a vertical series of sieve cells in the phloem, specialized for the conduction of food materials.
a single sieve cell.
(botany) an element of phloem tissue consisting of a longitudinal row of thin-walled elongated cells with perforations in their connecting walls through which food materials pass
- Sieve-tube element
sieve-tube element An elongated, food-conducting cell in phloem in angiosperms. Unlike the tracheary elements of xylem, sieve elements have living protoplasts when mature, but they lack a nucleus and are dependent upon companion cells for certain functions. At the ends of each sieve-tube element are sieve plates, areas of the cell wall containing numerous large […]
noun 1. an instrument with a meshed or perforated bottom, used for separating coarse from fine parts of loose matter, for straining liquids, etc., especially one with a circular frame and fine meshes or perforations. 2. a person who cannot keep a secret. verb (used with or without object), sieved, sieving. 3. to put or […]
adjective 1. (South African, slang) disgusting; sickening; nasty SIF somatotropin release-inhibiting factor
noun 1. either of two large rare arboreal lemuroid primates, Propithecus diadema or P. verreauxi, of Madagascar, having long strikingly patterned or coloured fur: family Indriidae