Video: Yuav ua li cas glycosides tsim?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Glycosides . Glycosides tau tsim Thaum cov anomeric (hemiac-etal lossis hemiketal) hydroxyl pawg ntawm monosaccharide nkag mus rau qhov sib xyaw nrog hydroxyl pab pawg thib ob molecule, nrog kev tshem tawm dej. Glycosides muaj npe rau cov suab thaj uas muab cov pab pawg hemiacetal.
Ib yam nkaus, yuav ua li cas thiaj tsim tau cov nyiaj glycosidic?
Glycosidic bonds yog covalent chemical daim ntawv cog lus uas txuas lub nplhaib-zoo li cov suab thaj molecules rau lwm cov qauv. Lawv daim ntawv los ntawm cov tshuaj tiv thaiv condensation ntawm ib qho cawv los yog amine ntawm ib qho molecule thiab cov anomeric carbon ntawm cov suab thaj thiab, yog li, tej zaum yuav O-txuas los yog N-txuas.
Qhov thib ob, glycosides ua dab tsi? Plawv glycosides yog cov tshuaj kho kab mob plawv tsis ua hauj lwm thiab qee lub plawv dhia tsis xwm yeem. Lawv yog ib qho ntawm ntau hom tshuaj siv los kho lub plawv thiab lwm yam mob. Plawv cov glycosides muaj nyob hauv ntau tsob ntoo, suav nrog nplooj ntawm digitalis (foxglove) cog.
Yog li ntawd, dab tsi yog glycosides tseem ceeb?
Ob tug thawj glycosides , stevioside thiab rebaudioside A, yog siv los ua cov khoom qab zib hauv ntau lub tebchaws. Cov no cov glycosides muaj steviol li aglycone ib feem. Glucose lossis rhamnose-glucose ua ke tau khi rau qhov kawg ntawm aglycone los tsim cov sib txuas sib txawv.
Cov tshuaj reagents twg tuaj yeem ua rau glycoside hydrolysis?
Enzymes uas hydrolyse glycosidic bonds hu ua " glycoside tshuaj hydrolases" lossis "glycosidases". Hydrolysis sucrose ua rau cov piam thaj thiab fructose. Invertase yog ib qho khoom siv uas siv tau rau kev lag luam hydrolysis ntawm sucrose mus rau qhov hu ua invert qab zib.
Pom zoo:
Dab tsi yog lub npe ntawm cov khoom tsim uas yog qhov tseem ceeb rau kev pib tsim cov ntshav khov?
Thrombocytes (platelets) Megakaryocytes tsim los ntawm hemocytoblasts hauv cov pob txha liab. Thrombocytes dhau los ua nplaum thiab sib sau ua ke los ua cov platelet ntsaws uas kaw qhov tawg thiab kua muag hauv cov hlab ntshav. Lawv kuj pib tsim cov ntshav txhaws
Nyob rau theem dab tsi ntawm kev tsim cov kab mob fungal yog diploid cells tsim?
Hauv lub neej voj voog ntawm kev sib deev kis tus kab mob hu ua fungus, theem haploid hloov nrog qib diploid. The haploid theem xaus nrog nuclear fusion, thiab theem diploid pib nrog kev tsim zygote (diploid cell ua los ntawm fusion ntawm ob haploid cells)
Cov kab mob hauv qhov ncauj dab tsi metabolize sucrose tsim cov nplaum glucans thiab tsim cov quav hniav?
GTF yog qhov tseem ceeb enzyme uas catalyzes sucrose rau nplaum glucans thiab pab txhawb kev tsim cov hniav plaque nyob rau hauv uas lub tsub zuj zuj ntawm metabolic acids uas ua los ntawm cov kab mob colonies ua rau lub zos demineralization ntawm cov enamel nto (Loesche, 1986)
Koj yuav ntsuas glycosides li cas?
Kedde xeem: Ib qho kev daws ntawm glycosides yog kho nrog ib qho me me ntawm Kedde reagent (Sib tov sib npaug ntawm 2% tov ntawm 3, 5 dinitrobenzoic acid hauv menthol thiab 7.5% aqueous tov ntawm KOH). Kev loj hlob ntawm cov xim xiav lossis violet uas ploj hauv l mus rau 2 teev qhia tias nws muaj cardinoloids
Cov cim lossis cov tsos mob twg yuav qhia peb tias tus neeg raug tsim txom yuav tsum tau ua pa cawm?
Nov yog ob peb ntawm Cov Cim Ceeb Toom CPR Tej zaum Yuav Tsum Tau: Sudden Collapse: Tshawb nrhiav ua pa thiab mem tes. Tsis nco qab: Sim tsa tus neeg. Teeb meem ua pa: Tsis ua pa lossis ua pa tsawg tuaj yeem hu rau CPR. Tsis muaj Pulse: Yog tias tsis muaj mem tes, lub plawv yuav nres