Wyniki wyszukiwania

1

On ionic transport through a high conductance locust K plus channel in various voltages

100%

Siwy Z., Grzywna Z. J.

Cellular and Molecular Biology Letters

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1999

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tom 04

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nr 4

The influence of voltage on ionic transport through a high conductance locust K+ channel (BK channel) has been investigated. The nature of ionic flow has been examined by power spectrum, Hurst analysis, generalised entropy and surrogate data sets. The ordering influence of voltage on ionic current behaviour has been found.

2

Biological versus synthetic membranes transport

81%

Grzywna Z. J., Simon A. M., Siwy Z.

Biophysics of Membrane Transport

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1994

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tom 12

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nr 1

3

On the crowd models for the patch-clamp data

81%

Grzywna Z. J., Siwy Z., Bashford C. L.

Cellular and Molecular Biology Letters

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1996

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tom 01

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nr 3

Patch clamp data of PETP track-etched membranes have been analysed by the crowd model based on three i.e. regular, exponential and delayed maps of the logistic family. The same data were worked out for all equations, indicating expressive difference between theoretical predictions of the models with constant coefficients and experimental data. The differences disappeared for suitably chosen time dependent coefficients. Some possibilities of relating the functional forms of the logistic coefficients to the "dynamical structure" of a membrane as well as "the memory" of a system have also been discussed.

4

On the self-similarity of the logistic map

81%

Grzywna Z. J., Liebovitch L. S., Siwy Z.

Cellular and Molecular Biology Letters

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1997

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tom 02

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nr 4

The self-similarity of a quadratic, one parameter logistic map was shown. Depending on the value of a constant, four different patterns were obtained and analysed. Only for the chaotic region (R = 4) the obtained patterns were almost independent of the resolution used (the frequency of probing). Some of the analytical operations used as standard tools in investigating the maps properties were also analysed and suitably altered, where necessary.

5

Ion current fluctuations in artificial ion track pores - power spectrum and generalized entropy

71%

Wolf A., Siwy Z., Korchev Y. E., Reber N., Spohr R.

Cellular and Molecular Biology Letters

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1999

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tom 04

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nr 4

The ion current through individual etched ion tracks (diameter ≈50 nm, length ≈12 µm) in a poly (ethylene terephthalate) membrane is recorded at pH 7 as function of applied voltage (-5V to +5V) across the membrane. With increasing voltage, the ion current changes abruptly from random oscillations to structured fluctuations. The power spectrum and the generalized entropy of the recorded current reminds of the potassium channel of a locust muscle cell.

6

Chaos in the potassium current through channels of locust muscle membrane

71%

Grzywna Z. J., Siwy Z., Fulinski A., Mellor I., Usherwood P. N. R.

Cellular and Molecular Biology Letters

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1999

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tom 04

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nr 1

The nonlinear, pseudo-periodic current of potassium ions through a high conductance locust K+ channel (BK channel) has been modelled by a two-parameter logistic map (“crowd model”). Data obtained by the patch clamp for different values of potential difference has been correlated with a mechanism of transport incorporating dynamical structure and morphology of pores in a membrane. The ordering influence of applied voltage upon ionic current behaviour has been found and explained within the “crowd model”.

Ograniczanie wyników

5 Cellular and Molecular Biology Letters

1 Biophysics of Membrane Transport

6 Siwy Z.

5 Grzywna Z. J.

1 Bashford C. L.

1 Fulinski A.

1 Korchev Y. E.

1 Liebovitch L. S.

1 Mellor I.

1 Reber N.

1 Simon A. M.

1 Spohr R.

1 Usherwood P. N. R.

1 Wolf A.

3 1999

1 1997

1 1996

1 1994

On ionic transport through a high conductance locust K plus channel in various voltages

Biological versus synthetic membranes transport

On the crowd models for the patch-clamp data

On the self-similarity of the logistic map

Ion current fluctuations in artificial ion track pores - power spectrum and generalized entropy

Chaos in the potassium current through channels of locust muscle membrane