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Wyszukujesz frazę "Pietruszka, M." wg kryterium: Autor

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    Tytuł:
    Simple method to estimate cell wall extensibility coefficient by using only two cardinal numbers
    Autorzy:
    Pietruszka, M
    Powiązania:
    https://bibliotekanauki.pl/articles/58740.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    cell wall
    plant cell
    growing plant
    temperature
    extensibility coefficient
    Opis:
    In this short communication we consider the extensibility properties of the cell wall. This is accomplished by a heuristically motivated equation for the expanding volume of the cell. The experimentally determined characteristic time t0 and temperature T0 are the only numbers required for evaluating the effective yielding coefficient Ф(t, T) in the respective time and temperature domains.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2009, 78, 4; 269-270
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Derivation of the formula for the filtration coefficient by application of Poiseuilles law in membrane transport
    Autorzy:
    Jarzynska, M
    Pietruszka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/59171.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    mathematical analysis
    membrane
    filtration coefficient
    Kedem-Katchalsky equation
    viscosity coefficient
    membrane transport
    Poiseuille's law
    Opis:
    On the basis of Kedem-Katchalsky equations a mathematical analysis of volume flow (Jv) of a binary solution through a membrane (M) is presented. Two cases of transport generators have been considered: hydrostatic (Δp) as well as osmotic (Δπ) pressure difference. Based on the Poiseuille's law we derive the formula for the membrane filtration coefficient (Lp) which takes into account the membrane properties, kinetic viscosity and density of a solution flowing across the membrane. With use of this formula we have made model calculations of the filtration coefficient Lp and volume flow Jv for a polymer membrane in the case when the solutions on both sides of the membrane are mixed.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2009, 78, 2; 93-96
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Central limit theorem and the short-term temperature response of coleoptile and hypocotyl elongation growth
    Autorzy:
    Lewicka, S
    Pietruszka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/56965.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    temperature
    coleoptile
    hypocotyl
    elongation growth
    temperature response
    plant biology
    Opis:
    In this contribution we deal with a new mathematical description of the response of short-term coleoptile/hypocotyl expansion growth to temperature. Although the interest of both the bio-mechanical basis of elongation growth and temperature responses has been studied in plant biology and biophysics for a long time, yet the question of the mode of actions of temperature is very relevant and still open. Here we introduce a simple idea that the normal distribution, due to the central limit theorem (CLT), is able to report on temperature-dependent elongation growth. The numerical fittings for temperature affected growth are in good agreement with empirical data. We suggest that the observation concerning a crossover effect occurring in temperature driven elongation together with CLT leads to the formulation of a hypothesis about the possible universal character of such a description, supposedly for many plant species and families. We conclude with the statement that properly constructed equations of temperature affected growth, should possibly include a specific term proportional to exp[-((T-T0)/T0)2] with T0 corresponding to the temperature of the optimum growth.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2008, 77, 4; 289-292
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical model for tissue stresses in growing plant cells and organs
    Autorzy:
    Lewicka, S
    Pietruszka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/57317.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    growing plant
    plant cell
    mathematical model
    tissue stress
    equilibrium equation
    plant organ
    Opis:
    In this study we propose a simple mathematical model based on the equilibrium equation for the materials deformed elastically. Owing to the turgor pressure of the cells, the peripheral walls of the outer tissue are under tension, while the extensible inner tissue is under compression. This well known properties of growing multicellular plant organs can be derived from the equation for equilibrium. The analytic solutions may serve as a good starting point for modeling the growth of a single plant cell or an organ.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2009, 78, 1; 19-23
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamics of irreversible plant cell growth
    Autorzy:
    Pietruszka, M
    Lewicka, S.
    Pazurkiewicz-Kocot, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/58662.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    thermodynamics
    irreversible process
    plant cell
    plant growth
    cell wall
    yielding
    growth stimulator
    growth inhibitor
    modified growth equation
    Opis:
    The time-irreversible cell enlargement of plant cells at a constant temperature results from two independent physical processes, e.g. water absorption and cell wall yielding. In such a model cell growth starts with reduction in wall stress because of irreversible extension of the wall. The water absorption and physical expansion are spontaneous consequences of this initial modification of the cell wall (the juvenile cell vacuolate, takes up water and expands). In this model the irreversible aspect of growth arises from the extension of the cell wall. Such theory expressed quantitatively by time-dependent growth equation was elaborated by Lockhart in the 60's.The growth equation omit however a very important factor, namely the environmental temperature at which the plant cells grow. In this paper we put forward a simple phenomenological model which introduces into the growth equation the notion of temperature. Moreover, we introduce into the modified growth equation the possible influence of external growth stimulator or inhibitor (phytohormones or abiotic factors). In the presence of such external perturbations two possible theoretical solutions have been found: the linear reaction to the application of growth hormones/abiotic factors and the non-linear one. Both solutions reflect and predict two different experimental conditions, respectively (growth at constant or increasing concentration of stimulator/inhibitor). The non-linear solution reflects a common situation interesting from an environmental pollution point of view e.g. the influence of increasing (with time) concentration of toxins on plant growth. Having obtained temperature modified growth equations we can draw further qualitative and, especially, quantitative conclusions about the mechanical properties of the cell wall itself. This also concerns a new and interesting result obtained in our model: We have calculated the magnitude of the cell wall yielding coefficient (T) [m3 J-1•s-1] in function of temperature which has acquired reasonable numerical value throughout.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2006, 75, 3; 183-190
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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