简介:代数课本中指出:“在a>0时,|x|>a(?)x<-a或x>a;|x|0”。其实,这一等价性在a≤0时也同样成立。现证明如下:①当a=0吋,i|x|>a即|x|>0的解集显然是:x<0或x>0即x<-a或x>a。
简介:Aim:Tostudytheeffectofprothymosinα(ProTα)asafusionproteinonthesecetionofINF-γ,IFN-αandTNF-αinvitro.Methods:Theinvitrostudywascarriedoutontheculturedofsplenocytes,splenicandperitonealmacrophagesisolatedfromBalb/cmice.SplenocyteswereincubatedwithvariousconcentrationsofProTα(1×10^-7-1×10^-10mol·L^-1)withorwithoutConA(5μg·mL^-1)for72h.SplenicandperitoealmacrophageswererespectivelytreatedwithProTα(1×10^-7-1×10^-10mol.L^-1)inthepresenceofLPS(10μg·mL^-1)for24h.ThenINF-γ′s,INF-α′sandTNF-α′slevelsinthesupernatantweredetecedbyELISA,Results:ProTα(1×10^-7)mol.L^-1)wasfoundtoobviouslyincreaseINF-γlevel(P<0.05)inthesupernatantofsplenocytescomparedwiththecontrolgroup.Moreover,ProTα(1×10^-7mol.L^-1)significantlyinducedthesecretionofINF-α(P<0.01)andTNF-α(P<0.01)insplenicandperitonealmacrophages.Conchusion:Invitro,ProTαcouldincreasethesecretionofIFN-γ,IFN-αandTNF-α.