= W. P. Meeuwsen-van der Roest
{c}
\b[W. P. Meeuwsen-van der Roest] coauthored a 1991 experimental study with <W. G. Zijlstra> and <A. Buursma> measuring the <molar absorption coefficient> of four derivatives of <fetal hemoglobin> and adult <hemoglobin> across 450–1000 nm. The work supplied spectral reference measurements relevant to separating <oxyhemoglobin>, <deoxyhemoglobin>, <carboxyhemoglobin> and <methemoglobin> by optical analysis.<Absorption spectra of human fetal and adult oxyhemoglobin, de-oxyhemoglobin, carboxyhemoglobin, and methemoglobin by W. G. Zijlstra and others>[Byline; Abstract, first two sentences]{ref}
The scientific point is that similar-looking spectra need not be interchangeable reference data. In <co-oximetry>, a model based on the <Beer-Lambert law> combines reference spectra to infer component concentrations. A small reference mismatch can alter the inferred mixture even when the measured <absorbance> is precise.
An original two-component example explains the sensitivity. Suppose two synthetic readings satisfy
$$
a_1=c_1+c_2,\qquad a_2=c_1+(1+\epsilon)c_2.
$$
Then $c_2=(a_2-a_1)/\epsilon$. If $\epsilon=0.01$, an error of $0.001$ in $a_2-a_1$ changes the inferred $c_2$ by $0.1$ in the model's concentration units. Near-similarity of reference columns can therefore amplify small errors. These invented coefficients illustrate the inverse problem; they are not the paper's measured <hemoglobin> spectra.
The documented contribution is to the joint experimental reference study. Its byline establishes coauthorship, while the spectra and their use in mixture analysis explain why the work matters beyond a list of publications.
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