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。877Please respect copyright.ＰＥＮＡＮＡ90kT68grcU
877Please respect copyright.ＰＥＮＡＮＡwLJTWQU0EX
877Please respect copyright.ＰＥＮＡＮＡ5NUveQvJAr
（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)。877Please respect copyright.ＰＥＮＡＮＡCkesG3ZX5C
877Please respect copyright.ＰＥＮＡＮＡZPu0e2z9Jc
877Please respect copyright.ＰＥＮＡＮＡjv7Nrcz3HH
（圖3）冬天期間，小臭鼩(Etruscan shrew)的大腦皮層厚度會相應減少。877Please respect copyright.ＰＥＮＡＮＡftzA8WeBLH
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。877Please respect copyright.ＰＥＮＡＮＡGoLor2gduc
877Please respect copyright.ＰＥＮＡＮＡL7FVpzF9TR
877Please respect copyright.ＰＥＮＡＮＡR0KjDvCqJE
（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。877Please respect copyright.ＰＥＮＡＮＡsfWqPjCPQj
但若果食物供應足夠的話，則不會出現「腦細」的情況。877Please respect copyright.ＰＥＮＡＮＡH05bzbTwTo
877Please respect copyright.ＰＥＮＡＮＡXGpWNbson6
877Please respect copyright.ＰＥＮＡＮＡ0s97Q6bJKx
（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。877Please respect copyright.ＰＥＮＡＮＡO2tina57cY
對比其他區域，L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶，877Please respect copyright.ＰＥＮＡＮＡuFBZ06eLjI
而CO蛋白酶的功用則為製造能源。877Please respect copyright.ＰＥＮＡＮＡ3UjPhdg8x5
877Please respect copyright.ＰＥＮＡＮＡzoQd7STDSK
877Please respect copyright.ＰＥＮＡＮＡr8JhM7XNqA
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。877Please respect copyright.ＰＥＮＡＮＡlXXfUovCG7
877Please respect copyright.ＰＥＮＡＮＡBKcM7Z9GB1
當然，亦不排除有其他的可能性。877Please respect copyright.ＰＥＮＡＮＡJkuVjxUChG
877Please respect copyright.ＰＥＮＡＮＡ3CZEGxoskh
（圖6）圖中為大腦皮層磁力共振得出的影像。877Please respect copyright.ＰＥＮＡＮＡl9SEhWssGa
藍綠色為冬天的時候，而橙黃色則為夏天時候。877Please respect copyright.ＰＥＮＡＮＡmN8BbBqubC
877Please respect copyright.ＰＥＮＡＮＡotSsajFia6
877Please respect copyright.ＰＥＮＡＮＡZKO80PG8le
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。877Please respect copyright.ＰＥＮＡＮＡ5AvtwbM3uL
877Please respect copyright.ＰＥＮＡＮＡh5js7JY8b8
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。877Please respect copyright.ＰＥＮＡＮＡ0LmWLNXVBD
877Please respect copyright.ＰＥＮＡＮＡH2UOybipTy
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。877Please respect copyright.ＰＥＮＡＮＡVqtMSNkaX7
877Please respect copyright.ＰＥＮＡＮＡjPdnsrNXi6
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/toc877Please respect copyright.ＰＥＮＡＮＡkT1n8VO8xq
877Please respect copyright.ＰＥＮＡＮＡZQCzAYOsrN
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。877Please respect copyright.ＰＥＮＡＮＡGkelSV2CCN
877Please respect copyright.ＰＥＮＡＮＡyESNYSFqOV
Link:877Please respect copyright.ＰＥＮＡＮＡap0X8S6zbu
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio877Please respect copyright.ＰＥＮＡＮＡxCelXcaWnl
877Please respect copyright.ＰＥＮＡＮＡnaeQzcz5SZ
有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。877Please respect copyright.ＰＥＮＡＮＡIDPNFzNZOc
877Please respect copyright.ＰＥＮＡＮＡMhq3RXCBvk
https://www.instagram.com/potatopigtongue/877Please respect copyright.ＰＥＮＡＮＡYrP5iODdKY
877Please respect copyright.ＰＥＮＡＮＡOpHdzfdbVA
Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117877Please respect copyright.ＰＥＮＡＮＡwDjcgZ5NQk
Penana
search
登入arrow_drop_down
註冊arrow_drop_down
