DefinitionsThe movement of ocean water is one of the twoprincipal sources of discrepancy between dead reckonedand actual positions of vessels. Water in motion is called acurrent; the direction toward which it moves is called set,and its speed is called drift.
Human RBC precursors are obtained by (i) separating glycophorin A(+) (gly A(+)) cells using a magnetic cell sorting (MACS) technique and by (ii) ex vivo expansion of precursors BFU-E (burst forming unit-erythroid) on methylcellulose semi-solid culture media from mononuclear cells of cord blood.
3. a chemical that is transformed into another compound, as in the course of a chemical reaction, and therefore precedes that compound in the synthetic pathway: Cholesterol is a precursor of testosterone. 4. a cell or tissue that gives rise to a variant, specialized, or more mature form. preâ¢curâ²soâ¢ry, adj.recursor. n. 1. a person or thing that precedes and shows or announces someone or something to come; harbinger. 2. a predecessor or forerunner. 3. (Chemistry) a chemical substance that gives rise to another more important substance.