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Fertility is a natural process to insure the survival of human species.
Through natural selection, we produce many offspring when the
reproductive system works at it's peak in the suitable environment with
plenty of food around. On the other hand, the reproductive system may
completely shut down or work at it's minimum state in reproduction of
offspring, when the environment is hostile including less foods around,
war, epidemic, but regardless of all these factors, most women are
capable of conceiving during their menstrual stages before menopause.
fertility, cryopreservation is technique or process where sperm, embryo
or unfertilized eggs are frozen and preserved in a liquid nitrogen at
very low temperature between 77 K or −196 °C
2. What is cryopreservation?
a) Freezing sperm
sperm are withdrawn from the testicle,it is stored in the tube and
stored in -80ºC for at least 24 hours. Once completely frozen, the
tubes containing sperm is transferred into a regular tube rack for long
It is possible to freeze and
store embryos in liquid nitrogen at very low temperature. Frozen embryos
are stored in embryos bank and only available for legally married
couple. The cost of storing embryos are low compare to other treatments
and 50% of embryos survive thawing and can be transferred into a woman
uterus whenever are needed.
c) Freezing eggs
The technique of
egg freezing is still in experience stage because freezing and thawing
the eggs may damage the outer layer of the eggs and no body know how
long they can be stored for a viable pregnancy.
Some of frozen sperm, embryo and unfertilized eggs may be damaged and can not be used when needed
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