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density gradient
相关语句
  密度梯度
     A SIMPLE METHOD FOR PREPARING LINEAR SUCROSE DENSITY GRADIENT USED FOR CENTRIFUGAL ANALYSIS
     离心分析用蔗糖密度梯度简易制备法
短句来源
     Separation of Plant Pollen in Different Phases of Development by Density Gradient CentrifuRation of Percoll
     应用percoll密度梯度离心分离不同类型的花粉粒
短句来源
     The purification of coxiella burnetii by meglumini diatrizoatis composita density gradient centrifugation
     国产泛影葡胺密度梯度沉降法纯化Q热立克次体
短句来源
     PURIFICATION OF PLASMID DNA BY RAPID DENSITY GRADIENT CENTRIFUGATION
     快速密度梯度离心法纯化质粒DNA
短句来源
     Techniques of density gradient centrifugation
     密度梯度离心技术
短句来源
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  浓度梯度
     In order to study the influences made by SMW-chitosan as additives on Tilapia liver lipid digest and forage utilization efficiency, we use singular factor density gradient method in Tilapia (body weight 18.96±1.24 g)diet .
     为研究低分子壳聚糖 (SMW Chitosan)对罗非鱼 (Tilapia)肝脏脂肪代谢和饲料利用率的影响效果 ,实验采用单因子浓度梯度法饲养罗非鱼 (体重 1 8 96± 1 2 4g)。
短句来源
     The total DNA was diluted to density gradient and amplified by PCR. The results showed that it could detect the virus in 2.5 μg leaf tissue.
     通过总DNA浓度梯度稀释,进行PCR扩增,结果表明能检测到2.5μg叶组织中病毒的存在。
短句来源
     The effect of SMW-chitosan on the liver tissue oxidation resistance capacity and liver fat content in Tilapia nilotica was studied by using single factor density gradient method.
     采用单因子浓度梯度法 ,研究低分子壳聚糖 (SMW chitosan)对尼罗罗非鱼 (Tilapianilotica)肝组织抗氧化能力和肝脂含量的影响。
短句来源
     Meanwhile,it can efficiently restrain organized defect of single seeping. As a consquence,the density gradient and hardness gradient are smooth; the combinational degree of seeping layer and body is high and the strength of the remains on the surface is strong as well as the comprehensive function of machine is excellent.
     结果表明,此工艺具有处理温度低、渗速快、渗碳层和碳氮共渗层厚度可按比例调整等优点,同时能有效抑制单一渗碳和单一碳氮共渗中易产生的组织缺陷,渗层浓度梯度和硬度梯度平缓,渗层与基体结合强度较高、表面残余应力高,综合机械性能好.
短句来源
     Methods After the βLp subfractions were isolated by mechanisms of molecular sieving and isoelectric focusing due to density and pH grade in the non-linear density gradient polyacrylamide gel, the gels were acquired with a gel imaging system, the electrophoretograms were quantitatively analyzed with optical density scanner.
     方法在不同浓度梯度凝胶中匹配一定的pH梯度,借助浓度梯度的分子筛作用和pH梯度的聚焦作用,促进βLp亚组分分离,通过凝胶成像系统和光密度扫描仪完成βLp谱的记录和量化分析。
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  “density gradient”译为未确定词的双语例句
     Murine Luekemia Viruses(MuLV) were isolated from the supernatants of SRSV/ST3, L783V/8T8, L615K, the T-S-Z system L6565 and Molony-MuLV(A9) cell cultures by using sucrose density gradient centrifugation.
     采用蔗糖等密度梯度离心法,从T-S-Z系统的SRSV/3T3,L783V/3T3,L615K和A9细胞系的培养上清液及L6565小鼠淋巴细胞白血病组织的无细胞提取液中分离小鼠白血病病毒(MuLV)。
短句来源
     The buoyant density of SRV was determined to be 1.36--1.40g/cm~3 in CsCl density gradient.
     在氯化铯(CsCl)中的浮密度为1.36—1.40g/cm~3。
短句来源
     Results The number of cells was((1.73)±(0.44))×10~(7)/ml by using whole marrow method and ((7.65)±(0.52))×10~(7)/ml by using density gradient centrifugation method at the 10th day cultivation respectively.
     结果骨髓细胞培养至第10d时,全骨髓法收获的细胞数为(1.73±0.44)×107/ml,而梯度离心法收获的细胞数为(7.65±0.52)×107/ml,其差异有统计学意义(P<0.01);
短句来源
     Group C: Sediment of islets was purified with Ficoll-400 ( 25 % ,11 %) density gradient.
     C组胰岛沉淀物依次加入25%及11%的Ficoll-400纯化。
短句来源
     Methods: The plasma ET, NO, thromboxane B2 (TXB2), 6 - keto - Prostaglandin F1α(6 - K - PGF1α), Intercellular Adhesion Molecule - 1(ICAM - 1) were respectively determined by density gradient method, radioimmunoassay and enzyme immunoassay method in 42 patients with SSc.
     方法:选择42例SSc病人,采用放射免疫测定法检测血浆内皮素(ET)、血栓素B_2(TXB_2)、6-酮-前列腺素F_(1α)(6-K-PGF_(1α)),采用Griss方法检测血浆一氧化氮(NO)水平,采用酶联免疫法检测细胞间粘附分子-1(ICAM-1)、p选择素(P-S)。
短句来源
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  density gradient
The ribonucleoproteins were obtained by centrifugation in CsCl density gradient.
      
