2,3-DPG. An organic phosphate in red blood cells that alters the affinity of hemoglobin for oxygen. Blood cells stored in a blood bank lose 2,3-diphosphoglycerate, but once they are infused, the substance is resynthesized or reactivated.
Definition of soft fold. : the fold that results when paper is lapped.
Fold (geology) - Describing folds. 1  Folds are classified by their size, fold shape, tightness, and dip of the axial plane. [2] 2  A fold surface seen in profile can be divided into hinge and limb portions. 3  The hinge points along an entire folded surface form a hinge line, which can be either a crest line or a trough line.