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    Wyświetlanie 1-7 z 7
    Tytuł:
    Atomic Force Microscopy Imaging of Membrane Proteins
    Autorzy:
    Gonçalves, R.P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1539109.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.14.ep
    87.64.Dz
    Opis:
    Atomic force microscopy is a technique particularly adapted to the study of flat objects. The possibility to use it in an aqueous environment makes it a unique tool in biology, providing high resolution structural information of biological membranes. Here we will review atomic force microscopy advances in the study of membrane protein imaging, covering reconstituted proteins in lipid bilayers, native membranes and reviewing function-related imaging and its outcomes.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 408-411
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Adhesion Interaction Using Atomic Force Microscopy
    Autorzy:
    Gryboś, J.
    Pyka-Fościak, G.
    Lebed, K.
    Lekka, M.
    Stachura, Z.
    Styczeń, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038080.pdf
    Data publikacji:
    2004-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.Dz
    68.35.Gy
    Opis:
    An atomic force microscope is a useful tool to study the interaction forces at molecular level. In particular the atomic force microscope can measure an unbinding force needed to separate the two single molecule complexes. Recent studies have shown that such unbinding force depends linearly on the logarithm of the applied loading rate, defined as a product of scanning velocity and the spring constant characterizing the investigated system (cantilever vs. surface). This dependence can be used to study the energy landscape shape of a molecular complex by the estimation of energy barrier locations and the related dissociation rates. In the present work the complex consisting of ethylene(di)aminetetraacetic acid and the bovine serum albumin was measured. The dependence between the unbinding force and the logarithm of the loading rate was linear. Using the Bell model describing the dissociation of the above molecules caused by the action of the external bond breaking force, two parameters were estimated: the dissociation rate and the position of the energy barrier needed to overcome during a transition from a bound to unbound state. The obtained results are similar to those obtained for a typical ligand-receptor interaction.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 5; 501-510
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    AFM Investigation of Biological Nanostructures
    Autorzy:
    Strzelecki, J.
    Dąbrowski, M.
    Strzelecka, J.
    Tszydel, M.
    Mikulska, K.
    Nowak, W.
    Balter, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419535.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.Dz
    81.07.-b
    Opis:
    Nanostructures created by living organisms, optimized through millions of years of evolution, can be a valuable inspiration for nanotechnology. We employ atomic force microscopy to examine such structures in materials created by common organisms - caddisfly and diatoms. Caddisfly larvae are well known for their ability to spin silk, which serves as an "adhesive tape" to glue various materials and collect food in aqueous environment. Atomic force microscopy imaging of caddisfly silk, performed for the first time by our team, has shown that its surface is patterned with 150 nm extensions - a feature related to its exceptional underwater sticking abilities. Results of force spectroscopy of protein structures found on the surface are also shown. A characteristic feature of diatoms is that they are encased within a unique silica cell wall called frustules, patterned with 200 nm pores, which allow cellular interaction with the environment. We perform atomic force microscopy imaging of frustules in living diatoms as well as adhesion measurements inside pores.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 329-332
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular Interaction between Bacterial Antigens and Macrophage Receptors Studied by Atomic Force Microscopy
    Autorzy:
    Targosz, M.
    Czuba, P.
    Biedroń, R.
    Strus, M.
    Gamian, A.
    Marcinkiewicz, J.
    Szymoński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044777.pdf
    Data publikacji:
    2006-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.37.Rs
    87.64.Dz
    87.15.Kg
    Opis:
    Atomic force spectroscopy was used to study interaction strengths between bacterial antigens and receptors on macrophages. This method allowed for a direct comparison of the interaction strengths in different systems studied at the level of single molecules.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 3; 421-426
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parallel Mappings as a Key for Understanding the Bioinorganic Materials
    Autorzy:
    Kuczumow, A.
    Nowak, J.
