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IntroductionMechanicalalloying(MA)ofelementalpowdermixtureandmechanicalmilling (MM )ofinter metallicpowderhavebeensuccessfullyemployedinrecentyearsasamethodforsynthesizingamor phousandnano crystallinealloys[1~ 3 ] .XAFSmethodwassuccessfullyusedforunderstandi… 相似文献
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王凤琼 《四川大学学报(自然科学版)》2000,34(6):944-945
InthisnoteLdenotesacompletelydistributivelatticewithanorder reversinginvolution .Forlatticetheoreticconceptswereferto [1 ].AnL fuzzytopologyonasetXisasubsetΔ LXwhichisclosedwithrespecttofiniteinfsandarbitrarysups.ΔiscalledstratifiedifΔcontainsalltheconsta… 相似文献
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Biosynthesis of Polyhydroxyalkanoates Consisting of Short-chain-length Monomers and Medium-chain-length Monomers by Pseudomonas YS1 总被引:3,自引:0,他引:3
IntroductionPolyhydroxyalkanoates(PHAs)areafamilyofbiopolyestersynthesizedbymanybacteria[1,2 ] .AmongPHAs ,polyhydroxybutyrateorPHBisthemostcommonmember[3] .AttemptshavebeenmadetodevelopcommercialfermentationprocessesfortheproductionofPHAs[4 7] .Biopol,acommerci… 相似文献
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Chitin ,whichmainlyconsistsof β(1→4 ) 2 acetamido 2 deoxy D glucopyranosestructuralunits ,isoneofthemostabundantformsofcarbohydratefoundinnature[1] .Recentdevelopmentshaveenabledtheuseofchitinandchitosaninvastlydiversefieldsrangingfromthemedicineandchemicali… 相似文献
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IntroductionAminoacylase (N acylaminoacidamidohydrolase .EC 3.5.1.14 ) ,whichexistsinmammaliankidneysandmicroorganisms ,catalyzesthereversiblehydrolysisofL acylaminoacids[1] .Theenzymeisdimericwitharelativemolecularwassof86 0 0 0 ,containingoneZn2 ionpersubunitwhichis… 相似文献
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ByapplyingahighdegreeofH2 -dilution ,nanocrystallinegermanium (nc -Ge :H)andsilicon (nc -si:H)canbegrownbyplasma -enhancedchemicalvapordeposition (PECVD)fromGeH4[1] .Majordifferences,however ,existbetweentheplasmainduceddepositionofger maniumandsilliconreflectinglar… 相似文献
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《实验动物科学》2000,17(4):61
LaboratoryAnimalMaintainedbyDepartmentOfLab .Animal,HealthScienceCenter,PekingUniversity品系名称(Strain)等级(Quality)遗传类别(Type)备注(Remark)MiceK .M 1、2远交LACA 1、2远交BALB/C 1、2、3近交C57BL/ 6J 1、2近交DBA/ 2 2近交ICR 3远交BXSB 2远交红斑狼疮模型Scid 3近交T、B联合缺陷小鼠NudeMiceICR nu 3远交T细胞缺陷裸小鼠BALB/C nu 3远交T细胞缺… 相似文献
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Wu Xinyu 《南京邮电大学学报(自然科学版)》1994,(4)
ApplicationofCellularNeuralNetworkstoMapRecognition(Ⅰ)¥WuXinyu(DepartmentofBasicCources,NanjingInstituteofPostsandTelecommuni... 相似文献
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Theabrasionresistanceofyarnsisveryimportantforthedownstreamprocessingandend use ;manyresearchworkscon cernedaboutthisaspecthavebeendone[1~ 17] .Although ,becauseofthedifferenceinstructuresandproperties ,thebehavioroftheabrasionresistanceofdifferentyarnsisdif… 相似文献