After sucrose density gradient centrifugation of cell organelles from liver, MDH activity was detected in the mitochondrial and cytosolic fractions from non-starved rats.
      
We confirmed the raft association of synaptotagmin I (syt I) in synaptic vesicles by sucrose density gradient centrifugation, cholesterol depletion, and temperature dependence, and Ca2+ was found to positively regulate this association.
      
Increase in the density gradient in a thermal inhomogeneity through which a shock wave passes
      
In [2], the increase in the density gradient behind a shock wave which decays at the boundary of a weak inhomogeneity was calculated.
      
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This paper summarizes a study made by the writer and his former colleague, Prof. J. E. Cermak, at the Colorado Agricultural and Mechanical College (1). The problem was first considered intuitively. After dpplyinq the conventional dimensional andlysis, the following expression for the rate of evaporation was obtained: (EX)/(ΔC·υe )=f9 ((U'X)/(υe), (ρo-ρm)/(ρo), (gx)/(U'2), X/X'). (7) As either of gravitation and density gradient alone could have little effect on the mechanism of evaporation, the second...

This paper summarizes a study made by the writer and his former colleague, Prof. J. E. Cermak, at the Colorado Agricultural and Mechanical College (1). The problem was first considered intuitively. After dpplyinq the conventional dimensional andlysis, the following expression for the rate of evaporation was obtained: (EX)/(ΔC·υe )=f9 ((U'X)/(υe), (ρo-ρm)/(ρo), (gx)/(U'2), X/X'). (7) As either of gravitation and density gradient alone could have little effect on the mechanism of evaporation, the second and third parameters on the righthand side of Eq. (7) were combined. to form a Richardson Number, so that Eq. (7) was reduced to (Ex)/(ΔC·υe) =f10 (R', Ri, X/X'). (8) Similarly, one obtained U/(Uo) = f11 (Rx', Ri, X/X'). (9) Eqs. (8) and (9) were the basic expressions used in the study of the experimental data. A low-speed wind tunnel (fiq. 1) wds used in conducting the experiments. The evaporating surface consisted of a series of porous porcelain plates placed on top of water containers (figs. 2 and 3). Capillary action kept the pldtes moisted as long as water in each container was in contact with the bottom of the plate. Runs were made both with and without the use of artificial means for hastening the onset of turbulent boundary layers. For edch run, a complete set of data were collected. These included the velocity, relative humidity and temperature of the ambient stream, the rates of evaporation for various lengths of the evaporating surface, and finally the velocity, vapor and tempereture profiles at the end of the experimental surface. The experimental range of x'/x was 0.09 to 30 dnd that of the Richardson number was 0.04 to 5.6.

本文摘要介绍了作者在国外时和雪马克(J·E.Cermak)共同进行的研究工作。首先考虑影响本问题的主要因素,应用量纲分析后获得下列蒸发率的表达式 (Ex)/(ΔC·υe)=f9 ((U’X)/(υe),(ρo-ρm)/(ρo),(gx)/(U’~2),X/X’) (7)因为重力或密度梯度作为一个孤立的因素对于蒸发率是没有什么影响的,因此(7)式中右方的第二及第三两项应予组合以李察生数的形式出现。从而得 N=(EX)/(ΔC·υe)=f10 (R’,Ri,x/x’) (8)同理,得 U’/(Uo)=f11(Rx’,Ri,x/x’) (9) 和试验数字比较后,发觉N仅系R’的函数。这表示在本试验研究的范围内边界层的流态,上风陆地的相对长度以及李察生数对于N都无直接的影响(图9及10)。另一值得注意的结果是按照巴斯魁尔的建议修改刹顿的蒸发理论后,可以获得能够代表实验数字的理论曲线(图9,11,及12)。由此可以推论顿的紊动理论和巴斯魁尔的蒸汽交换系数计算法大体上是正确的。这就为紊动交换蒸发问题的未来分析建立了比较巩固的立足点。

The results of three sets of flume studies given in reference [1] were reanalyzed, indicating that the existence of sediment concentration gradient manifests its effects on the following respects: (1) Within the zone near the bed where a distinct sediment concentration gradient exists, the velocity distribution can be described by the following formula: in which both α' and β are functions of The parameter E is nothing else but an average Richardson number along the vertical. (2) In the main flow zone where...

