The cytomatrix: a short history of its study

As earlyas 1820and forseveraldecadesthereafter theearly observersof thecytomatrixworked mostlywiththelight microscopeand verysimpleequipment.Itwas notuncommon fortheinvestigator simplytocrusha cellbetweentwo slidesand watchtheresults .The solemotivationforthese studies, asfarasIcanjudge,wasthesatisfaction ofcuriosity, fortherewereno grants.Suchobservations arevaluabletous today,especially thoseaccompaniedbyimaginativeinterpretations . Studieson thecytomatrixfallroughlyintothreeperiods, theearly,middle,and recent.The earlyperiod,whichwas mostlydescriptive, wasthelongestandfilled theyearsbetween 1820and 1910.Itwas a timewhen lightmicroscopeswere greatlyimproved,when chemicalfixatives werediscovered, when microtomesand stainingprocedureswereintroduced, and when thecommunity ofbiologists became awareofcells and how theydivideandassembleintotissues .Cellpathology alsowas pioneeredduringthisperiod. The middleperiodbeganaround1910andcontinueduntil 1940.The emphasisinthisperiodwason thestudyofliving cellsand on experimentsdesignedtoanswerfundamental questionsregardingtheproperties ofthecytomatrixand the structural basisofintracellular organization . The recentperiodhaswitnessedtheintroduction ofphasecontrastmicroscopy,whichgreatlyfacilitated theobservation oflivingcells .Ithasbeenalso,ofcourse,dominatedby cell fractionation and electronmicroscopy.Ithasbeena period ofintenseactivity, yieldinggreatquantities ofinformation aboutcellsand tissues .Cellbiologyhasnow emergedasa distinct science,butthecytoplasmicmatrixisstill notperceivedby allcellbiologists assomethingworthstudying. Iwouldliketobeginmy discussion withthemiddleperiod, thenlookbackattheearlyperiodforitsbackground,and finally touchon therecentand more familiarperiod.Space doesnotpermitme tomentionallthedetailsthatIwould liketo.

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