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。601Please respect copyright.PENANAnl4eGQQ2Pl
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(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)。601Please respect copyright.PENANA8RmdrTf9ha
601Please respect copyright.PENANAJ3zpLPd7Sf
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(圖3)冬天期間,小臭鼩(Etruscan shrew)的大腦皮層厚度會相應減少。601Please respect copyright.PENANAekuVD8ooeK
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。601Please respect copyright.PENANAVqc0QWZ6AI
601Please respect copyright.PENANAwp7VafVUud
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(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。601Please respect copyright.PENANAWt11kELHfX
但若果食物供應足夠的話,則不會出現「腦細」的情況。601Please respect copyright.PENANAFKzkYDljTx
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(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。601Please respect copyright.PENANABMSGu21Fdj
對比其他區域,L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶,601Please respect copyright.PENANA4gj1sdH5Nv
而CO蛋白酶的功用則為製造能源。601Please respect copyright.PENANAjn1MTqaHp8
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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。601Please respect copyright.PENANAFxONbhVJaW
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當然,亦不排除有其他的可能性。601Please respect copyright.PENANABx8ixCeO2K
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(圖6)圖中為大腦皮層磁力共振得出的影像。601Please respect copyright.PENANALesu4LoyHg
藍綠色為冬天的時候,而橙黃色則為夏天時候。601Please respect copyright.PENANAjI09CKBxMR
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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。601Please respect copyright.PENANAXrVwA2Aww0
601Please respect copyright.PENANAFKZ9LOT1nG
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。601Please respect copyright.PENANAhZnBoHT5Xd
601Please respect copyright.PENANABt2ty5mzev
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。601Please respect copyright.PENANAOpNmKXe1EG
601Please respect copyright.PENANAWMfccIBaK4
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/toc601Please respect copyright.PENANA0YXlrTyAGO
601Please respect copyright.PENANA1c65d4TNMR
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。601Please respect copyright.PENANAYPlpQAZhDu
601Please respect copyright.PENANAVLS4jE4puu
Link:601Please respect copyright.PENANAeTtf0fJ0RE
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio601Please respect copyright.PENANAGZ4oVF0eF3
601Please respect copyright.PENANAlY6dmV2KWU
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。601Please respect copyright.PENANArpxGQCBUQx
601Please respect copyright.PENANA13NWsSlkQw
https://www.instagram.com/potatopigtongue/601Please respect copyright.PENANAo90ZR6cnZy
601Please respect copyright.PENANAJWmY3An0Ej
Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117601Please respect copyright.PENANAPPPj9P6YPZ
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科普專欄–薯不揀單
Author:
薯仔聞茱莉
ISSUE #117
深入淺出–動物過冬的一道奇謀
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