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    Wyświetlanie 1-12 z 12
    Tytuł:
    Comparison of Magnetic and Mössbauer Results Obtained for Palaeozoic Rocks of Hornsund, Southern Spitsbergen, Arctic
    Autorzy:
    Szlachta, K.
    Michalski, K.
    Brzózka, K.
    Górka, B.
    Gałązka-Friedman, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811894.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    91.25.F-
    Opis:
    This analysis was performed as a part of the palaeomagnetic project focused on the reconstruction of the palaeogeographic position of the Svalbard Archipelago and adjacent crustal units (European Arctic) in the Palaeozoic and Mesozoic. Three rock formations - Cambrian, Devonian and Carboniferous were sampled in the area of Hornsund, southern Spitsbergen. The main aim of the presented study is to identify ferromagnetic minerals (sensu lato) - the carriers of the natural remanent magnetisation in the investigated rocks. A wide range of magnetic methods were used: the Lowrie tests, unblocking temperatures determinations and the measurement of coercivity spectra as well as the Mössbauer studies. In Devonian and Carboniferous samples all applied methods indicate the domination of the hematite natural remanent magnetisation carrier. In Cambrian rocks magnetic measurements reveal a mixture of ferromagnetic (sensu lato) minerals with varying coercivities and unblocking temperatures. The Mössbauer data improve the identification, suggesting that in Cambrian rocks the carrier of the dominating natural remanent magnetisation component is maghemite.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1675-1682
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Different Signals of Magnetic Resonance Imaging and Ultrasound from Substantia Nigra in Parkinsons Disease and Control - Is Iron the Cause?
    Autorzy:
    Szlachta, K.
    Sadowski, K.
    Kuliński, R.
    Gałązka-Friedman, J.
    Friedman, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490100.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.19.L-
    Opis:
    Motor symptoms of Parkinson's disease are caused by a progressive degeneration of substantia nigra, a small structure located deep in the brain. The cause of this process is unknown but may be related to iron mediated oxidative stress. The aim of this study was to understand the mechanism of the change of magnetic resonance and ultrasound signals found in patients with Parkinson's disease, which were attributed by several authors to an important increase of the concentration of iron in substantia nigra. USG and MRI measurements were performed on phantoms simulating human brain to which high amounts of iron were introduced. The USG signal was unaffected by insertion of iron-loaded ferritin, while it was by insertion of glial tissue. Injections of iron-loaded ferritin and iron ions to the phantoms decreased $T_2$ relaxation time. Our results suggest that the observed change of the signal from Parkinsonian brains is probably due to a proliferation of glia and not to an increase of the concentration of iron.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2; 454-456
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possible Causes of Asymmetry in the Mössbauer Spectra of~Brain Tissue
    Autorzy:
    Szlachta, K.
    Gałązka-Friedman, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506658.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.kx
    Opis:
    Iron present in the human brain plays important role in neurodegenerative diseases like Parkinson and Alzheimer diseases. Brain iron is mainly stored within globular protein called ferritin. Mössbauer spectra of brain tissue are asymmetric doublets at 300 K and 90 K. This asymmetry is slightly bigger in the case of samples taken from diseased subjects. Reason for this is still unknown. Few possible causes of aforesaid difference had been discussed. Nanometer-size of ferritin iron cores, pathological protein influence were taken into account. It was also discussed if experimentally available statistics is sufficient to obtain reliable asymmetry coefficient from Mössbauer spectra. Physical experiment were reproduced by means of computer simulations. Nevertheless, the reason for the asymmetry has not been completely elucidated yet.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 84-87
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An example of the application of Mössbauer spectroscopy for determination of concentration of iron in lyophilized brain tissue
    Autorzy:
    Rzepecka, P.
    Duda, P.
    Giebułtowicz, J.
    Sochacka, M.
    Friedman, A.
    Gałązka-Friedman, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147214.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer spectroscopy
    background spectrum
    iron concentration
    brain tissue
    calibration curve
    Opis:
    Mössbauer spectroscopy is not routinely used for the determination of the concentration of iron. However, as this method does not need any pre-treatment of samples before measurements, it may be of extreme importance for the assessment of iron in samples, which can then be used for further investigations. Biological samples are a good example, however, as the concentrations of iron are very low in these, it is important to exclude possible artefacts from the background spectrum related to iron present in the counter and cryostat windows. The aim of this study was to compare two methods of determination of the amounts of iron in investigated sample: one, in which the background spectrum was subtracted from the sample spectrum measured, and the other, in which the obtained non-elaborated spectrum was fitted with two doublets – a doublet for the measured sample and a doublet for the background spectrum. Three samples containing known amounts of natural iron (400, 800 and 1600 µg) and a sample of lyophilized human brain tissue obtained from globus pallidus were assessed. Both methods led to the creation of a very good calibration curve with a correlation coefficient of 0.99. Although both methods gave similar results for the concentration of iron in the sample, the subtraction of the background spectrum had a significantly lower error of the final result.
