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。878Please respect copyright.ＰＥＮＡＮＡOXwlOBIbu4
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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)。878Please respect copyright.ＰＥＮＡＮＡMARzgt5xUN
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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。878Please respect copyright.ＰＥＮＡＮＡAC7boEhVLc
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。878Please respect copyright.ＰＥＮＡＮＡBvlcY6dRKF
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878Please respect copyright.ＰＥＮＡＮＡB6ONxAGtNH
（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。878Please respect copyright.ＰＥＮＡＮＡw82nNhLlJc
但若果食物供應足夠的話，則不會出現「腦細」的情況。878Please respect copyright.ＰＥＮＡＮＡgbgOPS7JO9
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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。878Please respect copyright.ＰＥＮＡＮＡil2tVsQXJn
對比其他區域，L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶，878Please respect copyright.ＰＥＮＡＮＡpcv55VMWId
而CO蛋白酶的功用則為製造能源。878Please respect copyright.ＰＥＮＡＮＡI7SnffgYNR
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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。878Please respect copyright.ＰＥＮＡＮＡXODZFUvEbh
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當然，亦不排除有其他的可能性。878Please respect copyright.ＰＥＮＡＮＡXRq8TITmvW
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（圖6）圖中為大腦皮層磁力共振得出的影像。878Please respect copyright.ＰＥＮＡＮＡ8acBqwDYwG
藍綠色為冬天的時候，而橙黃色則為夏天時候。878Please respect copyright.ＰＥＮＡＮＡfEZkel6Nu8
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878Please respect copyright.ＰＥＮＡＮＡwRdAUNMPGq
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。878Please respect copyright.ＰＥＮＡＮＡnBGLRUfinB
878Please respect copyright.ＰＥＮＡＮＡkwdkZ39FpM
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。878Please respect copyright.ＰＥＮＡＮＡ3SJ3Ne6pgc
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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。878Please respect copyright.ＰＥＮＡＮＡqobhr5duwb
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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/toc878Please respect copyright.ＰＥＮＡＮＡzq6Lk9WxSJ
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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。878Please respect copyright.ＰＥＮＡＮＡ2ePfv4Pts3
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Link:878Please respect copyright.ＰＥＮＡＮＡN6wWDg756Z
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio878Please respect copyright.ＰＥＮＡＮＡ2WsS8WVIyi
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有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。878Please respect copyright.ＰＥＮＡＮＡuV3QVRJfZK
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https://www.instagram.com/potatopigtongue/878Please respect copyright.ＰＥＮＡＮＡwkJrPpCjdr
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Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117878Please respect copyright.ＰＥＮＡＮＡibc4uNXaTZ
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