Pellicle


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Related to Pellicle: Dental pellicle

pellicle

[′pel·ə·kəl]
(cell and molecular biology)
A plasma membrane.
(invertebrate zoology)
A thin protective membrane, as on certain protozoans.

Pellicle

 

a condensed layer of cytoplasm on the body surface of many protozoans, such as flagellates and infusorians. It is sometimes thin and elastic and does not inhibit change in body shape. In other cases, it is solid and defines a constant body shape. The exterior of the pellicle is often sculptured, with denticles, papillae, ridges, or other formations. Study of the pellicle’s ultrastructure in the electron microscope shows that the pellicle is usually composed of two separated layers. Each layer, in turn, consists of two membranes, with a less dense, narrow fissure between them.

References in periodicals archive ?
The bacteria on the pellicle undergo cell to cell interaction via quorum sensing.
These glycoproteins form a coating on the teeth called the pellicle. The bacteria use proteins called lectins to bind to these glycoproteins and then produce acid on the surface of the teeth.
Many of the same sugars incorporated into the pellicle are related to blood type.
The second process is to subsequently and slowly pass the nuts through a hot-water-and-steam-heated tunnel to loosen remaining shell or pellicle and then onto a cleaning table with counter rotating rollers to pull off any remaining covering from the chestnut.
It has been variously described as a testate amoeba with a thin and flexible test (Cash & Hopkinson, 1909; de Saedeleer, 1934) and as a naked amoeba with stiffened pellicle (Schaeffer, 1926).
In the kitchen, the hams dry for 10 days to two weeks to create a pellicle, a hard exterior.
tinasilma 'som har hinna pa ogat, skumsynt' ('having a pellicle in one's eyes, dim-eyed') in Lonnrot's dictionary.
About the same time, he discovered that the pellicle that is necessary in the formation of vinegar from wine consists of a rod-like microorganism, Mycoderma aceti.
Canon's EOS-1NRS, with its pellicle mirror, can shoot 10 frames per second, but can't focus them automatically.
We might also recall Ralph Waldo Emerson's description of cracks in the "social edifice" and of the "invasion of Nature by Trade with its Money, its Steam, its Railroad, [which] threatens to upset the balance of man."(9) And then there was Henry David Thoreau, who said, "We are acquainted with a mere pellicle of the globe on which we live.
Minocycline may etch the tooth surface through long-term contact by attaching to glycoproteins in the acquired pellicle. It then may become oxidized on exposure to oxygen or bacterial activity.(26) Minocycline is also found in gingival fluid at a concentration five times that of serum and may intrinsically stain the enamel by diffusing through the pulp.(24) Minocycline's strong affinity for iron and its ability to form insoluble salts also may play a role.(23)(25)
Alternatively, some off-axis guiders use a full-aperture window called a pellicle that transmits most of the light to the film while reflecting 10 or 20 percent to the eyepiece.