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    Wyświetlanie 1-6 z 6
    Tytuł:
    Buntsandstein magnetostratigraphy in Poland : new data from the Brześć Kujawski IG-1 borehole
    Autorzy:
    Nawrocki, Jerzy
    Becker, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1836254.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    magnetic polarity
    Lower Triassic
    central Poland
    Opis:
    New magnetostratigraphic data from the Middle Buntsandstein section, drilled in the Brześć Kujawski IG-1 borehole (Central Poland), are presented and discussed. The chronostratigraphic positions of particular formations of the Buntsandstein are discussed as well. The magnetic polarity pattern obtained from the Brześć Kujawski IG-1 borehole matches the pattern obtained earlier in other boreholes from the Polish part of the Central European Basin. Although magnetostratigraphy and palynological evidence undoubtedly indicates that the Induan/Olenekian boundary in the Polish part of the CEB is located in the lower part of the Pomerania Formation, the placement of the Olenekian/Anisian boundary within the sedimentary sequences of the Central European Basin remains problematic. This boundary most probably is located within the upper part of the Upper Buntsandstein, as can be inferred from palynological studies.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2020, 90, 4; 435-446
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The characteristics of pore space in Lower Triassic sandstones of the Warsaw region
    Charakterystyka przestrzeni porowej piaskowców triasu dolnego okolic Warszawy
    Autorzy:
    Kuberska, Marta
    Becker, Anna
    Kozłowska, Aleksandra
    Powiązania:
    https://bibliotekanauki.pl/articles/2061596.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    pore space of sandstones
    Lower Triassic
    Warsaw region
    przestrzeń porowa piaskowców
    trias dolny
    okolice Warszawy
    Opis:
    Reservoir and sealing properties of Lower Triassic sandstones from seven boreholes of the central part of the Koszalin-Zamość Synclinorium were investigated in terms of potential levels for underground storage of carbon dioxide. Extensive petrographic studies, image analysis, and investigations of petrophysical properties of rocks and pore space were carried out. The research shows that diagenetic processes both variously affected the intensity of alteration and variously shaped the pore space. Not only primary but also secondary porosity, resulting from diagenetic alteration and dissolution, is observed in the rocks. Microscopic observations revealed that the pore space in studied samples is dominated by macropores. The results obtained indicate a poor suitability of the Lower Triassic deposits for the purpose of carbon dioxide sequestration.
    W pracy przedstawiono badania piaskowców triasu dolnego centralnej części synklinorium koszalińsko-zamojskiego pochodzących z siedmiu otworów wiertniczych, pod kątem ich właściwości kolektorsko-uszczelniających w aspekcie potencjalnych poziomów do podziemnego składowania dwutlenku węgla. Przeprowadzono szeroko zakrojone badania petrograficzne, analizę obrazu i badania właściwości petrofizycznych skał oraz przestrzeni porowej. W wyniku przeprowadzonych prac stwierdzono, że procesy diagenetyczne miały różny wpływ na intensywność zmian i w różny sposób kształtowały przestrzeń porową. W skałach zaobserwowano występowanie porowatości pierwotnej, a także wtórnej, powstałej na skutek przeobrażania i rozpuszczania diagenetycznego. Na podstawie obserwacji mikroskopowych uznano, że przestrzeń porowa w badanych próbkach jest zdominowana przez makropory. Wyniki badań wskazują na niewielką przydatność utworów triasu dolnego na potrzeby sekwestracji dwutlenku węgla.
