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。830Please respect copyright.PENANAng3wzAYy9Q830Please respect copyright.PENANAhGMwM12FVa
830Please respect copyright.PENANA6vZ3pufyBL
(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)。830Please respect copyright.PENANAAvvNBP8pDu830Please respect copyright.PENANA5d1pmN83YF
830Please respect copyright.PENANA0UMCN1CLlu
(圖3)冬天期間,小臭鼩(Etruscan shrew)的大腦皮層厚度會相應減少。830Please respect copyright.PENANAVHKLl2XPEs
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。830Please respect copyright.PENANAmlRR8gZgx0830Please respect copyright.PENANAjQ3CBX8zjc
830Please respect copyright.PENANANXexuYfaDy
(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。830Please respect copyright.PENANASeZKpJFDY2
但若果食物供應足夠的話,則不會出現「腦細」的情況。830Please respect copyright.PENANABeXISEa8Bc830Please respect copyright.PENANAxIdMMe9slG
830Please respect copyright.PENANAXZhJayzIDK
(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。830Please respect copyright.PENANArKu5My0WmE
對比其他區域,L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶,830Please respect copyright.PENANAKdM2j9wzbf
而CO蛋白酶的功用則為製造能源。830Please respect copyright.PENANAhExmTK9sFO830Please respect copyright.PENANAUwmMmbcjsy
830Please respect copyright.PENANAHUMiXqChF1
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。830Please respect copyright.PENANAtrRwH0PyKf
830Please respect copyright.PENANAwir1Lq6JtQ
當然,亦不排除有其他的可能性。830Please respect copyright.PENANAfd47fpeTcI
830Please respect copyright.PENANAwbnMc2jpdL
(圖6)圖中為大腦皮層磁力共振得出的影像。830Please respect copyright.PENANAdtqziiw1KY
藍綠色為冬天的時候,而橙黃色則為夏天時候。830Please respect copyright.PENANAxun2jcRFYp830Please respect copyright.PENANAtSWnVxbqtF
830Please respect copyright.PENANArRUUXlXn3r
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。830Please respect copyright.PENANAZqJ7ZflaIM
830Please respect copyright.PENANArlBimwEYvj
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。830Please respect copyright.PENANA6q1TcoESxR
830Please respect copyright.PENANAMfi1P1Kwis
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。830Please respect copyright.PENANAXt72PP9vzW
830Please respect copyright.PENANAd9OcuU7ykL
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/toc830Please respect copyright.PENANAZP0x6UAj4e
830Please respect copyright.PENANAFqEUuzFvUK
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。830Please respect copyright.PENANAJAP2PbHeUD
830Please respect copyright.PENANATylO4b2qBO
Link:830Please respect copyright.PENANABqcqkmroLT
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio830Please respect copyright.PENANAQ60n9hAkLq
830Please respect copyright.PENANAIycsPgBAd8
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。830Please respect copyright.PENANAAEoB6uW7q6
830Please respect copyright.PENANAng50So8tyq
https://www.instagram.com/potatopigtongue/830Please respect copyright.PENANAPszmK0obLo
830Please respect copyright.PENANAjHS5W5nR6B
Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117830Please respect copyright.PENANAf9rxdxGHWZ
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科普專欄–薯不揀單
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薯仔聞茱莉

篇 #117
深入淺出–動物過冬的一道奇謀
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