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Wyszukujesz frazę "Szymańska, Renata" wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Fitosterole - występowanie i znaczenie dla człowieka
    Phytosterols - occurrence and importance for man
    Autorzy:
    Szymańska, Renata
    Kruk, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1197776.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Przyrodników im. Kopernika
    Opis:
    Phytosterols (plant sterols) are compounds widely distributed among the plant kingdom occurring in the highest amounts in plant oils. They can be classified into two groups: sterols and stanols, which have fully saturated sterol rings. The main interest in phytosterols is due to their cholesterol-lowering effect in human plasma which is important for their application in different food products as natural drugs protecting against arteriosclerosis and heart diseases. Moreover, it has been shown that phytosterols show also anticancer action against colon, breast and prostate cancer and have antioxidation properties.
    Źródło:
    Kosmos; 2007, 56, 1-2; 107-114
    0023-4249
    Pojawia się w:
    Kosmos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Witamina E - metabolizm i funkcje
    Vitamin E - metabolism and functions
    Autorzy:
    Szymańska, Renata
    Nowicka, Beatrycze
    Kruk, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1196815.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Przyrodników im. Kopernika
    Opis:
    Vitamin E belongs to the group of chemical compounds called tocochromanol. It is synthesized exclusively by plants but fulfills also numerous important functions in humans. In the present article the occurrence and biosynthesis of vitamin E in plants have been described, as well as its diverse functions in plants including antioxidant action. Moreover, the metabolism of vitamin E and physiological significance in humans have been presented.
    Źródło:
    Kosmos; 2009, 58, 1-2; 199-210
    0023-4249
    Pojawia się w:
    Kosmos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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