1. Rapid freezing versus slow programmable freezing of human spermatozoa
Teraporn Vutyavanich, M.D., Waraporn Piromlertamorn, M.Sc., Siriporn Nunta, B.Sc. 
Fertility and Sterility 
Volume 93, Issue 6, Pages (April 2010)
DOI: /j.fertnstert
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
(A) A solid aluminum block immersed in liquid nitrogen. (B) A straw was inserted into a hole in the precooled aluminum block.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions

3. Figure 2
Changes in temperature inside a straw, which had been inserted into a hole inside a precooled aluminum block that was previously immersed in liquid nitrogen.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions