As the temporal resolution of (18F FDG is very limited (half-life period of 110 min), we have averaged images during volume-induced voiding and isovolumetric bladder contractions.
Resist the temptation to, say, line your lab with a row of computers; computers have a limited half-life, and it might be years before you have such a nice packet of discretionary money again.
However, data on the presence of the protein in adipocytes are currently inconclusive, while a placental origin can be reasonably excluded, bearing in mind the limited half-life of the protein (about 1hour) [24].
However, the limited half-life failed to explain its in vivo efficacy.
One disadvantage is that the EIA kits have a limited half-life.
This system can circumvent the problems of limited half-lives and variation in circulating levels of therapeutically active proteins.
Because of their limited half-life, most patients require at least twice yearly injections of chemically-modified hyaluronic acid products.
As a result, researchers can manage the time constraints associated with the limited half-lives of isotopes.
However, growth factors have a limited half-life and are small in size, which restricts their retention within a tissue for prolonged periods.
However, antagonism of extracellular domains is only transient due to turn-over of surface receptors and limited half-time of serum contents.
