搜索结果: 1-15 共查到“理学 ex”相关记录25条 . 查询时间(0.023 秒)
生命活动往往是多种细胞协同参与、时空高度调控的复杂过程。因此，对活体中的特定细胞及特定生命分子进行原位的标记、操纵及分析，是研究现代生物学问题的关键途径。基因工程方法（如融合荧光蛋白标签）能够在活细胞中提供精准的标记信号，但其应用范围受限，不适用于一些难以转染的样品（如原代细胞、临床样品等）。而近年来发展起来的生物正交反应能通过化学手段在生命活体中进行原位研究，为生物学研究提供了简单高效的工具。特...
湖南第一师范学院数学分析课件 复变量的指数函数ex欧拉公式。
A New Record for Turkey: Salvia aristata Aucher ex Benth. (Lamiaceae)
Flora of Turkey Van Salvia Lamiaceae new record
2010/3/17
Salvia aristata Aucher ex Benth. (Lamiaceae) is recorded for the first time from south-east Turkey.
Some p.d.f.-free Upper Bounds for the Dispersion $\sigma(X)$ and the Quantity $\sigma^{2}(X)+(x-EX) ^{2}$
Quantity Dispersion p.d.f.-free Upper Bounds
2008/6/26
Some p.d.f.-free Upper Bounds for the Dispersion $\sigma(X)$ and the Quantity $\sigma^{2}(X)+(x-EX) ^{2}$.
Genetic Differentiation of Abies equi-trojani (Asch. & Sint. ex Boiss) Mattf. Populations from Kazdağı, Turkey and the Genetic Relationship between Turkish Firs belonging to the Abies nordmanniana Spach Complex
Abies equi-trojani A. nordmanniana, A. bornmuelleriana Genetic similarity Genetic distance RAPD Markers cp-SSR
2010/3/17
The present study aimed to test the utility of RAPD (randomly amplified polymorphic DNA) and cpSSR (simple sequence repeats) markers for in situ gene conservation programs for fir species, as well as ...
注意植物迁地保护中的遗传风险Pay Attention to Genetic Risks in Plant Ex Situ Conservation
植物园 迁地保护 遗传风险 遗传管理
2008/1/6
摘要稀有濒危植物迁地保护的长期目标之一就是要保护物种的遗传多样性和进化潜力。介绍了稀有濒危植物在植物园迁地保护过程中存在的一系列遗传风险。由于引种或取样的不足，容易导致被保存的物种缺乏足够的遗传代表性；盲目的引种、不合理的定植以及材料的来源不清则会导致稀有濒危植物的遗传混杂、近交衰退或杂交衰退；人为选择和生长环境的改变也容易造成濒危物种对迁地保护的遗传适应。在实际的迁地保护工作中，这些遗传风险往往...
摘要 用猪甲状腺球蛋白-Sepharose 4B作亲和吸附剂,再经Sephadex G-100凝胶过滤,可以从岩豆种子中纯化出岩豆凝集素(MDL)。该凝集素可以凝集人类A、B、O型血细胞和兔红细胞,纯化的MDL凝集兔红细胞的能力可被D-松三糖、邻硝基-苯酚-D-半乳糖和N-乙酰半乳糖胺抑制,甘露糖也有弱的抑制作用。纯化的MDL在PAGE和SDS-PAGE上均显现单一蛋白质染色带,经Schiff’s...
摘要 用最大泡压法考察季铵盐Gemini表面活性剂C12-2-Ex-C12?2Br (x＝1, 2, 3)在气/液表面吸附动力学行为, 研究表明增加表面活性剂体相浓度和温度将加快分子扩散速度, 因此提高了表面吸附的动力学效果. 增加联接链长度x减小了分子预聚集倾向, 溶液中的单分子浓度增加, 有利于初始扩散, 使γt降低. 接近饱和吸附时, 由于x较大的单元分子在表面层占据的截面积也较大, 降低了...
摘要 从金针菇Flammulina velutipes(Curt.ex Fr.)Sing.子实体中提取水溶性多糖,经乙醇分级,DEAE-Sephadex A-25纯化,得PA_5DE。以聚丙烯酰胺凝胶电泳和凝胶柱Sepharose 4B层析证明是化学均一性多糖,分子量是47.1万。用GLC、I.R、~13C-N.M.R.分析表明含有D-葡萄糖、D-甘露糖、D-岩藻糖。PA_5DE分子可能具有分支结...
Floral Biology, Breeding System, and Pollination Ecology of Cucurbita moschata (Duch. ex Lam) Duch. ex Poir. Varieties (Cucurbitaceae) from Parts of the Niger Delta, Nigeria
Breeding system Cucurbita moschata Cucurbitaceae floral biology Nigeria pollination
2010/3/18
Flowering, breeding mechanisms, and pollination biology of Cucurbita moschata (Duch. ex Lam) Duch. ex Poir. varieties were studied. C. moschata carries male and female flowers on the same plant and is...
电偶源频率电磁测深中的Ex分量
2007/7/28
期刊信息
篇名
电偶源频率电磁测深中的Ex分量
语种
中文
撰写或编译
撰写
作者
陈明生,阎述,陶冬琴
第一作者单位
煤炭科学研究总院西安分院
刊物名称
煤田地质与勘探
页面
1998,26(6),60-66
出版日期
1998年
12月
日
文章标识(ISSN)
1001-1982
相关项目
复杂三维地电模型电偶源频率电磁测深有限元正演模拟
A New Genus Record for the Flora of Turkey: Tetradiclis Stev. ex M.Bieb. (Zygophyllaceae)A New Genus Record for the Flora of Turkey: Tetradiclis Stev. ex M.Bieb. (Zygophyllaceae)
Tetradiclis Zygophyllaceae new record Turkey
2010/3/19
Tetradiclis tenella (Ehrenb.) Litw. (Zygophyllaceae), recently collected from Kırıkkale (Central Anatolia), is a new record for the flora of Turkey. A description, its phytogeographical impo...
A Contribution to the Flora of Turkey: Padus avium Mill. subsp. petraea (Tausch) Pawlowski ex Holub.
Bird cherry, Padus avium Rosaceae Turkey
2010/3/19
Padus avium Mill. specimens collected from NE Anatolia, A8 Trabzon, Demirkapı and Arpaözü villages, are described as P. avium Mill. subsp. petraea (Tausch) Pawlowski ex Holub. A line drawing...
Main Flavonoids of Tilia argentea DESF. ex DC. Leaves
Flavonol glycosides Kaempferol 3,7-O-a-L-dirhamnoside Quercetin 3,7-O-a -L-dirhamnoside Lime Linden Tilia argentea Tiliaceae
2010/4/20
Kaempferol 3,7-O-a -L-dirhamnoside (I) and quercetin 3,7-O-a -L-dirhamnoside (II) were isolated from the leaves of Tilia argentea (Tiliaceae). The structure elucidation of the isolated compounds was p...
Electrical and Structural Properties of Ex-situ Annealed Superconducting Bi2Sr2CaCu2O8 Thin Films Obtained by Coevaporation of Components
Superconductivity BSCCO 2212 phase thin film coevaporation ex-situ annealing
2010/4/12
Bi2Sr2CaCu2O8 system superconducting thin films were obtained by synchronized deposition of Bi, Cu, CaF2 and SrF2 components onto cleaved MgO (100) single crystal substrates after annealing in the tem...