| cell polarity | 1. <cell biology> In epithelial cells the differentiation of apical and basal specialisations. In many epithelia the apical and baso lateral regions of plasma membrane differ in lipid and protein composition and are isolated from one another by tight junctions. The apical membrane may, for example: be the only region where secretory vesicles fuse or have a particular ionic pumping system. 2. A motile cell must have some internal polarity in order to move in one direction at a time: a region in which protrusion will occur (the front) must be defined. Locomotory polarity may be associated with the pericentriolar microtubule organising centre and can be perturbed by drugs that interfere with microtubule dynamics. (26 Mar 1998) |
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| polarity | <physics> Literally having poles (like a magnet), but used to describe cells that have one or more axes of symmetry. <cell biology> In epithelial cells, the polarity meant is between apical and baso lateral regions, in moving cells, having a distinct front and rear. Some cells seem to show multiple axes of polarity (which will hinder forward movement). (18 Nov 1997) |
| polarity of translation | Decrease in the synthesis of proteins specified by genes distal to the operator and to the site of a nonsense, frameshift, deletion or insertion mutation in an operon. A mutation which produces polarity is called a polar mutation or a polarity mutation. (12 Dec 1998) |
| segment polarity gene | <molecular biology> A segmentation gene, responsible for specifying anterior posterior polarity within individual embryonic segments. In Drosophila, there are at least 10 such genes, for example gooseberry. (18 Nov 1997) |
| neuronal polarity | Distribution of specific functions to discrete cellular domains: for example axons and dendrites that have different molecular composition, morphology and ultrastructure and perform different functions. (18 Nov 1997) |
| egg polarity gene | A gene whose product distribution in the egg determines the anterior posterior axis of subsequent development. Best characterised in Drosophila: See: bicoid, maternal effect gene. (18 Nov 1997) |
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보험코드 | 성분/함량 | 구분/보험급여 |
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보험코드 | 성분/함량 | 구분/보험급여 |
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