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    Wyświetlanie 1-7 z 7
    Tytuł:
    Analysis of Human Lenses by Raman Microspectroscopy
    Autorzy:
    Paluszkiewicz, C.
    Chaniecki, P.
    Rękas, M.
    Rajchel, B.
    Piergies, N.
    Kwiatek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398828.pdf
    Data publikacji:
    2016-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.kp
    42.55.Ye
    87.64.-t
    Opis:
    A cataract is an opacity (clouding) of the normally clear lens which develops as a result of aging, metabolic disorders, trauma or heredity. The number of patients with cataract is increasing exponentially. This disease requires surgical intervention, to remove the cloudy lens and to introduce the eye lens polymer. In this work we will present analyses of degraded parts of human lens. Experimental materials were obtained from the lens removed during surgical intervention. These biological samples were measured using Almega XR Confocal Raman spectrometer (Thermo Scientific) with an excitation source of 785 nm laser line. The Raman vibrations in the spectral region of 650-1750 cm¯¹ were analyzed. The difference spectra revealed an excess of tryptophan, tyrosine, phenylalanine, β-sheet conformation, and molecules or molecular groups.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 2; 244-246
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Study of Selected Biomaterials Using Vibrational Spectroscopy
    Autorzy:
    Paluszkiewicz, C.
    Kwiatek, W.
    Długoń, E.
    Wesełucha-Birczyńska, A.
    Piccinini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1809387.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.km
    87.64.kp
    87.64.Ee
    87.85.jf
    Opis:
    Vibrational spectroscopy has been extensively used for in vitro and in vivo investigations of degradation mechanism and kinetics of different biomedical materials as well as it has been used to characterize the crystalline and amorphous domains in bio-mineralization process. Infrared and Raman spectroscopy methods are valuable tools in the biomaterials engineering allowing to study processes occurring during their preparation. In vitro tests, where the materials are immersed in simulated body fluids and/or artificial saliva, were used to evaluate the biocompatibility of biomaterials. This kind of tests are a wide range of repeatable and reproducible methods, which are regulated by international standards for commercial use and scientific development of new materials and products. The aim of this work was to examine phase composition of materials applied in dentistry. The bioactivity of such biomaterials was studied by immersing the samples in synthetic body fluid and artificial saliva. The changes were determined by the Fourier transform infrared and Raman microspectroscopy as well as scanning electron microscopy. It was found that results obtained by vibrational spectroscopy show the differences between the studied samples. Chemical reactions occurring during incubation of cements in artificial saliva as well as in synthetic body fluid result in formation of phosphates which deposit on the cement surface.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 533-536
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of μ-FTIR-SR Spectroscopy to Prostate Tissue Analysis
    Autorzy:
    Kwiatek, W.
    Paluszkiewicz, C.
    Banaś, A.
    Kisiel, A.
    Podgórczyk, M.
    Marcelli, A.
    Cestelli Guidi, M.
    Piccinini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810277.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.km
    87.64.kp
    87.64.Ee
    87.85.jf
    Opis:
    The infrared spectromicroscopy is a quite recent technique rapidly developing thanks to the availability of new instruments and new brilliant synchrotron radiation sources in different areas and in particular to biomedical researches. In order to achieve a diffraction limited spatial resolution in tissue samples, we performed experiments at SINBAD, the synchrotron infrared beamline of the Laboratori Nazionali di Frascati. We characterized the chemical composition of prostate tissue samples taken from patients affected by prostate cancer disease. Different sizes of the pinholes were considered for the measurements. In the case of prostate tissue sections the results show the possibility to determine the intensity ratio of the $CH_2$ and $CH_3$ bands set at 2930 $cm^{-1}$ and 2960 $cm^{-1}$, respectively. Experiments were also performed with a pinhole of 5 μm of diameter and the differences in both histological and chemical compositions of such samples were determined.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 602-605
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    $[FeCl_{4}]¯$ Ionic Liquid Based Ferrofluids
    Autorzy:
    Parnica, J.
    Kesa, P.
    Kovac, J.
    Timko, M.
