L. Grębecka

Instytut Biologii Doświadczalnej im. Marcelego Nenckiego

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A. Grębecki

Instytut Biologii Doświadczalnej im. Marcelego Nenckiego

A. Wasik

Polish Academy of Sciences

Paweł Pomorski

National Academy of Medicine

Wanda Kłopocka

Cardinal Stefan Wyszyński University in Warsaw

B. Hrebenda

Instytut Biologii Doświadczalnej im. Marcelego Nenckiego

AŁ

A. Łopatowska

Instytut Biologii Doświadczalnej im. Marcelego Nenckiego

J Kołodziejczyk

University of Sheffield

Robert Makuch

Yale University

ANDRZEJ GRE

Instytut Biologii Doświadczalnej im. Marcelego Nenckiego

Kalinina Lv

Cooperative Institutions

Instytut Biologii Doświadczalnej im. Marcelego Nenckiego

Polish Academy of Sciences

Jagiellonian University

International Institute of Molecular and Cell Biology

University of Waterloo

Cardinal Stefan Wyszyński University in Warsaw

Institute of Cytology

University of Bonn

University of Sheffield

Wroclaw Medical University

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KOSMOS 50 i 100 lat temu

Kosmos (2020)

L. Grębecka

10.36921/kos.2020_2649

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Ultrastructure of the frontal cap of monotactic forms of Amoeba proteus.

PubMed (1978)

B. Hrebenda L. Grębecka

The frontal cap of the monotactic form of Amoeba proteus is separated from other cell components by a continuous structure defined as the "membrane-like envelope" (MLE). It originates from the membranes of cytoplasmic vesicles and vacuoles. The border zone between the cap and the cytoplasm is strongly vacuolized. Structural differences between frontal caps, depending on the degree of their development, indicate that the growing cap gradually fills up the whole tip of an advancing pseudopodium, and at the front it reduces the cortical layer in the interstice between the MLE and the outer cell membrane, up to its eventual disrupture. This is probably the efficient cause of the specific morphological and motory pattern of monotactic amoebae. These results and conclusions are supported by an ultrastructural analysis of the artificial frontal caps obtained by injecting oil droplets into polytactic cells, a procedure transforming polytactic forms into forms morphodynamically analogous to the natural monotactic amoebae.

Amoeba proteus

Contractile vacuole

Cell envelope

Pseudopodia

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Extracellular calcium changes the morphology of induced pinocytosis in Amoeba proteus

Acta Protozoologica (2003)

Wanda Kłopocka A. Wasik L. Grębecka

Summary. The morphology of pinocytosing Amoeba proteus induces by two monovalent cations: Na + and K + were examined at different calcium concentration. It was demonstrated that pinocytotic response of amoeba (number, size and shape of pinocytotic pseudopodia) was related to the amount of Ca 2+ accumulated on the cell surface.

Amoeba proteus

Pinocytosis

Pseudopodia

Morphology

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Kosmos 50 i 100 lat temu

Kosmos (2021)

L. Grębecka

Kosmos 50 i 100 lat temu

10.36921/kos.2021_2749

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