= Tim R. Mosmann
{c}
{tag=Biology author}
= T. Mosmann
{c}
{synonym}
\b[Tim R. Mosmann] is an immunology researcher whose work includes quantitative cellular assays and analysis of <T cell> responses. His Rochester laboratory identifies him by this name and directly lists the 1983 colorimetric-assay paper published as T. Mosmann. This provides an institutional link between the initial-only byline and the named researcher; the R. is retained without expansion.<Tim R. Mosmann laboratory profile at Rochester>[Lab Members, Principal Investigator; laboratory homepage, Selected Publications, PMID 6606682]{ref}
In 1983, <Tim R. Mosmann> reported a <tetrazolium salt>-based colorimetric method for mammalian cell survival, <cell proliferation> and activation. The paper's abstract describes a multiwell scanning <spectrophotometer> readout and explicitly notes that signal depends on activation. The experimental contribution therefore includes both a convenient quantitative assay and a qualification on its biological interpretation.<Rapid colorimetric assay for cellular growth and survival: application to proliferation and cytotoxicity assays by T. Mosmann>[Abstract and exact published byline]{ref}
An original <measurement model> illustrates that qualification. Suppose a background-corrected signal is $S=kNm$, where $N$ is the number of contributing cells, $m$ their mean per-cell reducing activity under the assay conditions and $k$ an instrumental factor. Doubling $N$ at unchanged $m$ doubles the signal, but doubling $m$ at unchanged $N$ does too. The single scalar signal does not identify both quantities.
For stipulated initial $N=100$ and $m=1$, the products $Nm$ for later populations $(N,m)=(200,1)$ and $(100,2)$ are both 200. A larger readout alone cannot distinguish proliferation from increased activity per cell. Conversely, halving cell number while doubling mean activity can leave the total unchanged. These are model examples, not data from the 1983 paper.
Controls with known cell numbers, appropriate blanks and independent biological observations help establish which interpretation applies. The general lesson is to connect <cell viability> and <cell proliferation> claims to a validated response model, rather than assigning every absorbance change to one mechanism.
The laboratory also describes computational analysis of high-dimensional <flow cytometry> measurements of <T cells>.<Tim R. Mosmann laboratory profile at Rochester>[laboratory homepage, Batch effects in flow cytometry data]{ref} That scientific setting likewise requires distinguishing a measured signal pattern from the underlying populations it is intended to represent.
\Image[https://www.urmc.rochester.edu/neuroscience/_shared/img/faculty/TimMosmann.jpg]
{title=<Tim R. Mosmann>, portrait explicitly named on the Rochester Mosmann laboratory members page}
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