(n.) A rhizopod. common in fresh water, capable of undergoing many changes of form at will. See Rhizopoda.
Example Sentences:
(1) An unprincipled coward with the backbone of an amoeba."
(2) Developing D. discoideum amoebae synthesize and secrete cAMP following the binding of cAMP to their surface cAMP receptor, a response called cAMP signaling.
(3) The relative amount of the crystals was measured in both amoeba strains on the basis of the integral extinction value.
(4) In amoeba cells the enzyme, like exo N-acetylglucosaminidase and acid phosphatase, is attached to the lysosomes, as it is sedimentable when homogenates are prepared in medium containing sucrose.
(5) Recent reports incriminating Acanthamoeba, a small free-living amoeba, wide-spread in environmental soils and waters, in acanthamoebic keratitis cases wearing soft contact lenses, drew attention to cleaning solutions for contact lenses.
(6) The amoeba, however, could not use yeasts, molds, or a green alga as a nutritional source.
(7) The drinking water was tested in chemical and bacteriological respects as well as on amoebas and rotaviruses.
(8) A new amoeba, isolated from well water in Gambia, West Africa, is described and named Phreatamoeba balamuthi n. g., n. sp.
(9) It was found that the uptake of this cation by the amoebae was fast in both species, conditions that modify the membrane potential (hyperpolarization and depolarization) produced changes in the fluorescence of the dye in agreement with its reported capability to detect variations in membrane potential.
(10) Alcian blue and Na+, both inducers of pinocytosis, differ in the manner with which they associate with the amoeba surface, suggesting the possibility of different pinocytosis-inducing sites on the amoeba surface.
(11) PHA-stimulated T-lymphocytes, depleted of T8-bearing cells by complement-mediated lysis, were unable to kill amoebae.
(12) Results show that the 3-D disc is mostly preceded by impressions of elastic amoeba-like deformations, whereas the 3-D egg is mostly preceded by the percept of a rotating flat ellipse.
(13) In contrast, incorporation by amoebae starving in suspension culture continued for 6-8 h. Similar patterns of [35S]sulphate incorporation were observed for two other strains of D. discoideum (strains AX2 and NC4) and for Polysphondylium violaceum.
(14) Focal contact sites are left behind on the glass surface ('footprints') when the amoeba moves away.
(15) Treatment during starvation of D. discoideum amoebae with micromolar amounts of A23187 causes an enhanced aggregation.
(16) Many trophozoite-target interfaces were outlined with a ring of polymerized amoeba actin, revealed by rhodamine-phalloidin staining of glutaraldehyde-fixed and Triton-X 100-extracted cells.
(17) Similar treatment of nonpathogenic amoebae had no effect on susceptibility to complement.
(18) An extracellular cyclic nucleotide phosphodiesterase was isolated from either growing cultures or aggregating amoebas of Dictyostelium discoideum.
(19) The establishment of amoebae leading to acute liver abscess was accompanied by significantly reduced levels of antibodies to the plasma membrane (PM) protein of E. histolytica, reduced direct macrophage cytotoxicity, and reduced anti-PM antibody-mediated macrophage-dependent cytotoxicity to amoebic trophozoites.
(20) When developing cultures of Dictyostelium discoideum are disaggregated at any time prior to cell wall formation and challenged to reinitiate development, amoebae will progress through the original sequence of morphogenetic stages, but the second time through they will do so in roughly one-tenth the original time, a process known as 'rapid recapitulation'.
Pseudopod
Definition:
(n.) Any protoplasmic filament or irregular process projecting from any unicellular organism, or from any animal or plant call.
(n.) A rhizopod.
Example Sentences:
(1) Under conditions of chemotaxis with activated serum beneath the filter, the neutrophil population oriented at the filter surface with nuclei located away from the stimulus, centrioles and associated radial array of microtubules beneath the nuclei, and microfilament-rich pseudopods penetrating the filter pores.
(2) In the latter case, the movement of lectin-receptor complexes occurs from membrane overlying peripheral microtubules into filament-rich pseudopods that exclude microtubules.
(3) The morphology of human leukocytes, the biochemistry of actin polymerization, and the theory of continuum mechanics are used to model the pseudopod protrusion process of leukocytes.
(4) In an activated serum gradient, colchicines, but not lumicolchicine, decreased the orientation of nuclei and centrioles, and caused a decrease in centriole-associated microtubules in concentrations as low as 10(-8) to 10(-7) M. These colchicines effects were associated with the rounding of cells and impairment of pseudopod formation.
(5) In the electron microscope administration of TSH was seen to induce well-known signs of endocytosis, such as formation of pseudopods and colloid droplets.
(6) In addition, some lymphocytes with pseudopods were detected both in alveolar lumen and in the interstitium.
(7) Sections at this region of high membrane turnover reveal a band of densely packed smooth vesicles with round and tubular profiles, some of which are associated with the pseudopod plasma membrane.
(8) The F-actin assembled by 60 sec is localized in these new pseudopods.
(9) The presence of the multivesicular body in the pseudopod or in the vicinity of the pseudopod of the lymphocyte may contribute to the migration.
(10) The ultrastructural studies suggest that the major Tg-induced changes (pseudopod formation and granule centralization) are consistent with a primary role for Tg to mobilize calcium; DPPE had very little effect on these ultrastructural changes.
(11) The secretion of thyroid hormones under the influence of pituitary thyrotrophin (TSH) from stores in the luminal colloid is initiated by elongation of microvilli and formation of pseudopods.
(12) The second stage of actin assembly, which peaks at 60 sec following an upshift in cAMP concentration, is temporally correlated with the growth of new pseudopods.
(13) (8) The development of platelet constriction, platelet pseudopods and the intracellular microfilaments are delayed in colchicinized clots, corresponding to the retardation of retraction.
(14) Bound CGP-ABY was cleared first from the tips of the projections and subsequently from the entire pseudopod surface.
(15) The actin-binding protein ABP-120 has been proposed to play a role in cross-linking F-actin filaments during pseudopod formation in motile Dictyostelium amebas.
(16) The formation of pseudopods is impaired and no microtubules are found in platelets in the presence of colchicine.
(17) When motility was compared between sublines, membrane ruffling and cellular translation were relatively unaffected by substrate, whereas pseudopodal extension was altered significantly by different substrates.
(18) After correcting for effects of pseudopods and platelet size on platelet diffusion and sedimentation, it still appeared that the small number of long pseudopods formed on human platelets could largely explain the unusually large alpha B values.
(19) No such changes were observed in non-sensitized M. In contrast, when immunosuppressants or immunomodulators were used, increases of pseudopod movement and pinocytosis, and excitation of cytoplasmic movement, were observed in both sensitized and non-sensitized M if compounds were cytotoxic.
(20) From the enlarged apical plasma membrane, pseudopods are formed.