Cov khoom

Cov tshuaj lom neeg tsis zoo yog cov khoom siv organic uas muaj cov nyhuv neutralizing ntawm hydrogen ions.Nyob rau hauv txoj kev no, cov tshuaj lom neeg tsis tuaj yeem pab tswj lub cev ntawm pH kom raug kom cov txheej txheem biochemical txuas ntxiv ua haujlwm tau zoo.

Feem ntau cov buffers muaj cov kua qaub tsis muaj zog thiab lub hauv paus tsis muaj zog.Lawv pab tswj cov pH txawm tias tom qab ntxiv cov kua qaub los yog lub hauv paus.Piv txwv li, cov ntshav muaj carbonic acid (H2CO3)-bicarbonate (HCO3-) buffer system.Hauv cov kab ke no, cov kua qaub tsis muaj zog cuam tshuam rau me me, muab bicarbonate ions.Cov ions no muaj peev xwm los khi ntxiv H + ions ntab ncig hauv cov ntshav.Qhov no hloov kho cov kua qaub tsis muaj zog thiab txo cov H + ions hauv kev daws.

Biological buffers kuj tuaj yeem yog cov kab ke tsis sib xws uas pab tswj cov pH nyob ib puag ncig ntawm lub cev pH.Thaum ua cov kev sim nrog ib tus neeg cov khoom ntawm cov hlwb los yog ib tus neeg cov protein, cov kws tshawb fawb yuav tsum coj mus rau hauv tus account qhov tsis lawv siv.Yog tsis muaj qhov tsis zoo, cov haujlwm ntawm cov khoom uas lawv xav kawm yuav txo qis.

Buffers yog cov tshuaj uas pab cov kua ua kua los hloov nws cov kua qaub thaum lwm cov tshuaj ntxiv uas yuav ua rau muaj kev hloov pauv ntawm cov khoom no.Buffers yog qhov tseem ceeb rau cov cell nyob.Qhov no yog vim buffers tswj pH txoj cai ntawm cov kua.PH yog dab tsi?Nws yog ib qho kev ntsuas ntawm acidic kua li cas.Piv txwv li, kua txiv qaub muaj pH tsawg ntawm 2 mus rau 3 thiab yog acidic heev - yog li cov kua txiv hmab txiv ntoo hauv koj lub plab uas zom zaub mov.Txij li cov kua qaub acidic tuaj yeem rhuav tshem cov protein, thiab cov hlwb yog chock-tag nrho ntawm cov protein, cov hlwb yuav tsum muaj cov buffers sab hauv thiab sab nraum lawv txhawm rau tiv thaiv lawv cov tshuab protein.Cov pH hauv ib lub cell yog li 7, uas yog suav tias yog nruab nrab zoo li cov dej ntshiab.