primitive cell

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primitive cell

[′prim·əd·iv ′sel]
(crystallography)
A parallelepiped whose edges are defined by the primitive translations of a crystal lattice; it is a unit cell of minimum volume.
References in periodicals archive ?
The researchers traced the trajectories of primitive cells from mouse neural crest tissue -- a collection of cells that arise from the ectoderm, one of the primary germ-cell layers formed during embryonic development.
Section shows fragments of a neoplasm with highly cellular area composed of cells arranged in diffuse sheets; multilayered rosette: true rosettes lined by multiple layers of primitive cells were seen (Fig.
(27) The neurogenic population is made up of small primitive cells with a high nuclear to cytoplasmic ratio.
Sequential pathology of endometrial biopsy displayed that the tumor was composed of monotonous small round primitive cells with high nuclear-to-cytoplasmic ratio in papillary, nest, and sheet patterns [Figure 2]a with Homer-Wright rosettes [Figure 2]b.
The primitive cells of Ge(111) surface and 4H-SiC(0001) surface possess lattice constants of [[01 -1].sub.Ge] = 4.000 [Angstrom], [[11-20].sub.SiC] = 3.078 [Angstrom].
Several studies have suggested that the degree of efflux activity of SP cells is inversely correlated to their maturity, with the most primitive cells (the stem/progenitor cells) having the greatest efflux activity due to the high concentration of efflux proteins on their surface [13, 25, 26].
These primitive cells can differentiate themselves and as such help in the repair of damaged organs at a later date."
For example, the most primitive cells, bacteria, are surrounded by rigid "capsules" (the equivalent of the exoskeleton found in insects, clams, and lobsters).
Right: A strong desmin reaction is seen in the cytoplasm of the primitive cells.
In principle, just one of these primitive cells can create much of a human being's immune system, not to mention the complex slurry of cells that courses through a person's arteries, veins and organs.
Primitive neuroectodermal tumor (PNET) is thought to arise from primitive cells of neural crest.