But Dr. Collins seemed much less sanguine about manipulating the aging process to extend the human life span, calling that far less certain to happen over the next 40 to 50 years, though it could.
However, recent debate has centered on whether telomere length is correlated with body size rather than life span thereby calling into question the direct role of telomere length in chronological ageing [ 5].
The age defined by the absolute time after birth (budding) is called the chronological life span (CLS) [8].
Life history traits such as generation time or total life span are factors that are commonly called forth to explain differences in evolutionary rates detected between species, e.g. in mammals [ 79], in invertebrates [ 80] and in plants [ 81].
We found that mutations in a gene called daf-2 doubled life span.
In yeast, for example, they've found that increasing the activity of a single gene, called Sir2, can significantly extend life span.
The life span based on stage (No. scars) is called replicative life span (RLS) [7].
For emergency systems with lower numbers of calls, the limited life span (12 weeks) of the cartridges could result in wastage.
The landfill's life spanned what waste experts call the Age of Disposability in the 1970's and 1980's, when the use-and-toss lifestyle of butane lighters and plastic foam hamburger boxes reached its pinnacle.
Old age, also called senescence, in human beings, the final stage of the normal life span.
If extended life span comes with prolonged frailty, or if enhanced altruism compromises survival skills, the overall value of the enhancement can be called into question (Shickle 2000).
