HPLCGradeAcetoneProductDescription
CovaChem"sHPLCGradeAcetoneisahighpuritysolvent(>99.9%),ideallysuitedforHPLCapplicationsandgenerallaboratoryuse.Covachem"sHPLCGradeAcetoneis0.2micronfiltered,andalsoexceedsallACSspecifications.
PackageSizes:1Liter,4Litersand4x4LitersProductNumbers:16304-1,16304-4,16304-4x4
ProductName:HPLCGradeAcetone
AlternativeNames:HPLCAcetone;HPLCGradeAcetone;HPLC2-Propanone;AcetoneforHPLC
Specifications
Appearance:Clear,ColorlessLiquid
Purity(GC):≥99.9%
SolubilityinWater:ToPassTest
LCGrADIentStABIlityTest(254nm):Topasstest
Densityat25°C:0.7857g/mLmax
Residueafterevaporation:10ppmmax
Aldehyde(asHCHO):0.002%max
Absorbanceat:400nm......0.01max350nm......0.02max340nm......0.10max330nm......1.00maxRecommendedStorage:RoomTemperature,protectedfromexcesslight
Properties
PropertiesPhysicalState:Liquid
MeltingPoint:-94°C(lit.)
BoilingPoint:56°Cat760mmHg(lit.)
CAS#:67-64-1
ChemicalFormula:C3H6O
MolecularWeight:58.08
CountryofOrigin:USA
TariffCode:2914.11.1000
UNTransportationCode:1090
ImportantNotes:
(1)$25Hazardoustransportationchargefordomesticshipmentsisincludedinthepricelistedonline.
(2)Duetotheweightandhazardsassociatedwiththisproduct,notallshippingoptionsareavailableforthisproduct.Afterreceiptoforder,acustomerservicerepresentativemaycontactyoutomodifyshippingoption.
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第一类激素作用在靶细胞表面,并不进入细胞内部,而是与细胞膜表面特异的受体结合.这种结合使腺苷酸环化酶激活产生cAMP(一种第二信使),cAMP再去激活细胞内的一些特定系列的酶,从而引起各种生理效应.这是由E.W.Sutherland于1965年提出来的第二信使假说
第二类激素由于是脂溶性的小分子.能直接进入靶细胞,与靶细胞的细胞质中的受体分子结合成"激素-受体复合物",在一定条件下穿过核膜进入核内,与染色质上的一种酸性蛋白质相互作用,促进DNA样板转录相应的mRNA.
mRNA扩散出核膜进入细胞质,导致某种蛋白质(酶)的合成,从而引起这种激素的生理效应.
B、是重要的储能物质,磷脂为构成生物膜的重要成分,固醇为动物细胞膜的构成物质及形成激素等,B错误;
C、蛋白质是细胞代谢的主要结构物质,糖类是细胞代谢的主要能源物质C错误;
D、ATP的结构简式是 A-P~P~P,其中A代表腺苷,腺苷是构成ATP的重要部分,D正确.
故选:D.
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