Compositional interpretations of medfly mortality.

Compositional interpretations of medfly mortality.
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地中海果蝇死亡率的组成解释。

DOI:
10.1126/science.8503016
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发表时间:
1993
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Carey,JR
Carey,JR
中科院分区:
--
文献类型:
--
作者:
Vaupel,JW;Carey,JR

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120万只地中海果蝇的死亡率随着年龄的增长先上升后下降(图1)(1)。如果这种模式反映了个体的年龄变化,那么关于衰老的生物学理论可能需要重新思考(2)。另一方面,年龄轨迹可能是人口结构演变的产物(3)。死亡通过不同地移除脆弱的人来改变队列的组成。有可能的是,任何特定脆弱程度的蜻蜓死亡率的年龄轨迹实际上都会随着年龄的增长而稳步上升。我们用递增的Gompertz(4)或威布尔(5)曲线的混合曲线紧密地拟合了观察到的蝇类死亡模式(1)。设9(X)表示存活到确切年龄x的队列的比例,其中5(0)=1,且队列在w岁时灭绝或不再观察到。假设具有固定脆弱z的个体在x岁时死亡的危险由K(x,z)给出。如果S(x,z)表示脆弱z的个体存活到确切年龄x的比例,则S(x,z)=e-fl 1(Cz)dt0
Death rates for a cohort of 1.2 million Mediterranean fruit flies (Ceratitis capitata) rose and then fell with age (Fig. 1)(1). If this pattern reflects age changes for individuals, biological theories of aging may have to be rethought (2). On the other hand, the age trajectory may be an artifact of the evolving structure of the population (3). Death changes the composition of a cohort by differentially removing the frail. It is possible that the age trajectory of mortality for medflies at any specific degree of frailty actually rises steadily with age. We have closely fitted the observed medfly mortality pattern (1) with mixtures of increasing Gompertz (4) or Weibull (5) curves. Let 9 (x) denote the proportion of a cohort that survives to exact age x, where 5 (0)= 1, and where the cohort is extinct or no longer observed at age w. Assumethat the hazard of death at age x for individuals with fixed frailty z is given by K (x, z). If s (x, z) denotes the proportion of individuals with frailty z who survive to exact age x, then s (x, z)= e-fl 1 (cz) dt 0
具有未观察到的异质性的危险模型的可识别性:两个明显矛盾的结果的兼容性
DOI: --
发表时间: 1990
期刊:
影响因子: --
作者:
J. Hoem
通讯作者: J. Hoem
DOI: 10.1126/science.1411541
发表时间: 1992-10-16
期刊: SCIENCE
影响因子: 56.9
作者:
CURTSINGER, JW;FUKUI, HH;VAUPEL, JW
通讯作者: VAUPEL, JW
DOI: 10.1126/science.1411540
发表时间: 1992-10-16
期刊: SCIENCE
影响因子: 56.9
作者:
CAREY, JR;LIEDO, P;VAUPEL, JW
通讯作者: VAUPEL, JW