简介：

简介：

简介：

简介：底价拍卖是在传统的拍卖理论的热研究问题之一。这里，我们在联机拍卖学习开始的价格，在传统的拍卖的公共底价的对应物。由认为象eBay一样的三个特征联机，投标人(到泊松过程的题目)的auctions:stochastic入口，与开始的价格成正比的插入费用，和时间打折，我们为最大化分析了开始的价格的极值点的性质卖主期望了收入，并且发现了那，在某些条件下面，最佳的开始价格应该在最低许可的水平，它与从经典拍卖理论的结果相反并且事实上发现它的optimality。我们也开发了多级式的拍卖的一个一般扩大模型并且在它的性质上执行了分析。最后，为进一步的研究的一些方向也被提出。

简介：<正>Lastyear,1998,wasanextraordinaryyear.Inthefaceoffinancialtur-moilinternationallyandrecord--breakingfloodsdomestically,wehavestoodseveretests.Themacroeconomiccontrolpolicyadoptedbythecen-tralauthoritiestoexpandinvestmentinordertoprovideincentivestodo-mesticdemandyieldedpositiveresultsandtheeconomicgrowthratereached7.8percent.Howevertheinvestmentexpansionwasonlythebe-

简介：GABAtransporter1(GAT1)takesimportantrolesinmultiplephysiologicalprocessesthroughtheuptakeandreleaseofGABA,buttheregulationofGAT1geneexpressionindifferenttissuesisrarelyknown.Toaddressthequestion,first,5'RapidamplificationofcDNAend(RACE)wasusedtodetermineGAT1transcriptionalstartingsitesinneonatalmousecerebralcortexandintestine,adultmousebrainandadultrattestis.Theproductsof5'RACEwereconfirmedbyDNAsequencing.WefoundthatthetranscriptofGAT1inneonatalmousecerebralcortexandadultmousebrainstartsatthesamesite(insideofexon1),whileinmouseintestine,GAT1startstranscriptioninintron1,andinrattestis,thetranscriptofGAT1hasanadditionaluntranslationexontothe5'direction.

简介：Aseriesofbenzo-fusedheteroaromaticcompoundswith5-,6-and7-memberedtings,suchasbenzimidazole,quinoxalineand1H-1,5-benzodiazepinederivatives,weresynthesizedthroughcondensationreactionofo-pheny1-enediaminewithary1aldehydesorketones.Theexperimentalconditionswerecarefullyexamined,andtheproductswerecharacterizedby^1HNMR,^13CNMR,MS,IRandelementalanalyses.Inaddition,thestructureofabenzodiazaepinederivativewith7-memberedringwasconfirmedbysinglecrystalX-raydiffractionanalysis.