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 Since the pseudopodia can appear and be withdrawn again in different parts of the cell, the shape of the cells in amoeboid locomotion is constantly changing.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 ?
Far be it from me to tell a successful author who has written a book probably destined to be read by as many people as Anthony Adverse how to write 300 words for little Pseudopodia, but I would like to suggest that you crawl up on your divan, drink another cup of that delicious black coffee you gave me, and just let it write itself, as you talked.
This group as now constituted includes the rhizoid amoebae which have one or more broad pseudopodia, and a firm shell.
Current research by Cho and Klemke (The Scripps Research Institute) describes not only the chemical control of extending and retracting cell pseudopodia, but also the mechanical isolation of pseudopodia proteins.
Little by little, putting out pseudopodia here and there, I secreted a race.
Nabi's lab is focused on the cell biology of cancer; he studies a number of cellular domains including lipid rafts and caveolae, the endoplasmic reticulum, focal adhesions, and tumor cell pseudopodia.
Hemocytes sampled after 120 h of emersion failed to retain neutral red, lacked pseudopodia and were assumed to be dead.
In particular, the membrane reserve is used by lymphocytes during the pseudopodia formation during migration [2], phagosome formation [3] during the processes of deformation during the blood cells passage through the capillaries [4].
His works were extreme, from his electrifying blood-pumping Megawatt to Pseudopodia, a solo that challenges the dancer to roll like tumbleweed, never letting his hands touch the floor.
In contrast, the majority of cells treated with the second isolated compound developed pseudopodia and attached to the culture plates (Fig.
It is observed that the sandblasted surface exhibits a quite round form with predicting a good adhesion and polished surfaces with variable roughness generates a more wide spread cells which are characterized by the formation of lamellipodes and fine specula-like pseudopodia [41].
The surface form of the cells at advanced infection displayed prolific pseudopodia that, in addition to the rest of the plasma membrane, were also active sites of virus release.
18) It is certain that this phenomenon is not flue to active phagocytosis, and that it is not connected with ameboid movement and formation of pseudopodia.