共查询到20条相似文献,搜索用时 437 毫秒
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LDLRplaysavitalroleineliminatingplasmacholesterol.KnockingoutLDLRgenecancausehypercholesterolemia.Personswithfamilialhypercholesterolemia(FH)havebeenfoundtohavegeneticdefectsinLDLRgene.IntroducingLDLRgenetoexperimentalanimalswithhypercholesterolemiacou… 相似文献
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内分泌疾病血浆氨基酸的模式蒋滢,黄美英,何达纯PlasmaFreeAminoAcidinEndocrineDiseases¥JiangYing;HiiangMeiyingandHeDachun(DepartmentofBiochemistry,Suz... 相似文献
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大连潮间带底栖海藻群落的数量特征和优势种的季节变化 总被引:5,自引:0,他引:5
大连潮间带底栖海藻群落的数量特征和优势种的季节变化熊韶峻,王献平,郭旭光(辽宁师范大学生物系,大连116022)SeasonalVariationofQuantitativeCharactersandDominantSpeciesofBenthicSeaweedCommunitieswithinIntertidalsinDalian,China¥.XiongShaojun,WangXianping,GuoXuguang(DepartmentofBiolo-gy,LiaoningNormalUniuersity,Dalian116022).ChineseJournalofEcology,1993,12(4):27-29.Thecomposition,coverage,biornassanddorninantspeciesofbenthicseaweedcornmunltywithinintertidalinDalian,ChinaweremonthlyinvestigatedfrornMarch1990toMarch1991.Itisxhownthat1).thegen-eraltendencyofseaso 相似文献
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1 厚叶瑞香 新种 图 1 :1~ 2DaphnepachyphyllaD .Fang,sp .nov.Fig .1 :1~ 2AD .xichouensiH .F .ZhouexC .Y .Changfoliorumlaminiscoriaceisvelcrassecoriaceissaepeinaequilaterissiccosuprarugosissubtussubbrunnescentibusjuventutemarginedenseciliatis,bracteismajoribus1 0~ 1 6mmlongisecil… 相似文献
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沈阳市东陵区丘陵坡地坡面太阳直射光的分布及其分析郭林海(中国科学院沈阳应用生态研究所,110015)DistributionofDirectSolarRadiationonHillySlopesofDonglingDistrictofShenyangMunicipalityandItsAnalysis¥GuoLinhai(InstituteofAppliedEcology,AcademiaSinica,Shenyang110015).ChineseJournalofEcology,1993,12(1):59-61.Basedonthelatest1:50000topographicmap,the1:100000slopegradationmapisdrawnoutandareacalculationismade.Thedirectsolarradiationintypicalsitesofthedistrictismeasuredandcalculated,andthevariationcurvesofannualfluxofdirectsolarradiationonvariousslopedirecti 相似文献
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Synergistic effects of focus ultrasound with different frequency and hematoporphyrin on human tumor cells 总被引:4,自引:0,他引:4
Photodynestictherapy(PDT)hasbeenextremelywellstudiedsinceDoughertyandcoworkersobservedtheobviousantitumoreffectofthecombinationoflaserwithhematoporphyrin[1].Andithasbeenusedintheclinictherapyforhumantumors[2].However,thelighthasthedisadvantageofpoorpenetr… 相似文献
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氮磷钾肥施用对蔬菜中硝酸盐积累的数学模型 总被引:10,自引:0,他引:10
氮磷钾肥施用对蔬菜中硝酸盐积累的数学模型段咏新付庭治(徐州师范学院生物系,221009)(南京大学生物系,210008)MathematicalModelonNitrateAccumulationinVegetableafterApplyingN,PandKFertilizers¥DuanYongxin(DepartmentofBiology,XuzhouTeacher'sCollege,221009),FuTingzhi(DepartmentofBiology,NanjingUniversity,210008).ChineseJournalofEcology,1993,12(6):34-36.InThispaper,aregressionwodelonnitrateaccumulationinspirachisestablised,whichcanpredicttheaccumulationamountofnitrateunderdifferentapplicationratesofN,PandKfertilizers。Usingthismodel,thenitratecontentinspirachca 相似文献
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刘笃琏 《氨基酸和生物资源》1994,(3)
胱氨酸生产中中和过程的数学描述刘笃琏MathematicalDescriptionofNeutralizationinCystineProduction¥LiuDulianAbstracts:Inthispassage,threepracticalf... 相似文献
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动脉平滑肌细胞sis/PDGF—B链的表达和调控 总被引:1,自引:0,他引:1
介绍平滑肌细胞sis/PDGF-B链表达和调控的进展。c-sis原癌基因是PDGF-B的同源基因,将外源的PDGF基因导入哺乳类细胞是研究PDGF功能和调控的重要手段。内皮素IL、TNF、血管紧张素Ⅱ和蛋白激酶C可调节sis基因的表达。suramin和新霉素的人工合成为拮抗PDGF效应提供广阔的前景。c-sis可通过激活c-myc,c-fos等原癌基因而促进细胞增殖。 相似文献
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小麦醇溶蛋白盒结合因子基因启动子序列 总被引:2,自引:0,他引:2
1 Source Thesequencewasdeterminedfromare versePCRproduct,whichwasligatedtopMD1 8 Tvector(TaKaRaBiotechnologyCo .) ,fromnucleargenomicD 相似文献
