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Related to Cell organelle: mitochondria, endoplasmic reticulum


(cell and molecular biology)
A specialized subcellular structure, such as a mitochondrion, having a special function; a condensed system showing a high degree of internal order and definite limits of size and shape.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a part of the body of a unicellular organism, or protozoan, that performs any one of various functions. Organelles are especially diverse and complex in Infusoria and Flagellata. There are several types of organelles. Skeletal and support organelles protect the organism from mechanical, chemical, and other harmful effects (for example, the shells of Sarcodina and Infusoria). There also are locomotor and contractile organelles (for example, flagella, cilia, and myonemes); sensory, or receptor, organelles (for example, photosensitive ocelli); and attack and defense organelles (for example, in Infusoria, the rod-shaped formations known as trichocysts, which are discharged from the body). Digestive organelles capture, conduct, and digest the food (for example, the digestive vacuoles of Infusoria). There are also excretory and secretory organelles (for example, the pulsating vacuoles of Infusoria). The term “organelle” is often used as a synonym for “organoid.”

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Also our previous study showed that apoptosis caused by I/R injury may be due to action endonuclease or by acting on cell organelles, alternating signal transduction pathways or affecting the intracellular enzymes responsible for proper functioning and survival of the cell [11, 12].
They've also found specific phosphorylation sites of cell proteins, identified immunolabeled antigens within cells, and determined the water content of cell organelles -- all useful facts for deciphering basic cell mechanisms.
Thinner than a human hair, the new nanoneedle distributes molecules directly to the right organelles, doing away with the problem of the cell organelles' failure to collect and use drugs released into the bloodstream.
Plants feature molecular complexes called photosystem I and photosystem II, which reside in stacks of membranes within cell organelles called chloroplasts.
"Because the capsosomes are biodegradable and non-toxic, they would also be suitable for use as resorbable synthetic cell organelles and for the transport of drugs", said Brigitte Staedler, a senior researcher in the group.