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    Wyświetlanie 1-4 z 4
    Tytuł:
    Wpływ stężenia hydrokoloidu na moc mieszania oraz parametry reologiczne wodnych roztworów gumy guar
    Influence of hydrocolloid concentration on the mixing power and rheological parameters of guar gum aqueous solutions
    Autorzy:
    Nowak, M.
    Kijowska, K.
    Kabziński, M.
    Ptaszek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073359.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    mieszanie
    guma guar
    reometria mieszadłowa
    mixing
    guar gum
    mixer-type rheometry
    Opis:
    Przeanalizowano wpływ stężenia hydrokoloidu na właściwości reologiczne wybranego modelowego układu spożywczego poddawanego mieszaniu długotrwałemu. Użyto wodnych roztworów gumy guar. Mieszanie przeprowadzono w warunkach skokowo wzrastającej liczby obrotów mieszadła wstęgowego. Moc mieszania oraz parametry reologiczne obliczono na podstawie uzyskanych w pomiarach wartości momentu obrotowego przyłożonego na wale mieszadła oraz prędkości obrotowej mieszadła. Wyniki w postaci krzywych płynięcia posłużyły do wyznaczenia wartości parametrów równania Ostwalda-de Waele. Dane eksperymentalne opisano ponadto równaniami empirycznymi podającymi zależności średnich mocy chwilowych oraz średnich lepkości pozornych od stężenia gumy guar w poszczególnych układach.
    An influence of hydrocolloid concentration on rheological properties of model food fluids under long-term mixing is analyzed in the paper. Aqueous solutions of guar gum were used as model food fluids. The helical ribbon stirrer rotational speed was increased step by step. The mixing power and rheological parameters were calculated on a base of measured values of torque and rotational speed of the stirrer. The flow curves were used for the calculation of Ostwald-de Waele equation parameters. Moreover, the experimental data were described by power monomials and their coefficients were determined.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2018, 2; 31--33
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exogenous seed treatment with proline and its consequences to Norway spruce (Picea abies (L.) H. Karst) seedling establishment
    Autorzy:
    Kijowska-Oberc, J.
    Wawrzyniak, M.K.
    Staszak, A.M.
    Ratajczak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2130182.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    proline
    seed treatment
    Norway spruce
    seedlings development
    tree seeds
    oxidative stress
    Opis:
    Accumulation of proline is a defense mechanism against external stress conditions, preventing damage to the structure and function of cells and improving plant development processes, such as germination. The purpose of this study was to investigate proline treatment as a means of improving the germination and development of Norway spruce seedlings. The effect of exogenous proline has been studied in three stages of initial plant development. The collected seeds were soaked in water or 8 mM proline solution and placed on the germinators. The germination capacity and the mean germination time were determined. Seedlings with radicles >10 mm were transferred to the sand-peat substrate at a constant temperature of 20 °C. Seedlings at 3 subsequent developmental stages (S1 – germinated seeds with radicles > 3 mm; S2 – seedlings with radicles >10 mm; S3 – established seedlings grown for 90 days) were examined for the oxygen consumption rate, total antioxidant capacity, hydrogen peroxide level, malondialdehyde level and intracellular proline content. Proline treatment was conducive to lowering the levels of hydrogen peroxide and malondialdehyde at stage S1. At the subsequent stages of development, the levels of hydrogen peroxide and malondialdehyde increased, and at the S3 stage, there was also a marked increase in total antioxidant capacity. At stage S3, the seedlings of the proline treatment were characterized by a lower total mass, and the response to exogenous proline was stronger in the root tissues than in the leaves. The oxygen consumption rate was higher for the proline treatment at all stages of development. Seedlings at the analyzed stages of establishment differed in response to proline treatment. Exogenous proline had some beneficial effects during the first phase of germination by reducing the level of hydrogen peroxide and improving the condition of lipid membranes. In the subsequent stages of seedling development, in response to the same concentration of proline solution, undesirable effects, such as an increase in hydrogen peroxide levels and damage to cytoplasmic membranes, were observed. Optimal concentrations of exogenous proline should be determined prior to commercial use of proline treatment to improve plant stress tolerance.
    Źródło:
    Dendrobiology; 2022, 87; 149-162
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of spermidine on germination of Salix spp. after storage under controlled conditions
    Autorzy:
    Wawrzyniak, M.K.
    Ley-Lopez, J.M.
    Kijowska-Oberc, J.
    Chmielarz, P.
    Ratajczak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2130180.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    hydrogen peroxide
    cryopreservation
    spermidine
    Salix
    antioxidant
    seed storage
    Opis:
    Willows produce fast germinating and short-lived seeds, difficult to store in the long-term under controlled conditions. The aim of this study was to examine the feasibility of storage of three Salix spp. at controlled temperatures (3°, −10°, −196 °C). We also analyzed the effect of spermidine (Spd) as an antioxidant factor in desiccated seeds. Collected seeds were either desiccated or hydrated to obtain 10 levels of moisture content (between app. 4% and 2%) and subjected to storage at temperatures 3°, −10°, or −196 °C (liquid nitrogen; LN). After two months, seeds were germinated on the light at 20 °C. Seeds desiccated below a safe range of moisture content were further tested and germinated on filter paper with additions of 0.25 mM Spd solution. After 7 days seedlings were examined for hydrogen peroxide content (H2O2) and total antioxidant capacity (TAC). Fresh seeds of three Salix species: Persian willow (S. aegyptiaca L.), heartleaf willow (S. cordata Michx.) and crack willow (S. ×fragilis L.) were successfully stored at temperature −10° and −196 °C for two months. After cryopreservation seed of S. aegyptiaca, S. cordata, and S. ×fragilis germinated without viability loss in moisture content ranging from 4.4–15.9%, 6.4–18.5%, and 7.1–11.5% respectively. The addition of Spd during germination of desiccated seed did not affect germination capacity. However, seedlings of S. aegyptiaca had lower hydrogen peroxide content in comparison with control (germination on water). Seedlings of S. cordata showed an increase in hydrogen peroxide content in control after storing in LN. In seedlings of Crack willow Spd increased hydrogen peroxide content. Seeds of tested species differ in response to storage conditions. Salix seeds can be stored successfully for two months at −10° or −196 °C without losing viability in the safe range of moisture content. Storing at 3 °C can be used for storage in the narrower range of seeds’ moisture content, however, seedlings stored at this temperature produce a higher level of reactive oxygen species. Germinating seeds in Spd did not increase their germination, however in S. aegyptiaca and S. cordata decreased hydrogen peroxide content.
    Źródło:
    Dendrobiology; 2022, 87; 137-148
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural conditions as a premise for the development of the Poznan urbanised area
    Autorzy:
    Mizgajski, A.
    Brodka, S.
    Fagiewicz, K.
    Kijowska, J.
    Lowicki, D.
    Markuszewska, I.
    Ponizy, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/86250.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Asocjacja Ekologii Krajobrazu
    Źródło:
    Problemy Ekologii Krajobrazu; 2010, 28
    1899-3850
    Pojawia się w:
    Problemy Ekologii Krajobrazu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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