The thawing rate effect is particularly pronounced when the
freezing was done quickly, it could explain the greater of yeast
viability in quickly frozen dough (40 C and liquid nitrogen).
Mazur and Schmidt (1968) indicated that the small ice crystals
formed by rapid freezing in the yeast cells, and if thawing is done
slowly (this study) they would have time to grow according to the
recrystallization process.