= Heinz Horstmann
{c}
<Heinz Horstmann> is a researcher credited with the experimental development of <serial block-face scanning electron microscopy>. His 2004 paper with <Winfried Denk> describes repeatedly cutting a resin-embedded sample and imaging the newly exposed surface inside a <scanning electron microscope>. Its contribution statement credits both authors with performing experiments and supplying materials or analysis tools.<Serial Block-Face Scanning Electron Microscopy to Reconstruct Three-Dimensional Tissue Nanostructure by Winfried Denk and Heinz Horstmann>[Abstract; Author Contributions]{ref}
The apparatus addresses a practical reconstruction problem. Collecting separate thin sections can introduce handling and alignment difficulties; imaging the remaining block face after each cut retains a more directly ordered sequence of surfaces. A moving knife and a controlled specimen advance turn sectioning and imaging into repeated steps within the instrument.<Serial Block-Face Scanning Electron Microscopy to Reconstruct Three-Dimensional Tissue Nanostructure by Winfried Denk and Heinz Horstmann>[Introduction; Materials and Methods, Microtome]{ref}
The specimen advance used a <lever> to reduce the displacement of a <motorized micrometer> by a ratio of $0.11$. Applied to the quoted $50\,\mathrm{nm}$ actuator-position uncertainty, this gives $0.11\times50=5.5\,\mathrm{nm}$ at the reduced-motion side. This is the scaled contribution of that actuator uncertainty, not a measurement of the total uncertainty in every removed section.<Serial Block-Face Scanning Electron Microscopy to Reconstruct Three-Dimensional Tissue Nanostructure by Winfried Denk and Heinz Horstmann>[Materials and Methods, Microtome, motion reduction and position uncertainty]{ref}
A separate constructed sampling example highlights an interpretation limit. Two hundred nominal $50\,\mathrm{nm}$ layers cover $10\,\mu\mathrm m$ in depth. If the lateral pixels are $5\,\mathrm{nm}$ wide, depth sampling is ten times coarser. Interpolating the image stack onto smaller depth steps can make a display smoother but does not supply observations of the missing intermediate planes. Horstmann and Denk's work therefore connects instrument mechanics with the geometry and limits of a three-dimensional biological reconstruction.
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