Catfish skin resulting from failure of critical point drying and displaying slight shrikage and widening of cell junctions. Basidiospores showing some collapse following critical point drying. It is then removed from the HMDS and air-dried. In some specimens, it does not work at all. As a result, the tissue is embedded in a hardened polymer.
Biological specimens are by their own nature poor signal emitters.
A sensory structure on an ichpneumonid wasp. Brightness in the setae is due to inhanced emission rather than charging. Mechanically deposited thin films - includes those deposited by thermal evaporation and plasma discharge. The earliest method employed. Still has some application.