Abstract
Abstract Colloidal gold has been used for centuries in the preparation of stained glass for windows and fine glassware. In recent years, colloidal gold particles have become a useful tool in microscopy for staining tissues and sections. Colloidal gold particles are especially useful for biological electron microscopy, Some of the reasons why are listed below. * Homogeneous preparations of particles varying in size from 3μm to 20μm can be easily prepared. * Colloidal gold suspensions are inexpensive to prepare. Most proteins can be easily coupled to colloidal gold particles. * Most proteins can be easily coupled to colloidal gold particles. * Proteins coupled to gold particles do not appear to lose their biological activity. * The colloidal gold particles can be easily seen in the electron microscope. * Colloidal gold does not naturally occur in biological material. Therefore, if you see it, it is because you put it there. * Colloidal gold probes can be used for light microscopy, The larger gold particles can be directly observed by the light microscope. Small particles are detected by silver enhancement or epipolarized illumination. * The same probes can be used for both LM and TEM imrnunocytochemistry.
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