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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 ?
However, there is little information as to how free-living autonomous bacteria became semi-autonomous organelles during endosymbiosis in early eukaryotic evolution.
rubrum as a model to understand how it rewires its cellular machinery to support foreign organelles, allowing it to photosynthesize without any genetic ability to do so.
Some evidence already suggested the distribution of organelles, including energy-producing mitochondria, can influence the outcome of cell division.
Shows the organelles in 3-D so you can better understand the arrangement of the cell.
Furthermore, a family of calcium-dependent cysteine proteases--calpains--occur in abundance in the lens and play a crucial role in organelle degradation and programmed cell death [29-31].
Molecules that are to be broken down are enclosed in a membrane sack that forms an organelle called an autophagosome.
Thermo Fisher Scientific has introduced two new Thermo Scientific Sorvall Micro-ultracentrifuge models with improved versatility in rapid, small volume processing of samples including viruses, cellular organelles, lipoproteins, nucleic acids and nanoparticles.
Within this aqueous medium are even smaller structures, organelles (or, little organs) of various shapes and sizes.
It supports energy utilization by transport of fatty acids into myocellular mitochondria, as well as removal of waste substances from these organelles.
Autophagy," the process by which cells cannibalize some of their internal organelles for re-use when faced with an inadequate supply of nutrients, is a quarterly journal that is designed to serve as a forum for the exchange of information on the range of autophagic developments, including specific degradation, the molecular mechanism of autophagy, signaling and regulation, the role of autophagy in diseases including cancer, its connection with aging, and the immune response.
MDMs treated with C particulates exhibited morphologic evidence of macrophage activation but no evidence of lysis of organelles.
Large, ill-defined areas of cytoplasm, containing ribosomelike and filamentous structures and devoid of other organelles, were noted in some SARS-CoV-infected cells (Figure 4A,B).