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.
When the tube of blood is removed from the centrifuge, the components have separated into three layers: blood plasma, the buffy coat containing platelet cells, and red blood cells. Blood-spinning is a medical procedure used to shorten the healing time of an injury. Small samples of the patient's blood are taken and spun in a centrifuge, allowing platelets and blood plasma to be isolated from other blood components. The platelets and plasma are then combined forming platelet-rich plasma (PRP), which has high concentrations of natural growth factors.