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1.
Anorganism,S.cerevisiaewidelyusedinbrewing,bakingandinethanolproductionprocessesisnotabletohydrolysestarch.ThusthetraditionalconversionofstarchintoethanolandCO2dependsontheadditionoftheenzymespriortofermentation,whichleadstoliquificationandsaccharificat…  相似文献   

2.
Saccharomycescerevisiaeisanindustrialstrainwidelyusedintheproductionofethanol,breweryandsinglecellprotein(SCP).Butitisunabletofermentstarchduetothelackofamylolyticenzymes.Thestarchmustfirstbecooked,liquifiedandconvertedintoglucoseandthenutilizedincommer…  相似文献   

3.
α1adrenergicreceptors(α1AR)belongtothesuperfamilyofGproteincoupledreceptors.Prolongedactivationofthesereceptorswouldleadtoadecreaseinagonistsensitivity.Theprocessmayberelatedtoreceptordownregulation,sequestrationandphospholation,etc.Desensitizationofα1BAR…  相似文献   

4.
胱天蛋白酶(caspase)的前结构域   总被引:1,自引:0,他引:1  
胱天蛋白酶 (caspase)是白细胞介素 1β转化酶(interleukin 1βenzyme ,ICE)家族的总称 ,Caspase(cysteineaspartate specialproteases)的含义是该类蛋白酶的活性部位为极为保守的半胱氨酸 (cysteine)残基 (取第一个字母“c”) ,又特异性切割底物的天冬氨酸 ,用“aspase”表示 ,简称caspase ,该酶在细胞凋亡过程中起关键作用 ,是目前研究的热点。现已发现的caspase有 14种 ,它们均以无活性的酶原的形式存在 ,包括一个N末端前结构域 (p…  相似文献   

5.
QuantitativeChangesinMainParametersofSecondaryXylemduringAgingProcessinPinusbugeanaLINJin-xing;(林金星),LINYue-hui;(林月惠),WEILin-...  相似文献   

6.
匙叶翼首花的化学成分   总被引:19,自引:3,他引:16  
从药用植物匙叶翼首花(Pterocephalus hookeri)中分离了7个化合物。通过波谱分析及已知物数据对照,分别鉴定为songorosideA⑴,loganin⑵,软脂酸(palmitic acid,3),乌索酸(ursolic acid,4),齐墩果酸(oleanolic acid,5),β-谷甾醇(β-sitosterol,6),β-龙胆二糖(β-gentiobiose,7),其中2是  相似文献   

7.
DynamicChangesofβTubulinduringtheResumptionofMeiosisofMouseOocyteLIUHui;(刘辉)CHENDa-yuan;(陈大元)(StateKeyLaoboratoryofReproducti...  相似文献   

8.
唐珂  景乃禾 《生命的化学》2001,21(3):195-198
老年痴呆症 (Alzheimer′sdisease ,AD)是一种神经退行性疾病 ,是人生中、老年期最常见的痴呆病症。据估计 ,7%~ 1 0 % 6 5岁以上、40 % 80岁以上的老年人患有该病[1,2 ] 。对AD的研究 ,阐明其致病机制 ,是科学家们不懈努力的方向。越来越多的证据表明 ,Aβ蛋白 ( β amyloidprotein)在AD致病分子机制中处于中心位置[3 ] 。在AD的致病机理中 ,与Aβ蛋白形成直接相关的两个蛋白水解酶———β及γ 分泌酶 ( β secretase和γ secretase)是何物 ,一直是个悬而未决的问题。然而 ,…  相似文献   

9.
Alotofbioactivesubstancesareproducedbymonocytes/macrophagesonthestimulationofendotoxin,alsocaledaslipopolysaccharide(LPS),wh...  相似文献   

10.
Phycobiliproteins,whichincludephycoerythrin,phycocyanin,allophycocyaninandphycoerythrocyanin,arelightharvestingchromoproteinsinrhodophyceae,cyanobacteria,cryptophyceaeandsomepyrrophyceae[1,2].Phycobiliproteinsarecomposedofα,βandγ(onlyinphycoerythrin)subunit…  相似文献   

11.
Chinese tomato yellow leaf curl virus--a new species of geminivirus   总被引:5,自引:0,他引:5  
GeminivirusesareagroupofplantvirusescharacterizedbytheircircularsinglestrandedDNA(ssDNA)genomeandauniquegeminateparticlemorphology[1].Geminivirusesaredividedintothreesubgroupsonthebasisofgenomeorganizationandinsectvector:AllsubgroupIgeminivirusesareleaf…  相似文献   

12.
Insectsarethemostsuccessfulanimalgroupintermsofnumbersofspecies.Althoughmanyfactorsmustcontributetotheprofusionofinsectspecies,onekeyelementisprobablyadevelopmentalplanthatincorporatesmetamorphosisanddiapause.Diapauseisacomplexadaptativeresponsewhichi…  相似文献   

