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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 ?
It is precisely the ability to look into those cells at this new resolution - really at the scale of what happens inside individual organelles within those cells - that is enabling us to do just that.'
Madam, the life ensuring organelle of a cell in the form of a nucleus containing chromosomes is being covered by a porous gated nuclear membrane.
"This research showed the membraneless organelles are actually promoting a reaction by bringing together SPOP and its substrate, in this case, DAXX, so the reaction can take place."
4i makes it possible to observe the spatial distribution of at least 40 proteins and their modifications in the same cell for hundreds of thousands of cells simultaneously at various levels, from the tissue down to the organelle level.
Magnelle (magnetic organelle) contrast agents are being launched commercially this month, and create magnetic resonance imaging (MRI) beacons in a variety of cell therapies.
However, the researchers believe their finding offers a promising pathway for developing treatments to restore neurons' ability to disassemble the organelles when their cellular purpose has ended.
In almost all organism after the multiplication of cells and organelles during the non-sexual reproduction phase, the cells and organelles enter the sexual reproduction phase (Fig.
Meanwhile, Johnson joined WHOI in 2009, where he has conducted research on protozoa that steal chloroplasts and other organelles for their own use (a phenomenon known as kleptoplasty) and algae that continue to live inside other organisms (a phenomenon called endosymbiosis).
"Our experiments suggest an unexpected role for the positioning and inheritance of cellular organelles, in this case enzyme-filled peroxisomes, in controlling this intricate balance," said senior author Elaine Fuchs.
A gut microbe collected from chinchilla droppings might be the first complex life-form to lack even a shred of a supposedly universal organelle.
Wake, "Size Control in Biology: From Organelles to Organisms" is comprised of eighteen major papers by experts in their respective fields.
In general, students explained their preference for the shaded three-dimensional representation in terms of the clarity with which this form portrayed the organelles and internal structure of the cell.