    Źródło:
    Nukleonika; 2017, 62, 2; 159-163
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Catalogue of Martian Mössbauer Spectra
    Autorzy:
    Maliszewski, A.
    Gałązka-Friedman, J.
    Szlachta, K.
    Urbanski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506298.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    91.25.F-
    Opis:
    The suggestion of sending a Mössbauer spectrometer to the surface of Mars was elaborated in 1988 year. In 1989 realization of this project was taken by scientists from Western Europe and USSR. Finally a Mössbauer spectrometer adapted to measurements on the surface of Mars was constructed by an international team under the guidance of G. Klingelhöfer. Mössbauer data from Mars are available for open public access on a web site of Planetary Data System. Based on these data the catalogue of Martian Mössbauer spectra was prepared and located on the web site of one of the author (JGF). The aim of the construction of this catalogue was to create the possibility to compare quickly spectra from different places on the Martian surface.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 10-11
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    T1 and T2 Relaxation Times from Substantia Nigra in Parkinsons Disease and Control
    Autorzy:
    Kuliński, R.
    Szlachta, K.
    Gałązka-Friedman, J.
    Friedman, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1360221.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.19.L-
    Opis:
    The diagnosis of Parkinson's disease, and also other neurodegenerative disorders, is based on clinical examination. Many attempts are undertaken to find a test that could confirm this clinical diagnosis. Many hopes were attributed to magnetic resonance imaging but its importance remains obscure. The aim of this study was to compare T1 and T2 relaxation times from substantia nigra of patients with clinical diagnosis of Parkinson's disease and age-matched controls. A decrease of T2 (54.5 ± 1.4 ms vs. 58.0 ± 1.5 ms) in Parkinson's disease vs. control was found with confidence level of 5%. T1 did not differ significantly between Parkinson's disease and control (624 ± 17 ms vs. 614 ± 21 ms).
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 869-871
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Mössbauer studies of the Baszkówka ordinary chondriteand some other meteorites
    Autorzy:
    Gałązka-Friedman, J.
    Bauminger, E. R.
    Nowik, I.
    Bakun-Czubarow, N.
    Stępniewski, M.
    Siemiątkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059308.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ordinary chondrites
    parent body
    Mössbauer spectroscopy
    Q angle
    troilite
    kamacite
    olivine
    pyroxene
    weathering
    oxidation
    Opis:
    It was suggested that perhaps Mössbauer parameters of troilite could serve as a criterion for an interpretation of the origin of various meteorites. It was found that in three meteorites coming from the same parent body (Baszkówka, Mt. Tazerzait and Songyuan) the angle between the principal axis of the electric field gradient (EFG) and the direction of the magnetic field in troilite is around 60o. Further investigations showed that in some other meteorites, not belonging to this group, this angle is close to 90o.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 319-326
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Iron in Alzheimers and Control Hippocampi - Mössbauer, Atomic Absorption and ELISA Studies
    Autorzy:
    Gałązka-Friedman, J.
    Bauminger, E.
    Szlachta, K.
    Koziorowski, D.
    Tomasiuk, R.
    Jaklewicz, A.
    Wszołek, Z.
    Dickson, D.
    Kaplińska, K.
    Friedman, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506657.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.kx
    Opis:
    Alzheimer disease is a neurodegenerative process of unknown mechanism taking place in a part of the brain - hippocampus. Oxidative stress and the role of iron in it is one of the suggested mechanisms of cells death. In this study several methods were used to assess iron and iron binding compounds in human hippocampus tissues. Mössbauer spectroscopy was used for identification of the iron binding compound and determination of total iron concentration in 12 control and one Alzheimer disease sample of hippocampus. Mössbauer parameters obtained for all samples suggest that most of the iron is ferritin-like iron. The average concentration of iron determined by Mössbauer spectroscopy in control hippocampus was 45±10 ng/mg wet tissue. The average concentration of iron in 10 Alzheimer disease samples determined by atomic absorption was 66±13 ng/mg wet tissue. The concentration of H and L chains of ferritin in 20 control and 10 AD hippocampi was assessed with enzyme-linked immuno-absorbent assay. The concentration of H and L ferritin was higher in Alzheimer disease compared to control (19.36±1.51 vs. 5.84±0.55 ng/μg protein for H, and 1.39±0.25 vs. 0.55±0.10 for L). This 3-fold increase of the concentration of ferritin is accompanied by a small increase of the total iron concentration.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 81-83
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer Studies of Pathological Brain Tissues Affected by PSP Disease
    Autorzy:
    Gałązka-Friedman, J.
