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    Wyświetlanie 1-6 z 6
    Tytuł:
    Organismal view of a plant and a plant cell.
    Autorzy:
    Wojtaszek, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/1044138.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    cell wall
    plant cell
    organismal theory
    plant
    cell theory
    apoplast
    Opis:
    Cell walls are at the basis of a structural, four-dimensional framework of plant form and growth time. Recent rapid progress of cell wall research has led to the situation where the old, long-lasting juxtaposition: "living" protoplast - "dead" cell wall, had to be dropped. Various attempts of re-interpretation cast, however, some doubts over the very nature of plant cell and the status of the walls within such a cell. Following a comparison of exocellular matrices of plants and animals, their position in relation to cells and organisms is analysed. A multitude of perspectives of the biological organisation of living beings is presented with particular attention paid to the cellular and organismal theories. Basic tenets and resulting corollaries of both theories are compared, and evolutionary and developmental implications are considered. Based on these data, "The Plant Body" - an organismal concept of plants and plant cells is described.
    Źródło:
    Acta Biochimica Polonica; 2001, 48, 2; 443-451
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Network Theory of Living Cell Clusters and Rheological Applications at Nano-Level
    Autorzy:
    Plavsic, M.
    Pajic-Lijakovic, I.
    Bugarski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503406.pdf
    Data publikacji:
    2011-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.20.-y
    36.20.-f
    64.75.Yz
    87.18.-h
    Opis:
    The system of living cells closed in a polymer matrix and self-organized into clusters is considered, extending free volume concept developed for complex system interactions quantification in statistical mechanics of jammed state of matter. Possibility of extension of Edwards concept of compactivity and angorisity developed for hard irregular grains with friction to living cell systems, is considered. Existences of scaling laws for cell colony grow, related to their self assembling and response to polymer hydrogel micro-environment constrains, is analyzed as function of rate of cluster density increase. Based on the theory proposed are developed relations, connecting cluster properties that are difficult to measure, to data from standard cell cultivation experiments. The model also provides possibilities of incorporation data on single cell behavior, available from modern nano- rheology measurements, into cluster
    Źródło:
    Acta Physica Polonica A; 2011, 120, 2; 266-271
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theory of Red Blood Cell Oscillations in an Ultrasound Field
    Autorzy:
    Johansen, K.
    Kimmel, E.
    Postema, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/178064.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spatio-temporal cell dynamics
    Rayleigh-Plesset equation
    spherical cell
    red blood cell
    erythrocyte
    sonophore
    Opis:
    Manipulating particles in the blood pool with noninvasive methods has been of great interest in therapeutic delivery. Recently, it was demonstrated experimentally that red blood cells can be forced to translate and accumulate in an ultrasound field. This acoustic response of the red blood cells has been attributed to sonophores, gas pockets that are formed under the influence of a sound field in the inner-membrane leaflets of biological cells. In this paper, we propose a simpler model: that of the compressible membrane. We derive the spatio-temporal cell dynamics for a spherically symmetric single cell, whilst regarding the cell bilayer membrane as two monolayer Newtonian viscous liquids, separated by a thin gas void. When applying the newly-derived equations to a red blood cell, it is observed that the void inside the bilayer expands to multiples of its original thickness, even at clinically safe acoustic pressure amplitudes. For causing permanent cell rupture during expansion, however, the acoustic pressure amplitudes needed would have to surpass the inertial cavitation threshold by a factor 10. Given the incompressibility of the inner monolayer, the radial oscillations of a cell are governed by the same set of equations as those of a forced antibubble. Evidently, these equations must hold for liposomes under sonication, as well.
