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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 ?
As a basis for study for multi-organelle organisms, we searched for the simplest suitable organism for the study of organellar division under several conditions using the eukaryotic phylogenetic tree shown in Fig.
Other bands in the sucrose zone with certain organellar membranes were not identified, because the developing ovaries are differentiating tissues with various densities of yolk granules.
Barraud-Lange et al., "Sperm nuclear vacuoles, as assessed by motile sperm organellar morphological examination, are mostly of acrosomal origin," Reproductive Bio-Medicine Online, vol.
Adachi et al., "MAPU: max-planck unified database of organellar, cellular, tissue and body fluid proteomes," Nucleic Acids Research, vol.
In general, the most significant effect of LPO in all cells is the perturbation of membrane (cellular and organellar) architecture and function (transport processes, maintenance of ion and metabolite gradients, and receptor mediated signal transduction).
Organellar detail was difficult to ascertain because the material was originally processed for paraffin sections.
The genes encoding all the subunits of V-ATPases are present in nucleus, while the genetic information for F- ATPases is shared by the nuclear and organellar DNA [17].
So the seven hierarchical levels here appear to actually be four or five, given just the mass data, and depending on your confidence in how near to each other are the molecular and organellar levels.
To maintain this organization, organellar proteins must be faithfully targeted and transported from the cytosol to their final destination.
Instead, the multiple copies of the organellar genome are compacted into complexes known as nucleoids by a set of proteins.
We also identified and monitored a genomic and an organellar polymorphic marker and applied these to 17 different isolates from a wide geographic range.