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Abstract. A new method is described for measuring tree height in tropical forest with a dense undergrowth, the so-called angles-measure method, which is related to the height-matching method formerly used by British foresters. 相似文献
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四种提取芸芥基因组DNA方法的比较 总被引:4,自引:0,他引:4
以芸芥为材料 ,分别用CTAB法、SDS法、尿素法、NaOH法四种方法对芸芥基因组DNA进行了提取 ;并用紫外光分光光度计法、琼脂糖电泳法和RAPD分析法对所提取的DNA进行检测 ,将它们在DNA的产量、质量和耗时、耗费等方面的优缺点进行比较 ,以便在实际工作中根据不同的试验条件选取最合适的提取方法。通过四种方法的比较 ,研究认为尿素法是芸芥基因组DNA的最佳提取方法。 相似文献
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目的:研究提取不同时期小麦网腥黑粉菌冬孢子总DNA的最佳方法。方法:应用改良过的四种方法(CTAB法、SDS-CTAB法、SDS法和尿素法)对小麦网腥黑粉菌冬孢子总DNA进行提取。结果:提取当年小麦网腥黑粉菌冬孢子DNA,纯度(OD260/OD280):CTAB法〉SDS-CTAB法〉SDS法〉尿素法=1.876〉1.7815〉1.7789〉1.6095;产率(μg/g):SDS-CTAB法〉SDS法〉尿素法〉CTAB法=796.25〉664〉306〉291.5。提取15年的小麦网腥黑粉菌冬孢子DNA,纯度(OD260/OD280):CTAB法〉SDS-CTAB法〉SDS法〉尿素法=1.91795〉1.8876〉1.65985〉1.55925;产率(μg/g):尿素法〉CTAB法〉SDS法〉SDS-CTAB法=1529.25〉799〉687.25〉372.5。结论:SDS-CTAB法是提取当年小麦网腥黑粉菌冬孢子DNA的最佳方法。CTAB法是提取15年的小麦网腥黑粉菌冬孢子DNA的最佳方法。 相似文献
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Gary A. Sod 《Journal of mathematical biology》1986,24(3):279-289
A numerical method is presented for the solution of reaction diffusion systems in biology. The method is used to re-examine the oxygen diffusion in a spherical cell with the Michaelis-Menten oxygen uptake kinetics. 相似文献
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Rooting measurements have been made at different growth stages for sugar beets (1987) and for cereals (1988) on three different sites using four different root measurement techniques: (a) the core method where roots were extracted and root length is directly measured, (b) the core-break method where the visible roots were counted on the faces of a broken soil column, (c) the trench profile wall method where the number of visible roots were counted and the root length density was estimated on a profile wall, and (d) the monolith method where the roots were extracted from monoliths dug out from a profile wall. The calibration curves between the field methods and the extraction methods were not linear, and regression coefficients differed significantly between different sites, crops and between fields with different agronomic management, e.g. irrigation and liquid manure application. Differences between growth stages were comparably low compared with those found between locations. Root length densities obtained with the trench profile method were on average 10-fold lower in the sand brown earth, 6-fold lower in the vertisol and 4 times lower in the cambisol compared to data obtained with the core method. It is therefore concluded that the core-break method and the trench profile wall method deliver no reliable data for comparing rooting intensities between different soils and between different crops if they are not calibrated with an extraction method for each site and crop. 相似文献
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参考国内外昆虫基因组DNA提取的常用方法,选取KAc法、氯仿-异戊醇法和盐析法3种方法对苹果绵蚜(Eriosoma lanigerum)基因组DNA进行提取.通过基因组DNA直接琼脂糖凝胶电泳、SSR引物扩增产物的琼脂糖凝胶电泳和聚丙烯酰胺凝胶电泳检测,对3种方法所提基因组DNA的质量进行了比较,并综合分析了提取所需时间及所用试剂的毒性大小等.结果表明,盐析法操作程序较简便快捷,节时省工,可得较好质量的DNA样本,且对试验操作人员无伤害,是一种值得推广应用的基因组DNA提取方法. 相似文献
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Several non-Ewald methods for calculating electrostatic interactions have recently been developed, such as the Wolf method, the reaction field method, the pre-averaging method, and the zero-dipole summation method, for molecular dynamics simulations of various physical systems, including biomolecular systems. We review the theories of these approaches and their potential applications to molecular simulations, and discuss their relationships. 相似文献