Qhov Tseem Ceeb - Nitrifying vs Denitrifying Bacteria
Nitrogen yog ib qho tseem ceeb ntawm cov khoom muaj sia, thiab nws yog ib qho tseem ceeb heev uas cov nitrogen muaj nyob tau zoo sib npaug thiab rov ua dua tshiab kom siv tau los ntawm cov kab mob muaj sia. Nitrogen muaj nyob rau hauv nws cov natural diatomic daim ntawv (N 2), uas tsis tuaj yeem nqus los ntawm cov nroj tsuag rau lawv txoj haujlwm lom neeg. Cov txheej txheem ntawm oxidizing tsau diatomic nitrogen rau hauv nitrates thiab nitrites hu ua nitrification; Qhov no feem ntau yog ua los ntawm cov kab mob uas tuaj yeem siv nitrogen hauv nws daim ntawv ruaj khov. Yuav kom tswj tau qhov sib npaug ntawm nitrogen nyob rau hauv qhov chaw, diatomic nitrogen yuav tsum tau tsim los ntawm ib tug recycle mechanism, qhov twg cov nitrates thiab nitrites raug txo rov qab mus rau diatomic nitrogen los ntawm cov kab mob. Cov txheej txheem no yog hu ua denitrification. Yog li, cov kab mob koom nrog hauv ob txoj haujlwm no yog cov kab mob nitrifying thiab cov kab mob denitrifying. Qhov sib txawv tseem ceeb ntawm cov kab mob nitrifying thiab denitrifying yog cov kab mob nitrifying muaj peev xwm ntawm oxidizing muaj ammonia rau nitrate thiab nitrite thaum cov kab mob denitrifying muaj peev xwm txo tau nitrates thiab nitrites rau nws ib txwm tshwm sim diatomic daim ntawv nitrogen gas.
Nitrifying Bacteria yog dab tsi?
Nitrifying bacteria yog chemolithotrophic aerobic bacteria uas muaj peev xwm oxidizing NH3 hauv av rau nitrate lossis nitrite. NH3 hauv av muaj nyob rau hauv nws daim ntawv ionic ntawm NH4+ Ua tiav nitrification tshwm sim hauv ob txheej txheem, qhov twg NH3 yog thawj zaug oxidized rau Nitrite (NO2–) ua raws li Nitrate (NO 3–), uas yog siv los ntawm cov nroj tsuag.
- NH4+ + O2 NO2 – + H+ + H2O
- NO2–+ O2 NO3
Qhov sib txawv ntawm Nitrifying thiab Denitrifying Bacteria Daim duab 01: Nitrogen Cycle
Piv txwv ntawm Nitrifying kab mob uas ua tiav thawj cov tshuaj tiv thaiv ntawm nitrification suav nrog Nitrosomonas thiab Nitrospira uas muaj nyob rau hauv β subclass ntawm Proteobacteria. Cov kab mob uas muaj peev xwm ua tiav cov tshuaj tiv thaiv thib ob ntawm cov txheej txheem nitrification thiab tsim cov nitrate suav nrog Nitrobacter, uas yog nyob rau hauv α subclass ntawm Proteobacteria.
Dab tsi yog Denitrifying Bacteria?
Cov kab mob Denitrifying yog ib hom kab mob chemolithotrophic anaerobic lossis aerobic kab mob uas muaj peev xwm txo tau nitrates thiab nitrites rau gaseous nitrogen cov ntaub ntawv. Ob daim ntawv tseem ceeb yog diatomic Nitrogen (N2) thiab Nitrous oxide (N2O). Los ntawm cov txheej txheem no, atmospheric Nitrogen theem tau rov tsim dua mus rau qhov qub concentration. Cov tshuaj tiv thaiv denitrification yog qhia hauv qab no.
NO3– NO2–→ TSIS + N2O → N2 (g)
Daim duab 02: Denitrification
Facultative anaerobes koom nrog hauv denitrification yog Thiobacillus denitrificans, thiab Micrococcus denitrificans. Pseudomonas denitificans yog cov kab mob aerobic denitrifying.
