2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Buffer, raws li peb tau hais tseg, yog qhov sib xyaw ntawm cov kab sib txuas ntawm cov kua qaub-puag uas tuaj yeem tiv thaiv kev hloov pauv hauv pH thaum me me ntawm cov acids muaj zog lossis cov hauv paus ntxiv. Thaum lub hauv paus muaj zog ntxiv, cov kua qaub tam sim no nyob rau hauv qhov tsis tuaj yeem ua rau cov hydroxide ions (OH -start superscript, pib ntawv, tsis zoo, ntawv kawg, ntawv sau kawg).
buffer tswj pH li cas?
Buffers ua haujlwm los ntawm kev ua kom tsis muaj cov kua qaub ntxiv (H + ions) lossis lub hauv paus (OH- ions)kom tswj tau cov pH nruab nrab, ua rau lawv tsis muaj zog acid lossis lub hauv paus. … Tam sim no, vim tias tag nrho cov H + ions ntxiv tau raug kaw thiab tau tsim cov kua qaub qis dua, NH4+, yog li pH ntawm lub cev tsis hloov pauv ntau.
buffers tiv thaiv kev hloov pauv hauv pH li cas?
A tsis yog ib qho tshuaj uas tiv thaiv kev hloov pauv hauv pH raws li qhov sib ntxiv ntawm me me ntawm cov kua qaub uas muaj zog lossis muaj zog hauv paus. … (Qee lub sij hawm cov tshuaj uas yog technically ib buffer tsis tiv thaiv cov kev hloov hauv pH. Qhov no tshwm sim thaum ntau cov kua qaub los yog cov hauv paus ntxiv rau qhov tsis uas lawv dhau los ua cov reactant ntau dhau.)
Cov kev daws teeb meem tsis hloov pH?
Buffers. Ib qho tsis muaj dej yog cov tshuaj aqueous uas muaj cov kua qaub tsis muaj zog thiab nws lub hauv paus conjugate los yog lub hauv paus tsis muaj zog thiab nws cov conjugate acid. Ib qho tsis muaj pH hloov me ntsis thaum me me ntawm cov kua qaub lossis cov hauv paus ntxiv rau nws. Nws yog siv los tiv thaiv kev hloov pauv hauv pH ntawm kev daws, tsis hais txog kev daws teeb meem.
Ua buffers tiv thaiv tam sim ntawdhloov pH?
Ib qhov tsis muaj zog yog cov kua qaub tsis muaj zog lossis lub hauv paus uas tiv thaiv kev hloov pauv saihauv pH.
Pom zoo:
Dab tsi yog qhov hloov pauv thiab hloov pauv hloov pauv?
Point mutations hloov ib leeg nucleotide. Frameshift kev hloov pauv yog ntxiv lossis tshem tawm ntawm nucleotides uas ua rau muaj kev hloov pauv hauv kev nyeem ntawv. frameshift thiab point mutation yog dab tsi? Ib qho kev hloov pauv cuam tshuam rau ib khub hauv paus.
Qhov kev hloov pauv no puas yuav ua rau muaj kev hloov pauv hloov pauv?
Yog li, yog tias muaj kev hloov pauv, piv txwv li, kev ntxig lossis tshem tawm ntawm nucleotide, tshwm sim, qhov no tuaj yeem ua rau kev hloov pauv ntawm kev nyeem ntawv. Nws hloov tag nrho cov amino acid ib ntus. Cov kev hloov pauv no yog hu ua frameshift mutation (tseem hu ua kev nyeem ntawv hloov pauv, nyeem ntawv hloov pauv, lossis framing yuam kev).
Qhov twg yog qhov kev hloov pauv hloov pauv hloov pauv?
Semiconservative replication piav qhia txog cov txheej txheem ntawm DNA replication nyob rau hauv tag nrho cov paub hlwb. DNA replication tshwm sim ntawm ntau lub hauv paus pib ntawm kev rov ua dua raws DNA qauv strand. Raws li DNA ob chav helix yog unwound by helicase, replication tshwm sim nyias ntawm txhua tus qauv strand nyob rau hauv antiparallel cov lus qhia.
Qhov kev hloov pauv twg yog xav tias yuav cuam tshuam los ntawm kev hloov pauv hloov pauv?
Dependent Variable Qhov sib txawv uas nyob ntawm lwm yam uas ntsuas. Cov kev hloov pauv no yuav tsum tau hloov pauv raws li qhov kev sim ua haujlwm ntawm tus kheej hloov pauv lossis hloov pauv. Nws yog cov nyhuv presumed. Qhov kev tshawb fawb hloov pauv twg yog qhov tshwm sim?
Los ntawm kev hloov pauv hloov pauv hloov pauv?
Kev hloov pauv hloov pauv hloov pauv (TMA) yog qhov isothermal (tsis hloov pauv nucleic acid kub), ib leeg-tube nucleic acid amplification system siv ob lub enzymes, RNA polymerase thiab thim rov qab kev sau ntawv. … Cov txheej txheem no tuaj yeem siv los tsom rau RNA thiab DNA.
