scholarly journals Random Characteristics of the Amoeboid Motion

2006 ◽  
Vol 46 (2) ◽  
pp. 70-75
Author(s):  
Yoshimi TSUCHIYA ◽  
Noritaka MASAKI ◽  
Hiromi MIYOSHI
Keyword(s):  
Amoeboid Motion

scholarly journals Amoeboid motion in confined geometry

2015 ◽  
Vol 92 (5) ◽  
Author(s):  
Hao Wu ◽  
M. Thiébaud ◽  
W.-F. Hu ◽  
A. Farutin ◽  
S. Rafaï ◽  
...  
Keyword(s):  
Confined Geometry ◽  
Amoeboid Motion

Capillary Suction Test of the Pressure Gradient Theory of Amoeboid Motion

Science ◽  
1972 ◽  
Vol 177 (4049) ◽  
pp. 637-638 ◽  
Author(s):  
G. S. Kirby ◽  
R. A. Rinaldi ◽  
I. L. Cameron
Keyword(s):  
Pressure Gradient ◽  
Gradient Theory ◽  
Capillary Suction ◽  
Amoeboid Motion

scholarly journals Analytical study for swimmers in a channel

2019 ◽  
Vol 881 ◽  
pp. 365-383 ◽  
Author(s):  
A. Farutin ◽  
H. Wu ◽  
W.-F. Hu ◽  
S. Rafaï ◽  
P. Peyla ◽  
...  
Keyword(s):  
Swimming Speed ◽  
Mammalian Cells ◽  
Analytical Study ◽  
Order Effect ◽  
Numerical Results ◽  
Normal Velocity ◽  
Numerical Studies ◽  
Geometric Confinement ◽  
Amoeboid Motion ◽  
Shape Changes

There is an overabundance of microswimmers in nature, including bacteria, algae, mammalian cells and so on. They use flagellum, cilia or global shape changes (amoeboid motion) to move forward. In the presence of confining channels, these swimmers exhibit often non-trivial behaviours, such as accumulation at the wall, navigation and so on, and their swimming speed may be strongly influenced by the geometric confinement. Several numerical studies have reported that the presence of walls either enhances or reduces the swimming speed depending on the nature of the swimmer, and also on the confinement. The purpose of this paper is to provide an analytical explanation of several previously obtained numerical results. We treat the case of amoeboid swimmers and the case of squirmers having either a tangential (the classical situation) or normal velocity prescribed at the swimmer surface (pumper). For amoeboid motion we consider a quasi-circular swimmer which allows us to tackle the problem analytically and to extract the equations of the motion of the swimmer, with several explicit analytical or semi-analytical solutions. It is found that the deformation of the amoeboid swimmer as well as a high enough order effect due to confinement are necessary in order to account for previous numerical results. The analytical theory accounts for several features obtained numerically also for non-deformable swimmers.

OBSERVATIONS ON AMOEBOID MOTION OF LIVING HAEMOCYTES IN THE WING VEINS OF BLABERUS GIGANTEUS (L.) (ORTHOPTERA: BLATTIDAE)

1959 ◽  
Vol 37 (3) ◽  
pp. 371-375 ◽  
Author(s):  
J. W. Arnold
Keyword(s):  
Cell Migration ◽  
Cytoplasmic Streaming ◽  
Confined Spaces ◽  
Granular Cytoplasm ◽  
Amoeboid Motion ◽  
Wing Veins

Haemocytes with finely granular cytoplasm moved independently in partly occluded wing veins of B. giganteus by two related but fundamentally distinct methods: (a) typical amoeboid motion that occurred generally on unobstructed vein walls and was characterized by cytoplasmic streaming into amorphous pseudopodia, and (b) atypical amoeboid motion, without visible cytoplasmic streaming, that involved the projection of hyaline ectoplasm into tactile and adhesive filiform or lamellar pseudopodia. By the atypical method the cells became oriented and entered into confined spaces. Speed of movement varied but approximated 5 microns per minute with typical amoeboid motion and 3.5 with the atypical during pronounced cell migration. Haemocytes with hyaline cytoplasm, coarsely granular cytoplasm, or cytoplasm that contained numerous globules moved comparatively little and only by the atypical method.

scholarly journals Capillary Suction Test of the Pressure Gradient Theory of Amoeboid Motion

Science ◽  
1972 ◽  
Vol 177 (4049) ◽  
pp. 636-638 ◽  
Author(s):  
T. L. Jahn ◽  
J. J. Votta ◽  
G. S. Kirby ◽  
R. A. Rinaldi ◽  
I. L. Cameron ◽  
...  
Keyword(s):  
Pressure Gradient ◽  
Gradient Theory ◽  
Capillary Suction ◽  
Amoeboid Motion

scholarly journals A Mathematical Model for Cellular Locomotion Exhibiting Chemotaxis

2001 ◽  
Vol 3 (2) ◽  
pp. 101-123 ◽  
Author(s):  
M. J. Holmes ◽  
B. D. Sleeman
Keyword(s):  
Fundamental Problem ◽  
Cellular Biology ◽  
Thin Sheets ◽  
Dimensional Model ◽  
Key Factors ◽  
Forward Motion ◽  
Amoeboid Motion ◽  
Cellular Locomotion ◽  
Chemotactic Behaviour ◽  
Cellular Motion

A fundamental problem of cellular biology is to understand the mechanisms underlying cellular locomotion. Bacterial organisms may use appendages such as flagellae or cilia to facilitate motion. Amoeboid motion [6], exhibited by eucaryotic cells are seen to flatten onto surfaces and extend thin sheets of cytosol called lamellipodia. These in turn make attachments to the surface and by the initiation of internal contractions within the cell, a forward motion is achieved. The processes which govern this behaviour are extremely complex, however, key ingredients have been identified which may provide a sufficient basis for persistent cellular motion. These factors are osmotichydrostatic expansion and cellular contraction mediated by intracellular calcium ca2+. In this paper, we develop a simple two dimensional model for a non-muscle motile cell based on these two key factors. We show it is capable of producing persistent cellular motion and chemotactic behaviour.

Response : Capillary Suction Test of the Pressure Gradient Theory of Amoeboid Motion

Science ◽  
1972 ◽  
Vol 177 (4049) ◽  
pp. 638-638
Author(s):  
Robert D. Allen ◽  
Robert Zeh ◽  
John Condeelis ◽  
David W. Francis
Keyword(s):  
Pressure Gradient ◽  
Gradient Theory ◽  
Capillary Suction ◽  
Amoeboid Motion
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