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。600Please respect copyright.PENANApCbgGEqFG8
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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)。600Please respect copyright.PENANALjrgTJUWmd
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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。600Please respect copyright.PENANAZZpqRmQIut
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。600Please respect copyright.PENANAqMDEhObGgu
600Please respect copyright.PENANArYo1lPIpIY
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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。600Please respect copyright.PENANA6qjv6igM5L
但若果食物供應足夠的話,則不會出現「腦細」的情況。600Please respect copyright.PENANA2jAqTz25yC
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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。600Please respect copyright.PENANAOw9urNxtyh
對比其他區域,L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶,600Please respect copyright.PENANAeYY3cpLBtT
而CO蛋白酶的功用則為製造能源。600Please respect copyright.PENANAzAJ9kpcezs
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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。600Please respect copyright.PENANAgwoHU3bvoU
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當然,亦不排除有其他的可能性。600Please respect copyright.PENANAOZ8Q8ZMvhg
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(圖6)圖中為大腦皮層磁力共振得出的影像。600Please respect copyright.PENANA6QAPTQ9vI9
藍綠色為冬天的時候,而橙黃色則為夏天時候。600Please respect copyright.PENANAijjq3gDa7D
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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。600Please respect copyright.PENANAwDlJDH7E6i
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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。600Please respect copyright.PENANA7YNH8TMXVf
600Please respect copyright.PENANASVOIlOuCgI
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。600Please respect copyright.PENANAvKh6U3zIm3
600Please respect copyright.PENANAfI61g3hQXe
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/toc600Please respect copyright.PENANAAXVmZkQRbV
600Please respect copyright.PENANAXdhxCMQj95
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。600Please respect copyright.PENANACBAW8od8Ku
600Please respect copyright.PENANA9sEste8U1I
Link:600Please respect copyright.PENANAW3mi5fwK6V
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio600Please respect copyright.PENANAu8a3DqPd8y
600Please respect copyright.PENANAB1D1HR3yzE
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。600Please respect copyright.PENANAOa0ZUNbe68
600Please respect copyright.PENANAzYgWuWBpB8
https://www.instagram.com/potatopigtongue/600Please respect copyright.PENANAgFtZ5W9EGo
600Please respect copyright.PENANAPlS6SPAcU0
Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117600Please respect copyright.PENANArROwfVqcsp
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科普專欄–薯不揀單
Author:
薯仔聞茱莉
ISSUE #117
深入淺出–動物過冬的一道奇謀
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