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。849Please respect copyright.PENANAvhiE5Bk0gZ849Please respect copyright.PENANA5XQXW58nlD
849Please respect copyright.PENANAIqfeutm3p4
(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)。849Please respect copyright.PENANASopuneEniw849Please respect copyright.PENANAsOTmLQdQWH
849Please respect copyright.PENANAVjWDbLB65E
(圖3)冬天期間,小臭鼩(Etruscan shrew)的大腦皮層厚度會相應減少。849Please respect copyright.PENANAsAKIHo9Tae
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。849Please respect copyright.PENANAnAIH16F7yK849Please respect copyright.PENANAPywaL7Hf3K
849Please respect copyright.PENANAMtuHfYA1OP
(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。849Please respect copyright.PENANAW2rp1dAeBa
但若果食物供應足夠的話,則不會出現「腦細」的情況。849Please respect copyright.PENANAlASShFfbtZ849Please respect copyright.PENANA0si4UJ6fiW
849Please respect copyright.PENANAb0FCjRdV5M
(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。849Please respect copyright.PENANADA1A7VWOSy
對比其他區域,L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶,849Please respect copyright.PENANArW49VbpYkb
而CO蛋白酶的功用則為製造能源。849Please respect copyright.PENANAJ30fAVJpbI849Please respect copyright.PENANA53e8h2IIFQ
849Please respect copyright.PENANAGkYBem1nYA
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。849Please respect copyright.PENANAj95vujXFxz
849Please respect copyright.PENANASXqFvoxLb8
當然,亦不排除有其他的可能性。849Please respect copyright.PENANAC0UXRN3SAk
849Please respect copyright.PENANABLu7nW6O0f
(圖6)圖中為大腦皮層磁力共振得出的影像。849Please respect copyright.PENANAkMPqe4uiL6
藍綠色為冬天的時候,而橙黃色則為夏天時候。849Please respect copyright.PENANACz6Gg7rhsd849Please respect copyright.PENANAFUjBPb2Wem
849Please respect copyright.PENANAzqDpIQ5VUL
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。849Please respect copyright.PENANANTejBOfeio
849Please respect copyright.PENANAaPKp0yjRwH
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。849Please respect copyright.PENANAVLp4N4DRSe
849Please respect copyright.PENANAKRsVv0im51
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。849Please respect copyright.PENANAmDYOdXbImp
849Please respect copyright.PENANAqInzwlKZui
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/toc849Please respect copyright.PENANATmZ25T6bF2
849Please respect copyright.PENANA8oZCfP3zVg
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。849Please respect copyright.PENANAZaZNLMqgUj
849Please respect copyright.PENANA6R2uoRvhEH
Link:849Please respect copyright.PENANAxRfvHgQcC7
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio849Please respect copyright.PENANAClMOc0L2EM
849Please respect copyright.PENANA7txAGvmBKz
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。849Please respect copyright.PENANA1aAoAtjUmn
849Please respect copyright.PENANAw4gfsYTolz
https://www.instagram.com/potatopigtongue/849Please respect copyright.PENANArTsMpfr0fj
849Please respect copyright.PENANAbXXmGNruoV
Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117849Please respect copyright.PENANAXWHWuyhnFc
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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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