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。836Please respect copyright.PENANAgOx1DCUw01836Please respect copyright.PENANA8OzzH2r5gI
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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)。836Please respect copyright.PENANAdT71sJAgPQ836Please respect copyright.PENANAuZM5Zy95a4
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(圖3)冬天期間,小臭鼩(Etruscan shrew)的大腦皮層厚度會相應減少。836Please respect copyright.PENANAHAbNMa5Yzg
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。836Please respect copyright.PENANAH8uFgxW0JA836Please respect copyright.PENANALZmmTS1vbc
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(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。836Please respect copyright.PENANAOuDJS3iJ0e
但若果食物供應足夠的話,則不會出現「腦細」的情況。836Please respect copyright.PENANAKRuYAXdTmw836Please respect copyright.PENANAAcGGqOD8Zz
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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。836Please respect copyright.PENANAensYLJhuLc
對比其他區域,L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶,836Please respect copyright.PENANA29vvCIrYSI
而CO蛋白酶的功用則為製造能源。836Please respect copyright.PENANAF2CXcLQcbR836Please respect copyright.PENANAnTAUXiqQjN
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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。836Please respect copyright.PENANAIgIa6x3wYD
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當然,亦不排除有其他的可能性。836Please respect copyright.PENANAXpoeL1sC17
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(圖6)圖中為大腦皮層磁力共振得出的影像。836Please respect copyright.PENANAbGv7aTfFMW
藍綠色為冬天的時候,而橙黃色則為夏天時候。836Please respect copyright.PENANAllS9AF2qaW836Please respect copyright.PENANALHYe74UYOJ
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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。836Please respect copyright.PENANAUVEvWnejyq
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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。836Please respect copyright.PENANAC3W6n5Uli6
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Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117836Please respect copyright.PENANAqP7DD455tP