aging coefficient (ac) or aged-child ratio or age composition; takes into account the numbers and areas at both ends of the age distribution simultaneously. ac is the total number of individuals aged 65 years and more, divided by the total number of individuals aged 14 years, multiplied by 100. herein, age composition in iranian popu1ations, according to different provinces, place of residence ...

Multicellular life evolved from simple unicellular organisms that could replicate indefinitely, being essentially ageless. At this point, split into two fundamentally different cell types: the immortal germline representing an unbroken lineage of division with no intrinsic endpoint and mortal soma, which ages dies. In review, we describe as clock-free soma clock-bound discuss aging respect to t...

We explore the aging transition in a network of globally coupled Stuart-Landau oscillators under discrete time-dependent coupling. In this coupling, connections among are turned ON and OFF systematic manner, having either symmetric or an asymmetric time interval. discover that depending upon period duty cycle ON-OFF intervals, region shrinks drastically parameter space, therefore promoting rest...