    Bauminger, E.
    Szlachta, K.
    Schweitzer, K.
    Wszolek, Z.
    Dickson, D.
    Friedman, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1809541.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.kx
    Opis:
    Progressive supranuclear palsy (PSP) is a neurological disease leading to the damage of two brain structures: globus pallidus and substantia nigra. The pathomechanism of this disease is still unknown. One of the hypotheses is oxidative stress. Oxidative stress is an overproduction of free radicals in which iron may be involved. To verify the hypothesis that iron may play a role in PSP we performed the Mössbauer comparative studies of pathological and control tissues. Ten samples of PSP globus pallidus, ten samples of PSP substantia nigra, twelve control samples of globus pallidus and nine control samples of substantia nigra were measured in a conventional Mössbauer spectrometer at 90 K. The Mössbauer spectra obtained for all samples showed well resolved doublets with an isomer shift of 0.46±0.01 mm/s and a quadruple splitting of 0.70±0.02 mm/s. The main difference in these preliminary studies was in the concentration of iron. The concentration in PSP samples in globus pallidus was found to be 257±19 ng/mg tissue, compared to 183±22 ng/mg in control samples and 301±26 ng/mg in substantia nigra compared to 188±22 ng/mg in control samples. Taking into consideration that we did not notice any substantial increase in iron concentration in Parkinsonian substantia nigra compared to control substantia nigra, but a substantial increase in both substantia nigra and globus pallidus in PSP, may suggest that iron plays a different role in the pathomechanisms of PSP and of Parkinson's disease.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 545-547
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mossbauer studies of Sołtmany meteorite - preliminary results
    Autorzy:
    Gałązka-Friedman, J.
    Szlachta, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/411513.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Mössbauer spectroscopy
    Sołtmany meteorite
    Baszkowka meteorite
    ordinary chondrites classification
    Opis:
    In Mossbauer spectra of the Sołtmany meteorite we identified four iron-bearing minerals: olivine, pyroxene, kamacite and troilite. The distribution of iron among these minerals is different in the Sołtmany meteorite from this distribution in the Baszkowka meteorite. As Sołtmany and Baszkowka meteorites are ordinary chondrites type L (both falls), differences in the distribution of iron over the four main iron-bearing mineral phases could be the basis for a new classification of L-type ordinary chondrites. Small amounts of taenite were also observed in the Sołtmany meteorite. The ratio of iron in kamacite and taenite in the Sołtmany meteorite was found to be about 3. No Fe3+ could be detected.
    Źródło:
    Meteorites; 2012, 2, No. 1-2; 73-77
    2299-0313
    2299-1220
    Pojawia się w:
    Meteorites
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of iron in pathogenesis of Parkinson disease
    Autorzy:
    Galazka-Friedman, J.
    Friedman, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/80638.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cell membrane
    electron microscopy
    ELISA test
    ferritin
    free radical
    human brain
    iron
    lipid peroxidation
    liver
    neurodegeneration
    oxidative stress
    Parkinson's disease
    pathogenesis
    substantia nigra
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2011, 92, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer Studies of Volhynian Basalts
    Autorzy:
    Bakun-Czubarow, N.
    Milczarski, J.
    Gałązka-Friedman, J.
    Szlachta, K.
    Forder, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506297.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    91.25.F-
    Opis:
    The Volhynian basalts studied belong to the effusive-tuffogenic Volhynian Series (Sławatycze Series in Poland), being the large Ediacaran continental igneous province, that covers an area of 200 000 $km^{2}$ in the western margin of East European Craton. The series is underlain by the Cryogenian terrigenous Polesie Series with doleritic sills and dikes. The Volhynian Series consists of the rock beds belonging to the three volcanic cycles with different ratios of flood basalts to pyroclastics. The aim of the study was recognition of primary and secondary Fe-bearing minerals, particularly Fe- and Fe-Ti oxides as well as determination of iron oxidation state, that is an important tool in the search for native copper deposits in these rocks. For Mössbauer studies the following rock samples were chosen: the Polesie Series dolerites, the Volhynian Series basalts from the Ukrainian quarries and drill-holes, e.g. from the Volodymir Volhynskaya drilling hole; the Sławatycze Series basalts from Kaplonosy drill-hole in Poland. In the Kaplonosy basalts the content of magnetite decreases with depth, which may be caused by magma differentiation due to fractional crystallization, when Mg content decreases as Ti and Fe - increases in basic magma. In the Kaplonosy basalts the $Fe^{2+}//Fe^{3+}$ ratio increases with depth, which points to the increase of iron oxidation with the progress of basaltic magma differentiation.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 7-9
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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