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。834Please respect copyright.PENANA9reFcYHbLx834Please respect copyright.PENANAZaknPjRSK7
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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)。834Please respect copyright.PENANAJouRtKGtyc834Please respect copyright.PENANAuQ4BzTUfAs
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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。834Please respect copyright.PENANAXN6MjM9x6p
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。834Please respect copyright.PENANAMgebYTOCxi834Please respect copyright.PENANAhyFJD4ARxe
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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。834Please respect copyright.PENANAsKskgTelYP
但若果食物供應足夠的話,則不會出現「腦細」的情況。834Please respect copyright.PENANAAmiGfnhlRe834Please respect copyright.PENANAUKJ1ldNSj9
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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。834Please respect copyright.PENANAmF6iqTTTUY
對比其他區域,L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶,834Please respect copyright.PENANAFw6oWLSFBb
而CO蛋白酶的功用則為製造能源。834Please respect copyright.PENANA30l008em5E834Please respect copyright.PENANAM5Mrbexfc1
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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。834Please respect copyright.PENANAYvQRaWdYUC
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當然,亦不排除有其他的可能性。834Please respect copyright.PENANAq0OELkAHv5
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(圖6)圖中為大腦皮層磁力共振得出的影像。834Please respect copyright.PENANAeIsEAQkRfL
藍綠色為冬天的時候,而橙黃色則為夏天時候。834Please respect copyright.PENANAzuVhIhFJsj834Please respect copyright.PENANA3tY8m4UBii
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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。834Please respect copyright.PENANAEJkSvUhrfc
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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。834Please respect copyright.PENANAUyBH0nmuae
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Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117834Please respect copyright.PENANAVgkiwbd2me