浓度梯度

• After dna sequencing was correct , it was transformed into p . pastoris km71h strain by electroporation . highly resistant recombinant was isolated by increasing concentrations of zeocin ? positive clone was selected by pcr . the positive clone was induced with methanol
  抗生素zeocin ~ ( tm )浓度梯度筛选高拷贝菌株，分别提取这些高拷贝菌株的基因组dna ，以此为模板做pcr反应鉴定阳性克隆。
• Because drug molecules are rapidly removed by the systemic circulation and distributed into a large volume of body fluids and tissues , drug concentration in blood is initially low compared with that at the administration site , producing a large gradient
  由于药物分子是经体循环快速转运并分布到大容积体液和组织中去的，所以开始时，血液中的药物浓度低于给药部位的药物浓度，形成大的浓度梯度。
• Here we report that growth cones of rat cerebellar axons in culture turned away from a gradient of sdf - 1 , a chemokine that attracts migrating leukocytes and cerebellar granule cells via a g protein - coupled receptor ( gpcr )
  以前的证据表明， sdf - 1 ，一种经典的chemokine ，能够吸引白细胞和迁移中的神经元，这种作用是通过g蛋白耦联受体介导的。利用生长锥转向分析，我们发现sdf - 1的浓度梯度能够吸引或排斥培养的小脑颗粒细胞的生长锥。
• Crumbs of nails were isolated from onychomycosis suffers , koh was chosen to be solvent , nail fungi were examined by microscopy , cultured in sabourud , purified by method of concentration grads and method of exsecting cusp of mycelia . finally , sixteen purified strains were ready
  从甲病患者病甲中分离出甲碎屑，选用koh为浮载剂，直接镜检，采用沙堡氏培养基对它们进行分离培养，浓度梯度法和切取菌丝尖端生长法对菌种进行纯化，得到纯化后的菌株16株。
• 3 . algebraically explicit analytical solutions of two - buoyancy natural convection in porous media applying the approach of separating variables with addition , the thesis derives three sets of simple and clear algebraically explicit analytical equations describing the natural convection in porous media with both temperature and concentration gradients . besides the theoretical meaning , they are more valuable for be the benchmark solutions to check and improve the computational fluid dynamics and computational heat and mass transfer
  三、多孔介质中温度与浓度梯度耦合自然对流基本方程的代数显式解析解本论文对王补宣院士等给出的反映多孔介质中温度与浓度耦合自然对流的五元非线性联立偏微分方程，利用加法分离变量法，导出了三套比较简明的代数显式解析解。
• The concentration of silicate , phosphate , dop , pp and tp in autumn 1997 were higher than those in spring 1998 , the average concentration were 11 . 6 ? . 7 , 0 . 44 ? . 09 , 0 . 26 ? . 18 , 0 . 82 ? . 99 and 1 . 52 ? . l5 mol / dm3 for autumn , and 9 . 61 ? . 84 , 0 . 3410 . 13 , 0 . 13 ? . 11 , 0 . 2110 . 14 1 0 . 6810 . 24 mol / dm3 in spring , respectively
  1997年秋季海水中硅及各种形态磷的含量均高于春季，除no _ 3 - n外， 1998年春季海水中各种形态氮的浓度均高于秋季。秋季pn和pp显示出较强的垂直浓度梯度，其他形态营养盐垂直分布比较均匀。
• The algae multiplied massively in suitable environment , and made the amount of available phosphorus in soil increase significantly . the influence of the base matter on available phosphorus in soil was much more significant . in the second step , nostoc commune and chlamydomonas sajao lewin were inoculated of different inoculation quantities to the barren soils
  实验是在贫瘠土壤种接种具有固氮能力的念珠藻(蓝藻类)和沙角衣藻(陆生绿藻) ，在0 . 1g 、 0 . 5g 、 1 . 0g 、 2 . 0g湿藻重500g土重的不同浓度梯度进行接种，进行常温下培养。
• The research include : 1 ) measuring co2 concentration in the soil air and vegetation air by using co2 measuring instruments ; 2 ) measuring the releasing rate of co2 coming from soil surface by using alkaline absorbing method ; 3 ) measuring the hydrochemical indexes of soil water . the research results are as follows : ( 1 ) the author has made field observation of depth distribution of soil air co2 in the mt . jinfo karst experiment site . the results show that two concentration gradient , soil to atmosphere and soil to carbonate rock , are form
  本次实验以典型的亚热带岩溶分布区?金佛山自然保护区为例，选择了岩溶洼地内的高山草甸和靠洼地边缘地带的方竹林、裸地以及石林内的乔木林4个样地，对土壤co _ 2浓度空间分布规律以及昼夜动态和日动态变化状况进行了观测，获得了如下新的认识： ( 1 )土壤中co _ 2浓度分布的观测结果表明，土壤中具有土壤-大气、土壤-碳酸盐岩两个方向的co _ 2浓度梯度。
• Abstract : in the paper the deterrent content and the concentration of diphenylamine dibuty l phthalate and centralite in finished product manufactured by two different methods were analyzed by high performance liquid chromatography , which can provi dereference for adjusting the technology of the propellant manufacture
  文摘:利用高效液相色谱仪分别测定了发射药在两种制备工艺中的钝感剂邻苯二甲酸二丁酯和二号中定剂的含量及邻苯二甲酸二丁酸在其中的浓度梯度分布，为调整发射药制备工艺提供了参考。