Summary
Reflection contrast microscopy (RCM) has proven to be a useful tool for the study of living cells (Ploem 1975). Due to the effective suppression of aspecific reflected light by polarization optics combined with a quarter lambda plate at the front lens of the objective, low intensity reflection signals originating from minor amounts of precipitated diaminobenzidine (DABox) in immunocytochemically stained specimens, can be made visible. RCM has been successfully applied in demonstrating single copy nucleic acid sequences using in situ hybridization procedures (Landegent et al. 1984).
We have systematically studied the aspects of image formation of DABox by RCM by using a model system consisting of glass slides coated with peroxidase containing protein layers to determine the conditions for optimal sensitivity of this detection method. Moreover, investigations were performed to study the relationship between the amount of reflected light and DABox depending on the thickness of the object. Both theoretical and practical evidence is obtained to show that DABox detection by RCM is based on interference phenomena occurring in the layer of DABox, and less on selective reflection. This restricts the type of specimen which can be used for sensitive detection of DABox by RCM. Consequently, in ultrathin (40 nm) sections osmificated DABox was visualized in peroxidatic positive cell organelles with high contrast and resolution. Similar results were obtained with immunoperoxidase stained material embedded in Lowicryl under conditions that did not allow visualization of the staining product by bright field microscopy.
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Velde, I.Ct., Bonnet, J., Tanke, H.J. et al. Reflection contrast microscopy. Histochemistry 89, 141–150 (1988). https://doi.org/10.1007/BF00489917
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DOI: https://doi.org/10.1007/BF00489917