highest efficiency of bacterial adhesion achieved after incubation at 30 °C without shaking which was related to bacterial viability. The results showed that, the highest efficiency of lactic acid production by free cells has been obtained at 30 °C after 48h – 110% (w/w) (lactic acid yield from consumed glucose). This results have been confirmed by further tests which have shown that in stationary culture, the highest production of lactic acid was reached by immobilised bacteria cells on pumice and kermiste after 48 hours at 30 °C.
    Źródło:
    World Scientific News; 2017, 90; 62-76
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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