Abstract
The main purpose of in vivo cryotechnique (IVCT) is to make all biological components of cells and tissues of functioning organs promptly frozen in living animals. However, the necessary freezing times are always different at each depth from the frozen tissue surface, because thermal conductance of cooling within cells and tissues is due to the continuous movement of thermal energy. Therefore, only surface tissue layers within certain depths, such as about 10 or 200 μm, are frozen enough to prevent formation of visible ice crystals at electron or light microscopic levels, respectively. With the metal contact freezing method, they are slightly compressed on the cooled copper metal due to crash impact, even though some spacers and cushions are always inserted between specimens and the cooled metal block. To the contrary, with liquid cryogen, such as the isopentane-propane mixture precooled in liquid nitrogen, the frozen tissues can retain their original morphological states without mechanical compression damages. To examine deeper tissue areas from the frozen tissue surface, we always need to cryocut any functioning organs of living animals under anesthesia. When a cryoknife precooled in liquid nitrogen passes through the living animal organ, the exposed tissue surface in direct contact with the cryoknife is first frozen in the same way as the metal contact method. Practically, at an electron microscopic level, well-frozen tissue areas appear to occupy a very narrow band, less than 10 μm deep from the contact tissue surface.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Ohno S, Terada N, Fujii Y, Ueda H, Takayama I (1996) Dynamic structure of glomerular capillary loop as revealed by an in vivo cryotechnique. Virchows Arch 427:519–527
Ohno S, Baba T, Terada N, Fujii Y, Ueda H (1996) Cell biology of kidney glomerulus. Int Rev Cytol 166:181–230
van Harreveld A, Trubatch J (1975) Synaptic changes in frog brain after stimulation with potassium chloride. J Neurocytol 4:33–46
Jehl B, Bauer R, Dorge A, Rick R (1981) The use of propane/isopentane mixtures for rapid freezing of biological specimens. J Microsc 123:307–309
Cole R, Matuszek G, See C, Rieder CL (1990) A simple pneumatic device for plunge-freezing cells grown on electron microscopy grids. J Electron Microsc Tech 16:167–173
Terada N, Fujii Y, Kato Y, Ueda H, Baba T, Ohno S (1998) Scanning electron microscopic study of erythrocyte shapes artificially jetted through tubes at different pressures by ‘in vitro cryotechnique for erythrocytes’. J Electron Microsc 47:489–493
Terada N, Ohno S (1998) Dynamic morphology of erythrocytes revealed by cryofixation technique. Acta Anat Nippon 73:587–593
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2016 Springer Japan
About this chapter
Cite this chapter
Ohno, S. (2016). Technical Merits with “IVCT”. In: Ohno, S., Ohno, N., Terada, N. (eds) In Vivo Cryotechnique in Biomedical Research and Application for Bioimaging of Living Animal Organs. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55723-4_4
Download citation
DOI: https://doi.org/10.1007/978-4-431-55723-4_4
Publisher Name: Springer, Tokyo
Print ISBN: 978-4-431-55722-7
Online ISBN: 978-4-431-55723-4
eBook Packages: MedicineMedicine (R0)