| calcium {SMPracticals} | R Documentation |
Calcium Uptake Data
Description
These are data on the uptake of calcium by cells suspended in a radioactive solution, as a function of time.
Usage
data(calcium)Format
A data frame with 27 observations on the following 2 variables.
- time
The time (in minutes) that the cells were suspended in the solution
- cal
The amount of calcium uptake (nmoles/mg)
Details
Howard Grimes from the Botany Department, North Carolina State University, conducted an experiment for biochemical analysis of intracellular storage and transport of calcium across plasma membrane. Cells were suspended in a solution of radioactive calcium for a certain length of time and then the amount of radioactive calcium that was absorbed by the cells was measured. The experiment was repeated independently with 9 different times of suspension each replicated 3 times.
Source
Rawlings, J.O. (1988) Applied Regression Analysis. Wadsworth and Brooks/Cole Statistics/Probability Series.
References
Davison, A. C. (2003) Statistical Models. Cambridge University Press. Page 469.
Examples
data(calcium)
summary(nls(cal~beta0*(1-exp(-time/beta1)),data=calcium,start=list(beta0=5,beta1=5)))