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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.
Immunoblotting revealed that the PRIP-type AQP was constitutively expressed during oogenesis in specific organellar membranes.
This shows that the supposed molecular, organellar, and cellular levels of the biohierarchy are in fact all on one level of magnitude, so are not three hierarchical levels in a series.
Separation of organellar and nuclear DNA is not necessary for many procedures that detect a marker of interest, whether nuclear or organellar, through application of the appropriate probes or primers to total genomic DNA.
Chan, "Mitochondrial dynamics is a distinguishing feature of skeletal muscle fiber types and regulates organellar compartmentalization," Cell Metabolism, vol.
In the extreme view, a parasite represents the equivalent of an organellar genome, tracking hosts with such fidelity that incongruent genetic structure between host and parasite is assumed to reflect stochastic genealogical processes or different evolutionary rates rather than the possibility of semi-independent species histories (e.
2002), and previous genetic work revealed limited organellar genetic structuring range-wide (Baker et al.
It is not known if this represents particularly dense cytoplasm or organellar DNA in concentrations of mitochondria and plastids in this region.
Coverage includes membrane, organellar, cytoskeletal, adhesive and communicating, and polarized cellular domains, and domains regulating gene expression.
During this development, dynamic structural changes of the organellar nucleoid have been observed that likely accompany differences in function of the protein-DNA complexes.