Half Life


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Half Life

In a pool of mortgages underlying a mortgage-backed security, the length of time it takes for half the aggregate principal to be repaid. A half life is normally about 12 years, but this may vary depending on how often homeowners refinance their mortgages (which pays off all principal at once). Half lives are calculated for mortgage-backed securities issued or guaranteed by Freddie Mac, Fannie Mae, and Ginnie Mae.
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In this way, doctors may have their questions answered as to the comparative half life and serum concentration of Epoetin Omega to that of NESP.
However, limitations associated with using free (unbound) IGF-I have proven significant: acute insulin effects (such as hypoglycemia), suppression of growth hormone secretion, short circulating half life, and limited and transient efficacy at safe dosage levels.
In traditional fortification methods, when added to grains, vitamin A delivers a half life of only 14-21 days.