精子騙了科學家近350年 新研究:精子非 - 成人話題討論

By Belly
at 2020-08-02T06:35
at 2020-08-02T06:35
Table of Contents
精子騙了科學家近350年 新研究:精子非左右擺動前進
57分鐘
340多年來,科學家透過2D顯微鏡下觀察精子,就以為精子是像鰻魚在水中擺尾游泳般,
左右擺動尾巴來前進。布里斯托大學(University of Bristol)有研究人員用先進的3D
高速顯微鏡觀察後,驚覺是「眼睛欺騙了我們」,原來精子是像嬉戲的水獺般,「頭部旋
轉、尾巴則繞著游泳軸滾動」來前進。這項研究成果前天(7日31日)刊登於美國科學期
刊《科學進展》(Science Advances)。
眼睛欺騙了我們。研究人員發現,人類精子運動並非此前的認識。最新的三維高速顯微
鏡下,精子是在滾動中前行的。具體而言,精子頭部旋轉,尾部則繞著游泳軸滾動,如此
實現了前行。 7月31日,這項研究發表在了《科學進展》(Science Advances)。研究者
來自英國布裡斯托大學和墨西哥國立自治大學。
《福斯新聞》報導,1677年荷蘭(尼德蘭)科學家雷文霍克(Antonie van Leeuwenhoek
,顯微鏡之父)某天在做完愛後,用顯微鏡觀察自己的精液,發現了精子,並且描述說,
這些精子在像蛇或鰻魚般遊動。這項發現於1678年發表後,幾個世紀來,科學家用顯微鏡
從上方往下看,也都得到了統一的結論:精子透過左右移動尾巴來前進。
然而,英國布里斯托大學工程數學系教授賈德哈(Hermes Gadelha)的最新研究顯示,我
們已經成為「被精子欺騙」的受害者。賈德哈說,他與墨西哥國立自治大學的研究人員柯
基迪(Gabriel Corkidi)、達斯森(Alberto Darszon),利用載物台可高速上下移動的
3D顯微鏡,觀察精子樣本;並以1秒可記錄逾5.5萬幀的高速相機,紀錄精子自由游動的3D
影像。
結果發現,精子頭部在旋轉,尾部也在旋轉,而兩個旋轉是各自獨立的。精子在頭部旋轉
的同時,擺動尾巴來向前推進;而精子尾巴是單側擺動的,這是一種非對稱的游泳技術,
有點類似地球在自轉的同時繞著太陽公轉一樣。另一個比喻則是旋轉的陀螺,在旋轉中發
生位移。
賈德哈表示,過半的不孕症是因為男性方面出了問題,了解人類精子的尾巴及前進活動的
方式,有助了解它們對自然受孕的影響及辨別不健康的精子。達斯森則相信,這項研究將
改變人們對精子活力和自然受精的理解。(國際中心/綜合外電報導)
https://tw.appledaily.com/international/20200802/BMBX2UERKJCYK6RYC7CYBVOKEA/
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