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    Wyświetlanie 1-6 z 6
    Tytuł:
    Chromatograficzne metody oczyszczania polisacharydów grzybowych
    Purification of fungal polysaccharides using chromatographic methods
    Autorzy:
    Osińska-Jaroszuk, M.
    Jarosz-Wilkołazka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2071688.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    epoksypolisacharydy grzybowe
    Ganoderma planatum
    chromatografia
    fungal exopolysaccharides
    Opis:
    Celem pracy było opracowanie metody pozyskiwania i oczyszczania zewnątrzkomórkowych polisacharydów ze szczepu Ganoderma applanatum z wykorzystaniem metod chromatograficznych. Surowy preparat polisacharydu poddawano analizie chromatograficznej z wykorzystaniem nośników Sepharose 6B lub Sepharose CI-4B uzyskując trzy symetryczne piki elucji. Frakcje polisacharydowe nie wykazywały absorbancji przy długości fali 280 i 260 nm co świadczy o braku białek i kwasów nukleinowych w badanych substancjach.
    The aim of this work was to study the production of exopolysaccharides from Ganoderma applanatum and the description of chromatographic methoc purification of fungal polysaccharides. Crude polysaccharides were fractionated using preparative Sepharose 6B or Sepharose CI-4B chromatography obtain three fractions, which were selected on the total carbohydrate elution profile. Polysaccharides fractions had no absorbance at 280 and 260 nm UV spectrum, indicating the absence of proteins and nucleic acids.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2012, 4; 162-163
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of nutrient and stress factors on polysaccharides synthesis in Proteus mirabilis biofilm
    Autorzy:
    Moryl, Magdalena
    Kaleta, Aleksandra
    Strzelecki, Kacper
    Różalska, Sylwia
    Różalski, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/1039353.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Proteus mirabilis
    exopolysaccharides
    biofilm
    nutrient
    stress factors
    Opis:
    The extracellular matrix in biofilm consists of water, proteins, polysaccharides, nucleic acids and phospholipids. Synthesis of these components is influenced by many factors, e.g. environment conditions or carbon source. The aim of the study was to analyse polysaccharides levels in Proteus mirabilis biofilms after exposure to stress and nutritional conditions. Biofilms of 22 P. mirabilis strains were cultivated for 24, 48, 72 hours, 1 and 2 weeks in tryptone soya broth or in modified media containing an additional amount of nutrients (glucose, albumin) or stress factors (cefotaxime, pH 4, nutrient depletion). Proteins and total polysaccharides levels were studied by Lowry and the phenol-sulphuric acid methods, respectively. Glycoproteins levels were calculated by ELLA with the use of selected lectins (WGA and HPA). For CLSM analysis dual fluorescent staining was applied with SYTO 13 and WGA-TRITC. In optimal conditions the levels of polysaccharides were from 0 to 442 μg/mg of protein and differed depending on the strains and cultivation time. The agents used in this study had a significant impact on the polysaccharides synthesis in the P. mirabilis biofilm. Among all studied components (depending on tested methods), glucose and cefotaxime stimulated the greatest production of polysaccharides by P. mirabilis strains (more than a twofold increase). For most tested strains the highest amounts of sugars were detected after one week of incubation. CLSM analysis confirmed the overproduction of N-acetyloglucosamine in biofilms after cultivation in nutrient and stress conditions, with the level 111-1134%, which varied depending on the P. mirabilis strain and the test factor.
    Źródło:
    Acta Biochimica Polonica; 2014, 61, 1; 133-139
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasound conditioning of Streptococcus thermophilus CNRZ 447: growth, biofilm formation, exopolysaccharide production, and cell membrane permeability
    Autorzy:
    Khadem, H.
    Tirtouil, A.M.
    Drabo, M.S.
    Boubakeur, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2096999.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Streptococcus thermophilus
    ultrasound conditioning
    bacterial adhesion
    biofilm
    exopolysaccharides
    Opis:
    Sonication is one of the new and innovative approaches that is being increasingly used in food industry to control fermentation processes and to eradicate spoiling. Recently, this approach has seen new industrial applications such as enhancing microbial productivity. The present study aimed to assess the effects of ultrasound conditioning on the metabolism and extracellular matrix production of Streptococcus thermophilus. Bacterial suspensions were treated in ultrasonic bath (35 kHz, 240/60 W peak/nominal power, 1.8 l capacity) for different time periods (5, 10, 15, 20, 30, 45, and 65 min), and the growth improvement, adhesion ability, biofilm formation, and exopolysaccharide production of the bacterial strain were measured. The bacterial strain exhibited resistance to the treatment, and the conditioning improved the growth, adhesion, membrane permeability, biofilm formation, and exopolysaccharide production ability. An optimal treatment was obtained for 30 minutes of conditioning. An excellent yield of desirable exopolysaccharides (1788 mg glucose equivalent/l) was achieved. Ultrasound conditioning may be used as a potential approach to enhance certain biotechnological properties of industrial microorganisms.
