title: Low-temperature preparation techniques for electron microscopy of biological specimens based on rapid freezing with liquid helium II.
mesh_terms: D003080:Cold Temperature; D004583:Electrons; D005615:Freezing; D006371:Helium; D006652:Histological Techniques; D008853:Microscopy; D008854:Microscopy, Electron; D013696:Temperature
chemical_list: D006371:Helium
keywords: HISTOLOGICAL TECHNIQUES; MICROSCOPY, ELECTRON