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Life equations for the senescence process.

Xiaoping Liu1

  • 1Davis Heart and Lung Research Institute, Department of Internal Medicine, The Ohio State University College of Medicine, 420 West 12th Avenue, Columbus, OH 43210, USA.

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|November 11, 2017
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Summary
This summary is machine-generated.

This study introduces a new kinetic model for mortality, explaining survival, senescence, and the mortality plateau. It reveals a temperature-dependent mechanism linking biochemical processes to lifespan and demography.

Keywords:
LifespanMortality kineticsMortality plateauSurvival curve

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Area of Science:

  • Biophysics
  • Demography
  • Biochemistry

Background:

  • The Gompertz law describes mortality but lacks a clear kinetic mechanism and fails to explain mortality plateaus or temperature effects.
  • Existing models do not fully account for the complexities of aging and survival across different ages and environmental conditions.

Purpose of the Study:

  • To propose a reaction kinetics model for survival and senescence processes.
  • To derive a temperature-dependent mortality function that addresses limitations of the Gompertz law.
  • To explore the biochemical basis of senescence and its link to demography.

Main Methods:

  • Developed a reaction kinetics model with a time-dependent rate coefficient.
  • Derived a novel mortality function incorporating temperature dependence.
  • Obtained closed-form analytical expressions for average lifespan, maximal longevity, and temperature coefficients.

Main Results:

  • The new mortality function aligns with the Gompertz law at younger ages and predicts a mortality plateau at older ages.
  • Derived equations accurately estimate lifespan limits and predict maximal longevity.
  • The model explains survival curve tendencies and is consistent with recent cohort mortality data.

Conclusions:

  • Senescence arises from an imbalance between damaging and protecting energy, influenced by temperature.
  • The mortality plateau occurs when protecting energy reaches a minimum, a process dependent on temperature.
  • This research bridges biochemical mechanisms of aging with demographic observations.