A research team in Japan recently successfully developed a sperm freezing drying method. This method can be used to freeze sperm and dry, and sperm can be restored to normal during use.The results of the research were published in the new British reproductive medicine magazine "Human Breeding".
According to the news bulletin issued by the group, in the treatment and rare wildlife protection, liquid nitrogen is usually used to save sperm, but due to the interference of external factors such as power outages, the preserved sperm is damaged.The new method makes preservation sperm more convenient and easy to do, reducing relevant risks.
This research team was led by Professor Hiroko Kojiro of Asahikawa Medical University and Professor Liomo Rako of the University of Hawaii, USA.Researchers immerse human sperm in a special solution of 37 degrees Celsius in the experiment for 10 minutes, then quickly freeze with liquid nitrogen and dry them under vacuum conditions, and then put the sperm that have been treated in such a 4 degrees Celsius for 1 month.EssenceSince then, researchers have taken out dry sperm and put them in water to restore them and observe the chromosomes of sperm. As a result, 80 % to 90 % of sperm are normal, which is no different from sperm in natural state.
In mouse experiments, researchers have used this frozen sperm after drying and returning to the normal state to make the mouse pregnant normally.This confirms that this preservation method retains the normal genetic information.
(Editor in charge: Internship Liu Suqiong)
