"functional lifespan" is a correct and usable phrase in written English.
It refers to the length of time that something remains in good working condition before it becomes obsolete or needs to be replaced. A possible example of using this phrase in a sentence could be: "The functional lifespan of a car can vary greatly, with some models lasting for over 200,000 miles while others may start having major issues after only 50,000 miles."
As a result we think less about its whole, functional lifespan and more about the rubbish left behind.
As a comprehensive review in Nature put it: "The functional lifespan of human ovaries is determined by a complex and yet largely unidentified set of genetic, hormonal and environmental factors".
Our data support a shortened functional lifespan for equine sperm in skim milk extender, which indicates that further refinements in cooled semen preservation are required to improve fertility of transported equine semen.
Novel approaches capable of gene "knockdown" or amplification", in vivo as well as in vitro, should identify novel or underappreciated gene products that are regulated by or modulate LH/CG actions to control the functional lifespan of the primate corpus luteum.
At sites of infection or potential infection (tissue injury), neutrophils are thought to have an extended functional lifespan [2], allowing the body to more evenly match neutrophil numbers with the numbers of rapidly dividing bacteria.
Thus, modulating pathways involving a change from COX-dependent respiration to AOX-dependent respiration does not seem to be a universal option for improving the functional lifespan (healthspan) of P. anserina.
Consistently, experimental disruptions of circadian rhythms seriously impede functional physiology, lifespan and endorse cancer incident (Filipski et al., 2003; Froy, 2013; Fu et al., 2002; Kondratova and Kondratov, 2012; Penev et al., 1998).
The wild mth lines exhibited functional differences in lifespan, fecundity and resistance to oxidative stress.
Our results demonstrate that natural variants of mth, a gene for aging in Drosophila, contribute to significant functional variation in lifespan, fecundity and resistance to oxidative damage.
Unlike most other cells, neurons must remain healthy and functional throughout the lifespan of an animal.
In complex forms, the functional handicap and lifespan will depend on the full clinical picture.
