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(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.



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.”

References in periodicals archive ?
GeneTex's new line of organelle markers have been thoroughly validated to ensure target specificity and optimal signal intensity," says Dr.
The fact that there was no distortion or displacement of organelles would indicate that the scraping and other aspects of the harvesting procedure did not hinder the interpretation.
Mitochondria are the powerhouses of eukaryotic cells, the little organelles that manufacture adenosine triphosphate (ATP), the universal energy currency in eukaryotes.
Define and measure cells, organelles, or other biological structures, and the relationships between them, with greater ease.
Finally, the energetics of cellular physiology beyond the organelles, including signal regulation throughout the cytoplasm, are covered.
Like the serene monk's cells they were originally named after, these cells are strangely quiet, almost lifeless, their various organelles inked into place like heavy furniture that cannot be shifted.
In this activity, students are also allowed to "bash" other students' assigned organelles, as long as their arguments are factual and not personal.
In the study, Children's Hospital Boston researchers found, mild-mannered organelles inside the cell known as peroxisomes can detect virus invasion signals and launch a limited antiviral offensive.
Examples of specific topics include mechanisms of lipid transport involved in organelle biogenesis in plant cells, molecular circuitry of endocytosis at nerve terminals, vertebrate endoderm development and organ formation, signaling in adult neurogenesis, quantitative time-lapse fluorescence microscopy in single cells, mechanisms shaping the membranes of cellular organelles, coordination of lipid metabolism in membrane biogenesis, genetic control of bone formation, and asymmetric cell divisions and asymmetric cell fates.
The intense functional stimulation has been reported as potential cause for morphologic changes in subcellular structure, involving those organelles where steroids are synthesized, such as smooth endoplasmic reticulum and mitochondria (Simpson and Waterman 1988; Soldani et al.
Micronemes and rhoptries are specialized secretory organelles of the Apicomplexa, whose contents are thought to be essential for successful invasion of host cells.
Detection of molecular interactions in living cells is not limited to the nuclear compartment, but can be accomplished in the cytoplasm, cell surface, organelles, or between these entities.