产品说明
p.chemkody:after{ content:""; display:block; overflow:hidden; clear:both; height:0; } p.chemkody span:nth-of-type(7n+1) { clear: left; } p.chemkody span { float: left; min-width: 90px; margin: 0 20px 0 0; padding: 0 0 10px; color: #6e6e6e; font-family: Courier New,monospace; white-space: nowrap; }Regulatorystatus:RUOResearchtopicBoneandcartilagemetabolismSummaryVitaminDismainlysynthesizedintheskinfrom7-dehydrocholesterolandispartiallyfromdietaryandsupplementationorigin.Intheliver,VitaminDishydroxylatedoncarbon25 toproducetheintermediate25OHVitaminD.25OHVitaminDisfurthermetabolizedbeforeitcancarryoutthefunctionsofVitaminDonintestine,kidneys,boneandotherorgansandtissues.Thissubsequentreactiontakesplaceinthekidneysandinothertissues.Thus25OHVitaminDisfurtherhydroxylatedinthe1α-positiontoproduce1α,25-dihydroxyvitaminD(1,25(OH)2VitaminD).Inadditiontotheabove-mentionedtissues,placentaofpregnantwomenandmacrophagecellsincaseofsarcoidiscanalsoproducesomeamountof1,25(OH)2VitaminD.1,25(OH)2VitaminDistheactiveformofVitaminDwithregardtotheknownfunctionswhereas25OHVitaminDandVitaminDitselfcanbeexcludedasbeingphysiologicallyfunctional.1,25(OH)2VitaminDstimulatestheintestinalabsorptionofbothcalciumandphosphorus.Italsostimulatesboneresorptionandmineralizationtherebypreventingthedevelopmentofricketsandosteomalacia.1,25(OH)2VitaminDisalsobeactiveinothertissuesresponsIBLeforCalciumtransport(placenta,kidney,mammarygland,…)andendocrineglandssuchasparathyroidglands.1,25(OH)2VitaminDisrapidlymetabolizedanditshalflifeisapproximately12hinplasma.Itsmainmetaboliteiscalcitroicacid,aC-23 carboxylicderivative,essentiallywithoutanyBIOLOGicalactivity.Inadditiontothispathway,1,25(OH)2VitaminDundergoes24-hydroxylationtoproduce1,24,25-trihydroxyvitaminD.Thiscompoundhaslessbiologicalactivitythanitsparentandthismetabolicrouteisconsideredasaminorpathway.Thelevelsof1,25(OH)2VitaminDinplasmaorserumis100 to1000 lessthanthatof25OHVitaminD.Duetoitslowconcentrationsandthepresenceofmanysimilarmetabolites,themeasurementof1,25(OH)2VitaminDrequiresextractionandseparationbychromatography.
miREIA是一种基于免疫测定的新型miRNA定量方法,涉及从患者样品中分离出的miRNA与互补的生物素化DNA寡核苷酸探针杂交。然后通过固定有完美匹配的DNA / miRNA杂交体的微量滴定板固定的单克隆抗体捕获DNA / RNA杂交体。下一步是复制标准ELISA方案。
该测定可在常规免疫测定设备上运行,与标准临床工作流程兼容,不需要扩增步骤,并且包括miRNA分析在内的结果可在不到三个小时的时间内获得。
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