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.ＰＥＮＡＮＡ4fPYWGRAqC
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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.ＰＥＮＡＮＡiGd0059Jdf
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878Please respect copyright.ＰＥＮＡＮＡu7D8xYBXKN
（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.ＰＥＮＡＮＡJR0MoUozPy
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.ＰＥＮＡＮＡ4bdU7LkG8M
878Please respect copyright.ＰＥＮＡＮＡn9WwIoE6ig
878Please respect copyright.ＰＥＮＡＮＡ4KfitFRZoo
（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.ＰＥＮＡＮＡHECdIpv0ky
但若果食物供應足夠的話，則不會出現「腦細」的情況。878Please respect copyright.ＰＥＮＡＮＡpMVuqre62i
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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.ＰＥＮＡＮＡYQQKgWJ7ZU
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.ＰＥＮＡＮＡcpuGQYjWMX
而CO蛋白酶的功用則為製造能源。878Please respect copyright.ＰＥＮＡＮＡxuv22oiyXl
878Please respect copyright.ＰＥＮＡＮＡjnkUHnNRHR
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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.ＰＥＮＡＮＡlCLDccKi6N
878Please respect copyright.ＰＥＮＡＮＡCy9gh6t3xk
當然，亦不排除有其他的可能性。878Please respect copyright.ＰＥＮＡＮＡY0KNqgYLkh
878Please respect copyright.ＰＥＮＡＮＡIGSkUTylFx
（圖6）圖中為大腦皮層磁力共振得出的影像。878Please respect copyright.ＰＥＮＡＮＡYfSw7hwSAU
藍綠色為冬天的時候，而橙黃色則為夏天時候。878Please respect copyright.ＰＥＮＡＮＡhMtzuahGXU
878Please respect copyright.ＰＥＮＡＮＡIH8CSsbdbn
878Please respect copyright.ＰＥＮＡＮＡCSvqynjHfj
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.ＰＥＮＡＮＡbY2jhP1T0N
878Please respect copyright.ＰＥＮＡＮＡEUnJcYAlng
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.ＰＥＮＡＮＡqq6cFGp23s
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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.ＰＥＮＡＮＡwTGuE4Mu0F
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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.ＰＥＮＡＮＡWBM9ddGtU9
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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.ＰＥＮＡＮＡW3rWNKYxIE
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Link:878Please respect copyright.ＰＥＮＡＮＡuBliLBDpS4
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio878Please respect copyright.ＰＥＮＡＮＡCTvd6hWDih
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有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。878Please respect copyright.ＰＥＮＡＮＡSdswnu42uV
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https://www.instagram.com/potatopigtongue/878Please respect copyright.ＰＥＮＡＮＡLQzp7f8s1b
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Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117878Please respect copyright.ＰＥＮＡＮＡJch9kCe1YP
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