上集我們講述了小臭鼩應對寒冬的一道機制,今集我們將會講述熊貓應付寒冬的一道怪招。259Please respect copyright.PENANAEFhlJumIUm
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(圖2)有研究發現(Ref1),當攝氏低過15度的時候,熊貓會將馬糞塗滿全身,而且選糞中亦有一定的揀擇,牠們並不會採用暴露於大自然間超過10日的馬糞。259Please respect copyright.PENANAwTLu7GxKF7
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為何會塗糞上身,而且為何又如此揀擇呢?259Please respect copyright.PENANACMIfoAgzNv
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(圖3)最後科學家發現,新鮮馬糞含有一定份量的化合物,BCP/BCPO (beta-caryophyllene/caryophyllene oxide) ,而這些化合物具有抑壓負責感測寒冷的TRPM8蛋白質功效。259Please respect copyright.PENANAML0G5iTn1r
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利用老鼠作實驗體,在牠們身體塗上BCP/BCPO液體以模仿熊貓塗馬糞的舉動,對比塗上鹽水的對照群組,塗上化合物液體的老鼠較傾向行走寒冷的地方,而且亦較少互相擁抱取暖。259Please respect copyright.PENANAtQKG5OPqGp
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因此科學家推斷,熊腦大有可能透過馬糞中的化合物抑制身體的TRPM8蛋白質,以自欺欺人的方式盡量減低身體感知寒冷的能力,使自己感覺良好渡過寒冬。259Please respect copyright.PENANA98XTdzOioD
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但為何熊貓會懂得馬糞中含有對應的化合物,那就還是一個無法拆解的謎。259Please respect copyright.PENANA5ArkDq1ksV
亦有可能的是,馬糞還有另外的功用尚未被揭曉出來。259Please respect copyright.PENANAsg1vLFsQOt
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Ref1:https://www.pnas.org/content/early/2020/12/01/2004640117259Please respect copyright.PENANAeb400CPvWq
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真實影片:https://www.sciencemag.org/sites/default/files/120720-pandas.mp4259Please respect copyright.PENANA0CH3GCIEhq
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