Kev Tiv Thaiv ntawm Cov Kab Mob Microecology ntawm Daim Tawv Nqaij

Qhov cuam tshuam tiv thaiv ntawmKev Tshawb Fawb Txog Kab Mob Ntawm Tawv Nqaijntawm daim tawv nqaij

Cov qog sebaceous tso cov lipids, uas cov kab mob me me metabolized los tsim cov lipid zaj duab xis emulsified. Cov lipid zaj duab xis no muaj cov roj fatty acids dawb, tseem hu ua cov kua qaub zaj duab xis, uas tuaj yeem neutralize cov alkaline tshuaj uas muaj kuab paug rau ntawm daim tawv nqaij thiab tiv thaiv cov kab mob txawv teb chaws (cov kab mob hla). , fungi thiab lwm yam kab mob pathogenic loj hlob, yog li thawj txoj haujlwm ntawm cov kab mob ntawm daim tawv nqaij ib txwm yog qhov tseem ceeb tiv thaiv.

Kev nkag mus rau hauv daim tawv nqaij thiab cov khoom siv ntxiv, suav nrog cov qog hws (cov qog hws), cov qog sebaceous, thiab cov plaub hau follicle, muaj lawv tus kheej cov nroj tsuag tshwj xeeb. Cov qog sebaceous txuas cov plaub hau follicles los tsim cov follicular sebaceous unit, uas tso tawm cov roj lipid nplua nuj hu ua sebum. Sebum yog ib daim zaj duab xis tiv thaiv hydrophobic uas tiv thaiv thiab ua kom cov tawv nqaij thiab cov plaub hau ntub thiab ua haujlwm ua ib daim ntaub thaiv kab mob. Cov qog sebaceous yog hypoxic, txhawb kev loj hlob ntawm cov kab mob facultative anaerobic xws liP. acnes, uas muaj P. acnes lipase uas ua rau sebum puas lwj, hydrolyzes triglycerides hauv sebum, thiab tso cov roj fatty acids dawb. Cov kab mob tuaj yeem lo rau cov roj fatty acids dawb no, uas pab piav qhia txog kev loj hlob ntawm cov qog sebaceous los ntawm P. acnes, thiab cov roj fatty acids dawb no kuj pab txhawb rau qhov acidity ntawm daim tawv nqaij (pH ntawm 5). Ntau cov kab mob pathogenic, xws li Staphylococcus aureus thiab Streptococcus pyogenes, raug txwv tsis pub nyob rau hauv ib puag ncig acidic thiab yog li ntawd zoo rau kev loj hlob ntawm coagulase-negative staphylococci thiab coryneform bacteria. Txawm li cas los xij, kev txhaws ntawm daim tawv nqaij ua rau muaj kev nce pH uas yuav pab txhawb kev loj hlob ntawm S. aureus thiab S. pyogenes. Vim tias tib neeg tsim cov roj triglycerides ntau dua li lwm yam tsiaj, ntau P. acnes nyob hauv tib neeg daim tawv nqaij.