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1.
1IntreductionTheliteratUreonmulti-Criteriondecisionmaking(MCDM)problemshas~tremendouslyintherecentpast.TwomajorareashaveevolvedwhiChbothconcentrateondecisionmakingwithseveralcriteria:multiobjectivedecisionmaking(MODM)andmulti-attributedecisionmaking(MADM).TheformerconcentratesoncontinuousdecisionspaceandthelatterfocusesonproblemswithdiscreteSPace.FuzzysettheoryhascontributedtoMODMproblemsaswellastheMADMProblems.ThegeneralMODMproblemcanbedeft.edLllasfollows:Twostagescangenerallybe…  相似文献   
2.
对川西汉源-荥经地区CYD2井下奥陶统弗洛阶大乘寺组的笔石进行研究,结果表明Baltograptus deflexus笔石带在这一覆盖区发育良好。CYD2井的该带笔石动物群共含2属5种。根据下垂对笔石类的始端发育型式,修正前人对波罗的笔石属(Baltograptus)和巅峰笔石属(Corymbograptus)内一些种的归属,并对CYD2井的5种笔石进行描述。可能受制于钻心标本的限制,该地区的Baltograptus deflexus带笔石动物群分异度较低。川西汉源-荥经-峨眉山地区的大乘寺组与上覆二叠系梁山组呈假整合接触,表明该地区长期遭受沉积间断和剥蚀作用,B.deflexus带的确定,指示了这一长期剥蚀作用的最大深度。  相似文献   
3.
Rice (Oryza sativa L.) is a major crop in the world and provides the staple food for over half of the world's population. From thousands of years of cultivation and breeding to recent genomics, rice has been the focus of agriculture and plant research.  相似文献   
4.
冯博  李育阳 《遗传》1989,11(3):41-42
分离与回收DNA片段是基因操作的重要环节之一。本文介绍了一个用透析膜从琼脂糖胶中回收 DNA 片段的改进方法。利用本法回收DNA片段洗脱容易、节约时间、回收率在80% 左右。回收的 DNA片段可用于酶切反应、连接反应和用缺口位移反应制备32p标记DNA探针。  相似文献   
5.
1IntroductionForaphysicssyStem,onemayonlyobtainapieceOfiofo~ionabbotitSd~edPaces.In~cases,oneorat~SeveralvariableSoftheSyStemismeaSUledasthesyStemevolvesinaclodoftime.ExamplesarethemeaSuredtetnperatUle,blabsP~ofahumanthey;concentrationsof~entsinachendcalreaction,componentsofthevelvetyOfthefluidincertaindirectionSandthefluctuationOfthePriceinasacmarket.AllthesemeasureddatapresentasatIme~esxl,xZ,'.,xj,inwhichthesuhiindexpreSentSthetimeSampledregUlarlybyatimenitedr.Thequestionhereishow…  相似文献   
6.
INTRODUCTI0NThedifferentiati0nofcelIsalongthemonocyte-macr0phagepathwayandthesig-nalsinvo1vedinthesecel1sacquiringtheabilitytokilltum0rcellsarenotfllllyundersto0d.Wehavebeenstudingamoleculewhichappearst0beanimportantmemberofthecytokinenetworkinvo1vedintheregulati0nmonocyteactivation.ThiscytokinetermedP48wasisolatedfr0mthehllmannullcellleukemiacell1ineReh.IthasbeenpurifiedtohomogeneityandfOundtobedistinctfrominterferongamma,col0nystimulatingfactors(CSFs)andTNFalphaalldbeta[1,2].Func-ti…  相似文献   
7.
INTRODUCTIONPlantshavedevelopedseveralbi0chemicaldefensemechanismsinresp0nsetopath0gensandabioticstress.Fo1l0wingpathogenattack,plantsynthesizephenyl-propaniodpr0ductssuchaslignin,l0wm0l.wt.antimicrobia1comp0undsknownasphyt0alexins,andseveraldefense-relatedproteins.Amongthesepr0teinsare"pathogenesis-relatedproteins"includingthefungalcellwalldegradingenzymeschitinaseandP-1,3-glucanase[1].Endochitinasefromhigherplantscatalyzethehydr0lysis0fchitin,aP-1,4-linkedhomop0lymerofN-acetyl-D-glucos…  相似文献   
8.
Hepatitis B virus(HBV) infection is a severe health problem in the world. However, there is still not a satisfactory therapeutic strategy for the HBV infection. To search for new anti-HBV agents with higher efficacy and less side-effects, the inhibitory activities of traditional Chinese medicine Rheum palmatum L. ethanol extract(RPE) against HBV replication were investigated in this study. Quantitative real-time polymerase chain reaction(PCR) was employed to analyze the inhibitory activity of RPE against HBV-DNA replication in a stable HBV-producing cell line HepAD38; the expression levels of HBV surface antigen(HBsAg) and e antigen(HBeAg) were also determined by enzyme linked immunosorbent assay(ELISA) after RPE treatment. RPE could dose-dependently inhibit the production of HBV-DNA and HBsAg. The concentration of 50% inhibition(IC50) was calculated at 209.63, 252.53μg/mL, respectively. However, its inhibitory activity against HBeAg expression was slight even at high concentrations. RPE had a weak cytotoxic effect on HepAD38 cells(CC50 = 1 640μg/mL) and the selectivity index(SI) was calculated at 7.82. Compared with two anthraquinone derivatives emodin and rhein, RPE showed higher ability of anti-HBV and weaker cytotoxicity. So Rheum palmatum L. might possess other functional agents which could effectively inhibit HBV-DNA replication and HBsAg expression. Further purification of the active agents, identification and modification of their structures to improve the efficacy and decrease the cytotoxicity are required.  相似文献   
9.
INTRODUCTIONAsaderivativeofvitaminA,RAcaninhibittheproliferati0nofmanymalignantcel1sallde1icitdifferentiationinsometumorce1lsI1-5].RecentstudieshaveshownthatRAmodu1atessynthesisofover4Oproteinsthroughitsnucleicrecept0r[6].Forinstance,RAinducesthesynthesis0ffibronectin(FN)incertaintumorcellsandactivatesthegenecodingfOrB1sllbunitoflaminin(LN)causingitsexpressi0n[7,8].FNandLN'areknownt0bethemostimportantcomponentsofnon-c0llageng1ycoproteinsintheextracellu1armatrixandareclose1yrelatedt…  相似文献   
10.
INTR0DUCTIONLymphotoxin(LT),alsocalledtum0rnecrosisfactord(TNF-P),isalymphokinereleasedbymit0genorantigen-activatedTlymphocytes.Undercircumstancesofvariousneoplastandautoimmunediseases,LTpr0ducti0ncanals0bedetectedre-spectively,contributingtothecytotoxici…  相似文献   
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