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。620Please respect copyright.PENANArfeWGVEyu0620Please respect copyright.PENANATl2YMpIPvp
620Please respect copyright.PENANAHdEvnTr6eF
(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)。620Please respect copyright.PENANAQe71Y4rfZx620Please respect copyright.PENANAfZE68NnkUz
620Please respect copyright.PENANA943RG4ZpqI
(圖3)冬天期間,小臭鼩(Etruscan shrew)的大腦皮層厚度會相應減少。620Please respect copyright.PENANAw7nROJQEq9
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。620Please respect copyright.PENANA3aJpheM8f3620Please respect copyright.PENANAhSoNn9yofi
620Please respect copyright.PENANAR92M56WO2Z
(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。620Please respect copyright.PENANAXtNA9SMDAI
但若果食物供應足夠的話,則不會出現「腦細」的情況。620Please respect copyright.PENANAisCR43cjRd620Please respect copyright.PENANAbOtX8bWh8B
620Please respect copyright.PENANAgUFktQqANo
(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。620Please respect copyright.PENANAa8J4CxMdJL
對比其他區域,L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶,620Please respect copyright.PENANAgeLbt7djio
而CO蛋白酶的功用則為製造能源。620Please respect copyright.PENANALAOdaBzwPO620Please respect copyright.PENANA91cFbTJe2T
620Please respect copyright.PENANAFWILHaGPEa
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。620Please respect copyright.PENANAzfH1ciyDoY
620Please respect copyright.PENANAkqX5aozDM5
當然,亦不排除有其他的可能性。620Please respect copyright.PENANA5CoFGTCpfR
620Please respect copyright.PENANAG5IVxt5L77
(圖6)圖中為大腦皮層磁力共振得出的影像。620Please respect copyright.PENANAFdMeIHg9iB
藍綠色為冬天的時候,而橙黃色則為夏天時候。620Please respect copyright.PENANA3R8Cfrg0GN620Please respect copyright.PENANA5E4brpCmZ0
620Please respect copyright.PENANA06H9CXyns2
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。620Please respect copyright.PENANABieXOs8gZp
620Please respect copyright.PENANALp7mnPaEmY
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。620Please respect copyright.PENANAalvLgmKQXQ
620Please respect copyright.PENANAnA0FkxbKOZ
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。620Please respect copyright.PENANAWsPeD44AiE
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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/toc620Please respect copyright.PENANA9RZu5JIQFx
620Please respect copyright.PENANAzSve9QHeRf
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。620Please respect copyright.PENANAqSd3W110ho
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Link:620Please respect copyright.PENANAPI6SGhWusB
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio620Please respect copyright.PENANA87hHobfYmu
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有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。620Please respect copyright.PENANAqlP0JSmzKi
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https://www.instagram.com/potatopigtongue/620Please respect copyright.PENANAIln4z83YBc
620Please respect copyright.PENANAvINbWGSUjc
Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117620Please respect copyright.PENANAHMDqjyMsqU
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深入淺出–動物過冬的一道奇謀
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