13.
Inrecentyears,theresearchofusingmammaryglandbioreactorstoproducelargeamountsofhumanpharmaceuticalproteinsdrawmoreandmoreattentionwiththedevelopmentoftransgenictechniques.Transgeneexpressioninmilkoffersseveralpotentialadvantages:proteinssecretedinmilk,w…  相似文献   

14.
水青树和昆栏树茎皮的化学成分   总被引:3,自引:0,他引:3  
用化学和波谱分析方法从水青树(Tetracentron sinense Oliv.)茎皮中分离鉴定了5个化合物,分别为丁香甙(syringanide)、儿茶素(catechin)、β-谷甾醇(β-sitosterol)、胡萝卜甙(daucosterol)和白桦脂醇(betulin),均为从该种植物中首次分得。从昆栏树(Trochodendron aralioide Sieb.etZucc.)茎皮中  相似文献   

15.
《化石》2000,(3)
TheNationalMuseumofPlantHistoryofChinaisabranchofherbarium,InstituteofBotany,theChineseAcademyofSciences.Itwasbuiltin1996andofficiallyapprovedbytheChineseAcademyofSciencesin1998.ItwasinscribedbyZhouGuangzhao,Thevice -ChairmanofStandingCommitteeofChine…  相似文献   

16.
稻纵卷叶螟对杂交水稻及常规水稻的生态反应   总被引:6,自引:0,他引:6  
钱希 《生态学杂志》1993,12(6):21-24
稻纵卷叶螟对杂交水稻及常规水稻的生态反应钱希(国营黄海农场,江苏省响水县224624)EcologiealResponsesofRiceCasewormtoHybridRicesandTraditionalRices¥QianXi(TheStateFarmofYellowSea,XiangshuiCounty,Jiangsu,Province224624).ChineseJournalofEcology,1993,12(6):21-24.Tostudytheeffectofricecultivarsontheoviposition,emergence,wormdevelopmentandnaturalenemvparasitionofcasewormandlossescausedbythepest,observationshavebeenmadeon16ricecultivarsinHuanghaiStateFarminNorthernJiangsuprovince,wherecasewormgraduallybecomemoreandmorevi-olentsincethechangesincultiva  相似文献   

17.
Xylanisamajorcomponentforminghemicelluloseandaccountsfor50%ofdryweightofherbaceousplants.Itssourcesareveryabundantintheworld.Xylanisfirstlyhydrolyzedintosmallmolecularxylose,andthenthexylosecanbeutilizedbymicrobesinmaterialcycle.Therearetwowaysforhydrol…  相似文献   

18.
毛白杨COMT基因cDNA的克隆、序列与特异性表达分析   总被引:5,自引:0,他引:5  
Ligninisanabundantnaturalproductiononlysecondtothecellulose ,asacellwallcomponentofallvascularplantsinbiosphere .Despiteitsimportantbiologicalsig nificanceinplants ,ligninisanundesirablecomponentinthechemicalprocessofpaperpulping ,andithasnegativeimpacto…  相似文献   

19.
鼎湖山土壤的微生物及其对酸度的适应特征   总被引:2,自引:0,他引:2  
鼎湖山土壤的微生物及其对酸度的适应特征葛荣盛(广东省土壤研究所广州510650)SoilMicrobcsatDinghushanNaturalReserveandTheirAdaptabilitytoAcidity¥.GeRongsheng(Guang-dongInstituteofSoilSciences,Guangzhou510650).ChineseJournalofEcology,1993,12(3):11-18.ThispaperdiscussesthemicrofloraeinsoilsunderdifferentforesttypesatDinghusannaturalreserveandtheiradaptabilitytoacidity:1.Undermixedforest,ammonifyingBacteria,cellulose-decomposingbacteriaandOligonitrophilesaredominant;underbroadleavedforest,ceIlulose-decomposingfungiaremore;andlittledifferencecanb  相似文献   

20.
生态农业:一种思想体系传播的实证分析   总被引:1,自引:0,他引:1  
李季 《生态学杂志》1993,12(3):63-67
生态农业:一种思想体系传播的实证分析李季(北京农业大学100094)EcologicalAgriculture:APositiveAnalysisoftheSpreadingofItsIdeology¥.LiJi(DepartmentofLandResources.BeijingAgriculturalUniversity,Beijing100094).ChineseJournalofEcology,1993,12(3):63-67.ThispaperreviewstheoverallhistoriesofecologicalagricultureinChinainthelast10years,includingitsfeatures,researchesandpractices,andgivessomediscussions,conclusionsandperspectivesofitsdevelop-mentaltrend.Keywords:ecologicalagriculture,ecosystem,eco-economics.我国的生态农业从兴起到现在已十余载,其发展之迅猛无论在理论上还是实践上,  相似文献   

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