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Wyszukujesz frazę "Szymańska, Renata" wg kryterium: Autor

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Identification of hydroxy-plastochromanol in Arabidopsis leaves
    Autorzy:
    Szymańska, Renata
    Kruk, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1040435.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Arabidopsis
    hydroxy-plastochromanol
    plastochromanol
    plastoquinol
    tocopherol
    light stress
    Opis:
    In the present study we have identified hydroxy-plastochromanol in plants for the first time. This compound was found both in low light and high light-grown Arabidopsis plants, however, under high light stress its level was considerably increased. Hydroxy-plastochromanol accumulated also during ageing of leaves of low light-grown plants, similarly as in the case of other prenyllipids. Our results indicate that hydroxy-plastochromanol found in leaves is probably formed as a result of plastochromanol oxidation by singlet oxygen generated in photosystem II during photosynthesis. These data also support the hypothesis that plastochromanol is an efficient antioxidant in vivo, similarly as tocopherols and plastoquinol.
    Źródło:
    Acta Biochimica Polonica; 2010, 57, 1; 105-108
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Occurrence of neoxanthin and lutein epoxide cycle in parasitic Cuscuta species
    Autorzy:
    Kruk, Jerzy
    Szymańska, Renata
    Powiązania:
    https://bibliotekanauki.pl/articles/1040836.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    violaxanthin de-epoxidase
    Cuscuta
    xanthophyll cycle
    zeaxanthin epoxidase
    neoxanthin
    lutein epoxide cycle
    Opis:
    In the present study, xanthophyll composition of eight parasitic Cuscuta species under different light conditions was investigated. Neoxanthin was not detected in four of the eight species examined, while in others it occurred at the level of several percent of total xanthophylls. In C. gronovii and C. lupuliformis it was additionally found that the neoxanthin content was considerably stimulated by strong light. In dark-adapted plants, lutein epoxide level amounted to 10-22% of total xanthophylls in only three species, the highest being for C. lupuliformis, while in others it was below 3%, indicating that the lutein epoxide cycle is limited to only certain Cuscuta species. The obtained data also indicate that the presence of the lutein epoxide cycle and of neoxanthin is independent and variable among the Cuscuta species. The xanthophyll cycle carotenoids violaxanthin, antheraxanthin and zeaxanthin were identified in all the examined species and occurred at the level found in other higher plants. The xanthophyll and lutein epoxide cycle pigments showed typical response to high light stress. The obtained results also suggest that the ability of higher plants to synthesize lutein epoxide probably does not depend on the substrate specificity of zeaxanthin epoxidase but on the availability of lutein for the enzyme.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 1; 183-190
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pollen morphology of some species of the genus Sansevieria petagna (Asparagaceae)
    Autorzy:
    Klimko, Małgorzata
    Nowińska, Renata
    Wilkin, Paul
    Wiland-Szymańska, Justyna
    Powiązania:
    https://bibliotekanauki.pl/articles/952105.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pollen variability
    micromorphology
    taxonomy
    sem
    Opis:
    Pollen grains of 15 species of the genus Sansevieria were examined using light and scanning electron microscopy. The pollen grains were single, but dyads were also found. The basic shape of the pollen grains (with chemical treatment) was subprolate, prolate and prolate-spheroidal and the pollen grains were large (> 50 mm). The pollen grains observed in SEM were prolate-spheroidal, subprolate, prolate and perprolate. The aperture occupied nearly the entire distal hemisphere. The surface of non-apertural areas was microreticulate, psilate–perforate, fossulate and verrucate. The surface of the apertural area was psilate-perforate-verrucate, microreticulate-verrucategemmate and psilate-perforate. The tectum was homogeneous, with perforations. Our results suggest that some species cannot be separated based on pollen grain morphology, but only may be categorized into their groups. The present study investigated pollen grain morphology in eleven species for the first time in terms of pollen micromorphology and provided some important new data.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2017, 59, 2
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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