The results of three sets of flume studies given in reference [1] were reanalyzed, indicating that the existence of sediment concentration gradient manifests its effects on the following respects: (1) Within the zone near the bed where a distinct sediment concentration gradient exists, the velocity distribution can be described by the following formula: in which both α' and β are functions of The parameter E is nothing else but an average Richardson number along the vertical. (2) In the main flow zone where the sediment concentration gradient is small or ceases to exist, the velocity distribution still follows the logarithmic formula, only the von Karman's constant is less than 0.4, the corresponding value of the clear water flow. (3) As a first approximation, the velocity distribution of the whole flow field can be reduced to the following form where η_0=k_s/30.2h and m is a function of E. (4) As part of the turbulent energy is dissipated by overcoming the density gradient, the turbulence level is reduced. In a sediment-laden flow, the distribution of the various aspects of the energy along the vertical is also different from that of the clear water flow. (5) After taking into consideration the effect of density gradient on the flow field and the effect of sediment concentration on the settling velocity of the sedimentary particles, the suspended load distribution along the vertical assumes the following form: logG(S_v, a)=-1/ζF(β',η)+const., the functions G and F are given in graphical forms in Figs. 14 and 15 respectively.

本文根据三组水槽试验资料,初步探讨了近底高含沙量流层对流速分布、紊动特性等的影响,以及在此条件下的含沙量分布规律.近底高含沙量流层的存在,改变了时均流速的分布.在主流区实测范围內,流速分布继续遵循对数定律,但公式中的卡门常数减小,亦即流速分布趋于不均匀.在近底流区內具有明显的密度梯度,其流速分布可用式(13)来描述.挟沙水流中的含沙量梯度有使紊动減弱的作用.在高含沙量条件下,含沙量沿垂线分布具有公式(29)的形式.

Walker 256,the undifferentialed adenoma-carcinoma cells of rat,and the erythrocy-tas of rooster were used for studying of the inducing efficiency of Sandai virus on cell fusion.The relationships between the inducing efficiency of Sandai virus and the allantoic Iluid of chick embryo,the hemagglutin titer unit (HAU) of virus,various dilutions of virus suspension,time of culture of virus in chick embryo,distribution of virus particles in different density gradient fractions,and different virus seeds have...

Walker 256,the undifferentialed adenoma-carcinoma cells of rat,and the erythrocy-tas of rooster were used for studying of the inducing efficiency of Sandai virus on cell fusion.The relationships between the inducing efficiency of Sandai virus and the allantoic Iluid of chick embryo,the hemagglutin titer unit (HAU) of virus,various dilutions of virus suspension,time of culture of virus in chick embryo,distribution of virus particles in different density gradient fractions,and different virus seeds have been investigated.The influence of different cell systems on the inducing efficiency of Sandai virus has also been compared.It has been suggested that the fusion factor presents in the virus particles per se,and not in the allantoic fluid.Prom the standpoint of cell fusion,the progency produced from the same virus seed has been considered to be heterogeneous,one with high inducing efficiency and another with low inducing efficiency.HAU has been shown not to be correlated to the quantities of the virus particles with different inducing efficiency,hence not directly related to the fusion effieiency of the virus.The duration of culture of virus in chick embryo and the quality of virus seed has been observed to influence the fusion efficiency of the virus progency.The dilution of virus suspension and various cell systems has been shown to affect the virus fusion efficiency relatively.

用瓦克(Walker)256-大白鼠未分化腺癌细胞和鸡红血球二种细胞来研究仙苔病毒诱导细胞融合的效力、与鸡胚尿囊液,病毒的血凝单位(HAU),病毒的不同稀释度、病毒在鸡胚中繁殖的时间,分布于不同密度梯度离心带的病毒颗粒,及病毒毒种的关系;并比较了不同细胞系统对仙苔病毒融合效力的影响,提出了融合因子存在于病毒颗粒本身,而不似存在于尿囊液中。文中从细胞融合这一角度,认为同一病毒毒种繁殖出来的子代是不同质的,有高融合效力的和低融合效力的病毒颗粒。HAu不能反映各种不同融合效力病毒颗粒的含量,因而其与融合效力不直接相关。病毒在鸡胚中繁殖的时间及毒种的质量,影响病毒子代的融合效力。病毒的不同稀释度和不同细胞系统影响病毒的融合效力,但这种影响不是绝对的,而是相对。

 
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