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。622Please respect copyright.PENANANVpKXTOq0h622Please respect copyright.PENANACDCtXXm6Dd
622Please respect copyright.PENANALR3o6M0tiA
(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)。622Please respect copyright.PENANAkusnGE7WW9622Please respect copyright.PENANAkjViO9SxRO
622Please respect copyright.PENANAtO0vqe5Olo
(圖3)冬天期間,小臭鼩(Etruscan shrew)的大腦皮層厚度會相應減少。622Please respect copyright.PENANAzCEoYUyCyw
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。622Please respect copyright.PENANALANcxcPbzU622Please respect copyright.PENANAIpyfE9Tour
622Please respect copyright.PENANAPjSv4VTZVK
(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。622Please respect copyright.PENANAKzK8dBD5wR
但若果食物供應足夠的話,則不會出現「腦細」的情況。622Please respect copyright.PENANAgBa4679dCW622Please respect copyright.PENANAFXG7VoPpzX
622Please respect copyright.PENANAITuOxXoG60
(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。622Please respect copyright.PENANAFgeVoa949u
對比其他區域,L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶,622Please respect copyright.PENANAwrj9csMllu
而CO蛋白酶的功用則為製造能源。622Please respect copyright.PENANAJdQtgKajoD622Please respect copyright.PENANAIU6lrkr405
622Please respect copyright.PENANAzNh8ayVZlB
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。622Please respect copyright.PENANANio0MnGZZT
622Please respect copyright.PENANAVh1cvwR680
當然,亦不排除有其他的可能性。622Please respect copyright.PENANAy8PgTdEgm2
622Please respect copyright.PENANA3jFpPmZ2uQ
(圖6)圖中為大腦皮層磁力共振得出的影像。622Please respect copyright.PENANAhvWVpelZW3
藍綠色為冬天的時候,而橙黃色則為夏天時候。622Please respect copyright.PENANAUXN4gRw4PU622Please respect copyright.PENANAc6BVGDKc7l
622Please respect copyright.PENANAd5jUX7SMxk
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。622Please respect copyright.PENANAmoQ0t2u5yG
622Please respect copyright.PENANAwLTW17Lq3K
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。622Please respect copyright.PENANAuRAEnlpAeU
622Please respect copyright.PENANANrqn3MquNS
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。622Please respect copyright.PENANAB9sg8fwD4a
622Please respect copyright.PENANAL11gf0ioiv
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/toc622Please respect copyright.PENANAKwn6EhxAJF
622Please respect copyright.PENANAc0yERFZoRs
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。622Please respect copyright.PENANAkrFm5PEdjE
622Please respect copyright.PENANAt8GbUXVDsw
Link:622Please respect copyright.PENANAb552KBLsnK
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio622Please respect copyright.PENANAfEdxQnMGhO
622Please respect copyright.PENANAwjcSlWZ8Yt
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。622Please respect copyright.PENANAOTN4vyQcsA
622Please respect copyright.PENANAdDLWqiQSp8
https://www.instagram.com/potatopigtongue/622Please respect copyright.PENANAaI06OqCdIl
622Please respect copyright.PENANAt1lIPy77O9
Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117622Please respect copyright.PENANApj5AJEUD3z
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深入淺出–動物過冬的一道奇謀
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