2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Lub Hiav Txwv Aral yog nyob rau hauv Central Asia, nruab nrab ntawm sab qab teb ntawm Kazakhstan thiab Northern Uzbekistan. … Tsoom fwv Soviet tau txiav txim siab nyob rau xyoo 1960s kom hloov cov dej ntws no kom lawv tuaj yeem tso dej rau thaj tsam suab puam ib puag ncig Hiav txwv kom txaus siab rau kev ua liaj ua teb es tsis muab cov dej hiav txwv Aral.
Vim li cas lub pas dej hiav txwv Aral thiaj tsim tau?
Nyob hauv kev siv zog kawg los cawm qee lub pas dej, Kazakhstan tau tsim lub pas dej nruab nrab ntawm sab qaum teb thiab sab qab teb ntawm Hiav Txwv Aral. Kok-Aral dike thiab pas dej ua ke, ua tiav xyoo 2005, cais ob lub cev dej thiab tiv thaiv kev ntws tawm ntawm North Aral mus rau qhov siab-siab South Aral.
Yuav ua li cas los hloov cov dej ntawm Hiav Txwv Aral?
Ib txoj kev npaj tau tshaj tawm kom rov qab los ntawm North Aral Hiav Txwv los ntawm kev tsim Dike Kokaral , lub pas dej ua ke sib cais ob feem ntawm Hiav Txwv Aral. Xyoo 2004, thaj chaw hiav txwv yog 17, 160 km 2 (6, 630 sq mi), 25% ntawm nws qhov loj me, thiab ze li tsib npaug ntawm cov ntsev tau tua feem ntau ntawm nws. flora thiab fauna.
Dab tsi yog ua rau lub hiav txwv Aral?
Thaum ntxov 21st xyoo pua, Soviet Union tau hloov pauv lub hiav txwv Aral thawj qhov chaw dej tshiab, tus dej Syr Darya thiab Amu Darya, rau kev tso dej ntawm lawv cov paj rwb. Raws li qhov tshwm sim, lub hiav txwv tau poob mus rau ob lub cev dej: North Aral Hiav Txwv hauv Kazakhstan thiab South Aral Hiav Txwv hauv. Uzbekistan.
Vim li cas Hiav Txwv Aral thiaj tseem ceeb?
Dab tsi txawv ntawm Hiav Txwv Aral? Muaj ib zaug, nws yog lub pas dej loj thib plaub uas muaj nyob. Nyob rau hauv thaum ntxov 1900s, nws tau muab cov zej zog nrog ntau yam kev pab cuam ecosystem tseem ceeb. Qhov no suav nrog nuv ntses thiab kev txuag dej hauv zos thiab av fertility.
Pom zoo:
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).
Vim li cas kev sib pauv pauv hloov pauv tau zoo dua?
Ntses gills Ntses gills Cov txiaj ntsig ntawm qhov no yog tias cov ntshav ntws hauv cov hlab ntsha ib txwm ntsib cov dej uas muaj cov pa oxygen ntau dua, tso cai rau kev nthuav dav mus rau txhua txoj hauv kev ntawm lamellae. Raws li qhov tshwm sim, cov gills tuaj yeem rho tawm ntau dua 80% ntawm cov pa oxygen muaj hauv dej.
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.
