Absolute zero is the coldest possible temperature, at which no heat is left in a substance and its particles display no motion whatsoever. Absolute zero is equal to 0 K on the Kelvin scale, which is... Absolute zero is the coldest possible temperature, at which no heat is left in a substance and its particles display no motion whatsoever.
Serum is plasma that has been allowed to clot. It is prepared in the same way as plasma; however, the blood is collected into a tube with no anticoagulant. While spinning in the centrifuge, the clot moves with the cells to the bottom of the blood collection tube, leaving the serum on top.
Clot activator tube for serum determinations in chemistry testing. ensure mixing of clot activator with blood and clotting within 60 minutes. blood and allow blood to clot upright for 30 minutes before centrifuging for 10 minutes. Serum must be removed after spinning.