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.
In fact, because mature. RBCs don't even have a nucleus, these cells really can't do much of anything other than act as vessels for the. hemoglobin with which they are jam-packed. New RBCs are made in the marrow in the mature human. In the. marrow, there is a population of erythropoietic stem cells.