Qhov sib txawv tseem ceeb ntawm assimilatory thiab dissimilatory sulphate txo yog tias assimilatory sulphate txo ua cysteine ua cov khoom kawg thaum dissimilatory sulphate txo cov sulfide ua cov khoom kawg.
Sulphate txo yog ib qho ntawm txoj hauv kev ua pa anaerobic. Tsis tas li ntawd, qee cov microbes uas nyob ntawm qhov xwm txheej anaerobic muaj peev xwm txo cov sulphates kom tau txais lub zog. Ntxiv mus, muaj ob txoj hauv kev tseem ceeb uas sulphates txo; lawv yog txoj kev assimilatory thiab txoj kev dissimilatory. Qhov twg, nyob rau hauv txoj kev assimilatory, txo cov sulphate yields Cysteine raws li nws cov khoom kawg, uas tuaj yeem raug assimilated hauv cov kab mob nyob xws li cov nroj tsuag thiab ntau dua eukaryotes. Ntawm qhov tsis sib xws, txoj kev dissimilatory ntawm sulphate txo yields sulfide ua cov khoom kawg. Li no, qhov tseem ceeb tshaj plaws, qhov sib txawv ntawm qhov txo qis assimilatory thiab dissimilatory sulphate yog hom khoom kawg ntawm txhua qhov khoom.
Assimilatory Sulphate Reduction yog dab tsi?
Raws li tau hais ua ntej, assimilatory sulphate txo yog ib qho ntawm ob txoj hauv kev tseem ceeb hauv kev txo cov sulphate, uas yog ib txoj hauv kev tseem ceeb ntawm kev ua pa anaerobic. Tshwj xeeb, nws tshwm sim hauv microbes nrog rau cov kab mob prokaryotic, fungi thiab cov kab mob photosynthetic. Cov kab mob no muaj peev xwm ua rau muaj kev cuam tshuam anaerobic rau lub zog tsim. Ntawm no, daim ntawv tseem ceeb ntawm lub zog rau sulphate txo cov kab mob yog cov sulfate. Cov sulfate txo mus rau hauv cysteine, uas yog cov khoom tseem ceeb kawg ntawm txoj kev no. Tsis tas li ntawd, cov enzymes kho cov txheej txheem no. Tsis tas li ntawd, txoj kev no nyob ntawm ATP. Cov khoom kawg, cysteine , yog qhov tseem ceeb rau kev tsim cov pob txha pob txha, uas yog nyob rau hauv daim ntawv ntawm cysteine amino acid los yog homocysteine.
Daim duab 01: Sulphate Txo Microbe
Nyob rau hauv txoj hauv kev assimilatory sulphate txo txoj hauv kev, pib cov tshuaj sulfate ua ntej hloov mus rau adenosine - 5 - phosphosulfate (APS). Tom qab ntawd, APS txo kom tsim sulfide ntawm cov tshuaj tiv thaiv enzyme-catalyzed. Tom qab ntawd, cov kauj ruam kawg hauv txoj kev assimilatory ntawm kev txo cov sulphate yog kev sib txuas ntawm cysteine los ntawm sulfide. Tag nrho cov txheej txheem no yuav tsum muaj ib qho enzyme hu ua O-acetylserine sulfhydrylase.
Dab tsi yog Dissimilatory Sulphate Reduction?
Dissimilatory sulphate txo yog cov txheej txheem anaerobic. Nws yog txoj hauv kev thib ob hauv txoj hauv kev hauv kev txo cov sulphate. Ntawm no ib yam nkaus, qee cov prokaryotes, eukaryotic fungi thiab cov kab mob photosynthetic muaj peev xwm txo tau cov sulphate nyob rau hauv txoj kev dissimilatory. Txawm li cas los xij, dissimilatory sulphate txo qis tsim sulfide ua nws cov khoom kawg. Zoo li assimilatory sulphate txo, nws kuj yog cov txheej txheem enzyme-mediated thiab nyob ntawm ATP.
Daim duab 02: Dissimilatory Sulphate Reduction
Yog li, zoo ib yam li txoj hauv kev assimilatory, thawj cov tshuaj tiv thaiv ntawm no yog kev ua kom cov sulphate los ua Adenosine - 5 - phosphosulphate (APS). Tom qab ntawd, APS ua sulphite thiab tom qab ntawd sulfide ntawm cov enzymes-fais fab tshuaj tiv thaiv. Yog li ntawd, nyob rau hauv txoj kev dissimilatory ntawm sulphate txo, cov khoom kawg yog sulfide, ib qho inorganic compound.
Dab tsi yog qhov zoo sib xws ntawm Assimilatory thiab Dissimilatory Sulphate Txo?
- Ob txoj kev ua haujlwm nyob rau hauv cov xwm txheej anaerobic.
- Tsis tas li, qhov pib sib xyaw ntawm ob txheej txheem yog sulphate.
- Tsis tas li ntawd, sulphate ua raws li qhov kawg electron txais nyob rau hauv ob txoj kev.
- Ntxiv mus, ob qho kev txo qis yog ATP nyob ntawm.
- Ntxiv rau, kev ua kom cov sulphate rau adenosine - 5 - phosphosulphate yog ib txwm muaj rau ob txoj kev.
- Dhau li ntawm, lawv yog cov tshuaj tiv thaiv enzyme-catalyzed.
- Ob txoj kev txo qis yog ua los ntawm prokaryotes, fungi thiab cov kab mob photosynthetic.
Qhov txawv ntawm Assimilatory thiab Dissimilatory Sulphate Reduction yog dab tsi?
Assimilatory thiab Dissimilatory Sulphate Txo yog ob txheej txheem anaerobic uas cov sulphate ua raws li cov khoom pib. Tshwj xeeb, microbes siv cov txheej txheem no kom tau txais lub zog rau lawv cov dej num. Txawm li cas los xij, qhov sib txawv tseem ceeb ntawm kev txo qis assimilatory thiab dissimilatory sulphate yog qhov txo qis assimilatory sulphate thaum kawg tsim cysteine thaum lub dissimilatory sulphate txo thaum kawg tsim sulfides. Lwm qhov sib txawv ntawm assimilatory thiab dissimilatory sulphate txo yog cov enzymes uas koom nrog hauv catalysis ntawm cov tshuaj tiv thaiv. Lub enzyme O - acetylserine sulfhydrylase catalyzes assimilatory sulphate txo thaum dissimilatory sulfite reductase catalyzes lub dissimilatory sulphate txo.
Cov hauv qab no infographic ntawm qhov sib txawv ntawm assimilatory thiab dissimilatory sulphate txo cov ntsiab lus ntxiv.
Summary – Assimilatory vs Dissimilatory Sulphate Txo
Assimilatory thiab Dissimilatory Sulphate txo cov txheej txheem yog cov txheej txheem anaerobic. Nyob rau hauv ob qho tib si txheej txheem, sulphate ua raws li qhov kawg electron txais. Tsis tas li ntawd, ob qho tib si txheej txheem yog ua los ntawm microbes thiab cov kab mob photosynthetic. Ntxiv mus, lawv ob leeg nyob ntawm ATP ib yam nkaus. Txawm li cas los xij, assimilatory txo qis ntawm sulphate yog cov txheej txheem uas tsim cysteine thiab homocysteine yog cov khoom kawg. Nyob rau hauv sib piv, dissimilatory sulphate txo ua sulfide ua cov khoom kawg. Yog li ntawd, qhov no yog qhov txawv ntawm assimilatory thiab dissimilatory sulphate txo.