    Źródło:
    Biuletyn Państwowego Instytutu Geologicznego; 2019, 474; 73--84
    0867-6143
    Pojawia się w:
    Biuletyn Państwowego Instytutu Geologicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Marine vs. terrestrial environments during Early Triassic deposition on the northeastern margin of the Central European Basin : a multidisciplinary study on the Middle Buntsandstein of the Bartoszyce IG 1 borehole, NE Poland
    Autorzy:
    Becker, Anna
    Fijałkowska-Mader, Anna
    Jasionowski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2060144.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Lower Triassic
    northeastern Poland
    palynofacies
    clay mineralogy
    olite microfacies
    isotope geochemistry
    Opis:
    The Middle Buntsandstein Subgroup of the Lower Triassic of north-eastern Poland has been investigated in the context of possible marine ingressions into the Central European Basin. To better constrain these, palynofacies analysis and mineralogical analysis of mudstones were undertaken on samples taken from the Lidzbark and Malbork formations penetrated by the Bartoszyce IG 1 borehole, serving as stratotype section of both lithostratigraphic units. Microfacies and geochemical analyses, including C and O isotope analysis, were conducted additionally on oolitic limestones of the basal Lidzbark Formation (the lowermost Middle Buntsandstein), and the boron content was measured on all mudstone samples. Seven palynofacies types are distinguished: types 1 to 3 within the Malbork Formation and types 4 to 7 within the Lidzbark Formation. Types 1 and 2 originated on a floodplain, type 3 probably in a deltaic or barrier setting, and types 4 and 5 in a brackish lagoon or a more open basin, possibly of marine origin. Palynofacies type 6 reflects long transport and reworking, whereas palynofacies type 7 is interpreted as formed due to pedogenic processes. Clay minerals and quartz, accompanied by feldspars, calcite and dolomite are the main components of the mudstones investigated. The clay mineral association consists of illite or a mixture of illite and smectite, and chlorite. The Lidzbark Formation and the lowermost part of the Malbork Formation show less variability in mineralogical composition than the upper part of the Malbork Formation. Smectite admixtures were detected only in the upper part of the Malbork Formation (the uppermost Middle Buntsandstein). The boron content, achieved after aqua regia digestion, ranges from 70 to 121 mg/kg (96 mg/kg at average), oscillating generally around 90 mg/kg. A higher boron content, bound in silicate structure, is associated with the upper part of the Malbork Formation. All major mineralogical and geochemical changes coincide more or less with the transition from the supposed marine to the terrestrial environmental realm, interpreted from lithological and sedimentological observations within the lowermost part of the Malbork Formation. However, diagenetic alteration of the clay minerals, and of the boron content, could not be ruled out. The oolitic limestones, mainly grainstones, contain admixtures of quartz grains and rare bioclasts, the ooids nuclei being peloids or unrecognizable. The carbonates are almost exclusively composed of low-Mg calcite. A high content of Mg and the presence of small amounts of dolomite suggest that the ooids were primarily composed of high-Mg calcite and are comparable with similar Early Triassic deposits in Tethyan settings. The δ13C values range from -2 to +1%o VPDB, fitting well with the known ranges of Lower Triassic marine carbonates. An observed δ13C depletion towards the top of the oolite-bearing part of the section may reflect a local shallowing trend that led to overall salinity decrease. A possible connection with the one of the global oceanic geochemical episodes has to be tested further. The results obtained suggest a marine origin of the lower Middle Buntsandstein deposits studied and document a terrestrial origin for the upper Malbork Formation.
    Źródło:
    Geological Quarterly; 2020, 64, 4; 1023---1047
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Can macular xanthophylls replace cholesterol in formation of the liquid-ordered phase in lipid-bilayer membranes?
    Autorzy:
    Subczynski, Witold
    Wisniewska-Becker, Anna
    Widomska, Justyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1039790.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    lutein
    spin-labeling
    zeaxanthin
    liquid-ordered phase
    EPR
    Opis:
    Lateral organization of membranes made from binary mixtures of dimyristoylphosphatidylcholine (DMPC) or dipalmitoylphosphatidylcholine (DPPC) and macular xanthophylls (lutein or zeaxanthin) was investigated using the saturation-recovery (SR) EPR spin-labeling discrimination by oxygen transport (DOT) method in which the bimolecular collision rate of molecular oxygen with the nitroxide spin label is measured. This work was undertaken to examine whether or not lutein and zeaxanthin, macular xanthophylls that parallel cholesterol in its function as a regulator of both membrane fluidity and hydrophobicity, can parallel other structural functions of cholesterol, including formation of the liquid-ordered phase in membranes. The DOT method permits discrimination of different membrane phases when the collision rates (oxygen transport parameter) differ in these phases. Additionally, membrane phases can be characterized by the oxygen transport parameter in situ without the need for separation, which provides information about the dynamics of each phase. In gel-phase membranes, two coexisting phases were discriminated in the presence of macular xanthophylls - namely, the liquid-ordered-like and solid-ordered-like phases. However, in fluid-phase membranes, xanthophylls only induce the solitary liquid-ordered-like phase, while at similar concentrations, cholesterol induces coexisting liquid-ordered and liquid-disordered phases. No significant differences between the effects of lutein and zeaxanthin were found.
