Cov khoom xyaw xaiv yog cov kua tsib ntsev thiab cov dye, siv lead ua violet uas inhibit qhov kev loj hlob ntawm cov kab mob Gram-zoo. Cov khoom xyaw sib txawv yog lactoseFermentation ntawm cov suab thaj no ua rau acidic pH thiab ua rau pH qhia, nruab nrab liab, tig xim liab-xim liab.
Dab tsi ua rau MacConkey agar tshwj xeeb?
[2] MacConkey agar muaj cov khoom noj tseem ceeb uas xav tau rau kev loj hlob ntawm cov kab mob. Cov khoom tseem ceeb ntxiv muaj xws li crystal violet dye, bile ntsev, lactose, thiab nruab nrab liab(tus taw qhia pH). … Qhov no muab McConkey agar nws cov khoom sib txawv.
Dab tsi ua rau agar phaj txawv?
Ib qhov nruab nrab sib txawv txhawb kev loj hlob ntawm ib qho microbe tab sis txawv lawv raws li lawv metabolize lossis hloov qhov nruab nrab. Ib qho piv txwv ntawm kev sib txawv nruab nrab yog ntshav agar. Ntshav agar txawv cov microbes raws li lawv lub peev xwm los lyse cov qe ntshav liab (RBCs), cov cuab yeej hu ua hemolysis.
Dab tsi ua rau cov xov xwm no xaiv thiab sib txawv?
Kev xaiv xov xwm feem ntau xaiv rau kev loj hlob ntawm cov kab mob uas xav tau, txwv tsis pub kev loj hlob lossis tag nrho tua cov kab mob uas tsis xav tau. Cov xov xwm sib txawv siv qhov zoo ntawm cov khoom siv biochemical ntawm lub hom phiaj kab mob, feem ntau ua rau pom kev hloov pauv thaum muaj kev loj hlob ntawm cov kab mob hauv lub hom phiaj.
Cov tshuaj twg ua rau MSA txawv?
Cov khoom sib txawv hauv MSA yog qab zib mannitolCov kab mob muaj peev xwm siv mannitol ua cov khoom noj yuav tsim cov kua qaub ntawm cov fermentation uas yuav txo cov pH ntawm cov xov xwm. Lub acidity ntawm cov xov xwm yuav ua rau pH qhia, phenol liab, tig daj.
