Cov txheej txheem:
- Dab tsi ntawm vinca yog tshuaj?
- Koj rho tawm vinca alkaloids li cas?
- Hom alkaloids muaj nyob hauv vinca dab tsi?
- Puas yog vincristine tseem siv?
Video: Qhov twg hauv qab no yog cov tshuaj lom neeg ntawm vinca?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Cov tshuaj lom neeg: Vinca muaj indole alkaloids ntau, feem ntau yog vincristine thiab vinblastine. Vinca kuj muaj lwm cov alkaloids xws li ajmalicine, serpentine thiab lochnerine ua cov tshuaj lom neeg.
Dab tsi ntawm vinca yog tshuaj?
Vinca alkaloids yog ib pawg ntawm cov tshuaj tau los ntawm Madagascar periwinkle cog. Lawv tau muab rho tawm los ntawm cov paj liab periwinkle, Catharanthus roseus G. Don thiab muaj cov nyhuv hypoglycemic nrog rau cov teebmeem cytotoxic.
Koj rho tawm vinca alkaloids li cas?
Cov alkaloids (120 gm) yog yaj hauv 400 ml ntawm chloroform thiab muab rho tawm nrog pH 3 phosphate tsis (ib litre). Cov txheej chloroform yog qhuav dhau los ntawm cov dej tsis muaj dej Na2SO4, lim thiab concentrated hauv lub tshuab nqus tsev kom them taus 60 grams ntawm alkaloidal sib tov. Qhov no yog yaj hauv 240 ml ntawm chloroform.
Hom alkaloids muaj nyob hauv vinca dab tsi?
Vinca alkaloids yog qhov paub zoo ntawm cov tshuaj tau los ntawm Madagascar periwinkle (Catharanthus roseus). Plaub qhov loj vinca alkaloids siv nyob rau hauv ntau yam kev kho mob qog noj ntshav yog vinblastine, vincristine (los yog semisynthetic derivatives), vindesine, thiab vinorelbine(Fig. S1A).
Puas yog vincristine tseem siv?
“Tam sim no tau siv ntau ntawm peb kho mob qog noj ntshav rau menyuam yaus, los ntawm peb hom mob qog noj ntshav feem ntau, mob qog ntshav qog ntshav qog ntshav, mus rau lymphomas, suav nrog Hodgkin thiab non-Hodgkin lymphoma.,”nws hais. Nws kuj tau siv rau ntau cov qog nqaij hlav, nrog rau cov qog hlwb, Wilms qog thiab neuroblastoma.
Pom zoo:
Puas yog ib qho tseem ceeb ntawm cov tshuaj lom neeg lom neeg ntawm thiols?
Dab tsi ntawm cov hauv qab no yog qhov tseem ceeb ntawm cov tshuaj lom neeg lom neeg ntawm thiols? kev oxidation ntawm ob thiols los ua ib tug disulfide . Yam thiols yog dab tsi? 1 BIOLOGICAL THIOLS Thiols xa mus rau chav kawm ntawm cov organic sulfur derivatives uas yog tus cwj pwm los ntawm qhov muaj sulfhydryl residues (–SH) ntawm lawv qhov chaw nquagTshuaj, thiols yog mercaptans (C-SH) thiab biological mercaptans feem ntau hu ua biological thiols lossis biothio
Qhov twg ntawm cov tshuaj tiv thaiv hauv qab no tau piav qhia los ntawm kossel thiab cov nkauj?
Qhov twg ntawm cov tshuaj lom neeg hauv qab no tau piav qhia los ntawm Kossel thiab Lewis? Nqe lus piav qhia: Ob qho Ionic thiab Covalent daim ntawv cog lustshwm sim los ntawm kev nyiam ntawm atoms kom muaj kev ruaj ntseg ntawm electrons. … Piav qhia:
Dab tsi ntawm cov hauv qab no yog qhov dav dav ntawm kev sib cuam tshuam ntawm cov nroj tsuag-pollinator?
Teb yog A. Tight one to one co-evolutionary partnership. Cog pollinator kev sib cuam tshuam tau pab ob qho tib si pollinator thiab cov nroj tsuag hloov kho lawv lub cev yam ntxwv kom lawv tuaj yeem cuam tshuam tau zoo los txhawb kev tshwj xeeb ntawm lawv cov kev sib cuam tshuam .
Qhov twg ntawm cov kab ke hauv qab no yog siv los ua cov thauj tog rau nkoj tom qab kev nruj?
Kev piav qhia: Lub Freyssinet anchorage system yog siv dav hauv Tebchaws Europe thiab Is Nrias teb muaj lub tog raj kheej nrog lub conical sab hauv los ntawm qhov siab tensile xov hlau hla thiab tawm tsam cov phab ntsa uas xov hlau yog wedged los ntawm ib tug conical plug lined longitudinally nrog grooves rau tsev cov xov hlau .
Qhov twg ntawm cov kuab tshuaj hauv qab no yog siv rau hauv kev sib txuas ntawm chlorofluorocarbon?
Dichloromethane yog ntau yam kev lag luam hnyav. Tus kws tshawb fawb Belgian Frédéric Swarts pioneer lub synthesis ntawm CFCs nyob rau hauv 1890s . CFCs ua li cas? CFCs thiab HCFCs feem ntau yog tsim los ntawm kev sib pauv halogen pib los ntawm chlorinated methanes thiab ethanesCov derivatives brominated yog tsim los ntawm cov tshuaj dawb-radical ntawm chlorofluorocarbons, hloov C-H daim ntawv cog lus nrog C- Br daim ntawv cog lus.
