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简介：Inthisstudyamathematicalexpressionoftraceelementabundancerelationshipforthemul-ti-stagecomagmaticfractionalcrystallizationhasbeenestablished,basedongeochemicalstudiesoftheEmeishanbasalt-trachyteseriesandadjacentmafic-ultramaficlayeredintrusions,aswellasontheavail-abledataforbasalt,andesite,daciteandrhyoliteseriesinsouthernAndes,Chile,whichhavebeenwelldocumented.Itisdemonstratedthattheabundanceconstant(R)foragiventraceelementatdif-ferentstagesoffractionalcrystallizationofaparentalmagmaishighlyvariable,whichcanbeusedasacriteriontodividefractionalcrystallizationstages.

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简介：TwostrainsofgreenmicroalgaeC.reinhardtiandC.pyrenoidosawereexaminedfortheirbiosorptionofMn2+,Fe2+,Co2+,Ni2+,Cu2+,Zn2+,andCd2+fromaqueousmulti-metalsolutions.Awiderangeofbiosorptioncapacitiescanbeobservedduetodifferentstrainsofmicroalgaeanddifferentspeciesoftracemetals.Thischaracteristicwasascribedtothedistinctcomponentsandstructuresofalgalcellwallsandthedifferentphysicochemicalpropertiesoftracemetals,suchasatomicweightandiondensity.C.pyrenoidosashowedhigheruptakecapacitiesthanC.reinhardtiandbothofthemhadapreferencefortheuptakeofcadmiumoverothersinthetracemetalsolution,suggestingtheycanbeagoodbiomaterialforbiosorptionofcadmium.Livemicroalgalcellsdisplayedamorecomplexsorptionprocessthandeadmicroalgalcellsbecauseofcellassimilation.

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