冬天到來，各動物均出盡渾身解數迎接大自然給予的挑戰，譬如老生常談的燕子南遷及松鼠冬眠等等。807Please respect copyright.ＰＥＮＡＮＡ1ELT95nngO
807Please respect copyright.ＰＥＮＡＮＡDLrhbpnFcf
807Please respect copyright.ＰＥＮＡＮＡgbIYJZnJXW
（圖2）而今次將要介紹的主角，就是體積非常細小的小臭鼩(Etruscan shrew)。807Please respect copyright.ＰＥＮＡＮＡq65SJKKj7S
807Please respect copyright.ＰＥＮＡＮＡqDbxlkdTOF
807Please respect copyright.ＰＥＮＡＮＡ8HUtNQUcf7
（圖3）冬天期間，小臭鼩(Etruscan shrew)的大腦皮層厚度會相應減少。807Please respect copyright.ＰＥＮＡＮＡKcr20ctf0R
從圖中可見，唯獨是L4區域有所縮細，其他區域並無顯著改變。807Please respect copyright.ＰＥＮＡＮＡGZXEfhYfpe
807Please respect copyright.ＰＥＮＡＮＡ1XnLMigZEd
807Please respect copyright.ＰＥＮＡＮＡQa0jRKvg1F
（圖4）有趣的是，在夏天期間，若果食物供應不足夠的話，小臭鼩(Etruscan shrew)的大腦皮層厚度亦會相應減少。807Please respect copyright.ＰＥＮＡＮＡx4Ni85mdak
但若果食物供應足夠的話，則不會出現「腦細」的情況。807Please respect copyright.ＰＥＮＡＮＡTMqaSCxUor
807Please respect copyright.ＰＥＮＡＮＡQboXzjhZEz
807Please respect copyright.ＰＥＮＡＮＡxwHkuae3PL
（圖5）之所出現「腦細」的其中一個原因，相信是與新陳代謝有關。807Please respect copyright.ＰＥＮＡＮＡjNx7qCu4n3
對比其他區域，L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶，807Please respect copyright.ＰＥＮＡＮＡ9z1N3v2uzN
而CO蛋白酶的功用則為製造能源。807Please respect copyright.ＰＥＮＡＮＡi4GEa7DHui
807Please respect copyright.ＰＥＮＡＮＡmoPpBvIGA2
807Please respect copyright.ＰＥＮＡＮＡFOMWOhikvu
這暗示出可能小臭鼩為了應對冬天食物短缺問題，所以索性盡量棄用與新陳代謝有關的部份，以作節省資源。807Please respect copyright.ＰＥＮＡＮＡTQDPOTCpNQ
807Please respect copyright.ＰＥＮＡＮＡbBmoRi32i2
當然，亦不排除有其他的可能性。807Please respect copyright.ＰＥＮＡＮＡg0BZiZrmKi
807Please respect copyright.ＰＥＮＡＮＡOKRlaT1Y9k
（圖6）圖中為大腦皮層磁力共振得出的影像。807Please respect copyright.ＰＥＮＡＮＡaS9Rqaix87
藍綠色為冬天的時候，而橙黃色則為夏天時候。807Please respect copyright.ＰＥＮＡＮＡ16RDE1LyR8
807Please respect copyright.ＰＥＮＡＮＡaNWjneLHVw
807Please respect copyright.ＰＥＮＡＮＡbfET0Sx9qQ
冬天和夏天的影像互相重疊後，橙黃色的區域較多，顯示夏天的腦部體積較冬天的為大。807Please respect copyright.ＰＥＮＡＮＡAdYDIATsCp
807Please respect copyright.ＰＥＮＡＮＡkqT1RLxYHL
平均來說，小臭鼩在冬天時候的大腦皮層厚度會縮減28%左右，但在下一年夏天的時候則會完全恢復回原有的厚度。807Please respect copyright.ＰＥＮＡＮＡTjBVPsSvd7
807Please respect copyright.ＰＥＮＡＮＡT9TLPt13WY
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。807Please respect copyright.ＰＥＮＡＮＡrbWMG35UcL
807Please respect copyright.ＰＥＮＡＮＡm1QnskyyEA
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/toc807Please respect copyright.ＰＥＮＡＮＡhqLzOk1CXj
807Please respect copyright.ＰＥＮＡＮＡqwk9TlCecR
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。807Please respect copyright.ＰＥＮＡＮＡjLrLYeU6Ed
807Please respect copyright.ＰＥＮＡＮＡqJg1Mfw4Mq
Link:807Please respect copyright.ＰＥＮＡＮＡgxgp8YqPf1
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio807Please respect copyright.ＰＥＮＡＮＡRUJjNmgumh
807Please respect copyright.ＰＥＮＡＮＡpcOLRhcZV1
有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。807Please respect copyright.ＰＥＮＡＮＡPEzTTj3LLm
807Please respect copyright.ＰＥＮＡＮＡ6HiC2TSXd2
https://www.instagram.com/potatopigtongue/807Please respect copyright.ＰＥＮＡＮＡ5fYeRrWLPG
807Please respect copyright.ＰＥＮＡＮＡBqwKxHbYMJ
Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117807Please respect copyright.ＰＥＮＡＮＡf64yqEXT9I
Penana
search
登入arrow_drop_down
註冊arrow_drop_down
