| sieve tube | The structure within the phloem of higher plants that is responsible for transporting organic material (sucrose, raffinose, amino acids, etc.) from the photosynthetic tissues (e.g. Leaves) to other parts of the plant. Made up of a column of cells (sieve elements) connected by sieve plates. (18 Nov 1997) |
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| Sievert | <unit> The special name for the SI unit of dose equivalent. One sievert equals one joule per kilogram. The previously used unit, rem, is being replace by the sievert. One sievert is equal to 100 rem. Abbreviation: Sv (18 Nov 1997) |