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 1; 109-114
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integrated palynostratigraphy and magnetostratigraphy of the Middle and Upper Buntsandstein in NE Poland : an approach to correlating Lower Triassic regional isochronous horizons
    Autorzy:
    Becker, Anna
    Fijałkowska-Mader, Anna
    Nawrocki, Jerzy
    Sobień, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2059689.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Buntsandstein
    Lower Triassic
    northeastern Poland
    palynostratigraphy
    magnetostratigraphy
    Opis:
    Despite years of research, Lower Triassic deposits of the epicontinental Central European Basin still lack a detailed stratigraphy that would allow regional correlation of isochronous horizons. The best chronostratigraphic results have up to now been achieved by microspore-based biostratigraphy and magnetostratigraphy. Integrated palynostratigraphic and magnetostratigraphic investigations, carried out on Buntsandstein cores from northeastern Poland representing the eastern margin of the basin, have made precise correlations with the better-explored basin centre. The Lidzbark and Malbork formations of the Bartoszyce IG 1 borehole were examined by means of palynology and palaeomagnetic studies. Further palaeomagnetic studies were applied to the Lidzbark, Malbork and Elbląg formations of the Nidzica IG 1 borehole and the Elbląg Fm. of the Pasłęk IG 1. Two spore-poll en assemblages were distinguished representing the Densoisporites nejburgii Subzone of the D. nejburgii Zone within the lower part of the Lidzbark Fm. and the lowermost part of the Malbork Fm. Mostly reversed polarity was detected within the lower part of the succession investigated, whereas normal polarity prevailed within its upper part. A normal polarity local zone was correlated with the undivided Tbn6-Tbn7 standard magnetozones of western Poland. The reversely polarized part of the succession corresponds most probably to the Tbr5 standard magnetozone. The base of the Tbn6-Tbn7 magnetozone can serve as a good correlation horizon for regional reconstructions.
    Źródło:
    Geological Quarterly; 2020, 64, 2; 460--479
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural aspects of the antioxidant activity of lutein in a model of photoreceptor membranes
    Autorzy:
    Wisniewska-Becker, Anna
    Nawrocki, Grzegorz
    Duda, Mariusz
    Subczynski, Witold
    Powiązania:
    https://bibliotekanauki.pl/articles/1039793.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    macular xanthophylls
    singlet oxygen
    lutein
    antioxidants
    lipid domains
    AMD
    Opis:
    It was shown that in membranes containing raft domains, the macular xanthophylls lutein and zeaxanthin are not distributed uniformly, but are excluded from saturated raft domains and about ten times more concentrated in unsaturated bulk lipids. The selective accumulation of lutein and zeaxanthin in direct proximity to unsaturated lipids, which are especially susceptible to lipid peroxidation, could be very important as far as their antioxidant activity is concerned. Therefore, the protective role of lutein against lipid peroxidation was investigated in membranes made of raft-forming mixtures and in models of photoreceptor outer segment membranes and compared with their antioxidant activity in homogeneous membranes composed of unsaturated lipids. Lipid peroxidation was induced by photosensitized reactions using rose Bengal and monitored by an MDA-TBA test, an iodometric assay, and oxygen consumption (using EPR spectroscopy and the mHCTPO spin label as an oxygen probe). The results show that lutein protects unsaturated lipids more effectively in membranes made of raft-forming mixtures than in homogeneous membranes. This suggests that the selective accumulation of macular xanthophylls in the most vulnerable regions of photoreceptor membranes may play an important role in enhancing their antioxidant properties and ability to prevent age-related macular diseases (such as age-related macular degeneration (AMD)).
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 1; 119-124
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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