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。621Please respect copyright.PENANAaPRUhEsoFm621Please respect copyright.PENANAU5wEfPG0M2
621Please respect copyright.PENANAttcOGRwB0g
(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)。621Please respect copyright.PENANAuSKxBa2FEW621Please respect copyright.PENANAmrKl6Dze2e
621Please respect copyright.PENANA2ZbWn1auR1
(圖3)冬天期間,小臭鼩(Etruscan shrew)的大腦皮層厚度會相應減少。621Please respect copyright.PENANAefcBPd9hZG
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。621Please respect copyright.PENANA1MIqF71l3G621Please respect copyright.PENANAVAyCdXAqXu
621Please respect copyright.PENANAjHxAqHqBC5
(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。621Please respect copyright.PENANAuXkGfpW2kW
但若果食物供應足夠的話,則不會出現「腦細」的情況。621Please respect copyright.PENANA0TN0OZAap9621Please respect copyright.PENANAuITzVmBrMU
621Please respect copyright.PENANAQDuJ2Nc3h3
(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。621Please respect copyright.PENANA5Gei3y9XJU
對比其他區域,L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶,621Please respect copyright.PENANAdmXXZsLq8s
而CO蛋白酶的功用則為製造能源。621Please respect copyright.PENANA3b50xlGGzu621Please respect copyright.PENANAsw27j91Sh5
621Please respect copyright.PENANAfC353G3tQL
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。621Please respect copyright.PENANAQ9D2tEdRpD
621Please respect copyright.PENANASZLYLB8zUS
當然,亦不排除有其他的可能性。621Please respect copyright.PENANAkdDQa12P4z
621Please respect copyright.PENANACdS3wLWaZ8
(圖6)圖中為大腦皮層磁力共振得出的影像。621Please respect copyright.PENANAziZEySjvRN
藍綠色為冬天的時候,而橙黃色則為夏天時候。621Please respect copyright.PENANA6d40xxwFxU621Please respect copyright.PENANAeugHk92LXG
621Please respect copyright.PENANAKhKUfVwR3K
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。621Please respect copyright.PENANAEdD1wylqnl
621Please respect copyright.PENANAK0HV9o78mX
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。621Please respect copyright.PENANA7ejRMTRqEx
621Please respect copyright.PENANAlzdQJoxnWH
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。621Please respect copyright.PENANAJx7PtvpSq0
621Please respect copyright.PENANAR52dG7WwRH
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/toc621Please respect copyright.PENANAWNfQp1gGbD
621Please respect copyright.PENANACnlOvPWOg9
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。621Please respect copyright.PENANAie09HkbGfR
621Please respect copyright.PENANAiBwUJSBK32
Link:621Please respect copyright.PENANAVxQKu7w37m
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio621Please respect copyright.PENANA78y74FCgMr
621Please respect copyright.PENANAxZdXvzEPfS
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。621Please respect copyright.PENANAE1qddwmcUQ
621Please respect copyright.PENANAIkBqqj5vN6
https://www.instagram.com/potatopigtongue/621Please respect copyright.PENANAmjoPPXXHa5
621Please respect copyright.PENANAMnz9Kmrtmz
Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117621Please respect copyright.PENANANycmpPrOBb