IDPmisc (version 1.1.20)

MS: Spectrum Measured by a SELDI TOF Mass Spectrometer

Description

The spectrum was taken from a sample of sheep blood. The instrument used was a so called SELDI TOF (Surface Enhanced Laser Desorption Ionisation, Time Of Flight) Mass Spectrometer.

Usage

data(MS)

Arguments

Format

A data frame with 45213 observations on the following 2 variables.

mz

mass / charge

I

Intensity

Details

The measured masses lie between m/z=1000 and 200000. The intensities are raw output. Neither smoothing nor background subtraction was applied to the spectrum.

Examples

Run this code
data(MS)

MS1 <- log10(MS[MS$mz>12000&MS$mz<1e5,])
P <- peaks(MS1, minPH=0.025, minPW=0.0015)

plot(MS1, ty="l", xlim=c(4.15,5))
points(P,col="red")

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