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    Wyświetlanie 1-11 z 11
    Tytuł:
    Antifungal activity of PLA foils covered with ethylocelulose containing essential oils
    Autorzy:
    Łopusiewicz, Łukasz
    Mizielińska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/1113918.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    active coatings
    antifungal properties
    essential oils
    Opis:
    The purpose of the research work was to examine the antifungal properties of cumin, rosemary and fennel essential oils. The goal of the study was also to determine antifungal activity of coatings containing the essential oils. The results of the study demonstrated that cumin, rosemary and fennel essential oils exhibited antifungal properties. The most sensitive strains were Botrytis cinerea and Mucor circinelloides. The cumin oil was found to be the most active. The growth of Botrytis cinerea and Mucor circinelloides was not observed even on medium containing 0.1% of cumin oil. The growth of Aspergillus niger, Aspergillus clavatus and Rhizopus oryzae was not noticed on mediums containig 0.5% of the oil. The similar results were obtained for fennel essential oil. 0.5% concentration of the oil in medium inhibited the growth of Botrytis cinerea, Mucor circinelloides, Aspergillus clavatus, Rhizopus oryzae. The rosemary oil did not inhibited the growth of fungi strains in concentration of 0,1%.
    Źródło:
    World News of Natural Sciences; 2017, 12; 27-32
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Polihydroksyalkanolany - obiecujące polimery biodegradowalne
    Polyhydroxyalkanoates - promising biodegradable polymers
    Autorzy:
    Mizielińska, Małgorzata
    Łopusiewicz, Łukasz
    Soból, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/1033731.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Przyrodników im. Kopernika
    Tematy:
    biopolymers
    microorganisms
    plastics
    polyhydroxyalkanoates
    biopolimery
    mikroorganizmy
    polihydroksyalkanolany
    tworzywa sztuczne
    Opis:
    W pracy omówiono polihydroksyalkanolany, biopolimery o ogromnym potencjale. Scharakteryzowano ich właściwości i zastosowanie, zwracając uwagę na takie ich zalety jak biozgodność (brak toksyczności w stosunku do organizmu), podatność na biodegradację, czy właściwości termoplastyczne, zbliżone do tworzyw sztucznych. Niestety, pomimo wielu zalet, PHA nie są powszechnie wykorzystywane, głównie ze względu na wysoki koszt ich wytwarzania i oczyszczania. Dlatego w celu obniżenia kosztów podejmuje się działania w kierunku zastąpienia podczas hodowli drobnoustrojów źródła węgla tanimi materiałami odpadowymi. Kolejnym sposobem zmniejszenia kosztów produkcji PHA jest wykorzystanie modyfikowanych genetycznie mikroorganizmów. Alternatywą może być także poszukiwanie nowych metod wyodrębniania biopolimeru z komórek. Dobrym pomysłem może być także łączenie chemicznych i mechanicznych metod oczyszczania PHA. PHA bardzo często wykorzystywane są w medycynie, zastępując tworzywa sztuczne, gdzie istotne są właściwości materiałów oraz ich podatność na biodegradację. Niestety, ze względu na cenę, do wytwarzania polimerowych przedmiotów użytku codziennego, polimery syntetyczne wykorzystywane są częściej.
    This paper discusses properties of polyhydroxyalkanoates (PHA), biopolymers with a huge potential for practical applications. PHA have a number of advantages such as biocompatibility (no toxicity for organism), biodegradability and thermoplastic properties similar to those of synthetic plastics. Unfortunately, despite these advantages PHA are not widely used owing to the high costs of their preparation and purification. Therefore, in order to reduce these costs efforts are being undertaken to replace traditional carbon sources for cultivation of microorganisms by cheaper waste materials. Another way to reduce the cost of PHA production is the use of genetically modified microorganisms. An alternative approach may be also a search for new methods for extraction of these biopolymer from the cells including combination of chemical and mechanical methods of purification. PHA are very often used in medicine, because of their properties and biodegradability. In this area they substitute plastics. Unfortunately, costs of production from PHA polymeric objects for everyday use are still too high, so synthetic polymers remain predominantly in use.
    Źródło:
    Kosmos; 2018, 67, 2; 299-306
    0023-4249
    Pojawia się w:
    Kosmos
    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
    Tytuł:
    Antibacterial activity of covered paper after storage
    Autorzy:
    Jarosz, Michał
    Sumińska, Patrycja
    Kowalska, Urszula
    Mizielińska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/1112792.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Staphylococcus aureus
    active coatings
    covered paper
    polylysine
    Opis:
    The paper covered with a hydrophobic Topscreen coating was coated with the second layer. The goal of paper covering was to obtain the antimicrobial properties of the external coating. The samples were stored 2 months at 20 ºC. The influence of storage on the antimicrobial properties of the external coating was analyzed. The results of the study showed that paper covered with Topscreen coating did not have an influence on the growth of Staphylococcus aureus cells. The second (external) layer containing 2% polylysine as an active substance decreased the growth of S. aureus. The 2 months storage of the covered paper did not influence the antimicrobial properties of coating with polylysine against S. aureus. It was demonstrated that paper covered with hydrophobic coating had no influence on the growth of E. coli cells as well. In this case the influence of 2 months storage on the antimicrobial properties of the coating with polylysine was observed. In contrast to the results obtained for the samples that were not store, the decrease of the growth of the bacterial cells after 24 h contact with a hydrophobic coating devoid of an active substance was noticed.
