Pseudopodium

(redirected from pseudopodia)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

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 Since the pseudopodia can appear and be withdrawn again in different parts of the cell, the shape of the cells in amoeboid locomotion is constantly changing.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 ?
Wide excision with negative margins is the optimal strategy for the management of pleomorphic adenomas due to occasional lack of encapsulation, mixing into normal host tissue and pseudopodia.
The haemo-lymphocytes could possess pseudopodia for adhering to, or embracing Sheep Red Blood Cells (SRBC), and after incubation, haemo-lymphocytes were surrounded by numerous SRBC.
Mitchell indicates that she would like to talk with them about Pseudopodia and how they got the idea for it; she also mentions that though she used to be a newspaper reporter, she had never been interviewed before, which seems unlikely given the publicity Gone with the Wind received prior to publication (Letter to Lillian Smith, 4 May 1936).
Human platelets have pseudopodia and intracellular a-granules as well as surface-connecting canaliculi; bovine platelets have a smooth surface, a-granules, as well as distinctive dense bodies in the cytoplasm and buffalo platelets closely resembled that of bovine platelets.
Coverage includes salivary biomarkers, tumor markers in pseudopodia for invasive migration, intraocular lymphoma markers, serum tumor markers in breast cancer, diagnostic classification using gene expression profiling in AML, tumor antigens as markers of minimal residual disease in acute myeloid leukemia, activity and expression of dipeptidyl peptidase IV and cathepsin H in human cutaneous melanoma compared to other common cancers, ovarian cancer detection, comparison of the prognostic association of nucleolar size between uveal and conjunctival melanoma, biomarkers of hepatocellular carcinoma, cell adhesive markers in metastasizing colorectal carcinoma, and fetal hemoglobin as an oncofetal marker.
4) The tumor cells then gain motility by extending pseudopodia.
But a clot floating in water is something else, it remains diaphanous and intact even while those little protuberances like the pseudopodia of a handsome amoeba are swaying around.
So follow that ancestral line down, furry paw to scaly foot, amphibious foot to fin to tail to pseudopodia, flagella, and cilia.
Hematocytes were observed under a light microscope at 2-min intervals, and only the most abundant cell type, namely, the smaller hyaline and agranular hematocytes with pseudopodia, were considered.
A test, in the form of a bag or sack with one orifice (two in few genera) for the emergence of filose orlobose pseudopodia characterizes these organisms.
Arrangement of F-actin and microtubules in the pseudopodia of Cryptochlora perforans (Chlorarachniophyta).
The cytoplasm of some young trophozoites appeared spread out into the network of irregular pseudopodia, and the chromatin was distributed into fragments, conforming to the tenue forms.