Pseudopodium

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pseudopodium

[‚süd·ə′pōd·ē·əm]
(botany)
A slender, leafless branch of the gametophyte in certain Bryatae.
(cell and molecular biology)
Temporary projection of the protoplast of ameboid cells in which cytoplasm streams actively during extension and withdrawal.
(invertebrate zoology)
Foot of a rotifer.

Pseudopodium

 

a temporary protrusion of cytoplasm in unicellular organisms (rhizopods, some flagellates, sporozoans, and myxomycetes) and in some multicellular organisms (leukocytes; macrophages; the eggs of sponges, coelenterates, and acoelomate tubellarians; some cells in tissue cultures).

Pseudopodia aid in amoeboid locomotion and enable the organisms to grasp food or foreign particles. Since the pseudopodia can appear and be withdrawn again in different parts of the cell, the shape of the cells in amoeboid locomotion is constantly changing. The formation of pseudopodia and amoeboid locomotion result from local changes in the surface tension of the cell and from little-studied mechanisms of overflow, contraction, extension, and liquefaction of the cytoplasm.

In amoebas, the pseudopodia are lobed or filiform. In foraminiferans and radiolarians, they are branched, thin, and long, and they coalesce with one another. The pseudopodia of sun animalcules contain a solid, elastic axial filament (axopodium), which is responsible for the flexibility and constancy of the shape of the organisms. The pseudopodia are usually digitiform or lobed in the amoeboid cells of multicellular organisms.

REFERENCE

Seravin, L. N. Dvigatel’nye sistemy prosteishikh. Leningrad, 1967.
References in periodicals archive ?
As more and more people find it preferable to outlaw certain weapons or to make it more difficult to acquire them (as more and more opinions flow into that possible pseudopod), there is an "erosion" of the NRA's position and it becomes increasingly difficult to "draw the line" (two other very common and related metaphors).
Yet, it was Williams's pseudopod design for Cameron that landed him his ILM job in the first place.
Greenberg, "A requirement for phosphatidylinositol 3-kinase in pseudopod extension," Journal of Biological Chemistry, vol.
Amoeboid Cells that resemble amoebae by forming pseudopods.
Because these filaments have no overall polarity, pseudopod extension is not likely to be generated by motor proteins acting on MSP filaments (Bullock et al., 1998).
Cells lacking ponticulin are less efficient in migrating up chemotactic gradients, apparently due to a loss of positional control of both anterior and lateral pseudopods. The pseudopods in ponticulin-minus cells appear to form normally; but during cell movement they undergo dramatic shifts in position relative to the substratum, a behavior never seen in cells containing ponticulin.
If a cell is on the rigid side of the matrix, I can argue that when the pseudopod stretches into the softer side of the matrix it will become more active, whereas the pseudopod in the rigid side will become less active.
(4) Characteristics demonstrated to distinguish dermoscopically SK-like melanomas from SKs include the blue-black sign, the blue-white veil, pseudopods or streaks, and a pigment network.
Amelobastomas are slow-growing with a tendency to spread into marrow spaces with pseudopods without concomitant resorption of trabecular bone.
In inflammatory response, the neutrophils among blood cells have a remarkable migration potency (chemotaxis) and can change their form by generating pseudopods toward the antigen.
Treatment of neutrophils with the chemotaxin, formylmethionylleucylphenylanaline, leads to a translocation of n-SMase to plasma membranes where it is involved in the spreading and the extension of pseudopods. In these cells, n-SMase seems to influence the distribution of Rac 1/2 and RhoA to the leading edge of migration as this polarized distribution is totally lost when n-SMase was inhibited [86].