    Chałas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808388.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.En
    87.64.Bx
    87.64.Dz
    87.59.-e
    82.80.-d
    Opis:
    Important bioinorganic objects, both living and fossilized are as a rule characterized by a complex microscopic structure. For biological samples, the cell-like and laminar as well as growth ring structures are among most significant. Moreover, these objects belong to a now widely studied category of biominerals with composite, inorganic-organic structure. Such materials are composed of a limited number of inorganic compounds and several natural organic polymers. This apparently simple composition leads to an abnormal variety of constructions significant from the medical (repairs and implants), natural (ecological effectiveness) and material science (biomimetic synthesis) point of view. The analysis of an image obtained in an optical microscope, optionally in a scanning electron microscope is a topographical reference for further investigations. For the characterization of the distribution of chemical elements and compounds in a material, techniques such as X-ray, electron- or proton microprobes are applied. Essentially, elemental mappings are collected in this stage. The need for the application of an X-ray diffraction microprobe is obvious and our experience indicates on the necessity of using the synchrotron-based devices due to their better spatial resolution and good X-ray intensity. To examine the presence of the organic compounds, the Raman microprobe measurements are good options. They deliver information about the spatial distribution of functional groups and oscillating fragments of molecules. For the comprehensive investigation of bioinorganic material structural and chemical features, we propose the following sequence of methods: optical imaging, elemental mapping, crystallographic mapping, organic mapping and micromechanical mapping. The examples of such an approach are given for: petrified wood, human teeth, and an ammonite shell.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 482-488
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atomic Force Microscopy and Quartz Crystal Microbalance Study of the Lectin-Carbohydrate Interaction Kinetics
    Autorzy:
    Lebed, K.
    Kulik, A. J.
    Forró, L.
    Lekka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047270.pdf
    Data publikacji:
    2007-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.Dz
    84.37.+q
    87.15.Kg
    82.37.Np
    81.65.Cf
    52.77.Bn
    Opis:
    Two analytical methods, atomic force microscopy and quartz crystal microbalance, were applied to the study of the reaction kinetics occurring between concanavalin A and carboxypeptidase Y, presenting the specific lectin-carbohydrate recognition. The dissociation rate constants for concanavalin A-carboxypeptidase Y complex obtained using both atomic force microscopy and quartz crystal microbalance were of the same order of magnitude: k$\text{}_{diss}$=0.170± 0.060 s$\text{}^{-1}$ and k$\text{}_{diss}$=0.095±0.002 s$\text{}^{-1}$, respectively. In addition, each method alone aided in determining other parameters characterizing the studied interaction. Quartz crystal microbalance permitted us to estimate the association rate (k$\text{}_{ass}$=(5.6 ±0.1)×10$\text{}^{4}$ M$\text{}^{-1}$ s$\text{}^{-1}$) and the equilibrium (K$\text{}_{a}$=(0.59×0.01)×10$\text{}^{6}$ M$\text{}^{-1}$) constants for the binding process occurring between concanavalin A and mannose residues of carboxypeptidase Y under given experimental conditions. Atomic force microscopy in force spectroscopy mode enabled the determination of the energy barrier position of r=2.29±0.04 Å characterizing the dissociation of concanavalin A- carboxypeptidase Y molecular complex. The presented results show that both atomic force microscopy and quartz crystal microbalance can be used to determine quantitative parameters characterizing the specific molecular interaction. Both methods can be easily combined for complementary and/or alternative studies of a chosen molecular interaction. By preparing the samples in the same manner the direct comparison between the data obtained via atomic force microscopy and quartz crystal microbalance can be made.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 2; 273-286
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Epidermal Layers Characterisation by Opto-Magnetic Spectroscopy Based on Digital Image of Skin
    Autorzy:
    Koruga, Đ.
    Bandić, J.
    Janjić, G.
    Lalović, Č.
    Munćan, J.
    Dobrosavljević Vukojević, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1489823.pdf
    Data publikacji:
    2012-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.58.Bh
    07.05.Pj
    42.79.-e
    42.30.-d
    42.25.Ja
    87.64.Dz
    Opis:
    According to the most literature data, the skin is usually observed as a simple structure with equivalent electrical model, which includes general properties of epidermis, basal membrane and dermis. In this paper, we analyzed the skin structure as a more complex system. Particularly we analyzed epidermis based on layers approach and its water organization in lipids ordered in sub-layers. Using opto-magnetic spectroscopy method, which is very sensitive to paramagnetic/diamagnetic properties of the tissue, we found out that nanowater structure ordering in lipids of epidermal layers play very important role in skin properties. We use bioimpedance as complementary and compatible method to opto-magnetic spectroscopy in skin characterization. In our investigation we found out the difference of the skin properties of the people who are drinking two different type of water (Z and N). We observed the significant difference in middle part of stratum granulosum, where water-lipid sub-layers exists. These results indicate importance of water nanolayers presence in epidermis and type of drinking water reflecting on human skin properties.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 3; 606-610
    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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