Engineering-Research-Activity2016｜SHINSHU UNIV.

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Bacterial Cellulose Nanofiber-Amazing World of Fiber Spinning by Bacteria -MizunoLabCelluloseisproducedbysomekindsofbacteriaaswellasplants.Itiscalledasbacterialcelluloseormicrobialcellulose,andisusedforvariousindustrialpurposes.Inourlaboratory,wefocusonthefunctionoftheproteincomplexparticipatingincellulosebiosynthesis,whichbehaveslikeafiberspinningmachine.Itistoosmalltoobservethestructureofthisproteincomplexbymicroscope.ThuswearetryingtostudyitsstructurebyX-raycrystallographicanalysisattheatomiclevel.Thewidthofcellulosefibrilextrudedfromasingleproteincomplexisabout1.5nm.Innature,thesecellulosefibersarebundledtoformcellulosefibers(10-100nm)basedon?thearrayofproteincomplexonthecellsurfaceandthemovementofbacterium.Ifthearrayofproteincomplexcanbecontrolled,itmightbepossibletomakeacellulosenanofiberwithavarietyofthicknessandlength.MasahiroMizuno2005: Ph.Dfrom Tokyo University of Agriculture and Technology2006-: Assistant Professor of Faculty of Engineering, Shinshu UniversityX-ray crystallography of carbohydrate related enzymes.TEM image of cellulose producing bacterium (left), and SEM image of bacteria cellulose (right).Theteamworkisveryimportanttoovercomearesearchtheme.MoststudentsstayatShinshuUniversityfortheirgraduatestudies.Othersfindjobsinmanufacturingcompaniesinvariousfieldssuchaschemistry,electronics,andfood.Crystals of cellulose biosynthesis related protein.Chemistry& MaterialEngineeringIn the FutureAfter GraduationOkadaLabThereisademandformaterialswithmolecularrecognitionandseparationabilities.Preciselycontrolledadsorptivepropertiesatamolecularlevelareaprerequisite,andthuswehavebeenorganizingfunctionalorganicgroupsonsilica-basedmaterialstoinduceaselectiveadsorption.Spatialdistributionofthefunctionalgroupsinthesilicamatrixhasbeencontrolledtocreatetheactivesites(e.g.,porousstructures,reactionnano-vessels)forfutureapplicationsasanartificialenzymeandasensingdevice.Wehavebeeninterestedinhierarchicallydesignednaturalproductssuchaspreciousstonesandbeautifulanimaltissues.Periodicarrangementsofparticleswithdefinedshapescreatesuchproducts.Hybridizationoffunctionalgroupsonthesurfacesofparticleshasbeeninvestigatedforoptimizingtheperformancesincludingafacileseparationoforganicmolecules,andthedetectionofmoleculesbynakedeyes.TomohikoOkada,Associate ProfessorHe received his Dr. degree from Waseda University in 2004. His research interests include silica-based adsorbents, and catalysts.Silicate nanosheetsand organic functionalities have been used to scaffolds to create nanospacefor molecular recognition.Magnetic nanoparticlesenclosed by a silica microcapsule have been developed for a magnetically collectable, reusable adsorbent and catalyst for concentrating heavy metal ions in acidic aqueous solutions and solid acid catalysis in aqueous media.Variousmaterialsincludingorganicandinorganicsubstancesaresubjectmattersinpreparationofthesisonadsorbentsandcatalysts.Ourstudentslearnvariousinstrumentalanalysesforcharacterizingfunctionsofmaterials.Thus,thealumniareactiveinthefieldsofmechanicalandelectronicengineeringaswellaschemistry.Smart Adsorbents/catalysts from Inorganic-organic NanocompositesChemistry& MaterialEngineeringIn the FutureAfter Graduation45

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