    Źródło:
    Archives of Acoustics; 2017, 42, 1; 121-126
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    DFT studies on the electronic structures of 4-methoxybenzonitrile dye for Dye-Sensitized Solar Cell
    Autorzy:
    Prakasam, A
    Sakthi, D
    Anbarasan, P.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412205.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Dye sensitizer
    density functional theory
    electronic structure
    absorption spectrum
    Opis:
    The geometries, electronic structures, polarizabilities and hyperpolarizabilities of organic dye sensitizer 4-methoxybenzonitrile was studied based on ab initio HF and Density Functional Theory (DFT) using the hybrid functional B3LYP. Ultraviolet-visible (UV-Vis) spectrum was investigated by Time Dependent DFT (TDDFT). Features of the electronic absorption spectrum in the visible and near-UV regions were assigned based on TDDFT calculations. The absorption bands are assigned to π→π* transitions. Calculated results suggest that the three excited states with the lowest excited energies in 4-methoxybenzonitrile is due to photoinduced electron transfer processes. The interfacial electron transfer between semiconductor TiO2 electrode and dye sensitizer 4-methoxybenzonitrile, is due to an electron injection process from excited dye to the semiconductor’s conduction band. The role of nitro group in 4-methoxybenzonitrile in geometries, electronic structures, and spectral properties were analyzed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 7, 1; 8-22
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Działalność naukowa Georgija Woronyja
    Scientific activity of Georgii Voronyi
    Autorzy:
    Iwachiw, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1203123.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    diagramy Woronoja
    komórka Woronoja
    mozaika Woronoja
    płytki Woronoja
    geometria liczb
    teoria liczb
    Voronyi diagrams
    Voronyi cell
    Voronyi tiling
    Voronyi mosaic
    geometry of numbers
    number theory
    Opis:
    Georgii Voronyi (1868–1908) is one of the most famous scientists - mathematicians, who gave the "world science of Ukrainian soil". Still, his scientific achievements sparked the brilliance of ideas; he was recognized as one of the most brilliant talents in the field of number theory at the turn of the century. In his short life Georgii Voronyi has set out several new directions in contemporary number theory: analytic number theory, algebraic number theory, geometry of numbers, the real significance of his scientific achievements is now discovered in our day.
    Georgij Woronyj (po rosyjsku – Woronoj, 1868–1908) jest jednym z najbardziej znanych naukowców – matematyków, których dała "nauce światowej ziemia ukraińska". Jeszcze za życia jego osiągnięcia naukowe wywoływały zachwyt genialnością pomysłów, był uznany za jednego z najbłyskotliwszych talentów w dziedzinie teorii liczb na przełomie wieków ХІХ-ХХ. W ciągu swego krótkiego życia Georgij Woronyj zdążył wytyczyć kilka nowych kierunków we współczesnej teorii liczb: analityczną teorię liczb, algebraiczną teorią liczb, geometrię liczb, rzeczywiste znaczenie jego dorobku naukowego jest odkrywane obecnie, w naszych czasach.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2017, 4, 116; 159-162
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust hybrid synchronization control of chaotic 3-cell CNN with uncertain parameters using smooth super twisting algorithm
    Autorzy:
    Siddique, Nazam
    Rehman, Fazal
    Raoof, Uzair
    Iqbal, Shahid
    Rashad, Muhammad
    Powiązania:
    https://bibliotekanauki.pl/articles/27311427.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    hybrid synchronization
    cellular neural network
    sliding mode control
    smooth super twisting algorithm
    Lyapunov stability theory
    synchronizacja hybrydowa
    sieć neuronowa komórkowa
    sterowanie trybem przesuwnym
    teoria Lyapunova
    stabilność Lyapunova
    algorytm super skręcania płynny
    Opis:
    This paper presents the control design framework for the hybrid synchronization (HS) and parameter identification of the 3-Cell Cellular Neural Network. The cellular neural network (CNN) of this kind has increasing practical importance but due to its strong chaotic behavior and the presence of uncertain parameters make it difficult to design a smooth control framework. Sliding mode control (SMC) is very helpful for this kind of environment where the systems are nonlinear and have uncertain parameters and bounded disturbances. However, conventional SMC offers a dangerous chattering phenomenon, which is not acceptable in this scenario. To get chattering-free control, smooth higher-order SMC formulated on the smooth super twisting algorithm (SSTA) is proposed in this article. The stability of the sliding surface is ensured by the Lyapunov stability theory. The convergence of the error system to zero yields hybrid synchronization and the unknown parameters are computed adaptively. Finally, the results of the proposed control technique are compared with the adaptive integral sliding mode control (AISMC). Numerical simulation results validate the performance of the proposed algorithm.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 5; art. no. e146474
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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