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1.
Untilnow,allmachiningmethodsusedarephysicalorchemicalorphysicochemical.Thetechnologysystemofnaturalsciencecanbeclassifiedintothefollowingthreesubsidiarysystems:physics,chemistryandbiology.Thereforeabiologicalmachiningtechnologywillbeabrandnewbranchinma…  相似文献   

2.
Breeding technology of alloplasmic wheat   总被引:4,自引:0,他引:4  
Thenucleiofcultivatedwheatcouldbetransferredintocytoplasmofheterogenicspeciesorgeneraviasubstitutionbackcrossandothertechniques,thusTriticinaeexhibitswidegeneticdiversityofcytoplasm.Thisdiversityhadboththeoreticandbreedingvalueandcouldbeusedinalloplas…  相似文献   

3.
Apoptosisorprogrammedcelldeath(PCD)isaprocessofcelldeletionwhichoccursinresponsetoanumberofcytotoxicandphysiologicallyrelevantstimuli.Thisprocessischaracterizedbyseveralearlymorphologicalterationsincludingplasmaandnuclearmembraneblebbing.Endogenousendo…  相似文献   

4.
Receptor,theprimarysiteofcellperceivingexternalsignals,controlsthecommunicationbetweencellsandenvironment[1].Acetylcholineisanimportantneurotransmitterinvolvedinthetransmissionofsignalsatjunctionsbetweennervesandbetweennerveandmuscle.Theactionofacetylch…  相似文献   

5.
Insectsarethemostsuccessfulanimalgroupintermsofnumbersofspecies.Althoughmanyfactorsmustcontributetotheprofusionofinsectspecies,onekeyelementisprobablyadevelopmentalplanthatincorporatesmetamorphosisanddiapause.Diapauseisacomplexadaptativeresponsewhichi…  相似文献   

6.
Proteincrystalgrowthhasbeenofgreatimportanceinexploitationofstructuresofbiologicalmacromolecules.Themicrogravityenvironmentinspaceisanidealplacetostudythecomplicatedproteincrystallizationprocessandtogrowgoodqualityproteincrystals.Sincethe1980s,noticeabl…  相似文献   

7.
Apoptosisorprogrammedcelldeathhasrecentlybeenrecognizedasamodeofcelldeaththatcanbeactivatedinmanysystemsbyavarietyofchemicalandphysicalstimuli.Observationfromseverallaboratoriesindicatedthatmanyanticanceragentscaninduceapoptosisindifferenttypesofcell[…  相似文献   

8.
Saccharomycescerevisiaeisanindustrialstrainwidelyusedintheproductionofethanol,breweryandsinglecellprotein(SCP).Butitisunabletofermentstarchduetothelackofamylolyticenzymes.Thestarchmustfirstbecooked,liquifiedandconvertedintoglucoseandthenutilizedincommer…  相似文献   

9.
Electro-acupuncture-mediated gene transfer   总被引:2,自引:0,他引:2  
Somaticgenetherapyisbecomingincreasinglyimportantforpotentialtreatmentofgeneticandacquireddisorders,whichispromisinginclinicalapplication.GenetransferisoneofthekeytechniquesingenetherapythatallowsinstallationandexpressionofDNAdeliveredintotargetcells[1…  相似文献   

10.
Aspecialdyestuffwaschosenandmadetobeabsorbedbythecellsoftumor,andthenthecellswereirradiatedunderalaserbeamwithacertainwavelengthinordertocurecancer.Thisisknownaslaserchemicaltherapy.Althoughphotosensitizationhasbeendevelopedintheearly20thcenturyandanum…  相似文献   

11.
Chromatinismadeupofregularlyspacedsubunits,nucleosomes.Ineukaryoticcells,chromatinisassembledimmediatedlyafterDNAreplication,butincellfreesystems,itcanbeassembledindependentofDNAreplicationwhenexogenousDNAwasaddedtoeggoroocyteextractsofXenopuslaevis.The…  相似文献   

12.
hemodificationoftumorcellsoreffectorcellsusingcytokinegenesasastrategytoenhancehostantitumorimmunityhasbeenstudiedintensivelyoverthepastfiveyears[1],buttheantigenpresentingcells(APCs)whichcanengulftumorantigensandelicitpotentantitumorresponseshavebeenig…  相似文献   

13.
Amolecularmarkercanbedesignatedascodominantordominanttypeaccordingtothegenotypicinformationprovided[1—4].Foracodominantmarker,threebandpatternscanbeobservedinelectrophoreticgels,whichcorrespondtotwocopiesoftheDNAsegmentsonthislocusbeinghomozygousP1type,h…  相似文献   

14.
Apoptoticthymocytesweredetectedinsituinthethymus[1],whiletheeffectsofthymicstromalcellsontheprocessofcelldeathofthymocytesarestillunclear.Wepreviouslyfoundthatmousethymicdendriticcells(MTSC4)enhancedtheapoptosisofthymocytesinvitro[2],andtheseeffectsweredep…  相似文献   

15.
Identification of a novel DNA-binding protein to osmotin promoter   总被引:6,自引:0,他引:6  
Osmotinisa24kubasicproteinthatwasoriginallyidentifiedasthemostprominentpolypeptidepresentinsaltadaptedtobaccocells.Theexpressionofosmotinisinducedbymanystressesandenvironmentalfactorsincludingpathogeninfection,ethylene,ABA,Methyljasmonate,salicylicacid,w…  相似文献   

16.
Xylanisamajorcomponentforminghemicelluloseandaccountsfor50%ofdryweightofherbaceousplants.Itssourcesareveryabundantintheworld.Xylanisfirstlyhydrolyzedintosmallmolecularxylose,andthenthexylosecanbeutilizedbymicrobesinmaterialcycle.Therearetwowaysforhydrol…  相似文献   

17.
Epilepsyisoneofthecommondiseasesduringchildhoodinclinicalpractice.Becauseofcomplexetiology,molecularmechanismsofepileptogenesisarenotfullyclear.Asweknowepilepsyiscausedbyimbalancebetweenexcitationandsuppressionofthebrain.Ithasbeenshowninhumanandanimalm…  相似文献   

18.
Themicroenvironmentconstitutedbythymicstromalcellsisanimportantsiteforthedevelopmentofthymocytes.95%ofthymocytesdieinthethymuseveryday,inthewayofapoptosis[1].Thecelldeathismainlycausedbythedefaultofpositiveselectionandtheactionofnegativeselectionswhichar…  相似文献   

19.
Telomereistheessentialgeneticlocusattheendsofalleukaryoticchromosomes.TheywereproposedtocapchromosomespreventingtheendtoendfusionsbetweenbrokenendsandcontinualterminalDNAlossduringreplication.Theyalsohaveinfluencesonmembranechromosomeinteractionandthe…  相似文献   

20.
日本对虾野生种群和养殖群体的同功酶遗传变异   总被引:12,自引:0,他引:12  
PenaeidshrimpPenaeusjaponicus ,commonlynamedasFloweryShrimporBandedShrimp ,isoneofthemostcommer ciallyimportantspeciesofmarinecrustaceanfisheryinChina .Beingofthewarm waterspeciesconductingshortdistancemigra tion,theanimalismainlydistributedinthecoastalwa…  相似文献   

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