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- W2130245811 abstract "Conferenceson thenatureofprotoplasmhavenotbeen in vogueforperhapssome 30-oddyears,inpartforreasonsthat Iwishtodiscuss, but,withtheturningoftime'skaleidoscope, new patternsoforganization havenow emergedand a new synthesis isperhapspossible .Cellbiologyispassingfroman analytical phaseinwhich eachcomponent ofthecellwas isolated and characterized apartfromothercomponentstoa new phaseinwhichtheintegration ofthesecomponentsto giverecognizablecellbehavioronce againiscommanding considerable attention .Inhisintroduction tothissupplement, Porterpointsoutthatthesequestionson thecytoplasmic matrixand theintegration ofcellular functionarea partof ourheritagethatextendsbackatleast100yearsandwerethe subjectof intensiveexperimentalinquiryin the firstfew decadesofthiscentury.At least,we can confronttheold questionswithnew perspectives and perhapsfindimportant new questionstoaskofthecell. Our heritagehastwoaspects, thefirstandolderonebeing a viewofthecytomatrixbasedon physicalchemistry.Porter remindsusofthecolloidal and coacervatechemistryofthe cytoplasm.Thisistheviewofprotoplasmasathixotropic gel and areturntoexplanations ofcellbehaviorbasedon sol-gel transformations, forexample.The otherviewofthecytomatrixisstructural, and althoughitechoesancientideas,itis basedprimarilyon thehigh-voltage electronmicroscopyof cellwholemountsaspracticed inthelastdecadeorso.Porter referstothisbasicstructural organization ofthecytomatrix asthemicrotrabecular lattice (MTL).'The MTL connectsor entrapsallformedstructures inthecelland influences, aswe shallsee,themost intimateproperties ofmoleculesinthe cytoplasm.The cytoplasmhastwo phases:cytosoland cytomatrix.Intherecentpast,onlythecytosolic fractionofthe cytoplasmhasbeenconsidered, butthepaperspresentedin thissupplementshow us thata new biochemsitryof the cytomatrixisrapidlybeingdeveloped. The major filamentsystemsof the cytomatrixarethe subjectofthearticles by Stossel, Steinertetal.,Olmstedet al.,and Pollardetal.The manner inwhichtheseelements areinterconnected and theirspatialspecification withinthe cellconcernValleeetal.,Tucker,Tiwarietal.,Tilneyand Tilney,Mangeat and Burridge,Millerand Solomon, Moo" @default.
- W2130245811 created "2016-06-24" @default.
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- W2130245811 date "1984-07-01" @default.
- W2130245811 modified "2023-10-16" @default.
- W2130245811 title "Cytoplasmic matrix: old and new questions." @default.
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- W2130245811 doi "https://doi.org/10.1083/jcb.99.1.235s" @default.
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