Fetal bovine serum specific cell type. When changing from batch to batch it is usual to adapt the cells to the new batch of material, for example, by mixing 50% of the old serum with 50% of the new serum and allowing the cells to acclimatise to the new material. Serum is stored frozen to preserve the stability of components such as growth factors. When serum is thawed, some precipitation may be seen. This is a normal phenomenon and it does not compromise the quality of serum in any way. The precipitate may be removed by transferring the serum to sterile tubes and
New Blood (Blood, Sweat & Tears album) New Blood (Blood, Sweat & Tears album) New Blood is the fifth album by the band Blood, Sweat & Tears, released in 1972. With David Clayton-Thomas leaving as lead vocalist to pursue a solo career after the release of "BS&T 4", a nearly wholesale personnel change occurred for "New Blood". Difficulties had arisen inside the group between its pop-rock and jazz factions, with Clayton-Thomas choosing to leave in early January 1972, along with founding member Fred Lipsius. Clayton-Thomas was briefly replaced by Bobby Doyle, and a photo of the band appeared in Down Beat showing a new lineup also including