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Encyclopedia > Cell junction

A cell junction is a structure within a tissue of a multicellular organism. Cell junctions are especially abundant in epithelial tissues. They consist of protein complexes and provide contact between neighbouring cells, between a cell and the extracellular matrix, or they built up the paracellular barrier of epithelia and control the paracellular transport. Biological tissue is any substance made up of cells that perform a similar function within an organism. ... Multicellular organisms are those organisms containing more than one cell, and having differentiated cells that perform specialized functions. ... In biology and ecology, an organism (in Greek organon = instrument) is a living complex adaptive system of organs that influence each other in such a way that they function as a more or less stable whole. ... In zootomy, epithelium is a tissue composed of a layer of cells. ... A representation of the 3D structure of myoglobin, showing coloured alpha helices. ... Cells in culture, stained for keratin (red) and DNA (green). ... In biology, extracellular matrix (ECM) is any material part of a tissue that is not part of any cell. ...


In vertebrates, there are three major types of cell junctions: Classes and Clades See below Vertebrata is a subphylum of chordates, specifically, those with backbones or spinal columns. ...

simplified diagram of the main cell junctions
simplified diagram of the main cell junctions

Invertebrates have several other types of specific junctions, for example Septate junctions or the CeAJ (C. elegans apical junction). Adherens junctions share the characteristic of anchoring cells through their cytoplasmic actin filaments . ... Cell adhesion in desmosomes A desmosome (also known as macula adherens) is a cell structure specialized for cell-to-cell adhesion. ... A gap junction is a junction between certain animal/plant cell-types that allows different molecules and ions to pass freely between cells. ... Tight junctions, or zonula occludens, are the closely associated areas of two cells whose membranes join together forming a virtual impermeable barrier to fluid. ... Image File history File links Cell_junction_simplified. ... Image File history File links Cell_junction_simplified. ... Binomial name Caenorhabditis elegans Wild-type C. elegans hermaphrodite stained to highlight the nuclei of all cells Caenorhabditis elegans () is a free-living nematode (a roundworm), about 1 mm in length, which lives in a temperate soil environment. ...


External links

Cell junctions - edit
Adherens junction | Desmosome | Hemidesmosome | Gap junction | Tight junction

  Results from FactBites:
 
Triple-junction array generates kilowatt power (June 2004) - News - Compound Semiconductor (362 words)
The solar concentrator array, which was deployed near to the summit of Mount Haleakala, on the island of Maui in Hawaii, used 240 Spectrolab GaAs P/N solar cells to convert sunlight into energy.
According to the team, the peak power output of one of the concentrator modules reached 670 W, almost twice that of a standard module based on silicon solar cells.
Improvements in array design that have already been identified, such as the use of wider cells and improved optics, ought to improve power output by 20%.
Gap junction - Wikipedia, the free encyclopedia (561 words)
A gap junction is a junction between certain animal cell-types that allows different molecules and ions to pass freely between cells.
In vertebrates, gap junction hemichannels are primarily homo- or hetero-hexamers of connexin proteins.
Gap junctions are particularly important in the cardiac muscle: the signal to contract is passed efficiently through the gap junctions, allowing the heart muscle cells to contract in tandem.
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