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1、StemCellsinBiologyAnIntroductiontoStemCellsandStemCellApplicationsforEnglishLearnersAndrewCreamerLifeSciences-HHMIOutreach.Copyright2006PresidentandFellowsofHarvardCollege.ObjectivesDefineanddescribethecharacteristicsofembryonicandadultstemcellsDescrib
2、etheoriginsofvariousstemcellsDescribethedebatesurroundingandidentifymisconceptionsaboutstemcellresearchDescribethepresentandfutureapplicationsforstemcellresearchLifeSciences-HHMIOutreach.Copyright2006PresidentandFellowsofHarvardCollege.Whatmakesacellas
3、temcell?Plasticity:Astemcellisplastic,meaningitcandevelopintoanothertypeofcell.Differentiation:Theprocesswhereastemcellspecializesordevelopsintoanothertypeofcell.Self-Renewal:astemcellcandivide(renewitself)indefinitely(gothroughmitosis)andwithoutalways
4、developingintoanothercell.LifeSciences-HHMIOutreach.Copyright2006PresidentandFellowsofHarvardCollege.Self-renewalStemCellCellStemDifferentiationLifeSciences-HHMIOutreach.Copyright2006PresidentandFellowsofHarvardCollege.Differentiationhttp://stemcells.n
5、ih.gov/info/basics/basics4.asp"ImagecourtesyofNIHresourceforstemcellresearch"LifeSciences-HHMIOutreach.Copyright2006PresidentandFellowsofHarvardCollege.MajorTypesofStemCellsEmbryonicStemCellsTotipotent:cellcandevelopintoallcelltypes“Immortal”:canself-r
6、enewindefinitelyPlentifulAdultStemCellsMultipotent:cellcandevelopintoafewcelltypesbutnotallLocatedinfeworgansormaybeunidentifiedHardtofindLifeSciences-HHMIOutreach.Copyright2006PresidentandFellowsofHarvardCollege.EmbryonicStemcellsEmbryosareformedinlab
7、sthathelpcouplesgetpregnant.Aneggandspermfertilizeazygoteandareinsertedintoawoman’suterustodevelopintoanembryoandthenfetus.http://biodidac.bio.uottawa.ca/thumbnails/filedet.htm?File_name=HUMN150B&File_type=GIFLifeSciences-HHMIOutreach.Copyright2006Pres
8、identandFellowsofHarvardCollege.InVitroFertilization(IVF):aspermfertilizesanegginalabdishcreatingtheembryo.http://en.wikipedia.org/wiki/Image:Icsi.JPGLifeSciences-HHMIOutreach.Copyright2006PresidentandFellowsofHarvardCollege.EmbryonicSt