    Antalik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368745.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.kp
    75.50.Bb
    47.65.Cb
    75.50.Mm
    Opis:
    Magnetic ionic liquids derived from hydrochloride methyl ester alanine amino acids (AA) and $FeCl_{3}$ were synthesized in ethanol and their magnetic properties were investigated. Iron (III) chloride forms ionic liquid in ethanol at saturated concentrations by the transfer of Cl¯ anion from one molecule of $FeCl_{3}$ to the other molecule with the creation of tetrachloro ferrate anion $[FeCl_{4}]$¯ as well as dimer $[Fe_{2}Cl_{7}]$¯. Raman scattering indicates that after addition of hydrochloride methyl ester alanine to ethanol solutions of $FeCl_{3}$ increase the intensities of signal at the frequencies at 318 $cm^{-1}$ and 380 $cm^{-1}$ as markers for the presence of $[FeCl_{4}]$¯ and $[Fe_{2}Cl_{7}]$¯ complexes. The magnetization at room temperature showed in both samples a linear dependence on the applied magnetic field. On the other hand, in the Raman scattering experiments the magnetization is smaller for $FeCl_{3}$ sample in the presence of methyl ester alanine.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 276-277
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Spectroscopy Study of the Interaction Between Quercetin and Human Serum Albumin
    Autorzy:
    Wybranowski, T.
    Kruszewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197523.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.K-
    87.64.kv
    87.15.kp
    Opis:
    Optical methods are very useful for the study on behavior of molecules in albumin-containing solutions. The interaction between quercetin (QUE) and human serum albumin (HSA) under physiological conditions was investigated by the methods of UV-Vis absorption and fluorescence spectroscopy. Fluorescence data show that enhancing of quercetin fluorescence in the presence of HSA is the result of formation of the HSA-QUE complex. On the basis of fluorescence data, the binding affinity constant of quercetin to HSA is determined. In this paper we have attempted to perform a kinetic study of the oxidation of quercetin in presence of human serum albumin by absorption spectroscopy. It has been shown that quercetin easily oxidizes at pH 7.4. The addition of HSA to quercetin solution induces changes in the absorption spectrum. In the human serum albumin solution, the time of quercetin oxidation is longer than in the case of quercetin diluted in phosphate buffered saline. Human albumin also contributes to stabilization of quercetin. These results suggest that HSA prevents degradation of quercetin in blood.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4A; A-57-A-60
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluorescence Spectroscopy in Camptothecins Studies
    Autorzy:
    Kruszewski, S.
    Kruszewska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537476.pdf
    Data publikacji:
    2010-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.kv
    87.15.kp
    Opis:
    The application of fluorescence spectroscopy methods to determining the properties of analogues of camptothecin, promising anticancer agents, are described in this paper. The fluorescence anisotropy measurements provide useful information about the binding of camptothecin and its analogues to cell membranes and human serum albumin (HSA) that is important for potential clinical applications of these agents, and permit the selection from many camptothecin analogues those ones exhibiting desirable biomedical properties. Fluorescence anisotropy measurements prove that 3 new camptothecin analogues: 7-tert-butyldimethylsilyl-10-hydroxy-campthothecin, 7-trimethyl-silylethyl-10-hydroxy-camptothecin and 7-trimethyl-silyl-ethyl-10-amino-camptothecin exhibit high affinity of their lactone forms to membranes and low affinity of their carboxylate forms to HSA. Such properties should ensure high stability of these agents in physiological fluids, including blood.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 1; 99-102
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the Protein-Binding Properties of Camptothecins by Means of Optical Spectroscopy Methods
    Autorzy:
    Ziomkowska, B.
    Cyrankiewicz, M.
    Wybranowski, T.
    Kruszewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197530.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.K-
    87.64.kv
    87.15.kp
    02.50.Sk
    Opis:
    Optical spectroscopy methods are widely used in studies of drugs. The affinity of camptothecins - anticancer agents - to human serum albumin (HSA) was determined in this work. Camptothecins (CPTs) exist in two forms: active lactone and open ring inactive carboxylate. In blood, the hydrolysis process of lactone form occurs which leads to deactivation of CPTs. Research is being done on biophysical properties of synthesized CPT compounds, in particular on binding to albumin. The affinity to plasma proteins is an important determinant of stability of CPTs in blood. The following analogues of CPT were tested in this paper: irinotecan, SN-38, topotecan, and 9-amino camptothecin. Using the method of fluorescence anisotropy measurement, the association constants of the studied compounds to HSA were determined. The authors attempted to determine the deactivation rate of topotecan in HSA solution using Principal Component Analysis and Factor Analysis of absorption spectra recorded during hydrolysis process of lactone form.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4A; A-61-A-65
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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