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。619Please respect copyright.PENANAdZbcSvDZWd619Please respect copyright.PENANA7KxIF6bxdd
619Please respect copyright.PENANANOOVYHSNQQ
(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)。619Please respect copyright.PENANAkWXCsDLO26619Please respect copyright.PENANAi5so11HvRT
619Please respect copyright.PENANAX4rUeASdZC
(圖3)冬天期間,小臭鼩(Etruscan shrew)的大腦皮層厚度會相應減少。619Please respect copyright.PENANAjiNg56Gi31
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。619Please respect copyright.PENANAY1cp72UlMD619Please respect copyright.PENANAbsWYA5x21R
619Please respect copyright.PENANAydcGuypWQd
(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。619Please respect copyright.PENANAFpxM95yanm
但若果食物供應足夠的話,則不會出現「腦細」的情況。619Please respect copyright.PENANAZJ9V0ZEyTp619Please respect copyright.PENANALL8aVqymwo
619Please respect copyright.PENANAgXcjAh2evB
(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。619Please respect copyright.PENANAflNVCwx8Is
對比其他區域,L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶,619Please respect copyright.PENANAy126z06qhD
而CO蛋白酶的功用則為製造能源。619Please respect copyright.PENANAlkr1ZIT3Y9619Please respect copyright.PENANAOxYtCd1Otj
619Please respect copyright.PENANABolFlzhjSw
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。619Please respect copyright.PENANAqvUQii9tsm
619Please respect copyright.PENANAYmGdrlMvL7
當然,亦不排除有其他的可能性。619Please respect copyright.PENANA5N05IYlUnV
619Please respect copyright.PENANA26ggHIRUVU
(圖6)圖中為大腦皮層磁力共振得出的影像。619Please respect copyright.PENANAvFqWwf5zAI
藍綠色為冬天的時候,而橙黃色則為夏天時候。619Please respect copyright.PENANACKEOX0Xe4N619Please respect copyright.PENANA0yGku2kuxA
619Please respect copyright.PENANA0ioKspAkpf
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。619Please respect copyright.PENANAhQP7jqxuIc
619Please respect copyright.PENANA8J9xJ3MCJB
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。619Please respect copyright.PENANAbeXP9SOf0L
619Please respect copyright.PENANAeOX0eSXKm3
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。619Please respect copyright.PENANAkMUJrkxkev
619Please respect copyright.PENANAuWuVcTa0uG
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/toc619Please respect copyright.PENANAHMtVEUfhBs
619Please respect copyright.PENANA5vc75yVSrn
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。619Please respect copyright.PENANAXNU6VRr3R7
619Please respect copyright.PENANAT0VvW4jFv2
Link:619Please respect copyright.PENANAknfcup0n36
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio619Please respect copyright.PENANAW82mWxgejr
619Please respect copyright.PENANASsK8Wd0UUp
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。619Please respect copyright.PENANAflfpe00gTA
619Please respect copyright.PENANAkQ8TJfpp2N
https://www.instagram.com/potatopigtongue/619Please respect copyright.PENANAVmXnxtZSKr
619Please respect copyright.PENANACxJEMhsUIB
Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117619Please respect copyright.PENANAQN16jYuc8L