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Figure 25.2. (A) The hazard or force of mortality curves of the normal-lived Ra strain and of two long-lived strains (La and 2La) sequentially derived from it by a direct selection for delayed female fecundity. Each mortality curve is based on the age-specific values obtained from two or three replicate cohorts consisting of at least 250 mixed sex individuals each and was calculated using the Kaplan-Meier survival procedure in SPSS v.7. See Figure 25.1Afor statistical significance. (B) The hazard or force of mortality curves of the normal-lived Ra strain and the PQR strain selected from it by direct selection for paraquat resistance. Each mortality curve is based on the age-specific values obtained from mixed sex cohorts of 250-450 animals each and was calculated using the Kaplan-Meier survival procedure in SPSS v.7. See Figure 25.1B for statistical significance. (C) The hazard or force of mortality curves of the normal-lived Ra control strain and the longer-lived Ra heat-treated strain. The animals were subjected to a nonlethal heat shock (37°C for 90 minutes) early in life at days 5-7 after eclosion. They were then maintained under controlled optimal conditions, and their survival was monitored. The mortality curve was calculated using the Kaplan-Meier survival procedure in SPSS v.7. See Figure 25.1C for statistical significance. (After Arking et al., 2002)

Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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