Wyniki wyszukiwania

1

Skeleton - bilayer interaction and the shape of red blood cells

100%

Svetina S.

Cellular and Molecular Biology Letters

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1998

|

tom 03

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nr 4

The shapes of red blood cells with fluid interior depend on the properties of their membranes. The red blood cell membrane is composed of a bilayer, containing integral proteins, and the underlying membrane skeleton, which are attached to each other through different specific and nonspecific linkages. A short account is given of theories of shape formation based on the description of the membrane as a single- or multi-layered elastic continuum. Existing experimental evidence is then outlined which indicates that some relevant shape determining factors reside in the specific properties of different red blood cell integral and skeletal proteins. In this context a theoretical approach is introduced, based on the chemical equilibria established by the interacting skeletal and integral proteins. A simple prototype model is analyzed, taking into consideration that the binding between integral membrane proteins and the skeleton depends on membrane curvature. The essential parameters of the model are the gross value of the corresponding interaction energy and the coefficient measuring the dependence of this energy on membrane curvature. The effects of these parameters on RBC shapes and on the lateral mobility of integral membrane proteins are demonstrated.

2

Effect of the angle in incidence of a stimulating light beam on phototactic orientation of Amoeba proteus

75%

Lazowski K., Kuznicki L.

Acta Protozoologica

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1991

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tom 30

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nr 2

3

A role of membrane skeleton in discontinuous red blood cell shape transformations

75%

Iglic A., Svetina S., Zeks B.

Cellular and Molecular Biology Letters

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1996

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tom 01

|

nr 2

A possible physical interpretation of a discontinuous transition between different red blood cell shapes is given. The red blood cell membrane is considered to consist of the bilayer part and the underlaying membrane skeleton. By taking into consideration that the stable cell shape corresponds to the minimum of the membrane energy, that consists of the bilayer and skeleton elastic energies and of the bilayer-skeleton interaction energy, it is shown that aggregation of the skeleton can cause the discontinuous cell shape transformation from a shape with the bilayer completely underlaid with the skeleton to the shape involving a spherical parent cell with completely underlaid bilayer and spherical daughter vesicles without the skeleton.

4

Spreading-independent growth of normal fibroblasts in three-dimensional cultures

75%

Czyz J., Rajwa B., Bzowska M., Dobrucki J., Korohoda W.

Folia Biologica

|

2004

|

tom 52

|

nr 1-2

5

The shape of cells adhering to sulfonated copolymer surfaces

75%

Kowalczynska H. M., Nowak-Wyrzykowska M., Inkielman M., Stolowska L., Marciniak E.

Cellular and Molecular Biology Letters

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2005

|

tom 10

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nr 1

6

F-actin disrupting agents affect the fluid-phase endocytosis of human skin fibroblasts in culture

75%

Michalik M., Wianecka-Skoczen M., Korohoda W.

Cellular and Molecular Biology Letters

|

2002

|

tom 07

|

nr Suppl.

7

The effect of pendimethalin on plant microtubules

75%

Tarkowska J. A., Kossut E., Dobrzynska K.

Fragmenta Floristica et Geobotanica

|

1994

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tom 39

|

nr 1

8

The cytoskeleton proteins and LH-regulated steroidogenesis of porcine luteal cells

63%

Gregoraszczuk E. L., Slomczynska M.

Folia Histochemica et Cytobiologica

|

1996

|

tom 34

|

nr 1

9

Technique to monitor multiple shape transformation events caused by the interaction of red blood cells with biologically active substances

63%

Rudenko S. V.

Cellular and Molecular Biology Letters

|

1998

|

tom 03

|

nr 2

10

An improved method for the isolation of cells from tissues: prevention of cell rounding enhances spreading and locomotion of keratinocytes [epitheliocytes]

63%

Korohoda W., Wojciak B., Bereiter-Hahn J.

Folia Histochemica et Cytobiologica

|

1994

|

tom 32

|

nr 1

11

Cytoskeleton and red cell shape

51%

Svetina S., Iglic A., Kralj-Iglic V., Zeks B.

Cellular and Molecular Biology Letters

|

1996

|

tom 01

|

nr 1

A view is presented on different roles which the bilayer part of the membrane and the skeleton play in establishing normal and some abnormal RBC shapes. The system is first studied at the level of elastic properties of red blood cell membrane where the latter is considered to be a trilayered structure. Then the contributions to the membrane energy are introduced which cause the membrane to become laterally inhomogeneous, in particular, the skeleton-bilayer interaction, the interaction between the membrane embedded molecules and the membrane curvature, and the distributional free energy of membrane embedded molecules. It is invoked that the role of skeleton in stabilizing red blood cell membrane is in keeping membrane integral proteins laterally distributed as homogeneously as possible.

12

Method of parenchyma cells parametrisation using fluorescence images obtained by confocal scanning laser microscope

51%

Zdunek A., Umeda M., Konstankiewicz K.

Electronic Journal of Polish Agricultural Universities. Series Agricultural Engineering

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2004

|

tom 07

|

nr 1

Fruits and vegetables are built mainly of thin walled parenchyma cells highly susceptible to mechanical damage. According to experimental investigation of relationship between cells geometrical parameters and mechanical properties of tissue a new efficient method of structure reconstruction and parametrisation is elaborated and presented in this paper. Special sample preparation and way of image taking by Confocal Scanning Laser Microscope with fluorescence mode allows obtaining images of any number of cells. Unique computer procedure based on morphological operators was created that allows analysing automatically any number of images with extracting geometrical parameters of each cell separately. The method was tested on potato and carrot tissue. Results show that the method is fast and gives proper cell reconstruction for both materials. In order to decrease error of incorrect reconstruction, possibility of manual correction was introduced to the procedure.

13

Effect of artificial UV-B and simulated solar radiation on the flagellate Euglena gracilis: physiological, spectroscopical and biochemical investigations

51%

Gerber S., Hader D. P.

Acta Protozoologica

|

1995

|

tom 34

|

nr 1

14

Cell shape and cell adhesion

45%

Korohoda W., Wojciak B.

Biophysics of Membrane Transport

|

1992

|

tom 11

|

nr 1

Ograniczanie wyników

Skeleton - bilayer interaction and the shape of red blood cells

Effect of the angle in incidence of a stimulating light beam on phototactic orientation of Amoeba proteus

A role of membrane skeleton in discontinuous red blood cell shape transformations

Spreading-independent growth of normal fibroblasts in three-dimensional cultures

The shape of cells adhering to sulfonated copolymer surfaces

F-actin disrupting agents affect the fluid-phase endocytosis of human skin fibroblasts in culture

The effect of pendimethalin on plant microtubules

The cytoskeleton proteins and LH-regulated steroidogenesis of porcine luteal cells

Technique to monitor multiple shape transformation events caused by the interaction of red blood cells with biologically active substances

An improved method for the isolation of cells from tissues: prevention of cell rounding enhances spreading and locomotion of keratinocytes [epitheliocytes]

Cytoskeleton and red cell shape

Method of parenchyma cells parametrisation using fluorescence images obtained by confocal scanning laser microscope

Effect of artificial UV-B and simulated solar radiation on the flagellate Euglena gracilis: physiological, spectroscopical and biochemical investigations

Cell shape and cell adhesion