科普專欄–薯不揀單 - 深入淺出–大麥的重金屬鎘含量(Cadmium)

過度開採環境，最終受害的只會是人類自己。836Please respect copyright.ＰＥＮＡＮＡ8Z3UsJbEKA
836Please respect copyright.ＰＥＮＡＮＡyvuB5h3may
（圖1）19世紀，日本三井金屬礦業的神岡礦山過度開採，排出的重金屬累積在泥土裡頭，導致河旁的稻田穀物受到鎘(Cadmium)重金屬污染。836Please respect copyright.ＰＥＮＡＮＡatTM5Ihk31
836Please respect copyright.ＰＥＮＡＮＡ7BSE6A3M9W
836Please respect copyright.ＰＥＮＡＮＡaxMjbwczV4
不知情的居民長期服用鎘污染的稻米，骨骼逐漸變得鬆脆，腎臟亦受到嚴重傷害。836Please respect copyright.ＰＥＮＡＮＡe3474xG7rS
最終日本醫生成功證實得到病因來自攝取過量的重金屬鎘，並把患者經常呻痛的病徵命名為痛痛病(‎Itai-itai disease)。836Please respect copyright.ＰＥＮＡＮＡp3TGa0mpTt
836Please respect copyright.ＰＥＮＡＮＡqtiA8wrcVh
而稻米的鎘含度自此受到重視，世衛WHO更將大麥的鎘上限設為0.1mg kg−1，亦即是每一公斤大麥只可有一微克鎘。836Please respect copyright.ＰＥＮＡＮＡYYxk6rqK6S
836Please respect copyright.ＰＥＮＡＮＡdNduIz26on
836Please respect copyright.ＰＥＮＡＮＡSEMlGd1Bd7
（圖2）一直以來，科學家已找出不少穀物吸取或代謝重金屬的基因，把穀物改造，盡量減低重金屬累積在穀物的程度。836Please respect copyright.ＰＥＮＡＮＡ2ccx33wMQg
836Please respect copyright.ＰＥＮＡＮＡRoKEG4V1be
836Please respect copyright.ＰＥＮＡＮＡvnimeFexZd
近日有科學家比較世界100款大麥的鎘數量(Ref1)，發現日本一款Haruna Nijo大麥的鎘含量最高(0.04mg kg−1），而阿富汗BCS318大麥款式則為最低(0.01mg kg−1）。836Please respect copyright.ＰＥＮＡＮＡDwXl5xQLCg
836Please respect copyright.ＰＥＮＡＮＡ4RqkKjtGwb
（圖3）一輪比較過後，科學家證實阿富汗大麥的HvHMA3蛋白質數量比較多，為大麥減少吸收泥土鎘金屬的主因。836Please respect copyright.ＰＥＮＡＮＡ4vRf7yGvfN
836Please respect copyright.ＰＥＮＡＮＡY6YZIbb7T2
836Please respect copyright.ＰＥＮＡＮＡq429Xnx3bU
最後證實，歸根原因是一段特定的基因安插在HvHMA3蛋白質基因的前頭，催促HvHMA3蛋白質的產生。836Please respect copyright.ＰＥＮＡＮＡrm5JqTFccx
836Please respect copyright.ＰＥＮＡＮＡkQ6JBI4hgI
科學家後來再找尋另外334款大麥，發覺有54種同樣被安插在同樣位置，而那54款品種又的確是含有較少的鎘金屬數量。836Please respect copyright.ＰＥＮＡＮＡDgxSeXkBmw
836Please respect copyright.ＰＥＮＡＮＡUqbClRozXu
836Please respect copyright.ＰＥＮＡＮＡhWZY1d17ff
最後，科學家把那段基因插在日本Haruna Nijo大麥的適當位置上，同樣亦能將鎘金屬數量減至與阿富汗品種相同，而產量及其他各種礦物質的含量並沒有任何的大改變。836Please respect copyright.ＰＥＮＡＮＡt2Rgucod9k
836Please respect copyright.ＰＥＮＡＮＡXaU22FN2hy
此基因的排序及位置已公開在資料庫上，好讓各種基因學家或相關人士可作參考盡量減低日後穀物的鎘金屬數量。836Please respect copyright.ＰＥＮＡＮＡrkuhudp1cL
836Please respect copyright.ＰＥＮＡＮＡPJwZWJMUof
836Please respect copyright.ＰＥＮＡＮＡvYLy77MXwW
836Please respect copyright.ＰＥＮＡＮＡ1UjA149VAR
如果想我快啲出文的話，請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark，這對我非常之重要。836Please respect copyright.ＰＥＮＡＮＡK4ZqCM8Wlo
836Please respect copyright.ＰＥＮＡＮＡowN6qMYCbJ
Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc836Please respect copyright.ＰＥＮＡＮＡcZ7O9vXot5
836Please respect copyright.ＰＥＮＡＮＡP2wy5T4Cde
同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」，以課金的方式推動我繼續搜羅資料寫文，多謝。836Please respect copyright.ＰＥＮＡＮＡcF6b82wRBk
836Please respect copyright.ＰＥＮＡＮＡzDJ8X3h5g5
Link:836Please respect copyright.ＰＥＮＡＮＡxOTaYa369v
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio836Please respect copyright.ＰＥＮＡＮＡu9jaknSfSO
836Please respect copyright.ＰＥＮＡＮＡzpBsgLhYaq
836Please respect copyright.ＰＥＮＡＮＡ01FAjqiPKW
有興趣接收科普資訊的話，歡迎follow IG: potatopigtongue。836Please respect copyright.ＰＥＮＡＮＡ1NMB4Fbsbv
836Please respect copyright.ＰＥＮＡＮＡAz964XgG5O
Ref1:https://www.nature.com/articles/s43016-020-0130-x836Please respect copyright.ＰＥＮＡＮＡJW7AIk8CeI

ns3.128.24.183da2

介面主題:

字體大小:

行距:

段距:

自動加載下一章