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 2; 159-165
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In situ-formed bacterial exopolysaccharide (EPS) as a potential carrier for anchorage-dependent cell cultures
    Autorzy:
    Komorowski, Piotr
    Kołodziejczyk, Agnieszka
    Makowski, Krzysztof
    Kotarba, Sylwia
    Walkowiak, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/1844871.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    bacterial exopolysaccharides
    dextran- -based “microcarriers”
    scanning electron microscopy
    atomic force microscopy
    roughness parameters
    three-dimensional cell culture
    Opis:
    The study involved the use of a bacterial strain isolated from environmental samples which produce the biopolymer in the form of pellets in the submerged culture. This material (bacterial exopolysaccharide) is produced by bacteria of the Komogateibacter xylinus which are prevalent in the environment. The aim of this study was to characterize bacterial exopolysaccharides and commercial dextran-based “microcarriers” in terms of their roughness and cell culture effects, including the morphology and viability of the human hybridoma vascular endothelial cell line EA.hy926. The pellets were characterized using scanning electron microscopy (SEM) and atomic for¬ce microscopy (AFM). The resulting structures were used for cell culture of adherent cells (anchorage¬-dependent cells). At the same time, the cultures with commercial, dextran-based “microcarriers” were carried out for comparative purposes. After com¬pletion of the cell culture (24 hours of culture), the cellulose and commercial “carriers” were analyzed using SEM and AFM. Finally, the obtained cell dens¬ities (fluorescence labelling) and their morphological characteristics (SEM) were compared. The obtained results strongly support the applicability of bacterial exopolysaccharide (EPS) in tissue engineering to build innovative 3D scaffolds for cell culture, the more so that it is technologically possible to produce EPS as spatially complex structure
    Źródło:
    Engineering of Biomaterials; 2021, 24, 159; 18-23
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth and heavy metals uptake by Vicia faba in mining soil and tolerance of its symbiotic rhizobacteria
    Autorzy:
    El Alaoui, Abdelkhalek
    Bechtaoui, Noura
    Benidire, Loubna
    El Gharmali, Abdelhay
    Achouak, Wafa
    Daoui, Khalid
    Imziln, Boujamaa
    Oufdou, Khalid
    Powiązania:
    https://bibliotekanauki.pl/articles/207731.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    heavy metals
    mining soil
    exopolysaccharides
    rhizobacteria
    bean Faba
    metale ciężkie
    gleba górnicza
    egzopolisacharydy
    ryzobakterie
    fasola Faba
    Opis:
    Faba bean plants in the 1/8 mixture with soil had the ability to accumulate Pb, Zn and Cu. 95% of the absorbed Pb were in the roots, and Cu and Zn were found in the shoots by 35% and 45%, respectively. There was a decrease in the root hairs and the number of cell layers of the root cortex alongside epidermis lesions. From the 50 tested rhizobacterial strains, 20 were able to grow at 150 mg/dm3 of Pb, 6 were resistant to 150 mg/dm3 of Zn and 8 resisted to 20 mg/dm3 of Cu. Best four strains had adsorption potentials and the biosorption was higher for Cu. These strains were capable of producing auxin and exopolysaccharides. The most tolerant strains (FD1 and FD2) isolated near the mining site produced siderophores and high amounts of exopolysaccharides. The use of such strains and V. faba could be of important biotechnological value in decreasing heavy metal pollution of mining soils.
    Źródło:
    Environment Protection Engineering; 2019, 45, 1; 83-96
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Egzopolisacharydy bakteryjne : budowa i funkcje
    Bacterial exopolysaccharides : structure and functions
    Autorzy:
    Samaszko-Fiertek, J.
    Kuźma, M.
    Dmochowska, B.
    Ślusarz, R.
    Madaj, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/172244.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    egzopolisacharydy
    kwas hialuronowy
    celuloza bakteryjna
    dekstran
    żelan
    ksantan
    exopolysaccharides
    hyaluronic acid
    bacterial cellulose
    dextran
    gellan
    xanthan
    Opis:
    Exopolysaccharides fulfil protective functions and allow bacteria live in the communities, single or mixed, by facilitating adhesion to surfaces and to each other. Microbes prefer to exist in the form of a biofilm. The term biofilm was introduced in 1978 and is the group of microorganisms surrounded by extracellular, highly hydrated mucus, which allows adhesion on various surfaces and adhesion of cells to each other [1]. The extracellular slime owes its character mainly due to the presence of exopolysaccharides. Bacteria living in biofilms, have a high resistance to external factors, such as changes in temperature, pH, humidity, oxygenation, presence of bacteriocins, antibodies or antibiotics. They may be up to 1,000 times more resistant to antibiotics than planktonic forms. They can be synthesized inside and outside bacteria cell. The structure of the bacterial exopolysaccharide is very diverse, but very often, due to the presence of uronic acid residues, or non-sugar organic acids as pyruvic acid, succinic acid, as well as residues of inorganic acids such as phosphoric acid or sulfuric acid, they are negatively charged particles. In addition, a characteristic of most of the exopolysaccharides (EPS) is their enormous molecular mass of up to several million g/mol [11]. Thanks to its rheological properties, ease of isolation, and often biodegradable antioxidant activity extracellular polysaccharides are increasingly used in industry as a gelling agents, hardening and thickening agents, emulsifiers, food coatings and pharmaceutical products. In addition, they can be used as bandages, anti-cancer agents, cholesterol-lowering, antiulcer or immunomodulators [20–27]. This article discusses in details the selected exopolysaccharides such as xanthan, gellan, exopolysaccharides of lactic acid bacteria, dextran, bacterial cellulose, alginic acid, hyaluronic acid, mannans.
    Źródło:
    Wiadomości Chemiczne; 2016, 70, 7-8; 473-496
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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