2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Background. Enzymatic browning cuam tshuam ntau ntau cov kab mob hauv nruab nrog cev thiab cov nqaij nruab deg uas yog nplua nuj nyob rau hauv oxidizable phenols xws li txiv hmab txiv ntoo, zaub, nroj tsuag muaj ntxhiab, fungi, thiab cw. Nws tshwm sim thaum muaj ntau yam txheej txheem siv hauv kev lag luam khoom noj khoom haus: sib sib zog nqus khov, dehydrofreezing, khov-drying, kub-cua ziab, thiab lwm yam.
Peb pom qhov twg muaj cov enzymic browning?
Enzymic browning yog cov tshuaj tiv thaiv oxidation uas tshwm sim hauv qee cov zaub mov, feem ntau yog txiv hmab txiv ntoo thiab zaub, ua rau cov zaub mov tig xim av. Oxidation tshwm sim hauv cov khoom noj thiab cov khoom tsis yog khoom noj.
Qhov twg ntawm cov no yog piv txwv ntawm enzymatic browning?
Enzymatic browning tuaj yeem pom hauv cov txiv hmab txiv ntoo (apricots, pears, bananas, grapes), zaub (qos, nceb, lettuce) thiab kuj nyob rau hauv cov nqaij nruab deg (cws, spiny lobsters thiab roob ris). Enzymatic browning yog kev puas tsuaj rau qhov zoo, tshwj xeeb tshaj yog tom qab sau qoob loo ntawm cov txiv hmab txiv ntoo tshiab, kua txiv hmab txiv ntoo thiab qee cov plhaub ntses.
Vim li cas enzymatic browning tseem ceeb?
Enzymatic browning yog ib qho kev cuam tshuam tseem ceeb tshaj plaws uas tshwm sim hauv cov txiv hmab txiv ntoo thiab zaub, feem ntau ua rau muaj qhov tsis zoo rau xim, saj, tsw, thiab khoom noj muaj txiaj ntsig. Cov tshuaj tiv thaiv yog qhov tshwm sim ntawm phenolic tebchaw 'oxidation los ntawm polyphenol oxidase (PPO), uas ua rau tsim cov xim tsaus nti.
Y Yuav ua li cas enzyme yog lub luag haujlwm rau enzymatic browning?
Lub luag haujlwm rau lubbrowning yog hu ua polyphenol oxidase (los yog PPO). Nyob rau hauv lub xub ntiag ntawm oxygen PPO enzyme hloov tshuaj hu ua phenolic compounds (los ntawm ib tug txheej txheem ntawm oxidation) mus rau hauv sib txawv tebchaw hu ua quinones.
Pom zoo:
Yuav ua li cas txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau pom kev pom?
Txawm li cas los xij, corneal collagen cross-linking - cov txheej txheem qib siab tau pom zoo los ntawm US Food and Drug Administration (FDA) hauv xyoo 2016 - tuaj yeem txhim kho qhov pom kev hauv cov neeg mob txhua hnub nyoog. Corneal collagen cross-linking (CXL) tsis yog kho rau keratoconus, tab sis nws tuaj yeem pab tiv thaiv tus mob kom tsis txhob mob hnyav.
Ntawm qhov capillaries pom nyob rau hauv lub cev nyob qhov twg?
Nruam: Cov capillaries no tsis muaj perforations thiab cia tsuas yog me me molecules dhau mus. Lawv tam sim no hauv nqaij, tawv nqaij, rog, thiab paj hlwb. Fenestrated: Cov capillaries no muaj cov pores me me uas tso cai rau cov molecules me los ntawm thiab nyob hauv cov hnyuv, ob lub raum, thiab cov qog endocrine.
Nyob rau hauv kev ua kom lub cev tsis muaj zog uas tsis muaj qhov xav tau?
Nyob hauv cov txheej txheem kev kawm hu ua classical conditioning, unconditioned stimulus (UCS) is one uas unconditionally, lawm, thiab cia li ua rau teb. Hauv lwm lo lus, cov lus teb tshwm sim yam tsis muaj kev kawm ua ntej. Qhov kev xav tau thiab tsis muaj kev cia siab yog dab tsi?
Lub cev muaj zog twg feem ntau nyiam rau lub elevator niaj hnub no?
AC lub nplhaib lossis DC compound motors yog nyiam rau nqa. Shunt hom commutator motors yog nyiam nyob rau hauv cov ntaub ntawv ntawm ib theem installation. Cov qauv nqa nqa zaum kawg siv 3-theem induction motors nrog kev sib txawv zaus tsav hluav taws xob tswj.
Vim li cas qhov tseem ceeb ntawm qhov muaj zog thiab qhov tsis muaj zog yog qhov tseem ceeb?
Nws yog ib qho tseem ceeb rau qhov tseem ceeb ntawm qhov ua tau zoo thiab qhov tsis muaj zog vim qhov no pab lub tuam txhab txiav txim siab txog thaj chaw uas lawv yuav tsum tau txhim kho ntxiv rau thaj chaw uas lawv ua tau zoo hauv. Vim li cas lub zog thiab qhov tsis muaj zog tseem ceeb?
