Cell membrane see plasma membrane

cell organ A differentiated part of a cell that has a special function, such as a centrosome, organoid, or organelle.

cells of Semper (ARTHRO: Insecta) The cells of the crystalline eye cone, whose intercellular membranes form a cruciform pattern when the cone is seen in transverse section.

cell theory All organisms are composed of cell(s); a cell is the smallest unit of matter that is alive (functional unit) proposed by Schwann for animals in 1838-40; cells are the reproductive units of all organisms; cellular.

cellulae n.pl. [L. dim. cella, chamber] (ARTHRO: Insecta) Round or oval-like areas on the exocuticle of certain Cocci-dae (Lecaniidae); dermal pores; dermal cells.

cellular affinity (PORIF) Pertaining to the selective adhesiveness found among the cells.

cellulase n. [L. dim. cella, chamber] A digestive enzyme that hydrolyzes cellulose in food.

cellule n. [L. dim. cella, chamber] 1. A small cell. 2. (ARTHRO:

Insecta) A small area between the veins of an insect wing, usually a completely enclosed area.

'cellules en crois' (porif) Non-flagellated cells arranged in a tetraradial fashion in the amphiblastula of Calcaronea.

cell wall A thin, nonliving sheath or pellicle that lies outside the plasma membrane of certain animal cells; more generally applicable to plant cells.

celsius n. [Anders Celsius] The name of the temperature scale having 100 divisions or degrees between freezing (0 ) and boiling (100 ); abbrev. C.; formerly called centigrade.

cement n. [L. caementum, chips (now applied to a substance used as a "binder")] A substance produced by various invertebrates and utilized as an adhesive protective layer.

cement gland 1. Any of certain glands of invertebrates that secrete an adhesive substance. 2. (ACANTHO) A gland or glands near the male testes that secretes a binding medium that facilitates copulation with the female. 3. (ar-THRO: Crustacea) Specialized dermal cells of barnacles that secrete the calcareous substance of the valves. 4. (nemata) see caudal gland. 5. (rotif) see pedal glands.

cement layer 1. (ARTHRO: Chelicerata) In Acari, the outer layer of cerotegument. 2. (ARTHRO: Insecta) The thin layer outside the wax of certain insect bodies, that may consist of tanned protein or a shellac-like substance and may function in protecting the wax or take the form of mesh-work reservoirs of lipids.

cement sac That portion of an invertebrate oviduct that functions in covering eggs.

cenchrus n.; pl. cenchri [Gr. kenchros, millet] (ARTHRO: Insecta) In Hymenoptera, specialized lobes on the metano-tum of certain sawflies that contact with rough areas on the underside of the fore wing to hold them in place; sometimes functioning as a stridulatory apparatus.

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