共查询到20条相似文献,搜索用时 31 毫秒
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.
Differential effects of Ca2+ and Mg2+ on endonuclease activation in isolated promyelocytic HL-60 cell nuclei 总被引:1,自引:0,他引:1
Apoptosisorprogrammedcelldeath(PCD)isaprocessofcelldeletionwhichoccursinresponsetoanumberofcytotoxicandphysiologicallyrelevantstimuli.Thisprocessischaracterizedbyseveralearlymorphologicalterationsincludingplasmaandnuclearmembraneblebbing.Endogenousendo… 相似文献
4.
Nicotinic acetylcholine receptor is involved in acetylcholine regulating stomatal movement 总被引:4,自引:0,他引: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.
Membrane molecules in induction of apoptosis of thymocytes by mouse thymic dendritic cells which express Fas ligands 总被引:6,自引:0,他引:6
Apoptoticthymocytesweredetectedinsituinthethymus[1],whiletheeffectsofthymicstromalcellsontheprocessofcelldeathofthymocytesarestillunclear.Wepreviouslyfoundthatmousethymicdendriticcells(MTSC4)enhancedtheapoptosisofthymocytesinvitro[2],andtheseeffectsweredep… 相似文献
15.
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