如果測量一個人的細胞數量,事實上只有25%是屬於人體細胞,其餘的75%均由細菌及真菌所據。1715Please respect copyright.PENANAJdfqmySx03
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細菌及真菌可以說是「無處不在」,它們不但寄宿於我們的皮膚外層,亦同時駐紮在我們身體內的腸道及各器官部位,與我們成呈共生關係。1715Please respect copyright.PENANAh4If93V2Wn
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最近有科學家發表學術文章(Ref1),講述位於汗腺附近的細菌就是腋下異味的其中一個元兇。1715Please respect copyright.PENANAcOvXSaHfIs
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(圖1)我們身體的肝腺大致分為兩種,外分泌汗腺(Eccrine Sweat Glands)及大汗腺1715Please respect copyright.PENANAEMfuTGKt1j
(Apocrine Sweat Glands)1715Please respect copyright.PENANApcR8VKo5Vk
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前者接近遍佈全身,不與毛髮連接。後者主要位於腋下、乳頭及私處部位,與毛髮連接。1715Please respect copyright.PENANAzOZStmZ0Ta
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外分泌汗腺的主要功能就是散發汗水幫助散熱,調節體溫。1715Please respect copyright.PENANAetyfr6Vq0x
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而大汗腺的主要功能,到目前為止仍未能搞得清楚。1715Please respect copyright.PENANAv3WbmQBwpD
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(圖2)下列三點為文中所找出的異味散發機制。1715Please respect copyright.PENANA25acWNtTzp
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1.大汗腺釋出無味物質Cys-Gly-3M3SH。1715Please respect copyright.PENANAtjfRRXu510
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2.腋下某品種的葡萄球菌消化Cys-Gly-3M3SH。1715Please respect copyright.PENANAIpNT0j70af
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3. 葡萄球菌消化過後,吐出帶有異味的3M3SH。1715Please respect copyright.PENANAoUlHBNa0wR
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換句話說,腋下的異味就是由這些細菌引致而成的。1715Please respect copyright.PENANAzX9p8gFIiS
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(圖3)為作進一步的證實,科學家利用黃金葡萄球菌作對照實驗。1715Please respect copyright.PENANAKHb72gAZje
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他們發現人葡萄球菌的近親黃金葡萄球菌並沒能夠將無味的Cys-Gly-3M3SH消化成為帶有異味的3M3SH。1715Please respect copyright.PENANAOoFjV0xgK4
但是,當把人葡萄球菌其中一隻酵素轉移到黃金葡萄球菌後,無味的Cys-Gly-3M3SH便能夠被消化成為帶有異味的3M3SH,證實異味是由那隻酵素所致。1715Please respect copyright.PENANAM2oRFFy4yw
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這隻酵素一直以來並沒有被前人發現,亦即是說,只要能夠研發出抑制那隻酵素的止汗劑的話,腋下的大部份異味亦能得以除去;1715Please respect copyright.PENANAPbUuH6v2xP
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異味的產生,基本上是由硫醇(Thioalcohol)及脂肪酸(Fatty acid)而成。此文章所談及的機制純屬與硫醇的產生有關,沒有觸及脂肪酸那一方面。1715Please respect copyright.PENANAsD9L9jR1rw
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而臭狐是否由這細菌引起或有份參與,文中並沒有提及。1715Please respect copyright.PENANA0YyzeqlNnx
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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。1715Please respect copyright.PENANASdfG5slfoe
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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/toc1715Please respect copyright.PENANAO24qRnhgxs
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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。1715Please respect copyright.PENANAfPwlGDNcWb
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Link:1715Please respect copyright.PENANAWeASz3iibp
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio1715Please respect copyright.PENANAlztjsoYOB1
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有興趣接收科普資訊的話,歡迎follow IG: potatopigtongue。1715Please respect copyright.PENANAWbtGlSoXhF
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Ref1:https://www.nature.com/articles/s41598-020-68860-z1715Please respect copyright.PENANACXzj8W8e3B