Puas yog cov roj cholesterol ua kom cov kua dej ua kua dej?

Cov txheej txheem:

Puas yog cov roj cholesterol ua kom cov kua dej ua kua dej?
Puas yog cov roj cholesterol ua kom cov kua dej ua kua dej?
Anonim

Thaum qhov kub thiab txias, cov roj cholesterol ua rau cov kua dej ua kom cov kua dej ntau dualos ntawm kev tiv thaiv cov lipids los ntawm kev ntim khoom sib ze. Thaum qhov kub thiab txias, cov roj (cholesterol) yuav txo qis hauv daim nyias nyias.

Puas cov roj (cholesterol) ua kom cov kua dej ntau dua lossis tsawg dua?

Nyob ntawm qhov kub thiab txias, cov roj (cholesterol) muaj qhov cuam tshuam sib txawv ntawm daim nyias nyias. Thaum qhov kub thiab txias, cov roj (cholesterol) cuam tshuam nrog kev txav ntawm cov phospholipid fatty acid chains, ua rau sab nrauv ntawm cov kua dej tsawg thiab txo nws cov permeability rau me me molecules.

YPuas cov roj (cholesterol) nce cov membrane permeability?

Lub luag haujlwm ntawm cov roj (cholesterol) hauv bilayer thiab monolayer lipid daim nyias nyias tau muaj txiaj ntsig zoo. Nyob rau hauv lub biophysical pem hauv ntej, cov roj cholesterol tau nce qhov kev txiav txim ntawm cov lipid packing, lowers cov membrane permeability, thiab tswj cov kua dej los ntawm kev tsim cov kua-qib-theem lipid rafts.

Vim li cas cov roj (cholesterol) qis dua membrane permeability?

Cov roj (cholesterol) cuam tshuam nrog cov fatty acid tails ntawm phospholipids kom nruab nrab cov khoom ntawm daim nyias nyias: Cov roj (cholesterol) ua haujlwm rau immobilize sab nrauv ntawm daim nyias nyias, txo cov fluidity. Nws ua rau cov membrane tsawg permeable rau me me dej-soluble molecules uas yuav txwv tsis pub hla.

Kev sib raug zoo ntawm cov roj (cholesterol) thiab daim nyias nyias yog dab tsi?

Cov roj (cholesterol) uaRaws li ib tug bidirectional regulator ntawm membrane fluidity vim hais tias ntawm qhov kub thiab txias,nws stabilizes daim nyias nyias thiab tsa nws melting point, whereas nyob rau hauv qis kub nws intercalates ntawm phospholipids thiab tiv thaiv lawv los ntawm clustering ua ke thiab stiffening.

Pom zoo:

Nthuav cov khoom
Vim li cas cov neeg caij dav hlau yog poj niam?
Nyeem ntxiv

Vim li cas cov neeg caij dav hlau yog poj niam?

Nws yog los ntawm lub sijhawm no uas lub luag haujlwm ntawm tus neeg saib xyuas lub dav hlau pib hloov zuj zus txhawm rau txhawm rau suav nrog kev saib xyuas ntau dua. Raws li qhov tshwm sim, dav hlau tau saib cov poj niam kws saib xyuas neeg mob los saib xyuas cov neeg caij tsheb hauv tsev.

Yog amorphous solids nkig?
Nyeem ntxiv

Yog amorphous solids nkig?

Amorphous khoom, ib yam noncrystalline solid nyob rau hauv uas atoms thiab molecules tsis koom nyob rau hauv ib tug meej lattice qauv. Cov khoom siv xws li iav, yas, thiab gel. Khoom thiab kua yog ob hom condensed teeb meem; ob leeg yog tsim los ntawm atoms nyob ze rau ib leeg.

Cov txuas hniav disulfide ua li cas?
Nyeem ntxiv

Cov txuas hniav disulfide ua li cas?

Disulfide daim ntawv cog lus koom nrog cov tshuaj tiv thaiv ntawm sulfhydryl (SH) sab chains ntawm ob cysteine residues: ib qho S - anion los ntawm ib pawg sulfhydryl ua raws li ib tug nucleophile , tawm tsam sab ntawm cov cysteine thib ob los tsim ib daim ntawv cog lus disulfide, thiab hauv cov txheej txheem tso tawm electrons (txo qhov sib npaug) hloov mus.