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<p>The use of fixatives and stains during the 19th century enabled a quantum change in cytological information gathered by early microscopists. With the development of microtomy for obtaining thin tissue sections and photomicrography, the emerging discipline of histology became essential for all biology and medical students. Realizing that binding of stains with specific cell components reflects chemical affinity, and integrating chemists’ and biochemists’ findings about chemistry of biological molecules, microscopists applied biochemical approaches to localize various classes of molecules <i>in situ</i> in cells and tissues, leading to emergence of cyto- and histochemistry, respectively. Identification of sites of <i>in situ</i> localization of various classes of macromolecules and enzymes in a cell through histo- and cyto-chemical approaches unraveled potential functions of different cell components and organelles. This foundational knowledge, in conjunction with continuing improvements in microscopy and molecular biological techniques, facilitated the development of more powerful and precise molecular cell biological methods like cellular autoradiography, immuno-staining, <i>in situ</i> hybridization, etc., for examination through bright-field, fluorescence, confocal, or electron microscope.</p>

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Tracing the Roots of Molecular Biology

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • Subhash C. Lakhotia

摘要

The use of fixatives and stains during the 19th century enabled a quantum change in cytological information gathered by early microscopists. With the development of microtomy for obtaining thin tissue sections and photomicrography, the emerging discipline of histology became essential for all biology and medical students. Realizing that binding of stains with specific cell components reflects chemical affinity, and integrating chemists’ and biochemists’ findings about chemistry of biological molecules, microscopists applied biochemical approaches to localize various classes of molecules in situ in cells and tissues, leading to emergence of cyto- and histochemistry, respectively. Identification of sites of in situ localization of various classes of macromolecules and enzymes in a cell through histo- and cyto-chemical approaches unraveled potential functions of different cell components and organelles. This foundational knowledge, in conjunction with continuing improvements in microscopy and molecular biological techniques, facilitated the development of more powerful and precise molecular cell biological methods like cellular autoradiography, immuno-staining, in situ hybridization, etc., for examination through bright-field, fluorescence, confocal, or electron microscope.