    Źródło:
    World News of Natural Sciences; 2018, 17; 141-146
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of oxygen and humidity on storage of freeze-dried Lactobacillus gasseri in relation to water activity and viability
    Autorzy:
    Stobińska, Magdalena
    Sobecka, Katarzyna
    Jarosz, Michał
    Urbański, Dawid
    Mizielińska, Małgorzata
    Łukawska, Barbara
    Olchawa, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/1178343.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    freeze-drying
    probiotics
    water activity
    Opis:
    Lactic acid bacteria have shown positive health effects and are widely distributed as dry products. They are widespread applied in functional dairy products, dietary supplements and as pharmaceutical products. Freeze-drying is a process of removing water by sublimation and is one of the most effective preservation technology. The aim of the present study was to establish impact of oxygen and humidity on freeze-dried Lactobacillus gasseri during the preparation of the powder and storage time. Lyophilisate was rubbed in aerobic and anaerobic condition with low humidity. Survival test and water activity was investigated after freeze-drying and storage in two different temperatures. The preservation of bacteria was improved when after freeze-drying process lyophilisate have not contact with oxygen and humidity. Survival rates of bacteria was the highest during storage at anaerobic condition both at 4-6 °C and 25 °C. The results shown that it is sufficient to crush of freeze-dried and packaged under anaerobic conditions to achieve higher survival of bacteria.
    Źródło:
    World Scientific News; 2017, 81, 2; 305-310
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of whey on viability of Lactobacillus gasseri during freeze-drying process
    Autorzy:
    Urbański, Dawid
    Jarosz, Michał
    Stobińska, Magdalena
    Sobecka, Katarzyna
    Mizielińska, Małgorzata
    Łukawska, Barbara
    Olchawa, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/1179192.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    freeze-drying
    lactic acid bacteria (LAB)
    whey
    Opis:
    Probiotic bacteria have positive impacts on a numerous of physiological functions including immunomodulation and also on prevention of various intestinal diseases. However, acidic environment of the stomach and heavy conditions of freeze-drying process decrease survival of these bacteria. There are necessary researches on cheap raw materials that increase cell protection. The aim of the present study was to determine the impact of whey and other compounds on survival Lactobacillus gasseri during the freeze-drying process and storage. There were prepared culture media for cell protection during lyophilisation, which contained a variety of mixture whey, skim milk, sucrose, starch, maltodextrin and whey protein. Lyophilisate was rubbed in aerobic and anaerobic condition with lower humidity. Survival tests were investigated directly after freeze-drying process and then periodically during storage under refrigeration. Within 6 months of storage bacterial viability was similar in the samples containing liquid whey except for media containing starch. The results of viability did not deviate than those obtained with using the reference medium, which contains skim milk and sucrose. This shows that the liquid whey may be successfully used to protect the lactic acid bacteria during lyophilisation. Moreover, the use of whey can reduce the amount of waste produced in the dairy industry.
    Źródło:
    World Scientific News; 2017, 83; 200-205
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of immobilization and packaging on the viability of probiotics stored at 25 °C
    Autorzy:
    Mizielińska, Małgorzata
    Sobecka, Katarzyna
    Jarosz, Michał
    Urbański, Dawid
    Stobińska, Magdalena
    Łukawska, Barbara
    Olchawa, Ewa
    Bartkowiak, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/1178352.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    cocoa butter
    encapsulation
    immobilization
    packaging
    probiotics
    Opis:
    The goal of the study was to determine the influence of encapsulation, immobilization conditions and packaging on microorganisms survival. The results of the study demonstrated that L. gasseri, L. plantarum, and L. rhamnosus as probiotics could be added to food products as lyophilized cells if the end product was stored at 25 °C for no longer than 3 months. It was shown that L. plantarum and L. rhamnosus as food additives could be stored 6 months in room temperature, only if the cells were encapsulated or if the end product was packed in MAP. It was proved that the number of probiotics immobilized in the chamber was higher than the number of bacteria immobilized at aerobic conditions with higher relative humidity. Cocoa butter, presented in this study could be used as an immobilization carrier due to its hydrophobicity.
    Źródło:
    World Scientific News; 2017, 77, 2; 124-143
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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