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Biological immortality. Biological immortality refers to a stable or decreasing rate of mortality from cellular senescence as a function of chronological age.

Biological immortality

Various unicellular and multicellular species may achieve this state either throughout their existence or after living long enough. A biologically immortal living being can still die from means other than senescence, such as through injury or disease. This definition of immortality has been challenged in the new Handbook of the Biology of Aging,[1] because the increase in rate of mortality as a function of chronological age may be negligible at extremely old ages, an idea referred to as the late-life mortality plateau. The rate of mortality may cease to increase in old age, but in most cases that rate is typically very high.[2] As a hypothetical example, there is only a 50% chance of a human surviving another year at age 110 or greater.

The term is also used by biologists to describe cells that are not subject to the Hayflick limit. Cell lines[edit] Animals That are Immortal : "Negligible Senescence" Sep 1, 2004 (Updated Sep 10, 2004) Popular Products in Books From $10 From $5 The Bottom Line Mother asked us to share a little known fact or topic that we know about or have discovered.

Animals That are Immortal : "Negligible Senescence"

I looked to the field of science to find my topic. This in my entry to Mothermeatloaf's I Didn't Know That W/O. What?? There is an Emerging Area of Aging Research: Long-lived Animals with "Negligible Senescence". However, when these animals are kept in zoos free from the external factors that would kill them, they simply grow indefinitely, with almost no decrease of their physical functions- even after reaching full sexual maturity. Classic examples of species exhibiting both of these traits (mortality and immortality) are the Flounder and the Rockfish. Some interesting facts about these Animals with Negligible Sencescence: Recent research showes that whales can live over 200 years.

Zoos have also compiled longevity information. Update:Another study I just found (link provided below) by Dr. Forever young: Kira Cochrane on how celebrities put an end to ag. A couple of months ago, a photograph was hungrily circulated around gossip magazines and websites, and at a glance you would have had trouble explaining why.

Forever young: Kira Cochrane on how celebrities put an end to ag

It showed an ordinary-looking woman in her mid-40s, out shopping in California, her specs on, cardigan buttoned. The clue was in the picture of Madonna that ran beside it. The anonymous woman was identified as the singer's younger sister, Melanie Henry, and readers were encouraged to compare and contrast.