Dab tsi zoo sib xws ntawm Nitrifying thiab Denitrifying Bacteria?
- Nitrifying thiab denitrifying kab mob yog chemolithoautotrophic.
- Ntau tus yog cov kab mob hauv av.
- Ob pawg koom nrog tswj qhov sib npaug ntawm nitrogen hauv biosphere
- Ob leeg nitrifying thiab denitrifying cov kab mob muaj cov enzymes uas catalyze cov tshuaj tiv thaiv nitrification thiab denitrification
- Ob leeg cov kab mob nitrifying thiab denitrifying yog siv kev lag luam.
Qhov txawv ntawm Nitrifying thiab Denitrifying Bacteria yog dab tsi?
Nitrifying vs Denitrifying Bacteria |
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| Nitrifying kab mob yog cov kab mob uas muaj peev xwm oxidizing ammonium hauv av rau nitrates, uas tuaj yeem siv los ntawm cov nroj tsuag. | Cov kab mob Denitrifying yog cov kab mob uas muaj peev xwm txo tau nitrates los yog nitrites rau cov ntaub ntawv gaseous xws li nitrous oxide lossis diatomic nitrogen. |
| Yam Kev Ua Phem | |
| Nitrification yog cov tshuaj tiv thaiv oxidation. | Denitrification yog qhov txo qis. |
| khoom tsim | |
| Nitrifying kab mob tsim nitrate lossis nitrite. | Cov kab mob Denitrifying tsim nitrous oxide lossis diatomic nitrogen. |
| Precursors for Reaction | |
| Nitrifying kab mob siv ammonia lossis ammonium ions. | Cov kab mob Denitrifying siv nitrate lossis nitrite ua lawv cov precursors. |
| Kev xav tau oxygen | |
| Feem ntau ntawm cov kab mob nitrifying yog aerobic. | Cov kab mob Denitrifying tuaj yeem ua aerobic lossis facultative anaerobic. |
| Nitrifying kab mob yog siv los ua nitrogen chiv. | Denitrifying kab mob yog siv rau hauv kev tswj dej khib nyiab kom degrade nitrogenous pov tseg. |
Summary – Nitrifying vs Denitrifying Bacteria
Lub voj voog nitrogen yog ib qho tseem ceeb tshaj plaws ntawm biogeochemical cycles nyob rau hauv qhov chaw uas atmospheric Nitrogen hloov mus rau ntau hom tshuaj, ua rau nws muaj sia nyob mus siv. Cov txheej txheem ntawm nitrification yog cov txheej txheem oxidative uas muaj nitrogen tam sim no raws li ammonium hauv av hloov mus rau nitrates thiab nitrites, ua rau kom muaj bio-muaj nitrogen rau cov kab mob. Thaum lub sij hawm denitrification, nitrites thiab nitrates raug txo rau hauv cov ntawv gaseous (diatomic nitrogen thiab nitrous oxide). Qhov no yog qhov sib txawv ntawm cov kab mob nitrifying thiab denitrifying. Ob qho txheej txheem no tau ua kom muaj txiaj ntsig zoo los ntawm kev koom tes ntawm microbes, tshwj xeeb tshaj yog cov kab mob chemolithotrophic. Tam sim no, cov kab mob no tau suav tias yog kev lag luam tseem ceeb hauv kev ua liaj ua teb thiab ib puag ncig biotechnology. Yog li ntawd, lawv tau dhau los ua lub ntsiab lus tshawb fawb txog kev tshawb fawb hauv Biotechnology.
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Koj tuaj yeem rub tawm PDF version ntawm kab lus no thiab siv nws rau offline hom phiaj raws li daim ntawv ceeb toom. Thov download PDF version ntawm no Qhov txawv Ntawm Nitrifying thiab Denitrifying Bacteria.
