# Biology of Aging Comp Exam.txt

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1. Biology of aging Lifetable types
• Type I: Senescent population, INCREASE Mortality rate with age. DECREASE life expectancy with age. ie humans
• Type II: Non-senescent, CONSTANT mortality and life expectancy with age. ie bacteria
• Type III: Anti-senescent, DECREASING mortality and INCREASING life expectancy with age. ie large plants
2. How to decide what type and category based on life table
• If qx is increasing with age, is Type I (dying)
• If qx is decreasing with age, Type III (living)
• If qx is constant, Type II (constant)
• if qx increases (or decreases) in a linear fashion, is Gompertz (or inverse Gompertz)
• if qx increases (or decreases) exponentially, is Hyperbolic (or inverse hyperbolic)
• if qx increases (or decreases) gradually, is Weibull/Logistic (or inverse Weibull/Logistic)
3. dx
dx = lx - l(x+1)
4. qx
qx = dx / lx
5. Lx
Lx = (lx - l(x+1)) / 2
6. Tx
Tx = Sum of all Lx’s
7. ex
• ex = Tx / lx
• But..with Type II: ex = (2 - qx) / (2 * qx)
 Author: rincrocci ID: 288717 Card Set: Biology of Aging Comp Exam.txt Updated: 2014-11-09 22:04:12 Tags: Biology Aging Comp Exam txtBiology Folders: Description: Biology of Aging Comp exam Show Answers: