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+\name{SFO}
+\Rdversion{1.1}
+\alias{SFO}
+\title{ Single First-Order kinetics }
+\description{
+  Function describing exponential decline from a defined starting value.
+}
+\usage{
+  SFO(t, parent.0, k)
+}
+\arguments{
+  \item{t}{ Time. }
+  \item{parent.0}{ Starting value for the response variable at time zero. }
+  \item{k}{ Kinetic constant. }
+}
+\value{
+  The value of the response variable at time \code{t}.
+}
+\references{ 
+  FOCUS (2006) \dQuote{Guidance Document on Estimating Persistence and
+  Degradation Kinetics from Environmental Fate Studies on Pesticides in EU
+  Registration} Report of the FOCUS Work Group on Degradation Kinetics,
+  EC Document Reference Sanco/10058/2005 version 2.0, 434 pp,
+  \url{http://focus.jrc.ec.europa.eu/dk} 
+}
+\author{ Johannes Ranke }
+\examples{
+  \dontrun{plot(function(x) SFO(x, 100, 3), 0, 2)}
+}
+\keyword{ manip }