简介:《中国图书馆图书分类法》(简称《中图法》),自1975年出第一版以来,经过两次修订,已于1990年出版了第三版。它的问世是在十多年的图书馆文献分类实践的基础上,进一步加以充实、完善和提高。因此,《中图法》第三版受到了图书馆等文献工作部门的欢迎,它必将促使文献分类工作更趋于科学、准确和统一。
简介:InfluenceoftheeffectivefermionhexadecapoleforcenewlyincorporatedinamicroscopicsdgIBM-1onspectra,reducedE2andE4transitionmatrixelements(T(E2)sandT(E4)s)intheeven-evenplatinumisotopes(A=192,194,196,198)isinvestigatedintermsofnumericalcalculations.ItisfoundthattheintroducedinteractioncausesonlylimitedmodificationtothespectrumandT(E2)s,apartfromafewexceptions.However,itplaysanessentialroleindescribingE4transitions.Thusinthecasethattheinteractionisincorporatedwithcertainstrength,areasonabledescriptionofalltheE4transitionsintheplatinumisotopesisreachedinthemicroscopicsdgIBM-1incomparingbothtoexperimentaldataandtheresultscalculatedinphenomenologicalbosonmodel.``
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简介:目的:观察肺炎支原体感染患儿血清白介素-5(IL-5)和尿白三烯E4(LTE4)的水平变化.探讨IL-5和半胱氨酰白三烯(cysLTs)在肺炎支原体感染发病机制中的作用。方法:住院确诊为MP感染的患儿为MP感染组(29例),同期在门诊作正常健康体检的儿童为正常对照组(30例)。用双抗体夹心ELISA法检测两组儿童血清IL-5和尿LTEA的浓度。结果:IP感染组尿LTEA的水平显著高于正常对照组(P〈0.01);MP感染组血清IL-5的水平与正常对照组无显著性差异(P〉0.05)。MP感染患儿血清IL-5的水平和尿LTFA的水平无相关性(P〉0.05)。结论:cysLTs在MP感染的发病机制中起一定作用,IL-5可能不是MP感染的发病机制的重要因素。
简介:Anovelseriesofpyrido[1,2-e]purin-4(3H)-onederivativescontainingpolarsubstituentson5'-positionweredesignedandpreparedaspotentialPDE5inhibitors.Thispaperreportsthesyntheticroutes,1H-NMRdata,andthePDE5inhibitoryactivitiesofthetargetcompounds.Thepolarpiperazinylgroupcontained(on5'-position)compound,3B2,showedthehighestactivityamongthetestedderivativesbutlesspotencythansildenafil1.