2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Thaum lub qhov muag raug teeb, 11-cis-retinal tivthaiv ntawm rhodopsin hloov mus rau all-trans-retinal, ua rau muaj kev hloov pauv tseem ceeb hauv kev teeb tsa ntawm rhodopsin molecule. … Qhov kev hloov pauv hauv kev teeb tsa kuj ua rau opsin cuam tshuam los ntawm cov retinal, ua rau bleaching.
Pob lub teeb qhib rhodopsin?
Thaum lub teeb tawm tsam rhodopsin, G-protein transducin tau qhib, uas tig mus activates phosphodiesterase. Phosphodiesterase converts cGMP rau GMP, yog li kaw sodium raws. Raws li qhov tshwm sim, daim nyias nyias ua hyperpolarized.
Puas rhodopsin tawg los ntawm lub teeb?
Qhov no yog vim li cas nws tseem ceeb heev kom nyob deb ntawm lub teeb ci ib zaug koj tau tsim koj lub zeem muag hmo ntuj vim tias cov protein no tsis tshua muaj siab rau lub teeb ci. Thaum rhodopsin raug rau lub teeb ci, nws tam sim photobleaches thiab tawg- rhodopsin splits rov qab rau hauv retinal thiab opsin molecules.
Dab tsi ua ke los ua rhodopsin?
Rhodopsin muaj ob yam, ib qho protein molecule tseem hu ua scotopsin thiab covalently-bound cofactor hu ua retinal. Scotopsin yog ib qho opsin, lub teeb-sensitive G protein txuas nrog receptor uas embeds hauv lipid bilayer ntawm cell membranes siv xya protein transmembrane domains.
Thaum lub teeb tawm tsam rhodopsin retinal hloov nws cov duab los ntawm?
Thaum lub teeb tawm tsam rhodopsin,retinal hloov nws cov duab los ntawm trans rau cis.
Pom zoo:
Cov ntaub ntawv qhia ntawv puas txhawb nqa cov ntaub ntawv kawm?
Cov ntaub ntawv qhia yuav tsum txhawb nqa txoj kev kawm lub tswv yim, cov hom phiaj thiab cov hom phiaj ntawm Cheeb Tsamthiab cov hom phiaj ntawm cov ntaub ntawv kawm uas cov ntaub ntawv yuav raug siv. … Cov ntaub ntawv qhia yuav tsum ua tau raws li cov qauv zoo ntawm cov ntsiab lus tseeb thiab kev nthuav qhia.
Nyob rau hauv cov ntaub ntawv hierarchical qauv raug teeb tsa li?
Ib tus qauv hierarchical database yog cov qauv ntaub ntawv uas cov ntaub ntawv tau teeb tsa rau ib tsob ntoo zoo li qauv. Cov ntaub ntawv raug muab khaws cia ua cov ntaub ntawv uas txuas rau ib leeg los ntawm kev sib txuas. Cov ntaub ntawv yog ib phau ntawm cov teb, nrog rau txhua daim teb tsuas muaj ib qho nqi xwb.
Thaum cov ntaub ntawv tshiab cuam tshuam nrog kev muab cov ntaub ntawv qub no hu ua?
Nrog retroactive cuam tshuam, cov ntaub ntawv tshiab cuam tshuam lub peev xwm rov qab cov ntaub ntawv qub. Nrog kev cuam tshuam tsis zoo, nws yog qhov rov qab: cov ntaub ntawv qub cuam tshuam qhov rov qab los ntawm cov ntaub ntawv tshiab tau kawm.
Puas yog cov ntaub ntawv sib tw cov ntaub ntawv raug cai?
Kev tsim "Cov ntaub ntawv cog lus" yog cov ntaub ntawv sau uas txhais lub luag haujlwm, kev lav phib xaub, thiab "Ua haujlwm" raws li Daim Ntawv Cog Lus Tsim Kho, thiab raug cai lij choj rau ob tog (Tswj thiab tus neeg cog lus).
Cov ntaub ntawv twg muaj cov ntaub ntawv bituminous?
Nws muaj ob chav kawm ntawm cov khoom siv bituminous: (1) asph alt; thiab (2) tar. Cov ntaub ntawv no feem ntau yog siv los ua dej-pov thawj sealants, thiab ua cov ntaub ntawv los tuav cov aggregate ua ke nyob rau hauv bituminous pavements. Dab tsi yog cov khoom siv bituminous?
